STCF04 Datasheet, PDF (29/43 Pages) STMicroelectronics – Cell phones and smartphones

STCF04
10 Theory of operation
Theory of operation
10.1
The state machine diagram
The state machine diagram of the device describes the overall function of the logic part of
the device. It helps with the understanding of all the working modes of the complex and
efficient management of the stored energy.
Figure 13. State machine diagram of the STCF04
From any states
!PWR_ON || !RESET
!PWR_ON & NTC
Battery plug-in
Shutdown
NTC
!PWR_ON & !NTC
NTC
!NTC & PWR_ON
PWR_ON
IDLE
!PWR_ON & MONTR
!PWR_ON || !MONTR
AuxLed_ON
MaxTimeLed
!TCH_ON
Aux
LED
On
Status_Register
read
LOCK
CHRG
|| FLASH_ON
|| TCH_ON
!CHRG
|| (READY
& !FLASH _ON &
!TCH_ON)
MaxTimeFlash
CHRG
FLASH_ON
& READY
FLASH_ON
& READY &
LS
TCH_ON
& READY
&!TCHV_H
Torch
eff.
+
CHRG
+ NTC
Monitoring
ALARM
From any states
Flash
+
CHRG
+ NTC
Flash
+
CHRG
+ NTC
+ LS
TCH_ON
& READY
&TCHV_H
Torch
+
CHRG
+ NTC
PWR_ON = Power ON
MONTR = Monitoring ON
LS_ON = Light Sensor ON
CHRG = Charging ON
FLASH_ON = bit Flash_ON & pin Flash ON
TCH_ON = bit TCH_ON & pin Torch ON
AuxLED_ON = Auxiliary led ON
READY = Ready Pin
AM11887v1
Doc ID 022927 Rev 3
29/43