Dear Sir,
When we use the LP55281 driving LED, we have some problem.
Our hardware:
MCU is Nordic nRF52832
LED driver IC is LP55281
Now, we use 6 pcs LP55281 EVM to light on our LED matrix, we find if connect 2 pcs LP55281 EVM, the LEDs can light on and system can running.
If we connect 3 pcs EVM, the system will be crash.
The SPI CLOCK signal generated by nRF52832 is as follows (No any EVM connect):
When we connect 2 pcs EVM, we can see that the low level of the signal is raised upwards, but the LED can still be lit normally.
When we connect 3 pcs EVM, we can find that the low level of the signal is pulled higher, the LED cannot be lit, and the system is down.
We don't know what is the problem ? Any people can help us ?
