Rainbow Electronics MAX66100 User Manual

General Description

The MAX66100 contains a 64-bit unique identifier (UID) and a 13.56MHz ISO 15693 RF interface in a single chip. The UID is revealed during the inventory process. The MAX66100 supports all ISO 15693-defined data rates, modulation indices, subcarrier modes, the selected state, application family identifier (AFI), and data storage format identifier (DSFID). AFI and DSFID are factory programmed with customer-supplied data.

Applications

Driver Identification (Fleet Application)

Access Control

Asset Tracking

Features

♦ Fully Compliant with ISO 15693 and ISO 18000-3

Mode 1 Standard

♦ 13.56MHz ±7kHz Carrier Frequency

♦ 64-Bit Unique, Factory-Programmed UID

♦ Supports AFI and DSFID Function

♦ Write: 10% or 100% ASK Modulation Using 1/4

(26kbps) or 1/256 (1.6kbps) Pulse-Position Coding

♦ Read: Load Modulation Using Manchester Coding

with 423kHz and 484kHz Subcarrier in Low (6.6kbps) or High (26kbps) Data-Rate Mode

♦ Compatible with Existing ISO 15693 Products on

the Market

♦ Powered Entirely Through the RF Field

♦ Operating Temperature: -25°C to +50°C

MAX66100

ISO 15693-Compliant 64-Bit UID

________________________________________________________________

Maxim Integrated Products

Ordering Information

Typical Operating Circuit

19-5622; Rev 0; 1/11

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Denotes a lead(Pb)-free/RoHS-compliant package.

PART TEMP RANGE PIN-PACKAGE

MAX66100E-000AA+ -25°C to +50°C ISO Card

MAX66100K-000AA+ -25°C to +50°C Key Fob

Mechanical Drawings appear at end of data sheet.

EVALUATION KIT

AVAILABLE

13.56MHz READER

TX_OUT

TRANSMITTER

RX_IN

MAGNETIC COUPLING

ANTENNA

IC LOAD

SWITCHED

LOAD

MAX66100

Detailed Description

The MAX66100 contains a 64-bit unique identifier (UID) and a 13.56MHz ISO 15693 RF interface in a single chip. The UID is accessed through standard ISO 15693 function commands. The data rate can be as high as 26.69kbps. The MAX66100 supports AFI and DSFID. Applications of the MAX66100 include driver identification (fleet application), access control, and asset tracking.

Overview

Figure 1 shows the relationships between the major control and memory sections of the MAX66100. Figure 2 shows the applicable ISO 15693 commands and their purpose. The network function commands allow the master to identify all slaves in its range and to change their state, e.g., to select one for further communication. The protocol for these is described in the

Network Function Commands

section. All data is read and written least significant bit (LSb) first, starting with the least significant byte (LSB).

Parasite Power

As a wireless device, the MAX66100 is not connected to any power source. It gets the energy for operation from the surrounding RF field, which must have a minimum strength as specified in the

Electrical Characteristics

table.

Unique Identification Number (UID)

Each MAX66100 contains a factory-programmed and locked identification number that is 64 bits long (Figure 3). The lower 36 bits are the serial number of the chip. The next 8 bits store the device feature code, which is 01h. Bits 45 to 48 are 0h. The code in bit locations 49 to 56 identifies the chip manufacturer, according to ISO/IEC 7816-6/AM1. This code is 2Bh for Maxim. The code in the upper 8 bits is E0h. The UID is read accessible through the Inventory and Get System Information commands.

MAX66100

ISO 15693-Compliant 64-Bit UID

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(TA= -25°C to +50°C.) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Note 1: System requirement. Note 2: Production tested at 13.56MHz only. Note 3: Guaranteed by simulation; not production tested. Note 4: Measured from the time at which the incident field is present with strength greater than or equal to H

(MIN)

to the time at which the MAX66100’s internal power-on reset signal is deasserted and the device is ready to receive a command frame. Not characterized or production tested; guaranteed by simulation only.

Maximum Incident Magnetic Field Strength ..........141.5dBµA/m

Operating Temperature Range ...........................-25°C to +50°C

Relative Humidity ..............................................(Water Resistant)

Storage Temperature Range ...............................-25°C to +50°C

Figure 1. Block Diagram

RF INTERFACE

Carrier Frequency f

Activation Field Strength (Note 3)

Maximum Field Strength H

Power-Up Time t

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

(Notes 1, 2) 13.553 13.560 13.567 MHz

MIN

MAX

POR

At 25°C, MAX66100E 110.5

At 25°C, MAX66100K 122.0

At 25°C (Note 3) 137.5 dBμA/m

(Notes 3, 4) 1.0 ms

dBμA/m

FRONT-

END

DATA

MODULATION

INTERNAL SUPPLY

VOLTAGE

REGULATOR

ISO 15693

FRAME

FORMATTING

AND

ERROR

DETECTION

UID, AFI, DSFID

MAX66100

ISO 15693-Compliant 64-Bit UID

_______________________________________________________________________________________ 3

COMMAND TYPE:

Figure 2. ISO 15693 Commands Overview

MSb LSb

64 57 56 49 48 45 44 37 36 1

E0h 2Bh 0h FEATURE CODE (01h) 36-BIT IC SERIAL NUMBER

Figure 3. 64-Bit UID

SOF 1 OR MORE DATA BYTES CRC (LSB) CRC (MSB) EOF

TIME

Figure 4. ISO 15693 Frame Format

ISO 15693 Communication

Concept

The communication between the master and the MAX66100 (slave) is based on the exchange of data packets. The master initiates every transaction; only one side (master or slaves) transmits information at any time. Each data packet begins with a start-of-frame (SOF) pattern and ends with an end-of-frame (EOF) pattern. A data packet with at least 3 bytes between SOF and EOF is called a frame (Figure 4). The last 2 bytes of an ISO 15693 frame are an inverted 16-bit CRC of the preceding data generated according to the CRC-16-CCITT polynomial. This CRC is transmitted with the LSB first. For more details on the CRC-16-CCITT, refer to ISO 15693 Part 3, Annex C.

