CYPRESS CYWUSB6935 User Manual

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CYWUSB6935

WirelessUSB™ LR 2.4-GHz DSSS Radio SoC

1.0 Features

• 2.4-GHz radio transceiver

• Operates in the unlicensed Industrial, Scientific, and Medical (ISM) band (2.4 GHz–2.483 GHz)

• –95-dBm receive sensitivity

• Up to 0dBm output power

• Range of up to 50 meters or more

• Data throughput of up to 62.5 kbits/sec

• Highly integrated low cost, minimal number of external components required

• Dual DSSS reconfigurable baseband correlators

• SPI microcontroller interface (up to 2-MHz data rate)

• 13-MHz input clock operation

• Low standby current < 1 µA

• Integrated 32-bit Manufacturing ID

• Operating voltage from 2.7V to 3.6V

• Operating temperature from –40° to 85°C

• Offered in a small footprint 48 QFN

2.0 Functional Description

The CYWUSB6935 transce iver is a single-chi p 2.4-GHz Direct Sequence Spread Spectrum (DSSS) Gaussian Frequency Shift Keying (GFSK) baseband modem radio that connects directly to a microcontroller via a simple serial peripheral interface.

The CYWUSB6935 is offered in an industrial temperature range 48-pin QFN and a commercial temperature range 48pin QFN.

3.0 Applications

• Building/Home Automation —Climate Control

—Lighting Control —Smart Appliances —On-Site Paging Systems —Alarm and Security

• Industrial Control —Inventory Managem ent

—Factory Automation —Data Acquisition

• Automatic Meter Reading (AMR)

• Transportation —Diagnostics

—Remote Keyless Entry

•Consumer / PC —Locator Alarms

—Presenter Tools —Remote Controls —Toys

DIOVAL

DIO

GFSK

Modulator

GFSK

Demodulator

RFOUT

RFIN

IRQ

SCK MISO MOSI

RESET

Digital

SERDES

X13

X13IN

DSSS

Baseband

DSSS

Baseband

Synthesizer

X13OUT

Figure 3-1. CYWUSB6935 Simplified Block Diagram

Cypress Semiconductor Corporation • 3901 North First Street • San Jose, CA 95134 • 408-943-2600

Document 38-16008 Rev. *A Revised October 28, 2004

CYWUSB6935

3.1 Applications Support

The CYWUSB6935 is supported by both the CY3632 WirelessUSB Developmen t Kit and th e CY3635 W ireles sUSB N:1 Development Kit. The CY3635 development kit provides all of the materials and documents needed to cut the cord on multipoint to poin t and point-to-p oint low ban dwidth, high node density applications including four small form-factor sensor boards and a hub board th at conn ect s to Wi reless USB LR RF module boards, a software app lication that gra phically demo nstrates the multipoint to point protocol, comprehensive WirelessUSB protocol code examples and all of the associated schematics, gerber files and bill of materials. The WirelessUSB N:1 Development Kit is also supported by the WirelessUSB Listener Tool.

4.0 Functional Overview

The CYWUSB6935 provides a complete SPI-to-a ntenna radio modem. The CYWUSB6935 is designed to implement wireless devices operating in the worldwide 2.4-GHz Industrial, Scientific, and Medical (ISM) frequen cy ba nd (2 .40 0G Hz

- 2.4835GHz). It is in tended for sys tems com pliant with worl dwide regulations covered by ETSI EN 301 489-1 V1.4 .1, ETSI EN 300 328-1 V1.3.1 (Europ ean Countries); FCC CFR 47 Part 15 (USA and Industry Canada) and ARIB STD-T66 (Japan).

The CYWUSB6935 contains a 2.4-GHz radio transceiver, a GFSK modem, and a dual DSSS reconfigurable baseband. The radio and baseband are both code- and frequency-agile. Forty-nine spreading codes selected for optimal performance (Gold codes) are supported across 78 1-MHz channels yielding a theoretical spectral capacity of 3822 channels. The CYWUSB6935 supports a range of up to 50 meters or more.

4.1 2.4-GHz Radio

The receiver and transmitter are a single-conversion, lowIntermediate Frequency (low-IF) architecture with fully integrated IF channel matched filters to achieve high performance in the presence of interference. An integrated Power Amplifier (P A) provide s an output power control range of 30 dB in seven steps.

Table 4-1. Internal PA Output Power Step Table

P A Setting T ypical Output Power (dBm)

70 6–2.4 5–5.6 4–9.7 3–16.4 2–20.8 1–24.8 0–29.0

Both the receiver and transmitter integrated Voltage Controlled Oscillator (VCO) and synthes izer have the ag ility to cover the complete 2.4-GHz GFSK radio transmitter ISM band. The synthesizer provides the frequency-hopping local oscillator for the transmitter and receiver. The VCO loop filter is also integrated on-chip.

4.2 GFSK Modem

The transmitter uses a DSP-based vector modulator to convert the 1-MHz chips to an accurate GFSK carrier.

The receiver uses a fully integrated Frequency Modulat or (FM) detector with automatic data slicer to demodulate the GFSK signal.

4.3 Dual DSSS Baseband

Data is converted to DSSS chips by a digital spreader. Despreading is performed by an oversampled correlator. The DSSS baseband cancels spurious noise and assembles properly correlated data bytes.

The DSSS baseban d h as th ree ope rati ng modes: 64 chips /b it Single Channel, 32 chips/bit Single Channel, and 32 chips/bit Single Channel Dual Data Rate (DDR).

4.3.1 64 chips/bit Single Chan nel

The baseband supports a single data stream operating at

15.625 kbits/sec. The advantage of selecting this mode is its ability to tolerate a noisy environment. This is because the

15.625 kbits/sec data stream utilizes the longest PN Code resulting in the high es t p r oba bil ity for recovering packe t s ov er the air. This mode can also be selected for systems requiring data transmissi ons over lon ger ranges.

4.3.2 32 chips/bit Single Chan nel

The baseband supports a single data stream operating at

31.25 kbits/sec.

4.3.3 32 chips/bit Single Channel Dual Data Rate (DDR)

The baseband spread s bits in p airs and s upports a si ngle data stream operating at 62.5 kbits/sec.

4.4 Serializer/Deserializer (SERDES)

CYWUSB6935 provides a data Serializer/Deserializer (SERDES), which provides byte-level framing of transmit and receive data. Bytes for transmission are loaded into the SERDES and receive bytes are read from the SERDES via the SPI interface. The SERDES provides double buffering of transmit and receive dat a. While on e byte is bein g transmitted by the radio the next byte can be written to the SERDES data register insuring there are no breaks in transmitted data.

After a receive byte has been received it is loaded into the SERDES data register and can be read at any time until the

byte is received, at which time the old contents of the

next SERDES data register wil l be overwritten.

4.5 Application Interfaces

CYWUSB6935 has a fu lly sy nchronous SPI slave interface f or connectivity to the application MCU. Configuration and byteoriented data transfer can be performe d over this interface. An interrupt is provided to trigger real time events.

An optional SERDES Bypas s mode (DIO) is provided for a pplications that require a synchronous serial bit-oriented data path. This interface is for data only.

Document 38-16008 Rev. *A Page 2 of 32

CYWUSB6935

4.6 Clocking and Power Management

A 13-MHz crystal is directly connected to X13IN and X13 without the need for external capacitors. The CYWUSB6935 has a progr ammable tr im capabil ity for ad justing t he on-ch ip load capacitance supplied to the crystal. The Radio Frequency (RF) circuitry has on-chip decoupling capacitors. The CYWUSB6935 is powere d from a 2.7V to 3 .6V DC supply. The CYWUSB6935 can be sh utdown to a fully static state u sing the

pin.

PD Below are the requirements for the crystal to be directly

connected to X13IN and X13:

• Nominal Frequency: 13 MHz

• Operating Mode: Fundamen tal Mode

• Resonance Mode: Paralle l Reson ant

• Frequency Stability:

• Series Resistance: ≤ 100 ohms

• Load Capacitance: 10 pF

• Drive Level: 10uW–100 uW

± 30 ppm

4.7 Receive Signal Strength Indicator (RSSI)

The RSSI register (Reg 0x22) returns the relative signal strength of the ON-channel signal power and can be used to:

1. Determine the connection quality

2. Determine the value of the noise floor

3. Check for a quiet channel before transmitting.

The internal RSSI voltage is sampled through a 5-bit analogto-digital converter (ADC). A state machine controls the conversion process. Under normal conditions, the RSSI state machine initia tes a c onv ersion when an ON-ch ann el ca rrie r i s detected and remains abov e the noise floor for over 50uS. The conversion produces a 5-bit value in the RSSI register (Reg 0x22, bits 4:0) along with a valid bit, RSSI register (Reg 0x22, bit 5). The state machine then remains in HALT mode and does not reset for a new conversion until the receive mode is toggled off and on. Once a connection has been established, the RSSI register can be read to determine the relative connection quality of the channel . A RSSI register value lower than 10 indicates that the received signal strength is low, a value greater than 28 indicates a strong signal level.

To check for a quiet channel before transmitting, first set up receive mode properl y and read the RSSI register (Reg 0 x22). If the valid bit is zero, then force the Carrier Detect register (Reg 0x2F, bit 7=1) to initiate an ADC conversion. Then, wait greater than 50uS and read the RSSI register again. Next, clear the Carrier Detect Register (Reg 0x2F, bit 7=0) and turn the receiver OFF. Measuring the noise floor of a quiet channel is inherently a 'noisy' process so, for best results, this procedure should be repeated several times (~20) to compute an average no ise floor level. A RSSI re gister value of 0-10 indicates a channel that is relatively quiet. A RSSI register value greater than 10 indicates the channel is probably being used. A RSSI register value greater than 28 indicates the presence of a strong signal.

