For setup and programming I followed the instructions of the datasheet.
- i2c master µC: ATMEGA32U4 (datasheet).
- The PCA9634 is the only bus slave so i chose the address 0x01 (A0=HIGH and A1..A6 connected to gnd).
- bus speed: 100kHz
- pull up resistors: 4k7 (Vdd = 5V)
- LED resistors 430 ohms / I = 11mA
The schematic is attached.
The PCA9634 works fine for a while (about 10 minutes) then it stucks at the current state (blinking, permanent on/off).
Analyzing the signals with an oscilloscope shows:
- SDA = 5V
- SCL = 1V constant.
After power off/on reset the chip does not work anymore at all!
Furthermore I used another µC as master (SAMat03463 --> datasheet) and in a third scenario an i2c-USB emulator.
I always have the same result as described.
Does anybody has an advice for this issue or had a similar behavior?
I`m very grateful for every response.