P RODUCT DATABOOK 1 9 9 6 / 1 9 9 7
MC33164-3/ MC34164-3
3 V UNDERVOLTAGE
S
ENS I NG
CI RCUI T
P R O D U C T I O N D A T A S H E E T
T Y P I C A L A P P L I C A T I O N C I R C U I T S
FIGURE 17. — SWITCHING THE LOAD OFF WHEN
FIGURE 16. — LOW VOLTAGE MICROPROCESSOR RESET
BATTERY REACHES BELOW 2.7V
R
V
IN
RESET
CDLY
Power
Supply
Microprocessor
Circuit
Load
V
IN
RESET
1.2 VREF
1.2VREF
A time delayed reset can be accomplished with the addition of CDLY
.
For systems with extremely fast power supply rise times (< 500ns) it
is recommended that the RCDLY time constant be greater than 5.0µs.
VTH(MPU) is the microprocessor reset input threshold.
1
VTH(MPU)
tDLY = R CDLY In
1 -
V
IN
FIGURE 18. — VOLTAGE MONITOR
FIGURE 20. — SOLAR POWERED BATTERY CHARGER
1.0k
V
IN
Power
Supply
RESET
V
IN
SOLAR
CELLS
RESET
1.2VREF
1.2VREF
LED turns on when VIN < 2.7V indicating Power Supply is low.
PRODUCTION DATA - Information contained in this document is proprietary to LinFinity, and is current as of publication date. This document
may not be modified in any way without the express written consent of LinFinity. Product processing does not necessarily include testing of
all parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time.
Copyright © 1999
Rev. 1.2 6/ 99
9
MICROSEMI [ Microsemi ]