5.0 Application Interfaces

5.1 SPI Interface

The CYWUSB6935 has a four-wire SPI communication interface between an a ppl ic ation MCU and one or more sl av e devices. The SPI interface s upports single-byte an d multi- byte serial transfers. The four-wire SPI communications interface consists of Master Out-Slave In (MOSI), Master In-Slave Out (MISO), Serial Clock (SCK), and Slave Select (SS

The SPI receives SCK from an application MCU on the SCK pin. Data from the application MCU is shifted in on the MOSI pin. Data to the application MCU is shifted out on the MISO pin. The active-low Slave Selec t (SS) initiate a SPI transfer.

The application MCU can initiate a SPI data transfer via a multi-byte transact ion. T he first byt e is the Command/Add ress byte, and the following bytes are the data bytes as shown in Figure 5-1 through Figure 5-4. The SS deasserted between bytes. The SPI communications is as follows:

• Command Direction (bit 7) = “0 ” Enabl es SPI read transaction. A “1” enables SPI write transactions.

• Command Increment (b it 6) = “1” Enables SPI aut o address increment. When se t, the addres s field automa tically i ncrements at the en d of each data byte in a bur s t access, ot herwise the same address is accessed.

• Six bits of address.

• Eight bits of data.

The SPI communications interface has a burst mechanism, where the command byte can be followed by as many data bytes as desired. A burst transaction is terminated by deasserting the slave select (SS tions, the application MCU must abide by the timing shown in Figure 12-2.

The SPI communications i nter fac e s ing le re ad a nd b urs t rea d sequences are shown in Figure 5-2 and Figure 5-3 , respectively.

The SPI communication s interfac e single write and burs t write sequences are shown in Figure 5-4 and Figure 5-5 , respectively.

pin must be asserted to

signal should not be

= 1). For burst read transac-

Document 38-16008 Rev. *A Page 3 of 32

CYWUSB6935

Byte 1 Byte 1+N

Bit # 7 6 [5:0] [7:0]

Bit Name DIR INC Address Data

Figure 5-1. SPI Transaction Format

SCK

addrcm d

A0A1A2A3A4A5

MOSI

DIR INC

data to mcu

MISO

D6D7

D0D1D2D3D4D5

Figure 5-2. SPI Single Read Sequence

SCK

MOSI

MISO

DIR INC

addrcm d

A0A1A2A3A4A5

da ta to mcu

D6D7

D0D1D2D3D4D5

data to mcu

D6D7

1+N

D0D1D2D3D4D5

SCK

MOSI

MISO

SCK

MOSI

MISO

DIR INC

Figure 5-3. SPI Burst Read Sequence

addrcmd

D6D7

A0A1A2A3A4A5

data fro m mcu

Figure 5-4. SPI Single Write Sequence

addrcm d

da ta fro m mcu

D6D7

A0A1A2A3A4A5

D0D1D2D3D4D5

data from mcu

D0D1D2D3D4D5

D6D7

1+N

D0D1D2D3D4D5

Figure 5-5. SPI Burst Write Sequence

Document 38-16008 Rev. *A Page 4 of 32

CYWUSB6935

5.2 DIO Interface

The DIO communications interface is an optional SERDES bypass data-only transfer interface. In receive mode, DIO and DIOVAL are valid after the falling edge of IRQ, which clocks

IRQ

DIOVAL

v7v6v5v4v3v2

v9v8v1v0

data to mcu

DIO

d1d0

d7d6d5d4d3d2

Figure 5-6. DIO Receive Sequence

IRQ

DIOVAL

v1v0

v9v8

v7v6v5v4v3v2

data from mcu

DIO

d1d0

d7d6d5d4d3d2

Figure 5-7. DIO Transmit Sequence

the data as shown in

Figure 5-6. In transmit mode, DIO and

DIOVAL are sampled on the falling edge of the IRQ, which clocks the data as shown in

Figure 5-7. The application MCU

samples the DIO and DIOVAL on the rising edge of IRQ.

v...v14v1 3v12v11v10

d...d14d13d12d11d1 0d9d8

v...v1 4v13v12v11v10

d...d1 4d13d12d11d10d9d8

5.3 Interrupts

The CYWUSB6935 features thre e se t s o f interrup t s: trans mi t, received, and a wake interrupt. These interrupts all share a single pin (IRQ), but can be independently enabled/disabled. In transmit mode, all receive interrupts are automatically disabled, and in receive mode all transmit interrupts are automatically disabled. However, the contents of the enable registers are preserve d when swit ching between tran smit an d receive modes.

Interrupts are ena bled and the st atus read thr ough 6 registers: Receive Interrupt Enable (Reg 0x07), Recei ve Interrupt S t atus (Reg 0x08), Transmit Interrupt Enable (Reg 0x0D), Transmit Interrupt Status (Reg 0x0E), Wake Enable (Reg 0x1C), Wake Status (Reg 0x1D).

If more than 1 interrupt is enabled at any time, it is necessary to read the relevant interrupt st atus register to determine which event caused the IRQ pin to assert. Even when a given interrupt source is disabled, the status of the condition that would otherwise cause an interrupt can be determined by reading the appropriate int errupt st atus regis ter. It is therefore possible to use th e devic es with out mak ing us e of the I RQ pin at all. Firmware can poll the interrupt status register(s) to wait for an event, rather than using the IRQ pin.

The polarity of all interrupt s can be s et by writing to the Co nfiguration register (Reg 0x05), and it is possible to configure the IRQ pin to be o pen drain (if a ctive low) o r open source (if active high).

5.3.1 Wake Interrupt

When the PD pin is low, the oscillator is stopped. After PD is deasserted, the oscillator takes time to start, and until it has done so, it is not safe to use the SPI interface. The wake

interrupt indicates that the oscillator has started, and that the device is ready to receive SPI transfers.

The wake interrupt is enabled by setting bit 0 of the Wake Enable register (Reg 0x1C, bit 0=1). Whether or not a wake interrupt is pendin g is indicated by the state of bit 0 of the Wake Status register (Reg 0x1D, bit 0). Reading the Wake Status register (Reg 0x1D) clears the interrupt.

5.3.2 T ran sm it Inte rrupts

Four interrupts a re p rov id ed t o fl ag the oc cu rren ce of t rans m it events. The interrupts are enabled by writing to the Transmit Interrupt Enable register (Reg 0x0D), and their status may be determined by reading the Transmit Interrupt Status register (Reg 0x0E). If more than 1 interrupt i s enabled , it is neces sary to read the Transmit Interrupt Status register (Reg 0x0E) to determine which event caused the IRQ pin to assert.

The function and operatio n of these interrupts are des cribed in detail in

Section 7.0.

5.3.3 Receive Interrupts

Eight interrupts are provided to flag the occurrence of receive events, four each fo r SERDES A and B. In 64 c hips /bit and 3 2 chips/bit DDR modes, only the SERDES A interrupts are available, and the SERDES B interrupts will never trigger, even if enabled. The interrupts are enabled by writing to the Receive Interrupt Enab le regis ter (Reg 0x 07), and their st atu s may be determin ed by reading the Rece ive Interrupt Status register (Reg 0x08 ). If m ore th an on e int errup t i s en abl ed, it i s necessary to read the Receive Interrupt Status register (Reg 0x08) to determine whic h e ven t ca us ed th e IRQ pin to as se rt.

The function and operatio n of these interrupts are des cribed in detail in

Section 7.0.

Document 38-16008 Rev. *A Page 5 of 32

CYWUSB6935

6.0 Application Examples

Figure 6-1 shows a block di agram example of a typ ical battery

powered device using the CYWUSB6935 chip.

Battery

Application

Hardware

LDO/

DC2DC

PSoC

8-bit MCU

Figure 6-1. CYWUSB6935 Battery Powered Device

Vcc





3.3 V

RESET

IRQ

SPI

Figure 6-2 shows an application example of a WirelessUSB

LR alarm system where a single hub node is connected to an alarm panel. The hub node wirelessly receives information from multiple sensor nodes in order to control the alarm panel.

2.0 pF

PCB Tr ace

Wig g l e Antenna

1.2 pF

27 pF

Vcc

RFOUT

Wir elessUSB LR

RFIN

0.1µF

2.0 pF

13M Hz Crystal

3.3 nH

2.2 nH

ALARM PANEL

W irelessUSB LR +

PSoC

W irelessUSB LR

W irelessUSB LR PSoC + KEYPAD

Figure 6-2. WirelessUSB LR Alarm Syste m

PSoC + SMOKE

DETECTOR

PSoC + MOTION

DETECTOR

PSoC + DOOR

SENSOR

…

Document 38-16008 Rev. *A Page 6 of 32

CYWUSB6935

7.0 Register Descriptions

Table 7-1 displays the list of registers inside the

CYWUSB6935 that are addressable through the SPI interfac e. All registers are read and writable, except where noted.

