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A8520E24A91 – Users Manual Page 5 of 28 Release Date: Dec 27

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1. Overview

The A8520E24A91 series modules are surface mount modules integrating a CC85xx PurePath™ wireless audio transceiver with the CC2591 PA/LNA device for increased range and an integral antenna. The module incorporates a crystal, the required RF matching and filtering for FCC compliance as well as filtering on all digital lines for noise reduction and sensitivity. The modules operate in the global non-licensed 2.4GHz ISM/SRD frequency band. These radio modules are ideal for achieving low power, lo ng range wireless connectivity withou t having to deal with extensive Protocol, RF, antenna design and regulatory compliance, allowing quick time to market. The modules are 100% tested to provide consistent performance.

The A8520E24A91 series modules have received regulatory approvals for modular devices in the United States (FCC) and Canada (IC). The modular approval allows the end us er to place an A8520E24A91 module inside a finished product without having to perform costly regulatory testing for an intentional RF radiator. Section 3 has information on the requirements for the end user/integrator must fulfill to use the modules without intentional radiator regulatory testing.

The A85xxE91A91 is based on the CC85xx series chips and the CC2591 c hip, both from Texas Instruments. All control lines are provided at module lev el for full control of its operation. Please see the CC85xx and CC2591 data sheet (www.ti.com) for how to o perate, program and control the module. The PurePath™ protocol is developed, by Texas Instruments, specifically for the CC85xx series chips and specifically for digital audio distribution. At the extremes of its range, the protocol provides graceful degradation of the audio s ignal usign algo rithms like interpolation, to make intermittent connectivity inaudible. Thus the A8520E24A91 series modules are not suitable for strict data transport.

The module/protocol is configured and programmed by the OEM/Integ rator to setup the specific Codec chip used for audio conversion and to setup control buttons and manufacturer/network addresses. This is described in detail in the CC85xx datasheet, users guide and PurePath™ documentation on Texas Instruments web (www.ti.com transmit power from the module is covered in section 5.1.

The A8520E24A91 module measures 11x19x2mm and are footprint compatible with other family members:

• A85xxE24A90 – ETSI compliant version similar to the A8520E24A91.

• A85xxR24A00 – Lower power consumption, shorter range modulens.

). Specifics pertaining to calibrating the

Page 6 of 28 A8520E24A91 – Users Manual Release Date: Dec 27

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1.1. Features

Features:

• Un-Compressed Wireless Audio Connectivity

• Pre-defined protocol

• Configurable human interface

• Autonomous or Hosted mode

Benefits Summary:

• Operating temperature -40 to +85C

• 100% RF Tested in production for

repeatable performance

• Common footprint for multiple fami ly members

• No RF engineering experience necessary

• No protocol experience necessary

• Only requires a 2 layer Host PCB

implementation

• FCC & IC certified

• No regulatory “Intentional radiator”

testing required to integrate module into end product. Simple certi f ic at io n labeling replaces testing.

2. Theory of Operation

The A8520E24A91 interfaces directly to a audio Codec chip through the I2S for audio data and though I

2

C fro volume control and other Codec chip settings.

Below a block diagram is given for the A8520E24A91 module.

• Antenna o The antenna couples energy between the air and the module. The integral

antenna provides a near omni-directional antenna pattern with high efficiency; such that the application will work equally well in any direction. Note that the end radiation pattern depend not only on the antenna, but also the ground plane, enclosure and installation environment.

• Filtering o Filtering removes spurious signals to comply with regulatory intentional radiator

requirements as well as provide reduced susceptibility to power supply and digital noise, as well as filter out RF and high frequency noise from the digital audio and control link (I

• Matching o The matching provides the correct loading of the transmit amplifier to achieve the

highest output power as well as the correct loading for the receive LNA to achieve the best sensitivity.

• Protocol

2

S, I2C).

A8520E24A91 – Users Manual Page 7 of 28 Release Date: Dec 27

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o The protocol implements an entire wireless audio transport mechanism with

adaptive frequency usage, retransmission of lost packets as well as a low data rate link for remote control purposes.

