AT73C203_14 Datasheet, PDF (17/106 Pages) ATMEL Corporation – Power Management

AT73C203
Figure 8. Startup State Machine (2 of 3)
GUARD_TIME_END
PSU unplugged
USB plugged in
FLAG_USB = 0
Button not pressed
USB not present
Startup State Machine (2)
USB_DEBOUNCE
1
2
Wait USB present during 10 ms
3
START_USB
Main bandgap on
Current generator on
ADC on
BGP_ADC_START
2
Wait bandgap start 5 ms
1
End of bandgap timer
Charger Debounce
PSU present
TEMPERATRUE_TEST ₂
Temperature not correct
3
3
PSU present
1
TEMPERATURE_NOK
Wait temperature ok
Temperature correct
1
2
Temperature correct
4
CHARGER_DEBOUNCE
PSU present
1
PSU present
BAT1 > 3.8 V and timer still running
Charger on: battery 150 mA
Charger timer launched
CHARGER_ON
4
USB unplugged
2
USB unplugged
GUARD_TIME_END
GUARD_TIME_END
BAT1 < 3.8 V
4
2
USB_FST = 1 BAT1_CHECK
3
BAT1 > 3.8 V during 10 ms
1
Wait BAT1 > 3.8 V during 10 ms
End of charger timer
and BAT1 > 3.8V
BATTERY_ERROR
Charger off
USB deconnected or PSU connected
START
GUARD_TIME_END
17
2742B–PMGMT–03/04