M41ST85 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

M41ST85

3.0/3.3V I²C combination serial RTC, NVRAM supervisor and microprocessor supervisor

STMicroelectronics 

Clock operation

Figure 13. Crystal accuracy across temperature

M41ST85W

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 14. Calibration waveform

NORMAL

POSITIVE

CALIBRATION

NEGATIVE

CALIBRATION

AI00594B

3.4

Setting alarm clock registers

Address locations 0Ah-0Eh contain the alarm settings. The alarm can be configured to go

off at a prescribed time on a specific month, date, hour, minute, or second, or repeat every

year, month, day, hour, minute, or second. It can also be programmed to go off while the

M41ST85W is in the battery back-up to serve as a system wake-up call.

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