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DNC (RF-Test)

GND GND GND GND GND GND

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Figure 1 the functionality of the A852 0E24A91, using an integral antenna

A8520E24A91 – Users Manual Page 9 of 28 Release Date: Dec 27

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2.1. Network Topology and Nomenclature

A A8520E24A91 network consists of one Protocol Master (PM) and one or two Protocol Slave(s) (PS). The PM provides the audio reference clock and controls network association. The PS regenerate the audio reference clock based on the packets received. Audio can be transmitted from the PM to a PS. The device receiving the audio is called an Audio Sink, the device sending the audio is called an Audio Source. A device can be both Audio Sink and Audio Source at the same time (bidirectional audio will be supported in future revisions of the firmware). The CC8520 network also includes a Data Side-Channel which is a bi-directional data link between the PM and all PS in the network. This is further described in chapter 8.

Error! Reference source not found. Illustrates the different network topologies that can be formed with CC8520 using the different firmware versions.

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Figure 2 A8520E24A91 topologies supported for d ifferent A8520E24A91 F W revisions

2.2. Adaptive Frequency Hopping

The purpose of using frequency hopping in a radio system is to provide diversity that allows data throughput to be maintained even if interfering radio systems or the physical environment (e.g. multipath fading) renders some RF channels unusable. In the 2.4 GHz ISM band, the sheer amount of radio systems and the severity and dynamic nature of indoor fading phenomena in typical operating environments require the use of this kind of diversity if a

A8520E24A91 – Users Manual Page 11 of 28 Release Date: Dec 27

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minimum data throughput is to be guaranteed (as audio streaming requires). Frequency hopping systems can either implement a fixed sequence of channel hops or adapt its hopping sequence dynamically to the changing environment it operates in. In order to maximize its ow n chances of delivering audio data in time and to co-exist amicably with other fixed-frequency or adaptive frequency hopping systems, PurePath Wireless uses an adaptive frequency hopping (AFH) scheme that adapts to changing conditions within tens of milliseconds. PurePath Wireless divides the 2.4 GHz band into 18 RF channels with 4 MHz bandwidth. A protocol master, which controls the adaptive frequency hopping scheme for the audio network, maintains a table with an entry for each RF channel and an associated quality-of-service (QoS) estimate for each. Each time an RF channel is used the QoS estimate is updated based on what happens during the timeslot. The frequency hopping algorithm separates the 18 RF channels into two sets:

• A set of 4 active channels

• A set of 14 trial channels

The active channel set contains the preferred RF channels that have proven that they provide sufficiently good quality-of-service. The trial channel set contains the remaining RF channels that are only evaluated occasionally in order to be able to maintain an accurate picture of their quality-of-service. If the QoS estimate of an RF channel in the active set goes beyond a minimum threshold this channel is swapped out with the RF channel in the trial chan nel set that has the best QoS estimate. Other factors play in when selecting a new RF channel to the active channel set, such as trying to maintain a certai n minimum distance in frequency between the different active channels.

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Figure 3 Example of AFH hop seq uence (ac tive se t in c olor, trial set i n black/gray)

The frequency hopping algorithm, when no swaps between the active and trial channel sets occur, goes through a sequence of 70 hops over the course of which every RF channel has been used.

• This 70-hop macrosequence consists of 14 repetitions of a o 5-hop microsequence during which

 Each of the four active RF channels are used once  One of the trial RF channels is used once (cycling through all trial

channels over the course of a macrosequence) Figure 3 illustrates this concept. This gives an average steady-state RF channel usage in an audio network of:

• Each of the four active channels are used 20% of the time

• Each trial channel is used 1.43% of the time

The channels correspond to center frequencies as follows: Channel Center Frequency

[MHz]

Channel Center Frequency

[MHz] 1 2406 10 2442 2 2410 11 2446 3 2414 12 2450 4 2418 13 2454 5 2422 14 2458

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Page 14 of 28 A8520E24A91 – Users Manual Release Date: Dec 27

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3.1.1. FCC Labeling Requirements

The A8520E24A91 modules have been labeled with their own FCC ID number an d if the FCC ID is not visible when the module is installed inside another device, then the outside of the finished product into which the module is installed must also display a label referring to the enclosed module. This exterior label can use wording such as the following:

Contains Transmitter Module FCC ID: X7J-A10051701

-orContains FCC ID: X7J-A10051701 This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any

interference received, including interference that may cause undesired operation.

