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TMS37157 Datasheet(PDF) 21 Page - Texas Instruments

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Part # TMS37157
Description  PASSIVE LOW FREQUENCY INTERFACE DEVICE WITH EEPROM AND 134.2 kHz TRANSPONDER INTERFACE
PDF  47 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TMS37157 Datasheet(HTML) 21 Page - Texas Instruments

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TMS37157
www.ti.com
SWRS083A – SEPTEMBER 2009 – REVISED NOVEMBER 2009
After a charge phase only, having no write phase, the transponder discharges its capacitor at the end of the
pre-bit phase, which results in no response. If a valid function was detected during the write phase, the complete
read data format is transmitted. The content of the read data format depends on the previously executed
function.
When the last bit has been sent, the capacitor is discharged. During discharge no charge-up is possible.
A sufficiently long read time (tRD) must be provided to ensure that the complete read data format can be
received.
During the response (read) phase, the transponder transmits 96 bits of data, formatted as described below. The
content of the response depends on which page was addressed.
All read data starts with a 16-bit preamble followed by an 8-bit start byte (7Eh), and ends with the 8-bit Read
Address and 16-bit Read Frame BCC. All parts of the read data are transmitted LSB first.
The Read Address byte comprises a 2-bit Status field, which is transmitted first and contains status information,
and a 6-bit Page field, which contains page and additional status information. The contents of the Status field
depend on which page is being addressed.
Table 3. Overview of Read Data Format Content
READ DATA FORMAT BYTE
Page
4
5
6
7
8
9
1
Sel. Address
Page 2
Man. Code
Serial No.
Serial No.
Serial No.
2
Sel. Address
Page 2
Man. Code
Serial No.
Serial No.
Serial No.
3
Sel. Address
Page 2
Man. Code
Serial No.
Serial No.
Serial No.
8
Page 2
Page 8
Page 8
Page 8
Page 8
Page 8
9
Page 2
Page 9
Page 9
Page 9
Page 9
Page 9
10
Page 2
Page 10
Page 10
Page 10
Page 10
Page 10
11
Page 2
Page 11
Page 11
Page 11
Page 11
Page 11
12
Page 2
Page 12
Page 12
Page 12
Page 12
Page 12
13
Page 2
Page 13
Page 13
Page 13
Page 13
Page 13
14
Page 2
Page 14
Page 14
Page 14
Page 14
Page 14
15
Page 2
Page 15
Page 14
Page 14
Page 14
Page 14
19
Battery level
‘00000000’
‘00000000’
‘00000000’
‘00000000’
‘00000000’
31
MSP Data
MSP Data
MSP Data
MSP Data
MSP Data
MSP Data
40
Page 2
Page 40
Page 40
Page 40
Page 40
Page 40
41
Page 2
Page 41
Page 41
Page 41
Page 41
Page 41
42
Page 2
Page 42
Page 42
Page 42
Page 42
Page 42
43
Page 2
Page 43
Page 43
Page 43
Page 43
Page 43
44
Page 2
Page 44
Page 44
Page 44
Page 44
Page 44
45
Page 2
Page 45
Page 45
Page 45
Page 45
Page 45
46
Page 2
Page 46
Page 46
Page 46
Page 46
Page 46
47
Page 2
Page 47
Page 47
Page 47
Page 47
Page 47
48
Page 2
Page 48
Page 48
Page 48
Page 48
Page 48
49
Page 2
Page 49
Page 49
Page 49
Page 49
Page 49
50
Page 2
Page 50
Page 50
Page 50
Page 50
Page 50
51
Page 2
Page 51
Page 51
Page 51
Page 51
Page 51
52
Page 2
Page 52
Page 52
Page 52
Page 52
Page 52
53
Page 2
Page 53
Page 53
Page 53
Page 53
Page 53
54
Page 2
Page 54
Page 54
Page 54
Page 54
Page 54
55
Page 2
Page 55
Page 55
Page 55
Page 55
Page 55
Copyright © 2009, Texas Instruments Incorporated
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