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9. Flow Chart of Troubleshooting
9-1. Power On
' Power On ' does not work
Check the current consumption
more than 100mA
Check the VBAT
more than 3.3V
C301(VBAT) = 3.0V?
Check the MEM_1.8V of U304
is more than 1.8V
Check U304
3.0V_DIG = 3.0V
3.0V_ANLG = 3.0V
1.2V_ANLG = 1.2V
Check CLK32K
Freq = 32KHz
Check the initial operation
Yes
Yes
Yes
Yes
1.8V
Yes
Yes
Yes
Yes
END
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No
Download again
No
Check the Battery
No
Check the related circuit
①
No
Check the
U304
②
No
Check the
U304
and
③
No
Check the clock
32KHz_DIGIT
9-1
and
L301
C328, C329, C347
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