Table 7-1. CYWUSB6935 Register Map

Revision ID REG_ID 0x00 9 0x07 RO Reserved RESERVED 0x01 8 0x00 RW Reserved RESERVED 0x02 8 0x00 RW Control REG_CONTROL 0x03 9 0x00 RW Data Rate REG_DATA_RATE 0x04 10 0x00 RW Configuration REG_CONFIG 0x05 11 0x01 RW SERDES Control REG_SERDES_CTL 0x06 11 0x03 RW Receive SERDES Interrupt Enable REG_RX_INT_EN 0x07 12 0x00 RW Receive SERDES Interrupt Status REG_RX_INT_STAT 0x08 13 0x00 RO Receive SERDES Data A REG_RX_DATA_A 0x09 14 0x00 RO Receive SERDES Valid A REG_RX_VALID_A 0x0A 14 0x00 RO Receive SERDES Data B REG_RX_DATA_B 0x0B 14 0x00 RO Receive SERDES Valid B REG_RX_VALID_B 0x0C 14 0x00 RO Transmit SERDES Interrupt Enable REG_TX_INT_EN 0x0D 15 0x00 RW Transmit SERDES Interrupt Status REG_TX_INT_STAT 0x0E 15 0x00 RO Transmit SERDES Data REG_TX_DATA 0x0F 16 0x00 RW Transmit SERDES Valid REG_TX_VALID 0x10 16 0x00 RW PN Code REG_PN_CODE 0x18–0x11 16 Threshold Low REG_THRESHOLD_L 0x19 17 0x08 RW Threshold High REG_THRESHOLD_H 0x1A 17 0x38 RW Wake Enable REG_WAKE_EN 0x1C 18 0x00 RW Wake Status REG_WAKE_STAT 0x1D 18 0x01 RO Analog Control REG_ANALOG_CTL 0x20 18 0x04 RW Channel REG_CHANNEL 0x21 19 0x00 RW Receive Signal Strength Indicator REG_RSSI 0x22 19 0x00 RO Power Control REG_PA 0x23 19 0x0 0 RW Crystal Adjust REG_CRYSTAL_ADJ 0x24 20 0x00 RW VCO Calibration REG_VCO_CAL 0x26 20 0x00 RW Reg Power Control REG_PWR_CTL 0x2E 21 0x00 RW Carrier Detect REG_CARRIER_DETECT 0x2F 21 0x00 RW Clock Manual REG_CLOCK_MANUAL 0x32 21 0x00 RW Clock Enable REG_CLOCK_ENABLE 0x33 21 0x00 RW Synthesizer Lock Count REG_SYN_LOCK_CNT 0x38 22 0x64 RW Manufacturing ID REG_MID 0x3C–0x3F 22 – RO

[1]

CYWUSB6935

Address Page Default Access

0x1E8B6A3DE0E9B222

Note:

1. All registers are accessed Little Endian.

Document 38-16008 Rev. *A Page 7 of 32

CYWUSB6935

Addr: 0x00 REG_ID Default: 0x07

76543210

Silicon ID Product ID

Figure 7-1. Revision ID Register

Bit Name Description 7:4 Silicon ID These are the Silicon ID revision bits. 0000 = Rev A, 0001 = Rev B, etc. These bits are read-only. 3:0 Product ID These are the Product ID revision bits. Fixed at value 0111. These bits are read-only.

Addr: 0x01 RESERVED Default: 0x00

76543210

Reserved

Figure 7-2. Reserved

Bit Name Description

7:0 Reserved These bits are reserved and should be written with zeroes.

Addr: 0x02 RESERVED Default: 0x00

76543210

Reserved

Figure 7-3. Reserved

Bit Name Description

7:0 Reserved These bits are reserved and should be written with zeroes.

Document 38-16008 Rev. *A Page 8 of 32

CYWUSB6935

Addr: 0x03 REG_CONTROL Default: 0x00

76543210

Enable

PN Code

Select

Auto Syn

Count Select

Auto Internal PA

Disable

Internal PA

Enable

Reserved Reserved

Figure 7-4. Control

Bit Name Description

7 RX Enable The Receive Enable bit is used to place the IC in receive mode.

6 TX Enable The Transmit Enable bit is used to place the IC in transmit mode.

5 PN Code Select The Ps eudo-Noise Code Select bit selects between the upper or lower half of the 64 chips/bit PN code.

4 Auto Syn Count

Select

3 Auto Internal PA

Disable

2 Internal PA

Enable

1 Reserv ed This bit is reserved and should be written with a one. 0 Reserv ed This bit is reserved and should be written with a zero.

1 = Receive Enabled 0 = Receive Disabled

1 = Transmit Enabled 0 = Transmit Disabled

1 = 32 Most Significant Bits of PN code are used 0 = 32 Least Significant Bits of PN code are used

This bit applies only when the Code Width bit is set to 32 chips/bit PN codes (Reg 0x04, bit 2=1). The Auto Synthesizer Count Select bit is used to select the method of determining the settle ti me of the synthesizer .

The two options are a programmable settle time based on the value in Syn Lock Count register (Reg 0x38), in units of 2us, or by the auto detection of the synthesizer lock.

1 = Synthesizer settle time is based on a count in Syn Lock Count register (Reg 0x38) 0 = Synthesizer settle time is based on the internal synthesizer lock signal

It is recommended that the Auto Syn Count Select bit is set to 1 as that guarantees a consistent settle time for the synthesizer.

The Auto Internal PA Disable bit is used to determine the method of controlling the Internal Power Amplifier. The two options are automatic control by the baseband or by firmware through register writes. For external PA usage, please see the description of the REG_ANALOG_CTL register (Reg 0x20).

1 = Register controlled Internal PA Enable 0 = Auto controlled Internal PA Enable

When this bit is set to 1, the enabled state of the Internal PA is directly controlled by bit Internal PA Enable (Reg 0x03, bit 2). It is recommended that this bit is set to 0, leaving

The Internal PA Enable bit is used to enable or disable the Internal Power Amplifier.

1 = Internal Power Amplifier Enabled 0 = Internal Power Amplifier Disabled

This bit only applies when the Auto Internal P A Disable bit is selected (Reg 0x03, bit 3=1), otherwise this bit is don’t care.

the PA control to the baseband.

Document 38-16008 Rev. *A Page 9 of 32

CYWUSB6935

Addr: 0x04 REG_DATA_RATE Default: 0x00

76543210

Reserved Code Width Data Rate Sample Rate

Figure 7-5. Data Rate

Bit Name Description

7:3 Reserved

[2]

Code Width The Code Width bit is used to select between 32 chips/bit and 64 chips/bit PN codes.

[2]

Data Rate The Data Rate bit allows the user to select Double Data Rate mode of operation which delivers a raw data rate of

[2]

Sample Rate The Sample Rate bit allows the use of the 12x sampling when using 32 chips/bit PN codes and Normal Data Rate.

These bits are reserved and should be written with zeroes.

1 = 32 chips/bit PN codes 0 = 64 chips/bit PN codes

The number of chips/bit used impacts a number of factors such as data throughput, range and robustness to interference. By choosing a 32 chips/bit PN-code, the data throughput can be doubled or even quadrupled (when double data rate is set). A 64 chips/bit PN code offers improved range over its 32 chips/bit counterpart as well as more robustness to interference. By selecting to use a 32 chips/bit PN code a number of other register bits are impacted and need to be addressed. These are PN Code Select (Reg 0x03, bit 5), Data Rate (Reg 0x04, bit 1), and Sample Rate (Reg 0x04, bit 0).

62.5kbits/sec. 1 = Double Data Rate - 2 bits per PN code (No odd bit transmissions)

0 = Normal Data Rate - 1 bit per PN code

This bit is applicable only when using 32 chips/bit PN codes which can be selected by setting the Code Width bit (Reg 0x04, bit 2=1). When using Double Data Rate, the raw data throughput is 62.5 kbits/sec because every 32 chips/bit PN code is interpreted as 2 bits of data. When using this mode a single 64 chips/bit PN code is placed in the PN code register. This 64 chips/bit PN code is then split into two and used by the baseband to offer the Double Data Rate capability. enables the user to potentially correlate data using two differing 32 chips/bit PN codes.

Using 12x oversampling improves the correlators receive sensitivity. When using 64 chips/bit PN codes or Double Data Rate this bit is don’t care. The only time when 12x oversampling can be selected is when a 32 chips/bit PN code is being used with Normal Data Rate.

When using Normal Data Rate, the raw data throughput is 32kbits/sec. Additionally, Normal Data Rate

1 = 12x Oversampling 0 = 6x Oversampling

Note:

2. The following Reg 0x04, bits 2:0 values are no t valid:

• 001–Not Valid

• 010–Not Valid

• 011–Not Valid

• 111–Not Valid

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CYWUSB6935

Addr: 0x05 REG_CONFIG Default: 0x01

76543210

Reserved IRQ Pin Select

Figure 7-6. Configurat ion

Bit Name Description

7:2 Reserved These bits are reserved and should be written with zeroes. 1:0 IRQ Pin Select The Interrupt Request Pin Select bits are used to determine the drive method of the IRQ pin.

11 = Open Source (IRQ asserted = 1, IRQ deasserted = Hi-Z) 10 = Open Drain (IRQ asserted = 0, IRQ deasserted = Hi-Z) 01 = CMOS (IRQ asserted = 1, IRQ deasserted = 0) 00 = CMOS Inverted (IRQ asserted = 0, IRQ deasserted = 1)

Addr: 0x06 REG_SERDES_CTL Default: 0x03

76543210

Reserved SERDES

Enable

EOF Length

Figure 7-7. SERDES Control

Bit Name Descripti on

7:4 Reserved These bits are reserved and should be written with zeroes. 3 SERDES Enable The SERDES Enable bit is used to switch between bit-serial mode and SERDES mode.