3.1.2. End User Manual

The end user manual should include the following statement: This equipment has been tested and found to comply with the limits for a C lass B digital devic e,

pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not ins talled and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined b y turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit different from that to which the receiver

is connected.

• Consult the dealer or an experienced radio/TV technician for help.

3.1.3. RF Exposure

All transmitters regulated by FCC must comply with RF exposure requirements. OET Bulletin 65 “Evaluating Compliance with FCC Guidelines for Human Exposure to Radio Frequency

A8520E24A91 – Users Manual Page 15 of 28 Release Date: Dec 27

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Electromagnetic Fields” provides assistance in determining whether proposed or existing transmitting facilities, operations or devices comply with limits for human exposure to Radio Frequency (RF) fields adopted by the Federal Communications Commission (FCC). The bulletin offers guidelines and suggestions for evaluating compliance.

If appropriate, compliance with exposure guidelines for mobile and unlicensed de vices can be accomplished by the use of warning labels and by providing users with information concerning minimum separation distances from transmitting structures and proper installation of antennas.

The following statement must be included as a CAUTION statement in manuals and OEM products to alert users of FCC RF Exposure compliance:

To satisfy FCC RF Exposure requirements for mobile and base station transmission devic es, a separation distance of 20 cm or more should be maintained between the antenna of this device and persons during operation. To ensure compliance, operation at closer than this distance is not recommended. The antenna(s) used for this transmitter must no t be co-located or operating in conjunction with any other antenna or transmitter.

If the A8520E24A91 module is used in a portable application (antenna is less than 20 cm from persons during operation), the integrator/OEM is responsible for performing Specific Absorption Rate (SAR) testing in accordance with FCC rules 2.1093.

3.2. Canada (Industry Canada, IC)

The A8520E24A91 modules has been certified for use in Canada under Indus try Canada (IC) Radio Standards Specification (RSS) RSS-210 and RSS-Gen.

Host devices which contain separately certified modules do not need to be recertified, provided that they meet the following conditions:

a) The host device, as a stand-alone unit without any separately certified modules, complies with all applicable Radio Standards Specifications.

b) The host device and all the separately certified modules it contains jointly meet the RF exposure compliance requirements of RSS-102, if applicable.

c) The host device complies with the certification labeling requirements of each of the modules it contains.

Note: Compliance of a module in its final configuration is the responsibility of the applicant. A host device will not be considered certified if the instructions regarding antenna configuration provided in the original description, of one or more separately certified modules it contains, were not followed.

Page 16 of 28 A8520E24A91 – Users Manual Release Date: Dec 27

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3.2.1. IC Labeling Requirements

From section 3.2.1 RSS-Gen, Issue 3, December 2010, Labeling Requirements for the Host Device:

The host device shall be properly labeled to identify the modules within the host device. The Industry Canada certification label of a module s hall be c learly visible at all times when installed in the host device, otherwise the host device must be labeled to display the Industry Canada certification number of the module, precede d by the words “Contains tra nsmitter module”, or the word “Contains”, or similar wording expressing the same meaning

From section 5.2, RSS-Gen, Issue 3, December 2010, Equipment Certification Numbers and Labels: Every unit of Category I radio apparatus certified for marketing and use in Canada shall bear a permanent label on which is indelibly displayed the model number and Industry Canada certification number of the equipment model (transmitter, receiver, or inseparable combination thereof). Each model shall be identified by a unique combination of a model number and a certification number, which are assigned as described below in this section.

