PGA Select Inputs

charudattaingal — Fri, 06 May 2016 14:38:20 GMT

Hi All,

Currently I'm using register PGAINSEL[1:0] to select inputs for PGA.

10 PGA_IN0 is selected as input voltage (PGAIN).

11 PGA_IN1 is selected as input voltage (PGAIN).

Issue: The value getting as PGA output for the inputs given is getting skewed occasionally.

So I want to configure ADC option Bits to select the PGA inputs to solve this.

If I need to use ADC option bit to select PGA inputs i.e.

ADC option bit[3:0] PGA input source selection

What are all the configurations to be made.

Can anyone help on this?

-Charudatta

Re: PGA Select Inputs

RadekS — Tue, 10 May 2016 14:53:48 GMT

Hi Charudatta,

In attachment is simple ADC example code for S12ZVL.

So, for measuring PGA_IN0 and PGA_IN1 you may configure commands like:

#define PGA_ADC 0x0F //See table Analog Input Channel Select in refernce manual

adc0_cmdlist[0] = CMD_SEL(norm)+ OPT(1)+INTFLG_SEL(0)+VRH_SEL(1)+VRL_SEL(1)+CH_SEL(PGA_ADC)+SMP(0x14);

adc0_cmdlist[1] = CMD_SEL(eolw)+ OPT(2)+INTFLG_SEL(1)+VRH_SEL(1)+VRL_SEL(1)+CH_SEL(PGA_ADC)+SMP(0x14);

Note: SMP(0x14) refers to longest sampling time = 24 ADC Clock Cycles

Unfortunately, I don't have S12ZVL64/S12ZVL96/S12ZVL128 board, for now, therefore, I cannot test it.

I hope it helps you.

Have a great day,
RadekS

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topic Re: PGA Select Inputs in S12 / MagniV Microcontrollers

PGA Select Inputs

Re: PGA Select Inputs