STM818L/M STMicroelectronics, STM818L/M Datasheet - Page 19

• Manufacturer Part Number: STM818L/M
• Description: 5V Supervisor
• Manufacturer: STMicroelectronics

Specifications of STM818L/M

• Operating Temperature: –40 °C to +85 °C (industrial grade)

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