TMS37157 datasheet(17/47 Pages) TI

17 / 47 page

TMS37157

www.ti.com

SWRS083A – SEPTEMBER 2009 – REVISED NOVEMBER 2009

TMS37157 COMMANDS

This chapter describes the commands and data that can be transferred to and from the TMS37157 via its contact

less LF interface, SPI and Test interfaces.

When communicating with the transponder following naming conventions are used:

•

Data Transmission from the base station to the transponder is called “write” and “write data are transferred”.

•

Data Transmission from the transponder to the base station is called “read” and “read data re transferred”.

This is applied independently from the command that is executes whether it is a read, write, program or

authentication function.

Write Formats

In order to send commands to the TMS37157 LF interface, the user sends a Write Address byte comprising a

2-bit Command field and a 6-bit Page field. The Command field, which is transmitted first, determines the

function to be executed and whether command comprises additional data bytes that must also be sent. The Page

field specifies the target of the command.

Table 1 shows which additional data bytes must be included with each command type. The elements for each

command are sent from left to the right of this table.

Table 1. Data Bytes for different command types

WRITE ADDRESS

SELECTIVE

FUNCTION

WRITE DATA

FRAME BCC

ADDRESS

COMMAND FIELD

PAGE FIELD

MSB LSB

General read page, battery

check

Selective read page

Program page; MSP access

X(1)

Selective program page

X(1)

Lock page

Selective lock page

Protect page

Selective protect page

(1)

Length of Wrtite Data is 5 bytes for a program page command and 6 bytes for an MSP Access command.

The summary for the available write address via the LF interface are shown in Table 2. It shows the valid

Command and Page field combinations supported by the TMS37157.

Table 2. Valid Command and Page Field Combinations (Command)

WRITE ADDRESS

LSB

MSB

C C

P P P P P P

COMMAND

PAGE FIELD

FIELD

HEX

MSB LSB

VALUE

Page 1

000001

04h

General Read Page 1

000001

05h

Program/Selective Program Page 1

000001

06h

Lock/Selective Lock Page 1

000001

07h

Selective Read Page 1

Page 2

000010

08h

General Read Page 2

000010

09h

Program/Selective Program Page 2

000010

0Ah

Lock/Selective Lock Page 2

000010

0Bh

Selective Read Page 2

Submit Documentation Feedback

Product Folder Link(s): TMS37157

TMS37157 Datasheet(PDF) 17 Page - Texas Instruments

TMS37157 Datasheet(HTML) 17 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47

Datasheet Download

Link URL