PmodIA not working propperly

[guillem sans]

Hello,

About a week ago i purchased the PmodIA from Digikey, right now i have it connected to a RaspberryPi3 to the 5V supply.
The select pin is connected to ground, SCL and SDA from the board are connected to the SCL and SDA from the RPi respectiveley.

Until now I've been able to read and write at the register 0x81, but I am not able to read the temperature of the device as you can see from the simple code I provide next:

import smbus
from time import sleep

ADDR_DEV =          0x0D

def write_reg(reg, value):
        
    bus.write_byte_data(ADDR_DEV, reg, value)
    
def read_reg( reg):
    return bus.read_byte_data(ADDR_DEV, reg)

bus = smbus.SMBus(1)

#reset
write_reg(0x81,0x10)
#Command measure temperature
write_reg(0x80,0x90)
#Command read register
print("0x80:    ",bin(read_reg(0x80)))
#status
status = 0
while status == 0:
    status = read_reg(0x8F) & 0x01
    print("0x8F:    ",bin(read_reg(0x8F)))
    print("data not available")
    sleep(2)
temp1=read_reg(0x92)
temp2=read_reg(0x93)
temp = ((temp1 & 0b111111)<<8 ) + temp2
temp = temp/32
print("temperature:  ", temp)


#Power down
write_reg(0x80,0xA0)   

The result of executing this simple program are here:

Quote

0x80:     0b10010000
0x8F:     0b1110000
data not available
0x8F:     0b1110000
data not available
0x8F:     0b1110000
data not available
0x8F:     0b1110000
data not available

I tested this same program with a single AD5933 with a 100k RFB connected and it works propperly.

If anyone would be so kind to provide any insight on what could be the issue with my device i would apreciate it very much.

Thank you for your time.

[jpeyron]

Hi @guillem sans,

Here is a forum thread where a community member was able to get the PmodIA working with a Raspberry Pi.  They describe the need for calibrating and the process they used as well as their completed project. 

cheers,

Jon