M41T94 查看數據表（PDF） - STMicroelectronics

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M41T94

Serial Real Time Clock with 44Bytes NVRAM and Reset

STMicroelectronics 

M41T94

Figure 4. Block diagram

E

SDO

SDI

SCL

SPI

INTERFACE

Crystal

WDI

VCC

32KHz

OSCILLATOR

Summary description

REAL TIME CLOCK

CALENDAR

44 BYTES

USER RAM

RTC w/ALARM AF

& CALIBRATION

WATCHDOG

WDF

SQUARE WAVE

IRQ/FT/OUT(1)

SQW

VBAT

RSTIN1

RSTIN2

BL

VBL= 2.5V COMPARE

VSO = 2.5V COMPARE

VPFD = 4.4V COMPARE

(2.65V if THS = VSS)

POR

1. Open drain output

Figure 5. Hardware hookup

RST(1)

AI04785

SPI Interface with D

(CPOL, CPHA)(1) = Q

('0','0') or ('1','1')

C

Master

(ST6, ST7, ST9,

ST10, Others)

CS3 CS2 CS1

CQD

M41T94

E

CQD

XXXXX

E

CQD

XXXXX

E

AI03686

1. CPOL (clock polarity) and CPHA (clock phase) are bits that may be set in the SPI Control register of the MCU.

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