Datasheet

Description STM690, STM704, STM795, STM802, STM804, STM805, STM806
10/42 Doc ID 10519 Rev 9
1.1.9 E (chip enable input)
The input to the chip enable gating circuit. Connect to ground if unused.
1.1.10 E
CON
(conditional chip enable)
E
CON
goes low only when E is low and reset is not asserted. If E
CON
is low when reset is
asserted, E
CON
will remain low for 15 µs or until E goes high, whichever occurs first. In the
disabled mode, E
CON
is pulled up to V
OUT
.
1.1.11 V
BAT
(backup battery input)
When V
CC
falls below V
SO
, V
OUT
switches from V
CC
to V
BAT
. When V
CC
rises above V
SO
+
hysteresis, V
OUT
reconnects to V
CC
. V
BAT
may exceed V
CC
. Connect to V
CC
if no battery is
used.
Table 3. Pin description
Pin
Name Function
STM795
STM690
STM802
STM704
STM806
STM804
STM805
— — 6 — MR Push-button reset input
— 6 — 6 WDI Watchdog input
7 7 7 — RST
Active-low reset output
— — — 7 RST Active-high reset output
— 4 4 4 PFI Power-fail input
— 5 5 5 PFO
Power-fail output (push-pull)
1 1 1 1 V
OUT
Supply output for external LPSRAM
2 2 2 2 V
CC
Supply voltage
3 — — — Vccsw
V
CC
switch output (push-pull)
4 3 3 3 V
SS
Ground
5 — — — E
Chip enable input
6 — — — E
CON
Conditioned chip enable output
8 8 8 8 V
BAT
Backup battery input