®
SP690A/692A/802L/
802M/805L/805M
Low Power Microprocessor Supervisory
with Battery Switch-Over
FEATURES
■
Precision Voltage Monitor:
SP690A/SP802L/SP805L at 4.65V
SP692A/SP802M/SP805M at 4.40V
■
Reset Time Delay - 200ms
■
Watchdog Timer - 1.6 sec timeout
■
Minimum component count
■
60µA Maximum Operating Supply Current
■
0.6µA Maximum Battery Backup Current
■
0.1µA Maximum Battery Standby Current
■
Power Switching
250mA Output in V
CC
Mode (0.6Ω)
25mA Output in Battery Mode (5Ω)
■
Voltage Monitor for Power Fail or
Low Battery Warning
■
Available in 8 pin SO and DIP packages
■
RESET asserted down to V
CC
= 1V
VOUT
VCC
GND
PFI
1
2
3
4
8 PIN NSOIC
8
7
6
5
VBATT
RESET (RESET)*
WDI
PFO
*SP805 only
Now Available in Lead Free Packaging
■
Pin Compatible Upgrades to
MAX690A/692A/802L/802M/805L
APPLICATIONS
■
Critical
µP
Power Monitoring
■
Intellegent Instruments
■
Computers
■
Controllers
DESCRIPTION
The
SP690A/692A/802L/802M/805L/805M
are a family of microprocessor (µP) supervisory
circuits that integrate a myriad of components involved in discrete solutions to monitor power-
supply and battery-control functions in
µP
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
µP
reset and backup-battery switchover, and power-failure warning, a complete
µP
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
µP
and it’s related digital components will find the series to be an ideal solution.
PART NUMBER
SP690A
SP692A
SP802L
SP802M
SP805L
SP805M
RESET
Threshold
4.65 V
4.40 V
4.65 V
4.40 V
4.65 V
4.40 V
RESET
Accuracy
125mV
125mV
75mV
75mV
125mV
125mV
RESET Active
LOW
LOW
LOW
LOW
HIGH
HIGH
PFI Accuracy
4%
4%
2%
2%
4%
4%
Date: 1/19/05
SP690A/692A Low Power Microprocessor Supervisory with Battery Switch-Over
© Copyright 2005 Sipex Corporation
1
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/µs
Continuous Power Dissipation.......500mW
Storage Temperature.......-65°C to +160°C
ESD Rating.............................................................4KV
ELECTRICAL CHARACTERISTICS
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.
PARAMETERS
Operating Voltage Range,
MIN.
0
TYP.
MAX.
5. 5
UNITS
Volts
CONDITIONS
V
CC
or V
BATT
, Note 2
Supply Current, I
SUPPLY
,
I
SUPPLY
in Battery Backup Mode,
V
CC
= 0V, V
BATT
= 2.8V
V
BATT
Standby Current, NOTE 3
V
OUT
Output
V
OUT
in Battery-Backup Mode
V
CC
< V
BATT
- 0.2V
Battery Switch Threshold,
V
CC
to V
BATT
Battery Switchover Hysteresis
Reset Threshold
4.50
4.25
4.55
4.30
-0.1
V
CC
- 0.1
V
BATT
-0.15
V
CC
- 0.03
V
CC
- 0.15
V
BATT
- 0.04
V
BATT
- 0.20
20
-20
40
4.65
4.40
4.75
4.50
4.70
4.45
35
0.001
60
0.6
0.02
µA
µA
µA
Volts
V
CC
> V
BATT
+ 0.2V
I
OUT
= 50mA
I
OUT
= 250mA
I
OUT
= 5mA
I
OUT
= 25mA
Power-up
Power-down
Peak to Peak
SP690A, SP802L, SP805L
SP692A, SP802M, SP805M
SP802L, T
A
= +25° C, V
CC
falling
SP802M, T
A
= +25° C, V
CC
falling
excluding I
OUT
Volts
mV
mV
Volts
Date: 1/19/05
SP690A/692A Low Power Microprocessor Supervisory with Battery Switch-Over
© Copyright 2005 Sipex Corporation
2
ELECTRICAL CHARACTERISTICS
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.
PARAMETERS
Reset Threshold Hysteresis
Reset Pulse Width, t
RS
RESET Output Voltage,
NOTE 5
MIN.
TYP.
40
MAX.
