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SP690ACN Datasheet(PDF) 4 Page - Sipex Corporation

Part # SP690ACN
Description  Low Power Microprocessor Supervisory with Battery Switch-Over
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP690ACN Datasheet(HTML) 4 Page - Sipex Corporation

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SP690A/692ADS/08
SP690A/692A Low Power Microprocessor Supervisory with Battery Switch-Over
© Copyright 2000 Sipex Corporation
4
PIN ASSIGNMENTS
Pin 1 —V
OUT — Output Supply Voltage. VOUT
connects to V
CC when VCC is greater than
V
BATT and VCC is above the reset thresh-
old. When V
CC falls below VBATT and
V
CC is below the reset threshold, VOUT
connects to V
BATT. Connect a 0.1µF
capacitor from V
OUT to GND.
Pin 2 — V
CC — +5V Supply Input
Pin3 — GND — Ground reference for all signals
Pin 4 — PFI — Power-Fail Input. This is the
noninverting input to the power-fail com-
parator. When PFI is less than 1.25V,
PFO goes low. Connect PFI to GND or
V
OUT when not used.
Pin 5 — PFO — Power-Fail Output.
Pin 6 — WDI — Watchdog Input. WDI is a
three level input. If WDI remains high or
low for 1.6sec, the internal watchdog timer
triggers a reset. If WDI is left floating or
connected to a high-impedance tri-state
buffer, the watchdog feature is disabled.
The internal watchdog timer clears when-
ever reset is asserted.
Pin 7 for SP690A/692A/802 only — RESET
(Active Low)– Reset Output. RESET Out-
put goes low whenever V
CC falls below
the reset threshold or whenever WDI
remains high or low longer than 1.6
seconds. RESET remains low for 200ms
after V
CC crosses the reset threshold
voltage on power-up or after being trig-
gered by WDI.
Pin 7 for SP805 only — RESET (Active High)–
Reset Output is the inverse of RESET;
when RESET is asserted, the RESET
output voltage = V
CC
or V
BATT ,
whichever is higher.
Pin 8 — V
BATT — Backup-Battery Input. When
V
CC falls below the reset threshold, VBATT
will be switched to V
OUT if VBATT is
20mV greater than V
CC. When VCC rises
20mV above V
BATT, VOUT will be
reconnected to V
CC.
The 40mV
hysteresis prevents repeated switching if
V
CC falls slowly.
Figure 10. Pinout
Figure 11. Internal Block Diagram
VOUT
VCC
GND
PFI
VBATT
RESET (RESET)*
WDI
PFO
1
2
3
4
5
6
7
8
*( ) SP805 only
1.25V
0.8V
3.5V
1.25V
BATTERY-SWITCHOVER
CIRCUITRY
PFI
WDI
VCC
VBATT
RESET
GENERATOR
VOUT
RESET
(RESET)*
PFO
WATCHDOG
TIMER
*( ) SP805 only


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