ADS131E08 ChnSET

Jeff Ward

Other Parts Discussed in Thread: ADS131E08

I have the ADS131E08 running.

I read the ID registar and get 0xC0 which says its a 4-ch device?

I can configure all the first 4 channels but can never reconfigure channels 5,6,7,8.

They always read 0x10.

I can read and write to all other registars.

I tried different SCLK rates, modes, all sorts of delays and any trick I could think to try; multiple byte send, a single byte send, etc..

Any ideas on this problem?

0 Jeff Ward over 11 years ago

numbers on chip: 27ARCVWG4 ADS131E08

4 channels work. reading MVdd correctly

and tested channel 3 which reads various input voltages as normal.

4 channels are always dead; ch5,ch6,ch7,ch8.

no MVdd reads on any and on test channel 6, no matter what input voltage, always reads 0xFF.

WHATS UP TI !!!

0 Jeff Ward over 11 years ago

Sorry, my bad !!

Just added proper delays right after power up and around the reset cycle and CS low.

Works good now !!

// A/D Init //////////////////////////

AD_RESET=1; //not in reset

AD_PWRDN=0; //power off

AD_START=0; //no start

AD_CS=1; //no chip select

Delay10KTCYx(200); //

AD_PWRDN=1; //power up

Delay10KTCYx(200); //

AD_RESET=0; // reset cycle

Delay10KTCYx(200); //

AD_RESET=1; //not in reset

OpenSPI1(sync_mode,bus_mode,smp_phase );

Delay10KTCYx(100); //

AD_CS=0; // select A/d

Delay10KTCYx(40); //need 4 A/D Tclk

WriteSPI1(0x11);//SDATAC = 0x11 cmd to stop continuous

Delay10KTCYx(20); //

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