MIC2755 Datasheet, PDF (8/12 Pages) Micrel Semiconductor – Battery System Supervisor Preliminary Information

V_MAIN
R1
1.77M
Lithium
Coin
Cell
R4
436k
R5
564k
R2
13.2k
R3
1.21M
R_PULLUP
MIC2755
VDD
/POF
PTH
/NMI
NTH
/RST
RTH(/MR) GND
MIC5205-3.3
IN OUT
EN GND
Backup
Power
3.3V
Power Rail
R_PULLUP R_PULLUP
Power Fail
Warning Flag
System
Reset
Figure 5. Voltage Supervisor and Backup Battery Monitor
V_BAT
R4
R1
651k 1.77M
R5
R2
349k 13.2k
R3
1.21M
R_PULLUP
MIC2755
VDD
/POF
PTH
/NMI
NTH
/RST
RTH(/MR) GND
MIC5245-3.3
IN OUT
EN GND
3.3V
Power Rail
R_PULLUP R_PULLUP
Power Fail
Warning Flag
System
Reset
Figure 6. Voltage Supervisor With Power Fail Warning