The label shall be securely affixed to a permanently attached part of the device, in a location where it is visible or easily accessible to the user, and shall not be readily detachable. The label shall be sufficiently durable to remain fully legible and intact on the device in all normal conditions of use throughout the device’s expected lifetime. These requirements may be met either by a separate label or nameplate permanently attached to the device or by permanently imprinting or impressing the label directly onto the device.

The label text shall be legible without the aid of magnification, but is not required to be larger than 8-point font size. If the device is too small to meet this condition, the label information may be included in the user manual upon agreement with Industry Canada.

Label: Contains/Contient IC: 8975A- A10051701

Notice: This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired opera tion of the device.

Avis: Cet appareil est conforme avec Industrie Canada RSS standard exempts de licence (s). Son fonctionnement est soumis aux deux conditions suivantes: (1) cet appareil ne peut pas provoquer d'interférences et (2) cet appareil doit accepter toute interférence, y compris les interférences qui peuvent causer un mauvais fonctionnement du dispositif.

For more information see: Industry Canada http://www.ic.gc.ca/

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3.2.2. RF Exposure

All transmitters regulated by IC must comply with RF exposure limits as set forth in RSS-102, Issue 4, section 4, “Exposure Limits”. Furthermore RSS-102, Issue 4, Section 2 “Certification Requirements”, provides assistance in determining the specific requirements for compliance . If appropriate, compliance with exposure guidelines for mobile and unlicensed devices can be accomplished by the use of warning labels and by providing users with information concerning minimum separation distances from transmitting structures and proper installation of antennas.

The following statement must be included as a CAUTION statement in manuals and OEM products to alert users of IC RF Exposure compliance:

Notice: To satisfy IC RF Exposure requirements for mobile and base station transmission devices, a separation distance of 20 cm or more should be maintained between the antenna of this device and persons during operation. To ensure compliance, operation a t closer than this distance is not recommended. The antenna(s) used for thi s transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.

Avis: Pour répondre à la IC d'exposition pour les besoins de base et mobiles dispositifs de transmission de la station, sur une distance de s éparation de 20 cm ou plus doit être maintenue entre l'antenne de cet appareil et les personnes en cours de fonc tionnement. Pour assurer le respect, l'exploitation de plus près à cette distance n'est pas recommandée. L'antenne (s) utilisé pour cet émetteur ne doit pas être co-localisés ou fonctionner conjointement avec une autre antenne ou transmetteur.

If the A8520E24A91 module is used in a portable application (antenna is less than 20 cm from persons during operation), the integrator/OEM is responsible for performing Specific Absorption Rate (SAR) testing in accordance with IC rules and methods of RSS-102.

3.3. Potential Interference Sources

The two main mechanisms that allow a PurePath wireless system to co-exist amicably in close proximity to other 2.4 GHz radio systems are:

• The adaptive frequency hopping scheme described in section 2.4.3 that ensures that RF channels used by other radio systems are avoided

• Adaptive listen-before-talk mechanism that measures energy in RF channel before transmitting and avoids transmitting if the channel is already in use

These mechanisms together ensure that other radio systems are minimally impacted by a PurePath Wireless audio network in normal circumstances. However, since a low-latency audio network by its very nature transports a very time-critical data stream, both mechanisms have adaptive thresholds to ensure that the audio network is given its fair share of RF spectrum in very crowded RF environments.

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4. Electrical Characteristics

4.1. Absolute Maximum Ratings

Under no circumstances must the absolute maximum ratings given in Table 1 be violated. Stress exceeding one or more of the limiting values may cause permanent damage to the device.

Caution!

ESD sensitive device. Precaution should be used when handling the device in order to prevent permanent damage.

