Category: Hardware
Product Number: AD5292
Hi
I have a digital potentiometer connected via SPI to microcontroller. STM32F303K8. SPI clock frequency is 1 MHz.
On power on, the potentiometer is set to middle position, 10 kOhm on each side (RWA and RWB). Measuring with multimeter.
I am sending command as per datasheet. 16 bits in one SPI frame.
MSB
0 0
0 0 0 1 - command for setting RDAC
10 bits for data
LSB
Idle clock is high, data is valid on falling edge (checked on logic anyzer)
RESET pin is connected to 3V3
VDD is 9V
GND is common to microcontroller
Vlogic is 3V3
pin 14 NC
Despite verifying the SPI configuration and sending the command frame as required, I am unable to get the potentiometer to respond and adjust its resistance.
Side note:
We have working AD5280 via I2C bus, which is 8-bit device, but we beed more resolution. Based on requirement for voltages up to 8 V, we selected the AD5292 digital potentiometer.
Could you please advise on any additional troubleshooting steps or potential issues with my current configuration?
Thank you for your support.
Best regards,
Urban
