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General Description

The MAX66120 combines 1024 bits of user EEPROM, a

64-bit unique identifier (UID), and a 13.56MHz ISO

15693 RF interface in a plastic key fob. The memory is

organized as 16 blocks of 8 bytes plus two more blocks

for data and control registers. Each block has a user-

readable write-cycle counter. Four adjacent user

EEPROM blocks form a memory page (pages 0 to 3).

Memory protection features are write protection and

EPROM emulation, which the user can set for each indi-

vidual memory page. The MAX66120 supports all ISO

15693-defined data rates, modulation indices, subcarri-

er modes, the selected state, application family identifier

(AFI), data storage format identifier (DSFID), and the

Option_flag bit for read operations. Memory write

access is accomplished through standard ISO 15693

memory and control function commands.

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

♦ 1024-Bit User EEPROM with Block Lock Feature,

Write-Cycle Counter, and Optional EPROM-

Emulation Mode

♦ 64-Bit UID

♦ Read and Write (64-Bit Block)

♦ Supports AFI and DSFID Function

♦ 10ms Programming Time

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

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

♦ From Fob: Load Modulation Using Manchester

Coding with 423kHz and 484kHz Subcarrier in Low

(6.6kbps) or High (26kbps) Data-Rate Mode

♦ 200,000 Write/Erase Cycles (Minimum)

♦ 40-Year Data Retention (Minimum)

♦ Compatible with Existing 1Kb ISO 15693 Products

on the Market

♦ Supports the Option_Flag for Read Operations

♦ Powered Entirely Through the RF Field

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

MAX66120

ISO 15693-Compliant 1Kb Memory Fob

________________________________________________________________

Maxim Integrated Products

Ordering Information

IC LOAD

SWITCHED

LOAD

MAGNETIC

COUPLING

ANTENNA

RX_IN

TX_OUT

TRANSMITTER

13.56MHz READER

MAX66120

Typical Operating Circuit

19-5623; Rev 0; 11/10

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

MAX66120K-000AA+ -25°C to +50°C Key Fob

Key Fob Mechanical Drawing appears at end of data sheet.

EVALUATION KIT

AVAILABLE

Summary of content (24 pages)

