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M41ST87WMX6TR Arkusz danych(PDF) 2 Page - STMicroelectronics

Numer części M41ST87WMX6TR
Szczegółowy opis  5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41ST87WMX6TR Arkusz danych(HTML) 2 Page - STMicroelectronics

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Contents
M41ST87Y, M41ST87W
2/48
Contents
1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1
Security features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2
Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.1
2-wire bus characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1.1
Bus not busy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1.2
Start data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1.3
Stop data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1.4
Data valid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1.5
Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.2
READ mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.3
WRITE mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.4
Data retention mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.5
Tamper detection circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.6
Tamper register bits (tamper 1 and tamper 2) . . . . . . . . . . . . . . . . . . . . . 17
2.6.1
Tamper enable bits (TEB1 and TEB2) . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.6.2
Tamper bits (TB1 and TB2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.6.3
Tamper interrupt enable bits (TIE1 and TIE2) . . . . . . . . . . . . . . . . . . . . 18
2.6.4
Tamper connect mode bit (TCM1 and TCM2) . . . . . . . . . . . . . . . . . . . . 18
2.6.5
Tamper polarity mode bits (TPM1 and TPM2) . . . . . . . . . . . . . . . . . . . . 18
2.6.6
Tamper detect sampling (TDS1 and TDS2) . . . . . . . . . . . . . . . . . . . . . . 21
2.6.7
Tamper current high/tamper current low (TCHI/TCLO1 and
TCHI/TCLO2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.6.8
RAM clear (CLR1 and CLR2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.6.9
RAM clear external (CLR1EXT and CLR2EXT) . . . . . . . . . . . . . . . . . . . . 21
2.7
Tamper detection operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.8
Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2.9
Internal tamper pull-up/down current . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2.10
Avoiding inadvertent tampers (normally closed configuration) . . . . . . . . . 26
2.11
Tamper event time-stamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3
Clock operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.0.1
Power-down time-stamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28


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