M4T28-BR12SH1TR datasheet(5/16 Pages) STMICROELECTRONICS

Part #	M4T28-BR12SH1TR

Description	TIMEKEEPER짰 SNAPHAT짰 (battery and crystal)

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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M4T28-BR12SH, M4T32-BR12SH

Description

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1

Description

The M4TXX-BR12SH SNAPHAT® top is a detachable lithium power source for ST’s non-

volatile TIMEKEEPER® surface-mount SOIC (MH) package (28- and 44-pin).

The SNAPHAT top contains both the battery and crystal and is designed to be “snapped on”

after the SOIC is surface mounted on the PC board. Thus the two piece solution prevents

the battery and crystal from being exposed to the high temperatures of the surface mount

process.

Figure 1.

Logic diagram

Table 1.

Signal names

X1

Crystal input

X2

Crystal output

VBAT–

Negative voltage

VBAT+

Positive voltage

AI02528

SNAPHAT

VBAT–

VBAT+

X1

X2

Similar Part No. - M4T28-BR12SH1TR

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