I am trying to run an M355_ECSns_DualWE example on an EVAL-ADuCM355 board. I adjusted RTIA values, load resistors (RLOAD) and Bias. Jumpers on the eval board are shorted as well (picture below).
pAmpCfg->SensorCh0.LpTiaRf = LPTIARF_400K; /* 400kohm Rfilter, 4.7uF cap connected external on AIN4 */
pAmpCfg->SensorCh0.LpTiaRl = LPTIARLOAD_50R; /* NO2 sensor datasheet specifies 50ohm Rload */
pAmpCfg->SensorCh0.LptiaRtiaSel = LPTIARTIA_512K; /* LPTIA gain resistor is 512kohm */
pAmpCfg->SensorCh0.Vzero = 1110; /* Set Vzero = 1110mV. Voltage on SE0 & SE1 pin*/
pAmpCfg->SensorCh0.SensorBias = 0; /* 0V bias voltage */
//CO Sensor is connected to CH1 on EVAL-ADuCM355QSPZ
pAmpCfg->SensorCh1.LpTiaRf = LPTIARF_400K; /* 400kohm Rfilter */
pAmpCfg->SensorCh1.LpTiaRl = LPTIARLOAD_50R; /* 50 ohm rload */
pAmpCfg->SensorCh1.LptiaRtiaSel = LPTIARTIA_512K; /* Tia gain resistor is 512kohm */
Output for the CH0 is correct and the sensor seems to respond to humidity / temperature changes, however CH1 seems to be unresponsive (Picture 2 below). Looking at the Calibrated Rtia could show the reason why is that, but I am not sure what is causing the calibration for channel 1 be so low and differ that much from channel 0.
Any help or guidance would be appreciated.
Picture 1. Jumpers for 4-electrode connection
Picture 2. Eval board output for M355_ECSns_DualWE example