AD2S1210_FAULT

Question

Hi experts, 
 Currently, I am using the EVAL AD2S1210 with SPI communication. But, I have some problem. 
 + The LOT and DOS Led always run even resolver connected. I read the fault register, Its value is 0x7F. 
 + I used the 12 bits data mode. But the value of angular position always is 11 bits. The MSB is 0. 
 Could you tell me how I can fix these problems? 
 I appreciate any your helps.

@skowalik · Accepted Answer

CauT2, 
 First of all apologies for the delay in my response as I was out of the office on vacation. As you have stated that LOT and DOS are always lit and that you are reading back all 1's from the device I'm suspicious that you have either 1) Miswired the device 2) you've misconfigured the device, or 3) the device is not correctly biased or has somehow been damaged. 
 To start debug can you please confirm the following. 
 1) You have modified the board to change LK9 to put SOEN = DGND (Position B) 
 2) Please also verify that you've tied RDB to VDRIVE by connecting LK3 to Position B. 
 3) Please verify the RESET pin is at VDRIVE, note that VDRIVE must be >3.08V (typ), 3.15V(max) for the onboard ADM811 device to release the reset. 
 4) Please confirm you have connected the following pins to your controller using either J2 or J4.

Device Pin 
 Function 
 Linker 
 Position 
 Micro Pin

A0 
 Configuration Selection 
 LK4 
 C 
 GPIO

A1 
 Configuration Selection 
 LK5 
 C 
 GPIO

CS 
 Chip Select 
 LK2 
 B or C 
 If tied to C use GPIO. This is a global chip enable.

SAMPLE 
 Sample Access Pin 
 LK1 
 C 
 GPIO (TIMER Capable)

WR/FSYNC 
 Interface Frame Sync 
 NA 
 NA 
 J4-4 Connected to SS or GPIO

DB13/SCLK 
 Serial Interface Clock 
 NA 
 NA 
 J4-10 Connected to SCLK

DB14/SDI 
 Serial Data Input 
 NA 
 NA 
 J4-9 Connected to controller MOSI or equivalent

DB15/SDO 
 Serial Data Output 
 NA 
 NA 
 J4-8 Connected to controller MISO or equivalent

If you've verified all these connections and found them to be satisfactory please let me know and we can continue debug from there. 
 Sean)

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AD2S1210_FAULT