I am troubleshooting a circuit board with a RTC (real time clock). The RTC has a battery on board to keep time. Normally the board powers up with a LCD displaying the model and then runs a self test of its other circuits. Some times after I program the flash (in circuit), the board powers up with no display. The fix for this was removing the battery from the RTC and waiting a minute. This seems to randomly fix the problem. Some boards work after the RTC has been replaced. I looked at the data sheet for the RTC and was interested in the SCLK pin.
SCLK (Serial Clock Input) – SCLK is used to synchronize data movement on the serial interface for
either the SPI or 3-wire interface.
I set up a power supply with a current limit, and forced the SCLK pin high for a second. Thinking the Processor is not synced right with the RTC. It Worked, but I could not get the timing right, some boards I tried repeatedly with different time durations. Finally I just left the SCLK pin pulled high at power up until the board generated a selftest error. Then cycled the power on the board and it started fine.
My question is, can putting 3 volts to the RTC chip damage it, or damage the processor?
SCLK (Serial Clock Input) – SCLK is used to synchronize data movement on the serial interface for
either the SPI or 3-wire interface.
I set up a power supply with a current limit, and forced the SCLK pin high for a second. Thinking the Processor is not synced right with the RTC. It Worked, but I could not get the timing right, some boards I tried repeatedly with different time durations. Finally I just left the SCLK pin pulled high at power up until the board generated a selftest error. Then cycled the power on the board and it started fine.
My question is, can putting 3 volts to the RTC chip damage it, or damage the processor?