2:0 EOF Length The End of Frame Length bits are used to set the number of sequential bit times for an inter-frame gap without

1 = SERDES enabled 0 = SERDES disabled, bit-serial mode enabled

When the SERDES is enabled data can be written to and read from the IC one byte at a time, through the use of the SERDES Data registers. The bit-serial mode requires bits to be written one bit at a time through the use of the DIO/DIOVAL pins, refer to section 3.2. It is recommended that SERDES mode be used to avoid the need to manage the timing required by the bit-serial mode.

valid data before an EOF event will be generated. When in receive mode and a valid bit has been received the EOF event can then be identified by the number of bit times that expire without correlating any new data. The EOF event causes data to be moved to the proper SERDES Data Register and can also be used to generate interrupts. If 0 is the EOF length, an EOF condition will occur at the first invalid bit after a valid reception.

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CYWUSB6935

Addr: 0x07 REG_RX_INT_EN Default: 0x00

76543210

Underflow B Overflow B EOF B Full B Underflow A Overflow A EOF A Full A

Figure 7-8. Receive SERDES Interrupt Enable

Bit Name Description

7 Underflow B The Underflow B bit is used to enable the interrupt associated with an underflow condition with the Receive SERDES

6 Overflow B The Overflow B bit is used to enable the interrupt associated with an overflow condition with the Receive SERDES

5 EOF B The End of Frame B bit is used to enable the interrupt associated with the Channel B Receiver EOF condition.

4 Full B The Full B bit is used to enable the interrupt associated with the Receive SERDES Data B register (Reg 0x0B) having

3 Underflow A The Underflow A bit is used to enable the interrupt associated with an underflow condition with the Receive SERDES

2 Overflow A The Overflow A bit is used to enable the interrupt associated with an overflow condition with the Receive SERDES

1 EOF A The End of Frame A bit is used to enable the interrupt associated with an End of Frame condition with the Channel

0 Full A The Full A bit is used to enable the interrupt associated with the Receive SERDES Data A register (0x09) having

Data B register (Reg 0x0B)

1 = Underflow B interrupt enabled for Receive SERDES Data B 0 = Underflow B interrupt disabled for Receive SERDES Data B

An underflow condition occurs when attempting to read the Receive SERDES Data B register (Reg 0x0B) when it is empty.

Data B register (Reg 0x0B)

1 = Overflow B interrupt enabled for Receive SERDES Data B 0 = Overflow B interrupt disabled for Receive SERDES Data B

An overflow condition occurs when new received data is written into the Receive SERDES Data B register (Reg 0x0B) before the prior data is read out.

1 = EOF B interrupt enabled for Channel B Receiver 0 = EOF B interrupt disabled for Channel B Receiver

The EOF IRQ asserts during an End of Frame condition. End of Frame conditions occur after at least one bit has been detected, and then the number of invalid bits in the frame exceeds the number in the EOF length field. If 0 is the EOF length, and EOF condition will occur at the first invalid bit after a valid reception. This IRQ is cleared by reading the receive status register

data placed in it.

1 = Full B interrupt enabled for Receive SERDES Data B 0 = Full B interrupt disabled for Receive SERDES Data B

A Full B condition occurs when data is transferred from the Channel B Receiver into the Receive SERDES Data B register (Reg 0x0B). This could occur when a complete byte is received or when an EOF event occurs whether or not a complete byte has been received.

Data A register (Reg 0x09)

1 = Underflow A interrupt enabled for Receive SERDES Data A 0 = Underflow A interrupt disabled for Receive SERDES Data A

An underflow condition occurs when attempting to read the Receive SERDES Data A register (Reg 0x09) when it is empty.

Data A register (0x09)

1 = Overflow A interrupt enabled for Receive SERDES Data A 0 = Overflow A interrupt disabled for Receive SERDES Data A

An overflow condition occurs when new receive data is written into the Receive SERDES Data A register (Reg 0x09) before the prior data is read out.

A Receiver.

1 = EOF A interrupt enabled for Channel A Receiver 0 = EOF A interrupt disabled for Channel A Receiver

The EOF IRQ asserts during an End of Frame condition. End of Frame conditions occur after at least one bit has been detected, and then the number of invalid bits in a frame exceeds the number in the EOF length field. If 0 is the EOF length, an EOF condition will occur at the first invalid bit after a valid reception. This IRQ is cleared by reading the receive status register.

data written into it.

1 = Full A interrupt enabled for Receive SERDES Data A 0 = Full A interrupt disabled for Receive SERDES Data A

A Full A condition occurs when data is transferred from the Channel A Receiver into the Receive SERDES Data A register (Reg 0x09). This could occur when a complete byte is received or when an EOF event occurs whether or not a complete byte has been received.

Document 38-16008 Rev. *A Page 12 of 32

CYWUSB6935

Addr: 0x08 REG_RX_INT_STAT Default: 0x00

76543210

Valid B Flow Violation B EOF B Full B Valid A Flow Violation A EOF A Full A

Figure 7-9. Receive SE RDES Interrupt Status

Bit Name Description

7 Valid B The Valid B bit is true when all the bits in the Receive SERDES Data B register (Reg 0x0B) are valid.

1 = All bits are valid for Receive SERDES Data B 0 = Not all bits are valid for Receive SERDES Data B

When data is written into the Receive SERDES Data B register (Reg 0x0B) this bit is set if all of the bits within the byte that has been written are valid. This bit cannot generate an interrupt.

6 Flow Violation B The Flow Violation B bit is used to signal whether an overflow or underflow condition has occurred for the Receive

5 EOF B The End of Frame B bit is used to signal whether an EOF event has occurred on the Channel B receive.

4 Full B The Full B bit is used to signal when the Receive SERDES Data B register (Reg 0x0B) is filled with data.

3 Valid A The Valid A bit is true when all of the bits in the Receive SERDES Data A Register (Reg 0x09) are valid.

2 Flow Violation A The Flow Violation A bit is used to signal whether an overflow or underflow condition has occurred for the Receive

1 EOF A The End of Frame A bit is used to signal whether an EOF event has occurred on the Channel A receive.

0 Full A The Full A bit is used to signal when the Receive SERDES Data A register (Reg 0x09) is filled with data.

SERDES Data B register (Reg 0x0B).

1 = Overflow/underflow interrupt pending for Receive SERDES Data B 0 = No overflow/underflow interrupt pending for Receive SERDES Data B

Overflow conditions occur when the radio loads new data into the Receive SERDES Data B register (Reg 0x0B) before the prior data has been read. Underflow conditions occur when trying to read the Receive SERDES Data B register (Reg 0x0B) when the register is (Reg 0x08)

1 = EOF interrupt pending for Channel B 0 = No EOF interrupt pending for Channel B

An EOF condition occurs for the Channel B Receiver when receive has begun and then the number of bit times specified in the SERDES Control register (Reg 0x06) elapse without any valid bits being received. This bit is cleared by reading the Receive Interrupt Status register (Reg 0x08)

1 = Receive SERDES Data B full interrupt pending 0 = No Receive SERDES Data B full interrupt pending

1 = All bits are valid for Receive SERDES Data A 0 = Not all bits are valid for Receive SERDES Data A

When data is written into the Receive SERDES Data A register (Reg 0x09) this bit is set if all of the bits within the byte that has been written are valid. This bit cannot generate an interrupt.

SERDES Data A register (Reg 0x09).

1 = Overflow/underflow interrupt pending for Receive SERDES Data A 0 = No overflow/underflow interrupt pending for Receive SERDES Data A

Overflow conditions occur when the radio loads new data into the Receive SERDES Data A register (Reg 0x09) before the prior data has been read. Underflow conditions occur when trying to read the Receive SERDES Data A register (Reg 0x09) when the register is empty. This bit is cleared by reading the Receive Interrupt Status register (Reg 0x08)

1 = EOF interrupt pending for Channel A 0 = No EOF interrupt pending for Channel A

An EOF condition occurs for the Channel A Receiver when receive has begun and then the number of bit times specified in the SERDES Control register (0x06) elapse without any valid bits being received. This bit is cleared by reading the Receive Interrupt Status register (Reg 0x08).

1 = Receive SERDES Data A full interrupt pending 0 = No Receive SERDES Data A full interrupt pending

A Full A condition occurs when data is transferred from the Channel A Receiver into the Receive SERDES Data A Register (Reg 0x09). This could occur when a complete byte is received or when an EOF event occurs whether or not a complete byte has been received.

empty . This bit is cleared by reading the Receive Interrupt Status register

[3]

Note:

3. All status bits are set and readable in the registers regardless of IRQ enable status. This allows a polling scheme to be implemented without enabling IRQs. The status bits are affected by TX Enable and RX Enable (Reg 0x03, bits 7:6). For example, the receive status will read 0 if the IC is not in receive mode. These registers are read-only.

Document 38-16008 Rev. *A Page 13 of 32

CYWUSB6935

Addr: 0x09 REG_RX_DATA_A Default: 0x00

76543210

Data

Figure 7-10. Receive SERDES Data A

Bit Name Description

7:0 Data

Received Data for Channel A. The over-the-air received order is bit 0 followed by bit 1, followed by bit 2, followed by bit 3, followed by bit 4, followed by bit 5, followed by bit 6, followed by bit 7. This register is read-only.

Addr: 0x0A REG_RX_VALID_A Default: 0x00

76543210

Valid

Figure 7-11. Receive SERDES Valid A

Bit Name Description

7:0 Valid

These bits indicate which of the bits in the Receive SERDES Data A register (Reg 0x09) are valid. A “1” indicates that the corresponding data bit is valid for Channel A.

