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STM690A Datasheet(PDF) 19 Page - STMicroelectronics

Part # STM690A
Description  5 V supervisor with battery switchover
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM690A Datasheet(HTML) 19 Page - STMicroelectronics

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STM690A/692A/703/704/802/805/817/818/819
Operation
Doc ID 10522 Rev 10
19/43
2.12
Battery freshness seal (STM817/818/819)
The battery freshness seal disconnects the backup battery from internal circuitry and VOUT
until it is needed. This allows an OEM to ensure that the backup battery connected to VBAT
will be fresh when the final product is put to use. To enable the freshness seal:
1.
Connect a battery to VBAT
2.
Ground PFO
3.
Bring VCC above the reset threshold and hold it there until reset is deasserted following
the reset timeout period and
4.
Bring VCC down again (Figure 16)
Use the same procedure for the STM818, but ground ECON instead of PFO. Once the
battery freshness seal is enabled (disconnecting the backup battery from internal circuitry
and anything connected to VOUT), it remains enabled until VCC is brought above VRST.
Figure 15.
Using a SuperCap™
Figure 16.
Freshness seal enable waveform
AI08805
STMXXX
VBAT
VCC
VOUT
5V
GND
RST
To external SRAM
To µP
AI08806
RST
PFO
(STM817/819)
VCC
VRST
ECON
(STM818)
trec
(Externally held at 0V)
(Externally held at 0V)
ECON out state latched
at 1/2 trec, Freshness
Seal enabled
PFO out state latched
at 1/2 trec, Freshness
Seal Enabled


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