R
EM6151
Voltage Monitoring
Conditions:
VDD > 3V
No timeout
VIN
VREF
VHY
TSEN
TSEN
TSEN
TSEN
TPOR
TPOR
RES
Fig. 5
Timer Reaction
Conditions: VIN > VREF after power-up sequence
TTCL
TCW + TOW TCW + TOW
TOW
TCW
TCW + TOW
TTCL
TCW
TCW
TCL
RES
EN
TWDR
3
1
2
Timeout
3 correct TCL services
EN goes active low
- Watchdog timer reset
Fig. 6
Combined Voltage and Timer Reaction
VIN
Condition:
DD > 3V
V
VREF
TOW
TTCL
TCW
TPOR
TCL
TCW+TOW
RES
EN
1
2
3
TCL
too early
3 correct TCL services
EN goes active low
- Watchdog timer reset
Fig. 7
Copyright © 2005, EM Microelectronic-Marin SA
rev. B / 06.06
5
www.emmicroelectronic.com