If the Valid Data bit is set in the Receive Interrupt Status register (Reg 0x08) all eight bits in the Receive SERDES Data A register (Reg 0x09) are valid. Therefore, it is not necessary to read the Receive SERDES Valid A register (Reg 0x0A). This register is read-only.

Addr: 0x0B RE G _RX_D ATA_B Default: 0x00

76543210

Data

Figure 7-12. Receive SERDES Data B

Bit Name Description

7:0 Data

Received Data for Channel B. The over-the-air received order is bit 0 followed by bit 1, followed by bit 2, followed by bit 3, followed by bit 4, followed by bit 5, followed by bit 6, followed by bit 7. This register is read-only.

Addr: 0x0C REG_RX_VALID_B Default: 0x00

76543210

Valid

Figure 7-13. Receive SERDES Valid B

Bit Name Description

7:0 Valid

These bits indicate which of the bits in the Receive SERDES Data B register (Reg 0x0B) are valid. A “1” indicates that the correspondi ng data bit is valid for Channel B.

If the Valid Data bit is set in the Receive Interrupt St atus register (0x08) all eight bits in the Receive SERDES Data B register (Reg 0x0B) are valid. Therefore, it is not necessary to read the Receive SERDES Valid B register (Reg 0x0C). This register is read-only.

Document 38-16008 Rev. *A Page 14 of 32

CYWUSB6935

Addr: 0x0D REG_TX_INT_EN Default: 0x00

76543210

Reserved Underflow Overflow Done Empty

Figure 7-14. Transmit SERDES Interrupt Enable

Bit Name Description

7:4 Reserved 3 Underflow

2 Overflow

1 Done The Done bit is used to enable the interrupt that signals the end of the transmission of data.

0 Empty The Empty bit is used to enable the interrupt that signals when

These bits are reserved and should be written with zeroes. The Underflow bit is used to enable the interrupt associated with an underflow condition associated with the Transmit

SERDES Data register (Reg 0x0F)

1 = Underflow interrupt enabled 0 = Underflow interrupt disabled

An underflow condition occurs when attempting to transmit while the Transmit SERDES Data register (Reg 0x0F) does not have any data.

The Overflow bit is used to enabled the interrupt associated with an overflow condition with the T ransmit SERDES Data register (0x0F).

1 = Overflow interrupt enabled 0 = Overflow interrupt disabled

An overflow condition occurs when attempting to write new data to before the preceding data has been transferred to the transmit shift register.

1 = Done interrupt enabled 0 = Done interrupt disabled

The Done condition occurs when the Transmit SERDES Data register (Reg 0x0F) has transmitted all of its data and there is no more data for it to transmit.

the Transmit SERDES Data register (Reg 0x0F)

the Transmit SERDES register (Reg 0x0F) is empty.

1 = Empty interrupt enabled 0 = Empty interrupt disabled

The Empty condition occurs when the Transmit SERDES Data register (Reg 0x0F) is loaded into the transmit buffer and it's safe to load the next byte

Addr: 0x0E REG_TX_INT_STAT Default: 0x00

76543210

Reserved Underflow Overflow Done Empty

Figure 7-15. Transmit SERDES Interrupt Status

Bit Name Description

7:4 Reserved These bits are reserved. This register is read-only. 3 Underflow The Underflow bit is used to signal when an underflow condition associated with the Transmit SERDES Data register

2 Overflow The Overflow bit is used to signal when an overflow condition associated with the Transmit SERDES Data register (0x0F)

1 Done The Done bit is used to signal the end of a data transmission.

0 Empty The Empty bit is used to signal when

Note:

4. All status bits are set and readable in the registers regardless of IRQ enable status. This allows a polling scheme to be implemented without enabling IRQs. The status bits are affected by the TX Enable and RX Enable (Reg 0x03, bits 7:6). For example, the transmit status will read 0 if the IC is not in transmit mode. These registers are read-only.

(Reg 0x0F) has occurred.

1 = Underflow Interrupt pending 0 = No Underflow Interrupt pending

This IRQ will assert during an underflow condition to the Transmit SERDES Data register (Reg 0x0F). An underflow occurs when the transmitter is ready to sample transmit data, but there is no data ready in the Transmit SERDES Data register (Reg 0x0F). This will only assert after the transmitter has transmitted at least one bit. This bit is cleared by reading the Transmit Interrupt Status register (Reg 0x0E).

has occurred.

1 = Overflow Interrupt pending 0 = No Overflow Interrupt pending

This IRQ will assert during an overflow condition to the Transmit SERDES Data register (Reg 0x0F). An overflow occurs when the new data is loaded into the Transmit SERDES Data register (Reg 0x0F) before the previous data has been sent. This bit is cleared by reading the Transmit Interrupt Status register (Reg 0x0E).

1 = Done Interrupt pending 0 = No Done Interrupt pending

This IRQ will assert when the data is finished sending a byte of data and there is no more data to be sent. This will only assert after the transmitter has transmitted as least one bit. This bit is cleared by reading the Transmit Interrupt Status register (Reg 0x0E)

the Transmit SERDES Data register (Reg 0x0F) has been emptied.

1 = Empty Interrupt pending 0 = No Empty Interrupt pending

This IRQ will assert when the transmit serdes is empty. When this IRQ is asserted it is ok to write t o the Transmit SERDES Data register (Reg 0x0F). Writing the Transmit SERDES Data register (Reg 0x0F) will clear this IRQ. It will be set when the data is loaded into the transmitter, and it is ok to write new data.

[4]

Document 38-16008 Rev. *A Page 15 of 32

CYWUSB6935

Addr: 0x0F REG_TX_DATA Default: 0x00

76543210

Data

Figure 7-16. Transmit SERDES Data

Bit Name Description

7:0 Data Transmit Data. The over-the-air transmitted order is bit 0 followed by bit 1, followed by bit 2, followed by bit 3, followed by bit

4, followed by bit 5, followed by bit 6, followed by bit 7.

Addr: 0x10 REG_TX_VALID Default: 0x00

76543210

Valid

Figure 7-17. Tr ans mit SER DE S Valid

Bit Name Description

7:0 Valid

[5]

The Valid bits are used to determine which of the bits in the Transmit SERDES Data register (reg 0x0F) are valid.

1 = Valid transmit bit 0 = Invalid transmit bit

Default:

Addr: 0x18-11 REG_PN_CODE

63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32

Address 0x18 Address 0x17 Address 0x16 Address 0x15

0x1E8B6A3DE0E9B222

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Address 0x14 Address 0x13 Address 0x12 Address 0x11

Figure 7-18. PN Code

Bit Name Description

63:0 PN Codes The value inside the 8 byte PN code register is used as the spreading code for DSSS communication. All 8 bytes can

Note:

5. Note: The Valid bit in the Transmit SERDES Valid register (Reg 0x10) is used to mark whether the radio will send data or preamble during that bit time of the data byte. Data is sent LSB first. The SERDES will continue to send data until there are no more VALID bits in the shifter. For example, wri ting 0x0F to the Transmit SERDES Valid register (Reg 0x10) will send half a byte.

be used together for 64 chips/bit PN code communication, or the registers can be split into two sets of 32 chips/bit PN codes and these can be used alone or with each other to accomplish faster data rates. Not any 64 chips/bit value can be used as a PN code as there are certain characteristics that are needed to minimize the possibility of multiple PN codes interfering with each other or the possibility of invalid correlation. The over-the-air order is bit 0 followed by bit 1... followed by bit 62, followed by bit 63.

Document 38-16008 Rev. *A Page 16 of 32

CYWUSB6935

Addr: 0x19 REG_THRESHOLD_L Default: 0x08

76543210

Reserved Threshold Low

Figure 7-19. Threshold Low

Bit Name Description

7 Reserved This bit is reserved and should be written with zero. 6:0 Threshold Low The Threshold Low value is used to determine the number of missed chips allowed when attempting to correlate

a single data bit of value ‘0’. A perfect reception of a data bit of ‘0’ with a 64 chips/bit PN code would result in zero correlation matches, meaning the exact inverse of the PN code has been received. By setting the Threshold Low value to 0x08 for example, up to eight chips can be erroneous while still identifying the value of the received data bit. This value along with the Threshold High value determine the correlator count values for logic ‘1’ and logic ‘0’. The threshold values used determine the sensitivity of the receiver to interference and the dependability of the received data. By allowing a minimal number of erroneous chips the dependability of t he received data increases while the robustness to interference decreases. On the other hand increasing the maximum number of missed chips means reduced data integrity but increased robustness to interference and increased range.

Addr: 0x1A REG_THRESHOLD_H Default: 0x38

76543210

Reserved Threshold High

Figure 7-20. Threshold High

Bit Nam e Description

7 Reserved 6:0 Threshold High

This bit is reserved and should be written with zero. The Threshold High value is used to determine the number of matched chips allowed when attempting to correlate

a single data bit of value ‘1’. A perfect reception of a data bit of ‘1’ with a 64 chips/bit or a 32 chips/bit PN code would result in 64 chips/bit or 32 chips/bit correlation matches, respectively, meaning every bit was received perfectly. By setting the Threshold High value to 0x38 (64-8) for example, up to eight chips can be erroneous while still identifying the value of the received data bit. This value along with the Threshold Low value determine the correlator count values for logic ‘1’ and logic ‘0’. The threshold values used determine the sensitivity of the receiver to interference and the dependability of the received data. By allowing a minimal number of erroneous chips the dependability of the received data increases while the robustness to interference decreases. On the other hand increasing the maximum number of missed chips means reduced data integrity but increased robustness to interference and increased range.

