NTM88 SPI tSPI_EN time & BKGD background mode

[Thomas_2022]

Dear All,

I have two questions.

(1)tSPI_EN value is ??

Which document I can find this value?

I didn't find this value in both ntm88 manual & SPI programming doc.

(2)BACKGROUND mode

How to program sensor in BACKGROUND mode?

I pull low BKGD pin then  reset NTM88 pin to enter BACKGROUND mode .

It looks like failed, I can't program NTM88 sensor by external mcu SPI interface. 

But, if I pull low BKGD then turn off-> turn on sensor power, it can enter BACKGROUND mode.

What’s the difference? Is that possible to enter into BACKGROUND mode by BKGD low then reset sensor by RSTB ?

Thanks.

[guoweisun · Accepted solution]

1：tSPI_EN parameter value showed in datasheet page13.

2: If the BKGD/PTA4 pin is held low when the device comes out of a
power-on-reset (POR), the device switches into the ACTIVE BACKGROUND
DEBUG mode (BDM).