PAGE 1
9-5623; Rev 0; 11/10 KIT ATION EVALU E L B AVAILA ISO 15693-Compliant 1Kb Memory Fob The MAX66120 combines 1024 bits of user EEPROM, a 64-bit unique identifier (UID), and a 13.56MHz ISO 15693 RF interface in a plastic key fob. The memory is organized as 16 blocks of 8 bytes plus two more blocks for data and control registers. Each block has a userreadable write-cycle counter. Four adjacent user EEPROM blocks form a memory page (pages 0 to 3).
PAGE 2
MAX66120 ISO 15693-Compliant 1Kb Memory Fob ABSOLUTE MAXIMUM RATINGS 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 Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
PAGE 3
ISO 15693-Compliant 1Kb Memory Fob MAX66120 INTERNAL SUPPLY VOLTAGE REGULATOR RF FRONTEND ISO 15693 DATA fc UID MEMORY AND FUNCTION CONTROL FRAME FORMATTING AND ERROR DETECTION REGISTER BLOCK MODULATION USER EEPROM Figure 1.
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MAX66120 ISO 15693-Compliant 1Kb Memory Fob DATA BYTE NUMBER (SEQUENCE LEFT TO RIGHT AS WRITTEN TO OR READ FROM DEVICE) BLOCK NUMBER 0 1 2 3 4 5 6 INTEGRITY BYTES 7 LSB MSB 00h Page 0 User EEPROM R/(W) Write-Cycle Counter 01h Page 0 User EEPROM R/(W) Write-Cycle Counter 02h Page 0 User EEPROM R/(W) Write-Cycle Counter 03h Page 0 User EEPROM R/(W) Write-Cycle Counter 04h Page 1 User EEPROM R/(W) Write-Cycle Counter 05h Page 1 User EEPROM R/(W) Write-Cycle Counter 06h Page 1 Use
PAGE 5
ISO 15693-Compliant 1Kb Memory Fob MAX66120 Table 1.
PAGE 6
MAX66120 ISO 15693-Compliant 1Kb Memory Fob Table 3. Protection Code Assignments for U-Lock, AFI-Lock, DSFID-Lock, S-Lock CODE DESCRIPTION 00000000b (00h) Unlocked (factory default) 10101010b (AAh) Locked (irreversible) All other codes Unlocked SOF 1 OR MORE DATA BYTES CRC (LSB) CRC (MSB) EOF TIME Figure 5. ISO 15693 Frame Format CARRIER AMPLITUDE 100% t Figure 6. Downlink Modulation (e.g.
PAGE 7
ISO 15693-Compliant 1Kb Memory Fob MAX66120 PULSEMODULATED CARRIER ~ 9.44μs ~ 18.88μs 0 1 2 3 4 . . . . . 2 2 5 . . . . . . . . . . . . . . . . . . . . 2 2 2 2 5 5 5 5 2 3 4 5 ~ 4.833ms Figure 7. Downlink Data Coding (Case “1 Out of 256”) The path from master to slave uses amplitude modulation (Figure 6); the modulation index can be either in the range of 10% to 30% or 100% (ISO 15693-2, Section 7.1).
PAGE 8
MAX66120 ISO 15693-Compliant 1Kb Memory Fob PULSE POSITION “00” ~ 9.44μs ~ 9.44μs ~ 75.52μs PULSE POSITION “01” (1 = LSb) ~ 28.32μs ~ 9.44μs ~ 75.52μs PULSE POSITION “10” (0 = LSb) ~ 47.20μs ~ 9.44μs ~ 75.52μs PULSE POSITION “11” ~ 66.08μs ~ 9.44μs ~ 75.52μs Figure 8. Downlink Data Coding (Case “1 Out of 4”) (Carrier Not Shown) ~ 9.44μs ~ 9.44μs ~ 37.76μs ~ 37.76μs Figure 9.
PAGE 9
ISO 15693-Compliant 1Kb Memory Fob ~ 9.44μs MAX66120 ~ 9.44μs ~ 9.44μs ~ 37.76μs ~ 37.76μs Figure 10. Downlink SOF for “1 Out of 4” Coding (Carrier Not Shown) ~ 9.44μs ~ 9.44μs ~ 37.76μs Figure 11. Downlink EOF (Identical for Both Coding Schemes) (Carrier Not Shown) TRANSMITTING A ZERO 423.75kHz, ~ 18.88μs ~ 18.88μs ~ 37.76μs TRANSMITTING A ONE ~ 18.88μs 423.75kHz, ~ 18.88μs ~ 37.76μs Figure 12.
PAGE 10