Document 38-16008 Rev. *A Page 17 of 32

CYWUSB6935

Addr: 0x1C REG_WAKE_EN Default: 0x00

76543210

Reserved

Wakeup Enable

Figure 7-21. Wake Enable

Bit Name Description

7:1 Reserved 0 Wakeup Enable Wakeup interrupt enable.

These bits are reserved and should be written with zeroes.

0 = disabled 1 = enabled A wakeup event is triggered when the PD

pin is deasserted and once the IC is ready to receive SPI communications.

Addr: 0x1D REG_WAKE_STAT Default: 0x01

76543210

Reserved

Wakeup Status

Figure 7-22. Wake Status

Bit Name Description

7:1 Reserved 0 Wakeup Status Wakeup status.

These bits are reserved. This register is read-only.

0 = Wake interrupt not pending 1 = Wake interrupt pending

This IRQ will assert when a wakeup condition occurs. This bit is cleared by reading the Wake Status register (Reg 0x1D). This register is read-only.

Addr: 0x20 REG_ANALOG_CTL Default: 0x00

76543210

Reserved

Reg Write

Control

MID Read

Enable

Reserved

Reserved PA Output

Enable

PA Invert Reset

Figure 7-23. Analog Control

Bit Name Description

7 Reserved 6 Reg Write Control Enables write access to Reg 0x2E and Reg 0x2F.

5 MID Read Enable The MID Read Enable bit must be set to read the contents of the Manufacturing ID register (Reg 0x3C-0x3F).

4:3 Reserved These bits are reserved and should be written with zeroes. 2 PA Output Enable The Power Amplifier Output Enable bit is used to enable the PACTL pin for control of an external power amplifier.

1 PA Invert The Power Amplifier Invert bit is used to specify the polarity of

0 Reset The Reset bit is used to generate a self-clearing device reset.

This bit is reserved and should be written with zero.

1 = Enables write access to Reg 0x2E and Reg 0x2F

0 = Reg 0x2E and Reg 0x2F are read-only

Enabling the Manufacturing ID register (Reg 0x3C-0x3F) consumes power. This bit should only be set when reading the contents of the Manufacturing ID register (Reg 0x3C-0x3F).

1 = Enables read of MID registers

0 = Disables read of MID registers

1 = PA Control Output Enabled on PACTL pin 0 = PA Control Output Disabled on PACTL pin

the PACTL signal when the PaOe bit is set high.

PA Output Enable and PA Invert cannot be simultaneously changed.

1 = PACTL active low 0 = PACTL active high

1 = Device Reset. All registers are restored to their default values. 0 = No Device Reset.

Document 38-16008 Rev. *A Page 18 of 32

CYWUSB6935

Addr: 0x21 REG_CHANNEL Default: 0x00

76543210

Reserved Channel

Figure 7-24. Channel

Bit Name Description

7 Reserved This bit is reserved and should be written with zero. 6:0 Channel

The Channel register (Reg 0x21) is used to determine the Synthesizer frequency. A value of 2 corresponds to a communication frequency of 2.402 GHz, while a value of 79 corresponds to a frequency of 2.479GHz. The channels are separated from each other by 1 MHz intervals.

Limit application usage to channels 2-79 to adhere to FCC regulations. FCC regulations require that channels 0 and 1 and any channel greater than 79 be avoided. Use of other channels may be restricted by other regulatory agencies. The application MCU must ensure that this register is modified before transmitting data over the air for the first time.

Addr: 0x22 REG_RSSI Default: 0x00

76543210

Reserved Valid RSSI

Note:

Figure 7-25. Receive Signal Strength Indicator (RSSI)

6. The RSSI will collect a single value each time the part is put into receive mode via Control register (Reg 0x03, bit 7=1). See Section 4.7 for more details.

Bit Name Description

7:6 Reserved 5 V alid The Valid bit indicates whether the RSSI value in bits [4:0] are valid. This register is Read Only.

4:0 RSSI

These bits are reserved. This register is read-only.

1 = RSSI value is valid 0 = RSSI value is invalid

The Receive Strength Signal Indicator (RSSI) value indicates the strength of the received signal. This is a read only value with the higher values indicating stronger received signals meaning more reliable transmissions.

[6]

Addr: 0x23 REG_PA Default: 0x00

76543210

Reserved PA Bias

Figure 7-26. Power Control

Bit Name Description

7:3 Reserved These bits are reserved and should be written with zeroes. 2:0 PA Bias The Power Amplifier Bias (PA Bias) bits are used to set the transmit power of the IC through increasing (values up to 7)

or decreasing (values down to 0) the gain of the on-chip Power Amplifier. The higher the register value the higher the transmit power. By changing the PA Bias value signal strength management functions can be accomplished. For general purpose communication a value of 7 is recommended. See Table 4-1 for typical output power steps based on the PA Bias bit settings.

Document 38-16008 Rev. *A Page 19 of 32

CYWUSB6935

Addr: 0x24 REG_CRYSTAL_ADJ Default: 0x00

76543210

Reserved Clock Output

Disable

Crystal Adjust

Figure 7-27. Crystal Adjust

Bit Name Description

7 Reserved This bit is reserved and should be written with zero. 6 Clock Output Disable The Clock Output Disable bit disables the 13 MHz clock driven on the X13OUT pin.

1 = No 13 MHz clock driven 0 = 13 MHz clock driven externally

If the 13 MHz clock is driven on the X13OUT pin then receive sensitivity will be reduced by -4 dBm on channels 5+13n. By default the 13 MHz clock output pin is enabled. This pin is useful for adjusting the 13 MHz clock, but it interfere with every 13th channel beginning with 2.405GHz channel. Therefore, it is recommended that the 13 MHz clock output pin be disabled when not in use.

5:0 Crystal Adjust The Crystal Adjust value is used to calibrate the on-chip parallel load cap acit ance supplied to the crystal. Each

increment of the Crystal Adjust value typically adds 0.135 pF of parallel load capacitance. The total range is 8.5 pF, starting at 8.65 pF. These numbers do not include PCB parasitics, which can add an additional 1-2 pF.

externally

Addr: 0x26 REG_VCO_CAL Default: 0x00

76543210 VCO Slope Enable Reserved

Figure 7-28. VCO Calibration

Bit Name Description

7:6 VCO Slope Enable

(Write-Only)

5:0 Reserved These bits are reserved and should be written with zeroes.

The Voltage Controlled Oscillator (VCO) Slope Enable bits are used to specify the amount of variance automatically added to the VCO.

11 = -5/+5 VCO adjust. The application MCU must configure this option during initialization 10 = -2/+3 VCO adjust 01 = Reserved 00 = No VCO adjust

These bits are undefined for read operations.

Document 38-16008 Rev. *A Page 20 of 32

CYWUSB6935

Addr: 0x2E REG_PWR_CTL Default: 0x00

76543210

Reg Power

Control

Reserved

Figure 7-29. Reg Power Control

Bit Name Description 7 Reg Power

Control

6:0 Reserved These bits are reserved and should be written with zeroes.

When set, this bit disables unused circuitry and saves radio power. The user must set Reg 0x20, bit 6=1 to enable writes to Reg 0x2E. The application MCU must set this bit during initialization.

Addr: 0x2F REG_CARRIER_DETECT Default: 0x00

76543210

Carrier Detect

Override

Reserved

Figure 7-30. Carrier Detect

Bit Name Description 7 Carrier Detect Override When set, this bit overrides carrier detect. The user must set Reg 0x20, bit 6=1 to enable writes to Reg 0x2F . 6:0 Reserved These bits are reserved and should be written with zeroes.

Addr: 0x32 REG_CLOCK_MANUAL Default: 0x00

76543210

Manual Clock Overrides

Figure 7-31. Clock Manual

Bit Name Description 7:0 Manual Clock Overrides This register must be written with 0x41 after reset for correct operation

Addr: 0x33 REG_CLOCK_ENABLE Default: 0x00

76543210

Manual Clock Enables

Figure 7-32. Clock Enable

Bit Name Description 7:0 Manual Clock Enables This register must be written with 0x41 after reset for correct operation

Document 38-16008 Rev. *A Page 21 of 32

CYWUSB6935

Addr: 0x38 REG_SYN_LOCK_CNT Default: 0x64

76543210

Count

Figure 7-33. Synthesizer Lock Count

Bit Name Description

7:0 Count

Determines the length of delay in 2µs increments for the synthesizer to lock when auto synthesizer is enabled via Control register (0x03, bit 1=0) and not using the PLL lock signal. The default register setting is typically sufficient.

Addr: 0x3C-3F REG_MID

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Address 0x3F Address 0x3E Address 0x3D Address 0x3C

Figure 7-34. Manufacturing ID

Bit Name Description

31:0 Address[31:0] These bits are the Manufacturing ID (MID) for each IC. The contents of these bits cannot be read unless the MID

Read Enable bit (bit 5) is set in the Analog Control register (Reg 0x20). Enabling the Manufacturing ID register (Reg 0x3C-0x3F) consumes power. The MID Read Enable bit in the Analog Control register (Reg 0x20, bit 5) should only be set when reading the contents of the Manufacturing ID register (Reg 0x3C-0x3F). This register is read-only.

