SP690 SIPEX [Sipex Corporation], SP690 Datasheet - Page 13

• Manufacturer Part Number: SP690
• Description: Low Power Microprocessor Supervisory with Battery Switch-Over
• Manufacturer: SIPEX [Sipex Corporation]

Figure 19. Monitoring a Negative Voltage
Interfacing to Microprocessors with
Bidirectional Reset Pins
Microprocessors with bidirectional reset pins,
such as the Motorola 68HC11 series, can con-
tend with this series' RESET output. If, for
example, the RESET output is driven high and
the P wants to pull it low, indeterminate logic
levels may result. To correct this, connect a
4.7K resistor between the RESET output and
the P reset I/O, as in Figure 20. Buffer the
RESET output to other system components.
SP690A/692ADS/08
+5V
GND
V
CC
PFO
PFI
5.0 - 1.25
*V
*V
R
SP690A/692A Low Power Microprocessor Supervisory with Battery Switch-Over
1
TRIP
TRIP
PFO
is a negative voltage
0V
+5V
0V
=
1.25 - V
R
2
TRIP
V-
V-
R
R
2
1
13
Figure 20. Interfacing to Microprocessors with
Bidirectional RESET I/O
Buffered RESET connects to System Components
+5V
GND
V
CC
RESET
4.7K
© Copyright 2000 Sipex Corporation
RESET
+5V
P
V
GND
CC