MAX66120 ISO 15693-Compliant 1Kb Memory Fob 423.75kHz, ~ 18.88μs 484.28kHz, ~ 18.58μs TRANSMITTING A ZERO ~ 37.46μs 484.28kHz, ~ 18.58μs 423.75kHz, ~ 18.88μs TRANSMITTING A ONE ~ 37.46μs Figure 13. Uplink Coding, Two Subcarriers Case (High Data-Rate Timing) 423.75kHz ~ 56.64μs 423.75kHz ~ 56.64μs ~ 37.76μs Figure 14. Uplink SOF, Single Subcarrier Case (High Data-Rate Timing) 484.28kHz 423.75kHz ~ 55.75μs ~ 56.64μs 484.28kHz 423.75kHz ~ 37.46μs Figure 15.
PAGE 11
ISO 15693-Compliant 1Kb Memory Fob Initially, the master has no information whether there are any RF devices in the field of its antenna. The master learns the UIDs of the slaves in its field from the responses to the Inventory command, which does not use the Address_flag and the Select_flag bits. The state transitions are controlled by network function commands. Figure 16 shows details. ISO 15693 defines four states in which a slave can be plus three address modes.
PAGE 12
MAX66120 ISO 15693-Compliant 1Kb Memory Fob RESPONSE LEGEND: ADDRESS MODE LEGEND: RESPONSE TO RESET TO READY RESPONSE TO SELECT NO RESPONSE [N] NONADDRESSED [A] ADDRESSED [S] SELECTED POWER-OFF IN FIELD OUT OF FIELD NOTE 1 OUT OF FIELD OUT OF FIELD READY RESET TO READY [N, A, S] RESET TO READY [A] MATCHING UID SELECT [A] MATCHING UID STAY QUIET [A] MATCHING UID SELECT [A], NONMATCHING UID STAY QUIET [A] MATCHING UID QUIET SELECTED SELECT [A] MATCHING UID NOTE 2 NOTE 3 NOTE 1: THE SLAVE PR
PAGE 13
ISO 15693-Compliant 1Kb Memory Fob BIT 8 (MSb) BIT 7 BIT 6 BIT 5 BIT 4 0 Option_flag Address_flag Select_flag 0 BIT 3 BIT 2 BIT 1 (LSb) Inventory_flag Data_rate_flag Subcarrier_flag (= 0) Request Flags, Inventory_flag Bit Set BIT 8 (MSb) 0 BIT 7 0 BIT 6 Nb_slots_flag BIT 5 AFI_flag Request Flags The command descriptions on the subsequent pages begin with a byte called request flags. The ISO 15693 standard defines two formats for the request flags byte.
PAGE 14
MAX66120 ISO 15693-Compliant 1Kb Memory Fob Request Data for the Inventory Command REQUEST FLAGS COMMAND AFI (NOTE 1) MASK LENGTH MASK PATTERN (NOTE 2) (1 Byte) 01h (1 Byte) (1 Byte) (Up to 8 Bytes) Note 1: The AFI byte is transmitted only if the AFI_flag bit is set to 1. The AFI byte, if transmitted, narrows the range of slaves that qualify for responding to the request. Note 2: The mask pattern is transmitted only if the selection mask length is not 0.
PAGE 15
ISO 15693-Compliant 1Kb Memory Fob REQUEST FLAGS COMMAND UID (1 Byte) 02h (8 Bytes) Request Data for the Select Command* REQUEST FLAGS COMMAND UID (1 Byte) 25h (8 Bytes) *If this command is processed without any error, the slave responds with a response flags byte of 00h. Request Data for the Reset to Ready Command* REQUEST FLAGS COMMAND UID** (1 Byte) 26h (8 Bytes) *If this command is processed without any error, the slave responds with a response flags byte of 00h.
PAGE 16
Table 5. Error Code Matrix Write access failed because block is locked 12h Detailed Command Descriptions Lock DSFID Write DSFID Lock AFI Write AFI Custom Read Block 11h Read Multiple Blocks 10h Already locked Read Single Block Invalid block number Lock Block ERROR CODE ERROR DESCRIPTION Write Single Block FAILING COMMANDS Get System Information MAX66120 ISO 15693-Compliant 1Kb Memory Fob one command-specific parameter, which is the memory block number.
