2024400_en-US

[#1]

The clock signal of PT2001AE is lost.

The problem is as follows: when I use SPI to read the clock status register of PT2001AE, the returned data indicates that the clock is missing. However, my clock is outputting normally, and I have measured with an oscilloscope that there is a clock signal on the clk pin of PT2001AE. So why does the register indicate that the clock is missing?

Re: The clock signal of PT2001AE is lost.

Dear Babylove,

this is correct behavior. Please refer to the section 13.3.4.8 in the PT2001 full datasheet. Please download the datasheet from the PT2001 product page, under the secure files. 

With Best Regards,

Jozef

Re: The clock signal of PT2001AE is lost.I followed your suggestion and set the position to 1, then received the SPI return data again. This time, the returned data indicates **cksys_missing**.
Re: The clock signal of PT2001AE is lost.

Dear Babylove,

please refer to the section 13.3.4.8 in the PT2001 full datasheet. 

"Once the loss_of_clock bit sets, it can be reset only by completing a 'switch to clock'
pin. For this operation to complete, it must be requested when the main clock input pin
again provides a valid clock frequency."

There was probably short loss of clock and the loss_of_clock bit was set. To reset this bit the please set the switch_to_clock_pin to 1.

With Best Regards,

Jozef