Hello,
We build the new version of PCB for ADS1298 with reference of sbau171d document of TI. We currently communicate ADS1298 with Raspberry Pi.
But we only get the lead 2 graph. some time we get V4 with lead 2. Please Help.
The Resistor logs are as per following
All values are in Hex.
Device type 146
LOFF 0X3
CONFIG3 0Xdc
GPIO read 0X0
CONFIG1 0X85
CONFIG2 0X10
CONFIG4 0X2
RLD_SENSP 0X0
RLD_SENSN 0X0
WCT1 0Xa
WCT2 0Xe3
LOFF_SENSP 0Xff
LOFF_SENSN 0X2
PACE 0X0
RESP 0X0
LOFF FLIP 0X0
LOFF_STATP 0X0
LOFF_STATN 0X0
CH1SET 0X0
CH2SET 0X0
CH3SET 0X0
CH4SET 0X0
CH5SET 0X0
CH6SET 0X0
CH7SET 0X0
CH8SET 0X0
Here are the voltages of some test points
-
VSSA -2.5V (w.r.t. GND)
-
VDD +3.3V (w.r.t. GND)
-
VrefP 0.88mV (w.r.t. GND)
-
VrefP 2.042 (w.r.t. VSSA)
-
VerfN -2.5V (w.r.t. GND)
-
VCAP1 -1.228v (w.r.t. GND)
-
VCAP1 1.198v (w.r.t. VSSA)
-
VCAP2 0.37V (w.r.t. GND)
-
VCAP2 2.52V (w.r.t. VSSA)
-
VCAP3 4.43V (w.r.t. GND)
-
VCAP3 6.91V (w.r.t. VSSA)
-
VCAP4 -1.284 (w.r.t. GND)
-
VCAP4 1.20 (w.r.t. VSSA)
- VDDA +2.5 (w.r.t. GND)