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A6155
Voltage Monitoring
Timer Reaction
Combined Voltage and Timer Reaction
TSEN
TSEN
TSEN
TSEN
T
POR
T
POR
RES
V
IN
V
REF
V
HY
Conditions:
V
OUTPUT ≥ 3 V
No timeout
Fig. 5
TCW+TOW
T
OW
V
IN
V
REF
TCL
RES
EN
Condition:
V
OUTPUT ≥ 3 V
- Watchdog timer reset
TCL
too early
3 correct TCL services
→EN goes active low
1
2
3
T
POR=TWD
T
CW
T
RI
T
RIR
After 3 reset pulse periods
→ switch to R internal
Fig. 7
TTCL
TCW + TOW
- Watchdog timer reset
Conditions: VIN > VREF after power-up sequence
TCL
RES
3 correct TCL services
→EN goes active low
1
2
3
Timeout
TCW +TOW
TCW + TOW
TCW + TOW
TCW
TCW + TOW
TRI
TWDR
TRIR
TCW
TOW
TWDR
After 3 reset pulse
periods
→ switch to R internal
After one edge (falling or rising)
on TCL input
→ switch to R input
Fig. 6
EN
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