PAGE 17
ISO 15693-Compliant 1Kb Memory Fob REQUEST FLAGS COMMAND UID BLOCK NUMBER (1 Byte) 22h (8 Bytes) (1 Byte) *If this command is processed without any error, the slave responds with a response flags byte of 00h.
PAGE 18
ISO 15693-Compliant 1Kb Memory Fob MAX66120 Request Data for the Read Multiple Blocks Command REQUEST FLAGS COMMAND UID STARTING BLOCK NUMBER NUMBER OF BLOCKS (1 Byte) 23h (8 Bytes) (1 Byte) (1 Byte) Response Data for the Read Multiple Blocks Command (No Error, Option_flag Not Set) RESPONSE FLAGS MEMORY DATA 00h (8 to 24 Bytes) Response Data for the Read Multiple Blocks Command (No Error, Option_flag Set) RESPONSE FLAGS SECURITY STATUS MEMORY DATA 00h (1 Byte) (8 Bytes) Repeated as neede
PAGE 19
ISO 15693-Compliant 1Kb Memory Fob REQUEST FLAGS COMMAND UID AFI VALUE (1 Byte) 27h (8 Bytes) (1 Byte) *If this command is processed without any error, the slave responds with a response flags byte of 00h. Request Data for the Lock AFI Command REQUEST FLAGS COMMAND UID (1 Byte) 28h (8 Bytes) *If this command is processed without any error, the slave responds with a response flags byte of 00h.
PAGE 20
MAX66120 ISO 15693-Compliant 1Kb Memory Fob POLYNOMIAL = X16 + X12 + X5 + 1 MSb 1ST STAGE X0 3RD STAGE 2ND STAGE 4TH STAGE X2 X1 X3 5TH STAGE 6TH STAGE X4 X5 7TH STAGE 8TH STAGE X6 X7 LSb 9TH STAGE X8 10TH STAGE X9 11TH STAGE X10 12TH STAGE X11 13TH STAGE X12 14TH STAGE X13 15TH STAGE X14 16TH STAGE X15 X16 INPUT DATA Figure 17.
PAGE 21
ISO 15693-Compliant 1Kb Memory Fob Master-to-Slave Slave-to-Master Programming ISO 15693 Communication Examples Get System Information SOF RQF GSY [UID] CRC-16 EOF Success (Carrier) SOF RSF = 00h IFLG UID DSFID AFI NBLK MBS ICR CRC-16 EOF Write Single Block SOF RQF WSB [UID] BN BDATA CRC-16 EOF (Carrier) tPROG Success Error SOF RSF = 00h CRC-16 EOF SOF RSF = 01h ERRC CRC-16 EOF Lock Block SOF RQF LBL [UID] BN CRC-16 EOF Success Error (Carrier) tPROG SOF RSF = 00h CRC-16 EOF SOF RSF = 01h
PAGE 22
ISO 15693-Compliant 1Kb Memory Fob MAX66120 ISO 15693 Communication Examples (continued) Read Multiple Blocks SOF RQF RMB [UID] SBN #BLK CRC-16 EOF Success (Option_Flag = 0) Success (Option_Flag = 1) Error (Carrier) SOF RSF = 00h MDATA CRC-16 EOF (1, 2, or 3 blocks) SOF RSF = 00h SECS AND MDATA CRC-16 EOF (1, 2, or 3 blocks) SOF RSF = 01h ERRC CRC-16 EOF Custom Read Block SOF RQF CRB MFG [UID] BN CRC-16 EOF (Carrier) Success SOF RSF = 00h MDATA INTB CRC-16 EOF (Option_Flag = 0) Success SOF
PAGE 23
ISO 15693-Compliant 1Kb Memory Fob Write DSFID SOF RQF WDSF [UID] DSFID CRC-16 EOF (Carrier) tPROG Success Error SOF RSF = 00h CRC-16 EOF SOF RSF = 01h ERRC CRC-16 EOF Lock DSFID SOF RQF LDSF [UID] CRC-16 EOF Success Error (Carrier) tPROG SOF RSF = 00h CRC-16 EOF SOF RSF = 01h ERRC CRC-16 EOF Key Fob Mechanical Drawing TOP VIEW 54mm 7.7mm 28mm MAX66120K-000AA+ 1.
PAGE 24
MAX66120 ISO 15693-Compliant 1Kb Memory Fob Revision History REVISION NUMBER REVISION DATE 0 11/10 DESCRIPTION Initial release PAGES CHANGED — Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.