AN1012 datasheet(18/33 Pages) STMICROELECTRONICS

18 / 33 page

TIMEKEEPER products

AN1012

18/33

Doc ID 6395 Rev 4

If data retention lifetimes greater than those shown are required, the user is advised to

choose the version of the device in a SNAPHAT® package. Then, as the battery starts to

reach the end of its useful life, it is possible to remove the SNAPHAT top containing the

nearly expended cell and replace it with a fresh SNAPHAT top. No data will be lost during

the process, provided that the board remains powered up during the operation (although

some time will be lost due to the momentary removal of the 32 kHz crystal). Table 4 shows

which SNAPHAT top part numbers are available.

Table 4.

SNAPHAT part numbers

Part Number

Description

Package

M4Z28-BR00SH

Li Battery (48mAh) for ZEROPOWER products and SUPERVISORS

SNAPHAT

M4Z32-BR00SH

Li Battery (120mAh) for ZEROPOWER products and SUPERVISORS

SNAPHAT

M4T28-BR12SH

Li Battery (48mAh) for TIMEKEEPER products and SUPERVISORS

SNAPHAT

M4T32-BR12SH

Li Battery (120mAh) for TIMEKEEPER products and SUPERVISORS

SNAPHAT

AN1012 Datasheet(PDF) 18 Page - STMicroelectronics