UNITS
mV
CONDITIONS
Peak to Peak
140
V
CC
- 1.5
200
280
ms
I
SOURCE
= 800
µA
0.1
0.004
0.4
0.3
Volts
I
SINK
= 3.2mA
I
SINK
= 50
µ
A, V
CC
= 1.0
I
SOURCE
= 4
µ
A, V
CC
= 1.0V,
RESET Output Voltage,
NOTE 6
0.8
V
CC
- 1.5
0.1
0.4
2.25
sec
ns
0.8
3.5
50
-50
1.250
1.250
0.01
150
Volts
µA
Volts
I
SOURCE
= 800
µA
I
SINK
= 3.2mA
Watchdog Timeout, t
WD
WDI Pulse Width, t
WP
NOTE 7
WDI Input Threshold,
V
CC
= 5V, NOTE 4
WDI Input Current
1.00
50
1.60
V
IL
= 0.4V, V
IH
= (0.8)(V
CC
)
Logic low
Logic high
WDI =V
CC
WDI = 0V
SP690A/692A, SP805L/M
SP802L/M
-150
PFI Input Threshold
1.200
1.225
PFI Input Current
PFO Output Voltage
-25
V
CC
- 1.5
1.300
1.275
25
Volts
nA
Volts
I
SOURCE
= 800
µA
I
SINK
= 3.2mA
0.1
0.4
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
50KΩ.
NOTE 5:
SP690A, SP692A, SP802L, and SP802M only.
NOTE 6:
SP805L and SP805M only.
NOTE 7:
WDI Minimum Rise/Fall time is 2µs.
Date: 1/19/05
SP690A/692A Low Power Microprocessor Supervisory with Battery Switch-Over
© Copyright 2005 Sipex Corporation
3
V
BATT
BATTERY-SWITCHOVER
CIRCUITRY
V
OUT
V
OUT
V
CC
GND
PFI
1
2
3
4
8
7
6
5
V
BATT
RESET (RESET)*
WDI
PFO
*( ) SP805 only
3.5V
WDI
WATCHDOG
TIMER
1.25V
V
CC
RESET
GENERATOR
RESET
(RESET)*
Figure 10. Pinout
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 0.1µF
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.
Date: 1/19/05
SP690A/692A Low Power Microprocessor Supervisory with Battery Switch-Over
© Copyright 2005 Sipex Corporation
0.8V
PFI
PFO
1.25V
*( ) SP805 only
Figure 11. Internal Block Diagram
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.
4
TYPICAL PERFORMANCE CHARACTERISTICS
V
CC
Supply Current vs.
Temperature (Normal Mode)
51
47
43
39
35
31
27
23
19
-60 -30
Battery Supply Current vs.
Temperature (Backup Mode)
2.9
PFI Threshold
vs. Temperature
1.256
V
BATT
Current (µA)
V
CC
Current (µA)
2.4
1.9
1.4
0.9
0.4
PFI Threshold (V)
V
CC
=5V
V
BATT
=2.8V
V
CC
=0V
V
BATT
=2.8V
1.254
1.252
1.250
1.248
1.246
-60
-30
0
V
CC
=5V
V
BATT
=0
NO LOAD ON PFO
0
30
60
90
120 150
-0.1
-60 -40 -20 0 20 40 60 80 100 120 140
30
60
90
120 150
Temperature Deg. C
Temperature Deg. C
Temperature Deg. C
V
BATT
to V
OUT
ON
Resistance vs. Temperature
15
0.9
V
CC
to V
OUT
On
Resistance vs. Temperature
Resistance (ohms)
0.8
0.7
0.6
0.5
0.4
0.3
Resistance (ohms)
10
V
BATT
=2.8V
5
V
BATT
=4.5V
0
-60
-30
0
30
60
90
120
150
-60 -30
0
30
60
90
120 150
Reset Threshold (V)
V
CC
=0V
V
BATT
=2V
V
CC
=5V
V
BATT
=0V
4.70
4.69
4.68
4.67
4.66
4.65
4.64
4.63
4.62
4.61
4.60
Reset Threshold
vs. Temperature
SP690A
V
BATT
=0V
Power Down
-60 -30
0
30
60
90
120 150
Temperature Deg. C
Temperature Deg. C
Temperature Deg. C
Reset Output Resistance
vs. Temperature
600
Reset Delay
vs. Temperature
212
Reset Delay (mS)
Resistance (ohms)
210
208
206
204
202
200
-60
V
BATT
Current(µA) Log Scale
V
CC
=5V,V
BATT
=2.8V
500
Soucing Current
400
300
200
100
0
-60
V
CC
=0V to 5V Step,
V
BATT
=2.8V
Battery Current vs. V
CC
Voltage
IE+2
IE+1
IE+0
IE-1
IE-2
IE-3
IE-4
IE-5
IE-6
IE-7
IE-8
.0000
V
BATT
=2.8V
V
CC
=0V,V
BATT
=2.8V
Sink Current
-30
0
30
60
90
120 150
-30
0
30
60
90
120 150
Temperature Deg. C
Temperature Deg. C
V
CC
(0.5V/div)
5.000
(25
o
C, unless otherwise noted)
Date: 1/19/05
SP690A/692A Low Power Microprocessor Supervisory with Battery Switch-Over
© Copyright 2005 Sipex Corporation
5
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