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M41T93 Datasheet(PDF) 2 Page - STMicroelectronics

Part # M41T93
Description  Serial SPI bus RTC with battery switchover
Download  49 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41T93 Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
M41T93
2/49
Contents
1
Summary description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1
SPI signal description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.1.1
Serial data output (SDO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.1.2
Serial data input (SDI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.1.3
Serial clock (SCL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.1.4
Chip enable (E) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1
SPI bus characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.2
READ and WRITE cycles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.3
Data retention and battery switch-over (VSO = VRST) . . . . . . . . . . . . . . . 15
2.4
Power-on reset (trec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3
Clock operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.1
Power-down time-stamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.2
Clock/control register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.3
Real time clock accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.4
Clock calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.4.1
Digital calibration (periodic counter correction) . . . . . . . . . . . . . . . . . . . 20
3.4.2
Analog calibration (programmable load capacitance) . . . . . . . . . . . . . . 22
3.5
Setting the alarm clock registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.6
Optional second programmable alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.7
Watchdog timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.8
8-Bit (countdown) timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.8.1
TI/TP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.8.2
TF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.8.3
TIE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.8.4
TE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.8.5
TD1/0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.9
Square wave output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.10
Battery low warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.11
Century bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32


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