DS90UB954-Q1: can't access remote serializer in a long chain 953/954 connection

Hello Xingzhu,

We will need a couple days to check on this configuration before we respond back. Are you operating all of these devices in synchronous mode?

Best Regards,

Casey 

Hello Casey,

          Yes, all 954 and 953 are designed and set as synchronous mode.

Best regards

Hello Hamzeh,

      sorry for late reply. Firstly, I would apologize for the i2c address problem in previous comment, here is the correct:

      note: 953(A) is 0x19, 953(B) is 0x18

     And yes, I follow the setting as you told me in the comment(change address and alias as picture above), the 953(B) and sensor can't be accessed from main board.

here is my setting read from 954(A):     

0x58[6]=1 for Pass-throu enabled, is 0x5e
0x5B: SER ID = will be recognized by DES, is 0x32(8bit)
0x5C = 0x08 /953(A) alias 0x08(8bit)
0x5D = 0x7a //954(B) is treated as slave for 954(A), is 0x7a(8bit)
0x5E = 0x30 //953(B) is
0x5f = 0x50 //sensor address 0xA0(8bit), 0x50(7bit)
0x65 = 0x80 //954(B) alias is 0x80(8bit)
0x66 = 0x40 //953(B) alias is 0x40(8bit)

setting read from 953(A):

0x32 = 0x09 //this is the default value, we don't enable 954(A) Pass-through as you told

setting read from 954 (B):

0x58[6]=1 for Pass-throu enabled, is 0x5e
0x5B: SER ID = will be recognized by DES , is 0x30(8bit)
0x5C = 0x40 //alis for 953(B)
0x5D = 0xA0 //sensor address 0xA0(8bit), 0x50(7bit)
0x65 = 0xA0 //sensor alias 0xA0(8bit)

As you told in this thread and the other thread, here is my understanding for this long chain setting, correct me if I am wrong:

1. For 954(A), 954(B)\953(B)\sensor are the slaves, so We need set slave address corresponding to the three devices, Is it right?

2. For 953(A), there is not need to enable pass-through, becuase all the i2c to 954(A)'s slave is automatically pass to the slaves, Is it right?

After these setting, 953(B) and sensor are still not accessible from main board.  Any problem for these settings?

953(A) and 954(B) are accessible from main board.

Best regards

Hello Hamzeh,

        We set 954(B)'s register 0x58 = 0xde, all i2c to sensor and 953(B) are ok.

        But we are not sure why this happens, any ideal why "I2C Pass-Through All Transactions" should be enabled?

Best regards