SP690A/692ADS/08 SP690A/692A Low Power Microprocessor Supervisory with Battery Switch-Over
Copyright 2000 Sipex Corporation
1
SP690A/692A/802L/
802M/805L/805M
Low Power Microprocessor Supervisory
with Battery Switch-Over
The SP690A/692A/802L/802M/805L/805M are a family of microprocessor (
P) supervisory
circuits that integrate a myriad of components involved in discrete solutions to monitor power-
supply and battery-control functions in
P and digital systems. The series will significantly
improve system reliability and operational efficiency when compared to discrete solutions.
The features of the SP690A/692A/802L/802M/805L/805M include a watchdog timer, a
P
reset and backup-battery switchover, and power-failure warning, a complete
P monitoring
and watchdog solution. The series is ideal for applications in automotive systems, computers,
controllers, and intelligent instruments. All designs where it is critical to monitor the power
supply to the
P and it's related digital components will find the series to be an ideal solution.
s
Precision Voltage Monitor:
SP690A/SP802L/SP805L at 4.65V
SP692A/SP802M/SP805M at 4.40V
s
Reset Time Delay - 200ms
s
Watchdog Timer - 1.6 sec timeout
s
Minimum component count
s
60
A Maximum Operating Supply Current
s
0.6
A Maximum Battery Backup Current
s
0.1
A Maximum Battery Standby Current
s
Power Switching
250mA Output in V
CC
Mode (0.6
)
25mA Output in Battery Mode (5
)
s
Voltage Monitor for Power Fail or
Low Battery Warning
s
Available in 8 pin SO and DIP packages
s
RESET asserted down to V
CC
= 1V
s
Pin Compatible Upgrades to
MAX690A/692A/802L/802M/805L
DESCRIPTION
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%
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.
4
V
m
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4
SP690A/692ADS/08 SP690A/692A Low Power Microprocessor Supervisory with Battery Switch-Over
Copyright 2000 Sipex Corporation
2
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation
of the device at these ratings or any other above those
indicated in the operation sections of the specifica-
tions below is not implied. Exposure to absolute maxi-
mum rating conditions for extended periods of time
may affect reliability and cause permanent damage to
the device.
V
CC
........................................................-0.3V to 6.0V
V
BATT
.....................................................-0.3V to 6.0V
All Other Inputs (NOTE 1)..................-0.3V to (V
CC
to 0.3V)
Input Current:
V
CC
.........................................................250mA
V
BATT
........................................................50mA
GND........................................................20mA
Output Current:
V
OUT
.....Short-Circuit Protected for up to 10sec
All Other Inputs.................................20mA
Rate of Rise, V
CC
,V
BATT
..................100V/
s
Continuous Power Dissipation.......500mW
Storage Temperature.......-65
C to +160
C
Lead Temperature(soldering,10sec).................+300
C
ESD Rating.............................................................4KV
SPECIFICATIONS
V
cc
=4.75v to 5.50V for SP690A/SP802L/SP805L, V
CC
=4.50V to 5.50V for SP692A/SP802M/SP805M, V
BATT
=2.80V, T
A
=T
MIN
to T
MAX
, typical specified at 25
O
C,
unless otherwise noted.
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SP690A/692ADS/08 SP690A/692A Low Power Microprocessor Supervisory with Battery Switch-Over
Copyright 2000 Sipex Corporation
3
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3
=
NOTE 1: The input voltage limits on PFI (pin 4) and WDI (pin 6) may be exceeded if the current into
these pins is limited to less than 10 mA.
NOTE 2: Either V
CC
or V
BATT
can go to 0V if the other is greater than 2.0V.
NOTE 3: "-" equals the battery-charging current, "+" equals the battery-discharging current.
NOTE 4: WDI is guaranteed to be in an intermediate, non-logic level state if WDI is floating and V
CC
is in the operating voltage range. WDI is internally biased to 35% of V
CC
with an input impedance of
50K
.
