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ADS1194: WREG register addressing and startup

Part Number: ADS1194

1 - Datasheet says that WREG has 4 r bits for specifying the address. But there are 20 registers. How can I address 20 registers with 4 bits?!

2 - According to Figure. 58, upon starting the chip with START=1 and using internal clock, prior to Reset, DRDY should toggle at 2.048MHz/16384=125Hz, but mine toggles at 1KHz or sometimes 500Hz. Is this a problem ?

3- Before I send a command to ADS1194, the DOUT signal is High and DRDY is toggling at 1KHz, After sending the STOP command, DOUT starts toggling exactly like DRDY! With 1 ms peiod where it's high for ~2us. So the chip doesn't respond to command.

  • Hello Arash,

    1. The command uses five bits for address on page 35, you can see the breakout of the bits as 010r rrrr 000n nnnn. in parentheses it reads 4xh which is misleading. It could be 5xh if the address > 0Fh.
    2. I believe this part of the flow chart is wrong. In any case it does not matter. After reset, it should toggle at 500 Hz due to the default settings in the CONFIG1 register.
    3. Is the START pin still high? The device will ignore the STOP command when the START pin is held high.

    Regards,

    Brian