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STM703 Datasheet(PDF) 6 Page - STMicroelectronics

Part No. STM703
Description  5V Supervisor with Battery Switchover
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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STM703 Datasheet(HTML) 6 Page - STMicroelectronics

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STM690A/692A/703/704/802/805/817/818/819
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Pin Descriptions
MR. A logic low on /MR asserts the reset output.
Reset remains asserted as long as MR is low and
for trec after MR returns high. This active-low input
has an internal pull-up. It can be driven from a TTL
or CMOS logic line, or shorted to ground with a
switch. Leave open if unused.
WDI. If WDI remains high or low for 1.6sec, the in-
ternal watchdog timer runs out and reset is trig-
gered. The internal watchdog timer clears while
reset is asserted or when WDI sees a rising or fall-
ing edge.
The watchdog function can be disabled by allow-
ing the WDI pin to float.
RST. Pulses low for trec when triggered, and stays
low whenever VCC is below the reset threshold or
when MR is a logic low. It remains low for trec after
either VCC rises above the reset threshold, the
watchdog triggers a reset, or MR goes from low to
high.
RST. Pulses high for trec when triggered, and
stays high whenever VCC is above the reset
threshold or when MR is a logic high. It remains
high for trec after either VCC falls below the reset
threshold, the watchdog triggers a reset, or MR
goes from high to low.
VOUT. When VCC is above the switchover voltage
(VSO), VOUT is connected to VCC through a P-
channel MOSFET switch. When VCC falls below
VSO, VBAT connects to VOUT. Connect to VCC if no
battery is used.
VBAT. When VCC falls below VSO, VOUT switches
from VCC to VBAT. When VCC rises above VSO +
hysteresis, VOUT reconnects to VCC. VBAT may ex-
ceed VCC. Connect to VCC if no battery is used.
E. The input to the chip-enable gating circuit. Con-
nect to ground if unused.
ECON. ECON goes low only when E is low and re-
set is not asserted. If ECON is low when reset is as-
serted, ECON will remain low for 15µs or until E
goes high, whichever occurs first. In the disabled
mode, ECON is pulled up to VOUT.
PFI. When PFI is less than VPFI or when VCC falls
below 2.4V (or VSO), PFO goes low; otherwise,
PFO remains high. Connect to ground if unused.
PFO. When PFI is less than VPFI, or VCC falls be-
low 2.4V (or VSO), PFO goes low; otherwise, PFO
remains high. Leave open if unused.
Table 3. Pin Description
Pin
Name
Function
STM818
STM690A
STM692A
STM802
STM817
STM703
STM704
STM819
STM805
––6–
MR
Push-button Reset Input
66–6
WDI
Watchdog Input
777–
RST
Active-Low Reset Output
–––7
RST
Active-High Reset Output
1111
VOUT
Supply Output for External LPSRAM
2222
VCC
Supply Voltage
8888
VBAT
Backup-Battery Input
4–––
E
Chip Enable Input
5–––
ECON
Conditioned Chip Enable Output
–444
PFI
PFI Power-fail Input
–555
PFO
PFO Power-fail Output
3333
VSS
Ground


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