Document 38-16008 Rev. *A Page 22 of 32

CYWUSB6935

8.0 Pin Descriptions

Table 8-1. Pin Description Table

Pin QFN Name Type Default Description

Analog RF

46 RFIN Input Input RF Input. Modulated RF signal received.

5 RFOUT Output N/A

Crystal / Power Control

38 X13 Input N/A Crystal Input. (refer to Section 4.6). 35 X13IN Input N/A 26 X13OUT Output/Hi-Z Output 33 PD

14 RESET 34 PACTL I/O Input

SERDES Bypass Mode Communica t ions/Interrupt

20 DIO I/O Input Data Input/Output. SERDES Bypass Mode Data Transmit/Receive. 19 DIOVAL I/O Input 21 IRQ Output /Hi-Z Output

SPI Communications

23 MOSI Input N/A Master-Output-Slave-Input Data. SPI data input pin. 24 MISO Output/Hi-Z Hi-Z 25 SCK Input N/A 22 SS

Power and Ground

6, 9, 16, 28, 29, 32, 41, 42, 44,

45 13 GND GND L

1, 2, 3, 4, 7,

8, 10, 11, 12, 15, 17, 18, 27, 30, 31, 36, 37, 39, 40, 43,

47, 48

Exposed

paddle

Input N/A Active LOW Reset. Device reset.

VCC VCC H

NC N/A N/A

GND GND

Input N/A Power Down. Asserting this input (low), w i ll put the IC i n t he Sus pen d

Input N/A Slave Select Enable. SPI enable.

RF Output. Modulated RF signal to be transmitted.

Crystal Input. (refer to Section 4.6). System Clock. Buffered 13-MHz system clock.

Mode (X13OUT is 0 when PD

P ACTL. External Power Amplifier control. Pull-down or make output.

Data I/O Valid. SERDES Bypass Mode Data Transmit/Receive Valid. IRQ. Interrupt and SERDES Bypass Mode DIOCLK.

Master-Input-Slave-Output Data. SPI data output pin. SPI Input Clock. SPI clock.

= 2.7V to 3.6V.

Ground = 0V.

Must be tied to Ground.

L Must be tied to Ground.

is Low).

Document 38-16008 Rev. *A Page 23 of 32

CYWUSB6935

Top View*

CYWUSB6935

RFIN

484746

RFOUT

7 8

NC V

RESET

GND

* E-PAD BOTTOM SIDE

Figure 8-1. CYWUSB6935, 48 QFN – Top View

VCCV

4538444342

VCCV

CYWUSB6935

48 QFN

1617181920 VCCNCNCDIOVAL

DIO

NCNCNC

212422 IRQ

X13

X13IN

PACTL

NC NC

27 26

X13OUT SCK

MISOSSMOSI

Document 38-16008 Rev. *A Page 24 of 32

CYWUSB6935

9.0 Absolute Maximum Ratings

Storage Temperature..................................–65°C to +150°C

Ambient Temperature with Power Applied..–55°C to +125°C Supply Voltage on V DC Voltage to Logic Inputs DC Voltage applied to

Outputs in High-Z State...........................–0.3V to V

Static Discharge Voltage (Digital) Static Discharge Voltage (RF)

relative to VSS..........–0.3V to +3.9V

[7]

..................–0.3V to V

[8]

...........................>2000V

[8]

.................................... 500V

+0.3V

10.0 Operating Conditions

VCC (Supply Voltage)..........................................2.7V to 3.6V

(Ambient Temperature Under Bias).......-40°C to +85°C

TA (Ambient Temperature Under Bias).........0°C to +70°C

Ground V oltage ........................ ..... ...... ...... ..... ...................0V

(Oscillator or Crystal Frequency).....................13 MHz

OSC

Latch-up Current.....................................+200 mA, –200 mA

11. 0 DC Characteristics (over the operating range)

Parameter Description Conditions Min. Typ.

OH1

OH2

Sleep

IDLE I

STARTUP I TX AVG I RX I TX I

CC (PEAK)

SYNTH SETTLE I

Notes:

7. It is permissible to connect voltages above Vcc to inputs through a series resistor limiting input current to 1 mA. This can’t be done during power down mode. AC timing not guaranteed.

8. Human Body Model (HBM).

9. Industrial temperature operating range.

10. Commercial temperature operating range.

11. It is permissible to connect voltages above Vcc to inputs through a series resistor limiting input current to 1 mA.

12. Typ. values measured with Vcc = 3.0V @ 25°C

13. Average Icc when transmitting a 10-byte packet every 15 minutes using the WirelessUSB N:1 protocol.

Supply Voltage 2.7 3.0 3.6 V Output High Voltage condition 1 At IOH = –100.0 µA VCC–0.1 V Output High Voltage condition 2 At IOH = –2.0 mA 2.4 3.0 V Output Low Voltage At IOL = 2.0 mA 0.0 0.4 V Input High Voltage 2.0 V Input Low Voltage –0.3 0.8 V Input Leakage Current 0 < VIN < V

–1 0.26 +1 µA Pin Input Capac itance (except X13, X13IN, RFIN) 3.5 10 pF Current consumption during power-down mode PD = LOW 0.24 15 µA Current consumption without synthesizer PD = HIGH 3 mA ICC from PD high to oscillator stable. 1.8 mA Average transmitter current consumption

[13]

Current consumption during receive 57.7 mA Current consumption during transmit 69.1 mA Current consumption with Synthesizer on, No

Transmit or Receive

[12]

Max. Unit

[11]

1.4 µA

28.7 mA

[9]

[10]

Document 38-16008 Rev. *A Page 25 of 32

CYWUSB6935

12.0 AC Characteristics

Table 12-1. SPI Interface

[16]

[14]

Parameter Description Min. Typ. Max. Unit

SCK_CYC

SCK_HI (BURST READ)

SCK_HI

SCK_LO

DAT_SU

DAT_HLD

DAT_VAL

SS_SU

SS_HLD

SPI Clock Period 476 ns

[15]

SPI Clock High Time 238 ns SPI Clock High Time 158 ns SPI Clock Low Time 158 ns SPI Input Data Set-up Time 10 ns SPI Input Data Hold Time 97 SPI Output Data Valid Time 77 SPI Slave Select Set-up Time before first positive edge of SCK

[17]

[16] [16]

250 ns

SPI Slave Select Hold Time after last negative edge of SCK 80 ns

SCK_CYC

SCK_HI

SCK_LO

SCK

MOSI

MISO

DAT_SU

SS_SU

data fro m m cu data fro m m cu

DAT_HLD

da ta fr o m m c u

DAT_VAL

data to m cu data to m c u

SS_HLD

174

[16]

data

ns ns

Figure 12-1. SPI Timing Diagram

SCK_CYC

SCK

MISO

SCK_HI

every 8th SCK_HI every 9th SCK_HI every 10th SCK_HI

data to m c u data t o m cu

DAT_VAL

SCK_LO

SCK_HI (BURST READ)

Figure 12-2. SPI Burst Read Every 9th SCK HI Stretch Timing Diagram

Notes:

14. AC values are not guaranteed if voltages on any pin exceed Vcc.

15. This stretch only applies to every 9th SCK HI pulse for SPI Burst Reads only.

16. For F

17. SCK must start low, otherwise the success of SPI transactions are not guaranteed.

= 13 MHz, 3.3v @ 25°C.

OSC

data to mcu

data

Document 38-16008 Rev. *A Page 26 of 32

CYWUSB6935

Table 12-2. DIO Interface

Parameter Description Min. Typ. Max. Unit

Transmit

TX_DIOVAL_SU

TX_DIO_SU

TX_DIOVAL_HLD

TX_DIO_HLD

TX_IRQ_HI

DIOVAL Set-up Time 2.1 µs DIO Set-up Time 2.1 µs DIOVAL Hold Time 0 µs DIO Hold Time 0 µs Minimum IRQ High Time – 32 c hips/bit DDR 8 µs Minimum IRQ High Time – 32 chips/bit 16 µs Minimum IRQ High Time – 64 chips/bit 32 µs

TX_IRQ_LO

Minimum IRQ Low Time – 32 chips/bit DDR 8 µs Minimum IRQ Low Time – 32 chips/bit 16 µs Minimum IRQ Low Time – 64 chips/bit 32 µs

Receive

RX_DIOVAL_VLD

DIOVAL Valid Time – 32 chips/bit DDR –0.01 6.1 µs DIOVAL Valid Time – 32 chips/bit –0.01 8.2 µs DIOVAL Valid Time – 64 chips/bit –0.01 16.1 µs

RX_DIO_VLD

DIO Valid Time – 32 chips/bit DDR –0.01 6.1 µs DIO Valid Time – 32 chips/bit –0.01 8.2 µs DIO Valid Time – 64 chips/bit –0.01 16.1 µs

RX_IRQ_HI

Minimum IRQ High Time – 32 c hips/bit DDR 1 µs Minimum IRQ High Time – 32 chips/bit 1 µs Minimum IRQ High Time – 64 chips/bit 1 µs

RX_IRQ_LO

Minimum IRQ Low Time – 32 chips/bit DDR 8 µs Minimum IRQ Low Time – 32 chips/bit 16 µs Minimum IRQ Low Time – 64 chips/bit 32 µs

IR Q

DIO/

DIOVAL

RX_IRQ_HI

data

RX_IRQ_LO

RX_DIO_VLD

RX_DIOVAL_VLD

data

Figure 12-3. DIO Receive Timing Diagram

IR Q

DIO/

DIOVAL

TX_DIO_SU

TX_DIOVAL_SU

TX_IRQ_HI

TX_IRQ_LO

data data

TX_DIO_HLD

TX_DIOVAL_HLD

Figure 12-4. DIO Transmit Timing Diagram

Document 38-16008 Rev. *A Page 27 of 32

CYWUSB6935

12.1 Radio Parameters

Table 12-3. Radio Parameters

Parameter Description Conditions Min. Typ. Max. Unit

RF Frequency Range

Radio Receiver (T = 25°C, V

= 3.3V, fosc = 13.000 MHz ± 2 ppm, X13OUT off, 64 chips/bit, Threshold Low = 8, Threshold High = 56, BER < 10