A85xxE24A91 – Users Manual Page 19 of 28

A

Release Date: Dec 1

Parameter Min Max Unit Condition/Note Supply Voltage (Vdd) -0.3 3.6 V

st

2010

Voltage on any digital pin -0.3 Vdd+ 0.3,

max 3.6 RF input power 0 dBm Storage Temperature -50 150 ˚C Solder reflow temperature 260 ˚C According to IPC/JEDEC J-

ESD <500 V

ESD 400 V

Table 1 Absolute Maximum Ratings

V

STD-020D

ccording to JEDEC STD 22, method A114, Human body model

ccording to JEDEC STD 22, C101C, Charged Device Model (CDM)

4.2. Operating Conditions

Parameter Min Max Unit Condition/Note Supply Voltage (Vdd) 2.2 3.6 V Supply Voltage IOVdd 1.8 3.6 V Temperature Range -40 +85 ˚C

4.3. Pin Out

The A85xxE24Axx radio’s share a common pin-out and foot print, thus enabling the use of the same application PCB layout for US/Europe and low power (short range) versus higher power (long range). Below the footprint is shown.

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Figure 4 Module pin-out view

A85xxE24A91 – Users Manual Page 21 of 28 Release Date: Dec 1

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Pin Name Pin Type Description

Pin Number

1 GND Common

DNC (RF -

2

Test)

3 GND Common 4 AVdd_CC259x

5 VBAT Analog Input

6 SCL, GIO10 Digital I/O 7 SDA, GI O11 Digital I/O Digital I/O1 I2C master data line. Must be connected to external pull-up, General-purpose 33

8 GIO12 Digital I/O General-purpose digital I/O pin 12 34 9 GIO13 Digital I/O General-purpose digital I/O pin 13 35

10 XPAEN/PAEN Digital Out

11 XLN AEN/EN Digital Out

12 GND Common 13 XANTN Digital I/O Do Not Connect (future antenna diversity control or USB interface) 1 14 XANTP Digital I/O Do Not Connect (future antenna diversity control or USB interface) 2

15 CS_N 16 SCLK Digital I/O Serial SPI configuration interface, clock input/output 4

17 MOSI Digital I/O Serial SPI configuration interface, master data input, slave data output 5 18 MISO, GIO0 Digital I/O 19 GIO1 Digital I/O General-purpose digital I/O pin 1, Configurable with PurePath™ Wireless Configurator 7

20 GIO2 Digital I/O General-purpose digital I/O pin 2 8 21 GIO3 Digital I/O General-purpose digital I/O pin 3, Configurable with PurePath™ Wireless Configurator 9 22 GND Common

23 RSTN 24 MCLK Digital I/O Digital I/O1 Master clock output for external audio devices (GIO4). 13

25 BCLK Digital I/O Digital I/O1 I 2 S/DSP audio interface bit clock (in/out) (GIO5). 14 26 WCLK Digital I/O Digital I/O1 I2S/DSP audio interface word clock (in/out) (GIO6). 15 27 AD0 Digital I/O Digital I/O1 I2S/DSP audio interface data line 0 (in/out) (GIO7). 16 28 AD1 Digital I/O Digital I/O1 I2S/DSP audio interface data line 1 (in/out) (GIO8). 17

29 AD2, GIO9 Digital I/O 30 GND Common

31 HGM Digital Input

32 IOVDD Power (I/O Digital power supply for the digital core, GIO's SPI, I2C and I2S (1.8V to 3.6V) 10 33 AVDD Power Analog power supply connection for the Radio and PA/LNA (2.0V to 3.6V) 20 34 GND Common

Power/Decoup

ling

Digital Input

(Pull-up)

Digital Input

(Pull-up)

Connecting this pin to anything will significantly affect the performance of the module and may

This pin should not be used unless deemed necessary in particular noisy power supply environments, See "power supply consideration" section for more information Battery voltage supervisor (threshold level programmable by external resistor to positive battery terminal) I2C master clock line. Must be connected to external pull-up, General-purpose digital I/O pin 10

The CC85xx asserts this pin high to turn on the CC259x power amplifier for transmit. The pin can be used to detect the radio state to synchronize other system events e.g. to smooth out power consumption or minimize noise injection. A high indicates that the PA is on. At no time will both XPAEN and XLN AEN be high at the same time. The CC85xx asserts this pin high to turn on the CC259x low noise amplifier. The pin can be used to detect the radio state to synchronize other system events e.g. to turn of noise/switching sources for better sensitivity. At no time will both XPAEN a nd XLN AEN be high at the same time.

