M41T81 查看數據表（PDF） - STMicroelectronics

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M41T81

Serial access real-time clock with alarm

STMicroelectronics 

M41T81

Clock operation

The IRQ/FT/OUT/SQW pin is an open drain output which requires a pull-up resistor to VCC

for proper operation. A 500-10 k resistor is recommended in order to control the rise time.

The FT bit is cleared on power-down.

Figure 10. Crystal accuracy across temperature

Frequency (ppm)

20

0

–20

–40

–60

–80

–100

–120

–140

–160

–40 –30 –20 –10 0

ΔF

F

=

K

x

(T

–

TO)2

K = –0.036 ppm/°C2 ± 0.006 ppm/°C2

TO = 25°C ± 5°C

10 20 30 40 50 60 70 80

Temperature °C

AI07888

Figure 11. Clock calibration

NORMAL

POSITIVE

CALIBRATION

NEGATIVE

CALIBRATION

AI00594B

Doc ID 7529 Rev 10

15/29

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