TPS659039-Q1: Question about die temperature transfer from adc result to real temperature( Celsjus degree)?

Hi all：

I have two questions about TPS659039 PMIC, as below:

1. Is there any formula about conversion die-temperature (adc result) to real Celsjus degree temperature??

I can read the gpadc channel 12 (die temperature) adc value, but i don't know how to transfer it to Celsjus degree temperature

how can i found it in the spec ?

I also found another formula, it can be used to TPS659037

    ( ( ADC_Read_Data / 2^12) * 1.25 ) – 0.753V
TEMP = --------------------------------------------------------
                                          2.64mV

Is it can be used for TPS659039 ?

2. What is the difference between ch12 and ch13 in GPADC ?? 

I see the comment of them are the same, PMIC internal die temperature, so if i want to know pmic die temperature, read any of them is the same ??

Thanks!

Kenny