[19]

2.400 2.483 GHz

Sensitivity –86 –95 dBm Maximum Received Signal –20 –7 dBm RSSI value for PWR RSSI value for PWR

> -40 dBm 28 - 31

< -95 dBm 0 -10

Interference Performance

Co-channel Interference rejection Carrier-to-Interference (C/I) C = –60 dBm 6 dB Adjacent (1 MHz) channel selectivity C/I 1 MHz C = –60 dBm -5 dB Adjacent (2 MHz) channel selectivity C/I 2 MHz C = –60 dBm –33 dB Adjacent (> Image Adjacent (1 MHz) interferenc e to in-band image frequency , C/I

image

3 MHz) channel selectivity C/I > 3 MHz C = –67 dBm –45 dB

[21]

Frequency Interference, C/I Image C = –67 dBm –35 dB

C = –67 dBm –41 dB

±1 MHz

Out-of-Band Blocking Interference Signal Frequency

30 MHz – 2399 MHz except (FO/N & FO/N±1 MHz) 2498 MHz – 12.75 GHz,

except (FO*N & FO*N±1 MHz)

Intermodulation C = –64 dBm

[18]

C = –67 dBm –22 dBm C = –67 dBm –21 dBm

–32 d Bm

∆f = 5,10 MHz

Spurious Emission

30 MHz – 1 GHz –57 dBm 1 GHz – 12.75 GHz

4.8 GHz – 5.0 GHz –40

Radio Transmitt er (T = 25°C, V

Maximum RF Transmit Power PA = 7 -5 –0.4 dBm RF Power Control Range 28.6 dB RF Power Range Control Step Size seven steps, monotonic 4.1 dB

Frequency Deviation PN Code Pattern 10101010 270 kHz Frequency Deviation PN Code Pattern 11110000 320 kHz

Zero Crossing Error Occupied Bandwidth 100-kHz resolution

Initial Frequency Offset ±50 kHz

In-band Spurious

Second Channel Power (±2 MHz) –45 –30 dBm

Third Channel Power (>3 MH z ) –52 –40 dBm

Non-Harmonically Related Spurs

30 MHz – 12.75 GHz –54 dBm

Harmonic Spurs

Second Harmonic –28 dBm Third Harmonic –25 dBm Fourth and Greater Harmonics –42 dBm

Notes:

18. FO = Tuned Frequency, N = Integer.

19. Subject to regulation.

20. Antenna matching network and antenna will attenuate the output signal at these frequencies to meet regulatory requirements.

21. Image frequency is +4 MHz from desired channel (2 MHz low IF, high side injection).

except (4.8GHz - 5.0GHz) –54 dBm

= 3.3V, fosc = 13.000 MHz ± 2 ppm)

20]

dBm

±75 ns

500 860 kHz

bandwidth, –6 dBc

–3

)

Document 38-16008 Rev. *A Page 28 of 32

CYWUSB6935

12.2 Power Management Timing

Parameter Description Conditions Min. Typ Max. Unit

PDN_X13

SPI_RDY

PWR_RST

RST

PWR_PD

WAKE

SLEEP

WAKE_INT

STABLE

X13OUT

VCC

RESET

Time from PD deassert to X13OUT 2000 µs Time from oscillator stable to start of SPI transactions 1 µs Power On to RESET deasserted Vcc @ 2.7V 1300 µs Minimum RESET asserted pulse width 1 µs Power On to PD deasserted PD deassert to clocks running

[22]

[23]

1300 µs

2000 µs Minimum PD asserted pulse width 10 µs PD assert to low power mode 50 ns PD deassert to IRQ

[24]

assert (wake interrupt)

[25]

2000 µs PD deassert to clock stable to within ±10 ppm 2100 µs

SPI_RDY

RST

PWR_R ST

PDN_X13

PWR_PD

Figure 12-5. Power On Reset/Reset Timing

X13OU T

IRQ

SLEEP

WAKE

WAKE_INT

STABLE

Figure 12-6. Sleep / Wake Timing

Notes:

22. The PD

23. When X13OUT is enabled.

24. Both the polarity and the drive method of the IRQ pin are programmable. See page 11 for more details. Figure 12-6 illustrates default values for the Configuration

25. A wakeup event is triggered when the PD

pin must be asserted at power up to ensure proper crystal startup.

pin is deasserted. Figure 12-6 illustrates a wakeup event configured to trigger an IRQ pin event via the Wake Enable

Document 38-16008 Rev. *A Page 29 of 32

12.3 AC Test Loads and Waveforms for Digital Pins

CYWUSB6935

AC Test Loads

OUTPUT

30 pF

INCLUDING JIG AND SCOPE

Max

Parameter Unit

R1 1071 Ω R2 937 Ω R

500 Ω

1.4 V

3.00 V

OUTPUT

5 pF

INCLUDING JIG AND SCOPE

Typical

GND

Rise time: 1 V/ns

Equivalent to: VENIN EQUIVALENT

OUTPUT

DC Test Load

OUTPUT

ALL INPUT PULSES

90%

10%

THÉ

90%

10%

Fall time: 1 V/ns

Figure 12-7. AC Test Loads and Waveforms for Digital Pins

13.0 Ordering Information

Part Number Radio Package Name Package Type Operating Range

CYWUSB6935-48LFXI Transceiver 48 QFN 48 Quad Flat Package No Leads Lead-Free Industrial CYWUSB6935-48LFXC Transceiver 48 QFN 48 Quad Flat Package No Leads Lead-Free Commercial

Document 38-16008 Rev. *A Page 30 of 32

14.0 Package Description

6.90

7.10

6.70

6.80

TOP VIEW

0.80 DIA.

6.70

6.80

6.90

7.10

1.00 MAX.

0.80 MAX.

0°-12°

SIDE VIEW

0.08

0.05 MAX.

0.20 REF.

0.30-0.45

SEATING PLANE

E-PAD

BOTTOM VIEW

CYWUSB6935

0.23±0.05

0.50

5.45

5.55

PIN1 ID

0.20 R.

0.45

0.42±0.18

(4X)

5.45

5.55

DIMENSIONS IN mm MIN.

REFERENCE JEDEC MO-220

PKG. WEIGHT 0.13 gms

MAX.

E-PAD SIZE PADDLE SIZE

(X, Y MAX.)

5.1 X 5.1

5.3 X 5.3

3.8 X 3.8 4.0 X 4.0

51-85152-*B

Figure 14-1. 48-pin Lead-Free QFN 7 × 7 mm LY48

The recommended dimension of the PCB pad size for the E-PAD underneath the QFN is 209 mils × 209 mils (width x length).

This document is subje ct to cha nge , and may be fo und to contain errors of omis sion or changes in parameters. For fee db ack or technical support reg ardi ng Cypre ss Wi rele ss USB pro duc t s ple as e c ont a ct Cypre ss at ww w.cypress.com. WirelessUSB, PSoC, and enCoRe are trademarks of Cypress Semiconductor. All product and company names mentioned in this document are the trademark s of their respective h olders.

Document 38-16008 Rev. *A Page 31 of 32

© Cypress Semiconductor Corporation, 2004. The informat i on cont ained her ein i s subject to change with out notice. Cy pr ess Semiconducto r Corporation assum es no respo nsibility for the use of any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its

Document History Page

Document Title: CYWUSB6935 WirelessUSB™ LR 2.4-GHz DSSS Radio SoC Document Number: 38-16008

REV. ECN NO. Issue Date

** 207428 See ECN TGE New data sheet

*A 275349 See ECN ZTK Updated REG_DATA_RATE (0x04), 111 - Not Valid

Orig. of

Change Description of Change

Changed AVCC annotation to VCC Removed SOIC package option Corrected Figures 3-1, 6-1, and 6-2 Updated ordering information section Added Table 4-1 Internal PA Output Power Step Table Corrected Figure 14-1 caption Updated Radio Parameters Added commercial temperature operating range in section 10 Updated average transmitter current consumption number

CYWUSB6935

Document 38-16008 Rev. *A Page 32 of 32

CYPRESS CYWUSB6935 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1.0 Features

2.0 Functional Description

3.0 Applications

3.1 Applications Support

4.0 Functional Overview

4.1 2.4-GHz Radio

4.2 GFSK Modem

4.3 Dual DSSS Baseband

4.3.1 64 chips/bit Single Chan nel

4.3.2 32 chips/bit Single Chan nel

4.3.3 32 chips/bit Single Channel Dual Data Rate (DDR)

4.4 Serializer/Deserializer (SERDES)

4.5 Application Interfaces

4.6 Clocking and Power Management

4.7 Receive Signal Strength Indicator (RSSI)

5.0 Application Interfaces

5.1 SPI Interface

5.2 DIO Interface

5.3 Interrupts

5.3.1 Wake Interrupt

5.3.2 T ran sm it Inte rrupts

5.3.3 Receive Interrupts

6.0 Application Examples

7.0 Register Descriptions

8.0 Pin Descriptions

9.0 Absolute Maximum Ratings

10.0 Operating Conditions

11. 0 DC Characteristics (over the operating range)

12.1 Radio Parameters

12.2 Power Management Timing

12.3 AC Test Loads and Waveforms for Digital Pins

13.0 Ordering Information

14.0 Package Description