ADS4229IRGC25 datasheet(21/67 Pages) TI1

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SDATA

SCLK

SEN

a)Enableserialreadout(READOUT=1)

SDATA

SCLK

SEN

SDOUT

b)ReadcontentsofRegister45h.Thisregisterhasbeeninitializedwith04h(deviceisputintoglobalpower-downmode.)

SDOUT

RegisterAddressA[7:0]=00h

RegisterDataD[7:0]=01h

RegisterAddressA[7:0]=45h

RegisterDataD[7:0]=XX(don’tcare)

TheSDOUTpinisinhigh-impedancestate.

TheSDOUTpinfunctionsasserialreadout(READOUT=1).

ADS4229

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SBAS550B – JUNE 2011 – REVISED AUGUST 2012

Serial Register Readout

The device includes a mode where the contents of the internal registers can be read back. This readback mode

may be useful as a diagnostic check to verify the serial interface communication between the external controller

and the ADC. To use readback mode, follow this procedure:

1. Set the READOUT register bit to '1'. This setting disables any further writes to the registers.

2. Initiate a serial interface cycle specifying the address of the register (A7 to A0) whose content has to be

read.

3. The device outputs the contents (D7 to D0) of the selected register on the SDOUT pin (pin 64).

4. The external controller can latch the contents at the SCLK falling edge.

5. To enable register writes, reset the READOUT register bit to '0'.

The serial register readout works with both CMOS and LVDS interfaces on pin 64. See Figure 11 for serial

readout timing diagram.

When READOUT is disabled, the SDOUT pin is in high-impedance state.

Figure 11. Serial Readout Timing Diagram

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ADS4229IRGC25 Datasheet(PDF) 21 Page - Texas Instruments