Serial SPI configuration interface, active low chip select 3

Serial SPI configuration interface, master data output, slave data input GIO0 output when CS_N is deasserted. General-purpose digital I/O pin 0

Active-low device reset 11

Digital I/O2 I2S/DSP audio interface data line 2 (in/out), Configurable with PurePath™ Wireless Configurator

Digital control pin. HGM=1 ? CC259x LNA is in High Gain M ode (~10dB gain), HGM=0 ? CC259x LNA is in Low Gain Mode (~0dB gain). Can be used to avoid overdriving the receiver in case the transmitter is in very close proximity to the receiver, otherwise do not connect.

the end users right, under FCC, to operate the module

void

CC259x Pin

CC85xx Pin

29

32

536

638

6

19

7

Table 2 pin-out table, with references to chip pins

Page 2

2

4

e

m

B

a

A85x

R

–

2

4.

of 28

. R

comme

nded L

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nual

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Figure

5 Recom

ended PC

layout.

A85xxE24A91 – Users Manual Page 23 of 28 Release Date: Dec 1

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Figure 6 Mounting the module in a corner

Figure 7 Mounting the module along an

edge

4.5. Power Supply Considerations

Noise on the power supply line reduces the sensitivity of a receiver and ca n modulate onto a transmitters signal, both of which causes a degradation of link quality and hence a reduction in range.

The A85xxE24Axx radio modules have integral noi se reduction in the supply line from pins 33 (Vdd) and 32 (IOVdd), consisting of ferrite beads and decoupling capacitances. This arrangement will take care of most supply voltage noise. For optimal performance in particular noisy environments (switching regulators, motor controls, etc.) it may be necessary to add additional noise reduction means, which can consist of a low noise LDO or additional LC filtering.

Pin 4 (AVdd_CC259x) is connected to the modules internal supply line after the ferrite bead and decoupling capacitors and can be used to probe the noise at module level. The noise level measured on pin 4 should not exceed 150mVpp when in transmit or receive mode, it may however exceed this value when not in either trans mit or receive mode or in the trans ition itself (i.e. it may exceed this if synchronized to the XPAEN and XLNAEN signals.

If the level measured is exceeding the above limit means should be taken to ensure maximum range:

• Add decoupling capacitance to pin 4 (AVdd_CC259x), 1uF to 2.2µF ceramic capacitor is suggested (do not use Tantalum).

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• Add decoupling capacitance to pin 33 (AVdd), 1uF to 2.2uF ceramic capacitor is suggested (do not use Tantalum).

• Add a low noise LDO in the supply line to pin 33 (AVdd) (the TPS731xx low Dropout Regulator from TI is recommended).

Note that if operated from a battery source there is no need for additional noise reduc tion. Also note that if the noise source can be synchronized to be off whenever the module is transmitting or receiving (using XPAEN and XLNAEN) then that will also suffice.

5. Configuration and Programming

The integrator of this module into an application must program the module to match both the Codec chip used and the human interface methods employed. To do this the integrator must use the PurePath™ software from Texas Instruments to configure the module

5.1. Calibrating Transmit Power

This power calibration number is an approximate power output value in dBm for the CC85xx chip – however the modules CC2591 adds an additional 16dB amplification.

The maximum allowed setting to comply with FCC/IC is “0” (which produces 16dBm output power). Any setting above this voids the end users right to use the equipment.

It can be useful to set a lower power for systems that do not require the full range and thus save on power consumption. The typical power consumption at 3.3v supply for a A8520E24A91 module is shown below depending on the output power setting.

Output

Power

Setting

# [dBm] Master Slave 0 16 48 18

-1 15 43 18

-2 14 39 17

-3 13 38 17

-4 12 34 16

-5 11 33 16

-6 10 32 15

-7 9 32 15

-8 8 30 15

-9 7 28 15

-10 6 27 15

Actual Output

Power

(Approximate)

Current Consumption [mA] @ 3.3V

AVdd,IOVdd, Ambient

In the PurePath

TM

configurator when creating the application image, in the “Radio” page for both master and slave the target Tx power must be set to 0 dBm, or lower, (note that this produces 16dBm peak from the module due to CC2591 PA/LNA):

Master Radio Page

Slave Radio Page

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Target power, set to 0 or lower

Alternatively the power calibration can be done immediately after programming of each module using the SPI host controller interface, using the

CAL_SET_DATA function. This option is useful if

the same image will be used in multiple equipment, of which some have the power turned down further than 0 to save current consumption, however it requires a host processor.

