M4T28-BR12SH データシートの表示（PDF） - STMicroelectronics

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M4T28-BR12SH

TIMEKEEPER® SNAPHAT® (battery and crystal)

STMicroelectronics 

M4T28-BR12SH, M4T32-BR12SH

3

DC and AC parameters

DC and AC parameters

This section summarizes the operating and measurement conditions, as well as the DC and

AC characteristics of the device. The parameters in the following DC and AC characteristic

tables are derived from tests performed under the measurement conditions listed in the

relevant tables. Designers should check that the operating conditions in their projects match

the measurement conditions when using the quoted parameters.

Table 3. Operating and AC measurement conditions

Parameter

M4T28-BR12SH M4T32-BR12SH

Nominal battery voltage (VCC)

Nominal battery capacity

Battery chemistry

Crystal load capacitance (CL)

Nominal crystal frequency

Crystal accuracy (at 25°C)

2.8

48

Li(CF)

12.5

32.768

± 35

2.8

120

Li(CF)

12.5

32.768

± 35

Unit

V

mAh

pF

kHz

ppm

7/16

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