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TLC5924 not working properly

George
Intellectual 440 points
Other Parts Discussed in Thread: BQ24072, TLC5924

hello

I am now working on a project that useTLC5924 to drive several LEDs.

The power supply for TLC5924(VCC)  is from a LDO(TPS73633), which is aslo the source for VLED power. A MCU(STM32) is programed to control the TLC chip via sereral lines，including BLANK\XLAT\MODE\SCLK\SIN. SOUT and XERR are left unconnected. MCU and TLC5924 share the same power source. The input power for TPS73633 is from a charger chip(bq24072). BQ24072 is used for charging battery, and provding a power supply for the system.

 Now,there are some problems.

1. The charger chip namely BQ24072 seems to work in abnormal state, since the PGOOD pin is always in high-impendance state.But the output voltage in within specified limits.

2. TLC5924 can not drive LEDs more than one, in other words, there is at most one LED lighting on at any time. What's worse, I cant not control certain LED the way think sometimes in MCU.

 Any tips or thoughts will be appreciated

Regards.

  • 0
    Intellectual 440 points
    Update

    Now the TLC5924 Is working normally. The problem comes from my misunderstanding of the datasheet of the LED Driving IC. Driver codes lost some important aspects.

    But, the problem of BQ24072 remains unsolved. Any one has encountered such problem?

    Thanks.