For transmission, the frame information is modulated on a carrier frequency, which is 13.56MHz for ISO 15693. The subsequent paragraphs are a concise description of the required modulation and coding. For full details including graphics of the data coding schemes and

SOF/EOF timing, refer to ISO 15693-2, Sections 7.2,

7.3, and 8.

The path from master to slave uses amplitude modulation (Figure 5); the modulation index can be either in the range of 10% to 30% or 100% (ISO 15693-2, Section 7.1). The standard defines two pulse-position coding schemes that must be supported by a compliant device. Scheme A uses the “1 out of 256” method (Figure 6), where the transmission of 1 byte takes

4.833ms, equivalent to a data rate of 1655bps. The location of a modulation notch during the 4.833ms conveys the value of the byte. Scheme B uses the “1 out of 4” method (Figure 7), where the transmission of 2 bits takes 75.52µs, equivalent to a data rate of 26,484bps. The location of a modulation notch during the 75.52µs conveys the value of the 2 bits. A byte is transmitted as a concatenation of four 2-bit transmissions, with the least significant 2 bits of the byte being transmitted first. The transmission of the SOF pattern takes the same time as transmitting 2 bits in Scheme B. The SOF pattern has two modulation notches, which makes it

NETWORK

FUNCTION COMMANDS

MAX66100

AVAILABLE COMMANDS: DATA FIELD AFFECTED:

INVENTORY STAY QUIET SELECT RESET TO READY

UID, AFI, DSFID, ADMINISTRATIVE DATA UID UID UID

MEMORY FUNCTION

COMMANDS

GET SYSTEM INFORMATION UID, AFI, DSFID, CONSTANTS

MAX66100

distinct from any 2-bit pattern. The position of the second notch tells whether the frame uses the “1 out of 256” or “1 out of 4” coding scheme (Figures 8 and 9, respectively). The transmission of the EOF pattern takes 37.76µs; the EOF is the same for both coding schemes and has one modulation notch (Figure 10).

The path from slave to master uses one or two subcar- riers, as specified by the Subcarrier_flag bit in the request data packet. The standard defines two data rates for the response, low (approximately 6600bps)

and high (approximately 26,500bps). The Data_rate_flag bit in the request data packet specifies the response data rate. The data rate varies slightly depending on the use of one or two subcarriers. The LSb is transmitted first. A compliant device must support both subcarrier modes and data rates.

In the single subcarrier case, the subcarrier frequency is 423.75kHz. One bit is transmitted in 37.76µs (high data rate) or 151µs (low data rate). The modulation is the on/off key. For a logic 0, the subcarrier is on during the first half of the bit transmission time and off for the second half. For a logic 1, the subcarrier is off during the first half of the bit transmission time and on for the second half. See Figure 11 for more details.

In the two subcarrier cases, the subcarrier frequencies are 423.75kHz and 484.28kHz. The bit duration is the same as in the single subcarrier case. The modulation is equivalent to binary FM. For a logic 0, the lower subcarrier is on during the first half of the bit transmission time, switching to the higher subcarrier for the second half. For a logic 1, the higher subcarrier is on during the first half of the bit transmission time, switching to the lower subcarrier for the second half. See Figure 12 for details. The transmission of the SOF pattern takes the same time as transmitting 4 bits (approximately 151µs at a high data rate or approximately 604µs at a low data rate). The SOF is distinct from any 4-bit data sequence. The EOF pattern is equivalent to a SOF being transmitted backwards. The exact duration of the SOF and EOF varies slightly depending on the use of one or two subcarriers (see Figures 13 and 14, respectively).

ISO 15693-Compliant 64-Bit UID

4 _______________________________________________________________________________________

Figure 5. Downlink Modulation (e.g., Approximately 100% Amplitude Modulation)

Figure 6. Downlink Data Coding (Case “1 Out of 256”)

CARRIER

AMPLITUDE

100%

PULSE-

MODULATED

CARRIER

01234 . . . . . 2

~ 9.44μs

~ 18.88μs

....... ........2

2 5

~ 4.833ms

.....

2 5 2

MAX66100

ISO 15693-Compliant 64-Bit UID

_______________________________________________________________________________________ 5

Figure 8. Downlink SOF for “1 Out of 256” Coding (Carrier Not Shown)

Figure 7. Downlink Data Coding (Case “1 Out of 4”) (Carrier Not Shown)

PULSE POSITION “00”

~ 9.44μs ~ 9.44μs

PULSE POSITION “01” (1 = LSb)

~ 28.32μs

PULSE POSITION “10” (0 = LSb)

PULSE POSITION “11”

~ 47.20μs

~ 75.52μs

~ 9.44μs

~ 75.52μs

~ 9.44μs

~ 75.52μs

~ 66.08μs

~ 75.52μs

~ 9.44μs

~ 37.76μs ~ 37.76μs

~ 9.44μs

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