M41T56(2006) 데이터 시트보기 (PDF) - STMicroelectronics

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M41T56
(Rev.:2006)

Serial real-time clock with 56 bytes NVRAM

STMicroelectronics 

Clock operation

M41T56

Figure 12. Crystal accuracy across temperature

Frequency (ppm)

20

0

–20

–40

–60

–80

–100

–120

–140

–160

–40 –30 –20 –10 0

∆F

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

AI00999b

Figure 13. Clock calibration

NORMAL

POSITIVE

CALIBRATION

NEGATIVE

CALIBRATION

AI00594B

3.2

Note:

3.3

Output driver pin

When the FT Bit is not set, the FT/OUT pin becomes an output driver that reflects the

contents of D7 of the Control Register. In other words, when D6 of location 7 is a '0' and D7

of location 7 is a '0' and then the FT/OUT pin will be driven low.

The FT/OUT pin is open drain which requires an external pull-up resistor.

Initial power-on defaults

Upon initial application of power to the device, the FT Bit will be set to a '0' and the OUT Bit

will be set to a '1.' All other Register bits will initially power-on in a random state.

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