V_EXT_CHARGE
C503
C504
ZD501
5.0V
+VBUS
AUX_ON
END_OF_CHG
CHG_ON
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+VDD_IO_HIGH
R511
U502
1
BAT 10
CRDL
2
9
USB
ICDL
3 _PPR
GND 8
4
USBON 7
_CHG
5
_EN
IMIN
6
GND
11
C506
R515
7- 7
F low Chart of Troubleshooting
Typical 3.7V
VBAT
R510
Typical 1.4V
MES_BATT
ZD500
C505
R512
USB_CHG_ON
R514
BATTERY CHARGING