5.2. Programming

The desired application image can be programmed into the module either using the PurePath software and the included CC-Debugger. Or the PurePathTM software can be used to create the desired image, which is saved and the integrator can use an in-house developed production programmer to upload the image.

If developing an in-house programmer there are a few things to consider to successfully program the CC8520 chip. Programming procedure:

// Enter the bootloader

BOOT_RESET(); BL_UNLOCK_SPI();

Check SWR Proceed only if SWR matches required value (Reset device and Restart programming again)

// Erase the flash

BL_FLASH_MASS_ERASE();

TM

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Check SWR Proceed only if SWR matches required value (Reset device and Restart programming again)

// For each flash page

for (int n = 0; n < 31; n++) {

// Write page data to the start of the available RAM area

SET_ADDR(0x6000, sw); WRITE(0x400, data to be programmed into flash page n , sw);

/* While using the image generated by TI- Purepath Wireless Configurator, note that the entire image file generated by PWC-TI is Intel_hex format. For programming 8520 module use only the data and discard additional data/information */ // Program the page

BL_FLASH_PROG_PAGE(RAM_ADDR = 0x6000, FLASH_ADDR = 0x8000+(n*0x400))

Check SWR Proceed only if SWR matches required value wait till the block is completely transfered

}

// Verify the flash contents

BL_FLASH_VERIFY(BYTE_COUNT = value read from the HEX file );

/* The flash verify byte count data is 4 byte value stored from location &h 8010 within the image file */

Check SWR Proceed only if SWR matches required value (Reset device and Restart programming again) SYS_RESET()

// Done, perform SYS_RESET() to start the application

If the status word read fails immediately after execution of BOOT_RESET or BL_UNLOCK_SPI then it is most likely due to the special SPI requirement during these instructions as MISO must go low and then high after the SPI clock sequence as shown in the figure below.

If the SPI bus controller is unable to perform this wait, then use the SPI pins as GPIO’s and manually program the bit sequences as described below for the BOOT_RESET().

Procedure for programming Boot_Reset()

1. Assert CSn Low and then clock the SCL with each negative edge of clock asset the logic level to high or low on MOSI pin.

2. After sending &H B0 00 on MOSI pin. Wait till MISO pin goes high. Note: Status check/update is done between MISO and CSn pin going high. If this time is not sufficient. This will lead to error in SWR read value.

3. One BOOT_RESET is successful then switch to normal SPI operation mode.

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HISTORY

Date Author Change Note No./Notes

Aug 8th 2010 Kirkeby Initial Draft Dec 1st 2010 Kirkeby Initial Release, formatting and content chg.

Dec 13th 2010 Kirkeby Programming and Tx power setting.

Thank you for learning more about the

Anaren Integrated Radio (AIR) module line.

If you have additional questions,

need samples, or would like a quote –

please do not hesitate to email the AIR team

Worldwide North America Worldwide

Anaren Microwave, Inc.

6635 Kirkville Road East Syracuse, NY 13057 Tel: +1 315 432 8909 +1 800 411 6596 Fax: +1 315 432 8970

at [email protected]

or contact any of these

authorized distributors of the AIR product line.

Anaren Microwave (Europe), Inc.

12 Somerset House, Suite 16 & 17 Hussar Court, Waterlooville Hampshire, England P07-7SG Tel: +44 2392 232392 Fax: +44 2392 251369

Anaren Communication Suzhou Co. Ltd.

No. 5 Chun Hui Road Wei Ting, Suzhou Industrial Park Suzhou 215122, PR China Tel: +86 512 6287 6400 Fax: +86 512 6274 9283