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What is the phenomenon of the LED indicator in the CY4532 Power Board?
LED indicator in different versions of CY4532 Power Board has different phenomena.
Figure 1. LED Indicator Circuit in Rev 06 of CY4532 Power Board
Older versions (before Rev 06) of CY4532 Power Board connects LED1 to PG pin of SC8802 as is shown in Figure 1. When VBUS reaches 90% to 110% of desired voltage, PG pin of SC8802 will be pulled to high, else it will stay low. So, LED1 will flash once after the main board of CY4532 is powered up. When there are power issues, LED1 turns on and blinks infrequently.
Figure 2. LED Indicator Circuit in Rev 07 of CY4532 Power Board
However, the latest Rev 07 of CY4532 Power Board has a modified LED indicator circuit. LED1 is directly connected to VDDD of CCG3PA. In this version of CY4532 Power Board, LED1 turns on when CCG3PA is powered up. When there are power issues, LED1 will blink unsteadily or does not turn on at all.
The LED indication circuit is printed on the CY4532 power board close to LED1, which could be easily identified.