NOTE 5: SP690A, SP692A, SP802L, and SP802M only.
NOTE 6: SP805L and SP805M only.
SPECIFICATIONS (continued)
V
cc
=4.75v to 5.50V for SP690A/SP802L/SP805L, V
CC
=4.50V to 5.50V for SP692A/SP802M/SP805M, V
BATT
=2.80V, T
A
=T
MIN
to T
MAX
, typical specified at 25
O
C,
unless otherwise noted.
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. V
OUT
connects to V
CC
when V
CC
is greater than
V
BATT
and V
CC
is above the reset thresh-
old. When V
CC
falls below V
BATT
and
V
CC
is below the reset threshold, V
OUT
connects to V
BATT
. Connect a 0.1
F
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, V
BATT
will be switched to V
OUT
if V
BATT
is
20mV greater than V
CC
. When V
CC
rises
20mV above V
BATT
, V
OUT
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
V
OUT
V
CC
GND
PFI
V
BATT
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
V
CC
V
BATT
RESET
GENERATOR
V
OUT
RESET
(RESET)*
PFO
WATCHDOG
TIMER
*( ) SP805 only
SP690A/692ADS/08 SP690A/692A Low Power Microprocessor Supervisory with Battery Switch-Over
Copyright 2000 Sipex Corporation
5
V
CC
Supply Current vs.
Temperature (Normal Mode)
Battery Supply Current vs.
Temperature (Backup Mode)
51
47
43
39
35
31
27
23
19
-60 -30 0 30
60 90 120 150
V
CC
Current (
A)
Temperature Deg. C
2.9
2.4
1.9
1.4
0.9
0.4
-0.1
V
BATT
Current (
A)
-60
Temperature Deg. C
-40 -20
0 20 40 60 80 100 120 140
V
CC
=5V
V
BATT
=2.8V
V
CC
=0V
V
BATT
=2.8V
TYPICAL CHARACTERISTICS
(25
o
C, unless otherwise noted)
-60 -30 0 30
60 90 120 150
Temperature Deg. C
PFI Threshold
vs. Temperature
1.256
1.254
1.252
1.250
1.248
1.246
PFI Threshold (V)
V
CC
=5V
V
BATT
=0
NO LOAD ON PFO
V
BATT
to V
OUT
ON
Resistance vs. Temperature
V
CC
to V
OUT
On
Resistance vs. Temperature
15
10
5
0
Resistance (ohms)
-60 -30 0 30 60 90 120 150
Temperature Deg. C
0.9
0.8
0.7
0.6
0.5
0.4
0.3
Resistance (ohms)
Temperature Deg. C
V
BATT
=2.8V
V
BATT
=4.5V
V
CC
=0V V
BATT
=2V
Reset Threshold
vs. Temperature
4.70
4.69
4.68
4.67
4.66
4.65
4.64
4.63
4.62
4.61
4.60
Reset Threshold (V)
Temperature Deg. C
V
BATT
=0V
Power Down
V
CC
=5V
V
BATT
=0V
Reset Output Resistance
vs. Temperature
Reset Delay
vs. Temperature
600
500
400
300
200
100
0
Resistance (ohms)
-60 -30 0 30
60 90 120 150
Temperature Deg. C
212
210
208
206
204
202
200
Reset Delay (mS)
-60 -30 0 30
60 90 120 150
Temperature Deg. C
V
CC
=5V,V
BATT
=2.8V
Soucing Current
V
CC
=0V to 5V Step,
V
BATT
=2.8V
V
CC
=0V,V
BATT
=2.8V
Sink Current
IE+2
IE+1
IE+0
IE-1
IE-2
IE-3
IE-4
IE-5
IE-6
IE-7
IE-8
V
BATT
Current(
A) Log Scale
.0000 5.000
V
CC
(0.5V/div)
Battery Current vs. V
CC
Voltage
V
BATT
=2.8V
SP690A
-60 -30 0 30 60 90 120 150
-60 -30 0 30 60 90 120 150
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