ADS5295IPFP datasheet(29/93 Pages) TI2

29 / 93 page

SDATA

SCLK

b) Read contents of register 0Fh. This register is initialized with 0200 (the device was previously put in global power-down).

SDOUT

SDOUT outputs the contents of register 0Fh in the same cycle, MSB first.

D15

D14

D13

D12

D11

D10

SDATA

SCLK

a) Enable Serial Readout (READOUT = 1)

SDOUT

The SDOUT Pin is in 3-State

The SDOUT pin becomes active and is forced low.

ADS5295

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SBAS595 – DECEMBER 2012

Serial Register Readout

The device includes a mode where the contents of the internal registers can be read back on the SDOUT pin.

This readback mode may be useful as a diagnostic check to verify the serial interface communication between

the external controller and the ADC.

By default, the SDOUT pin is in 3-state after a device power-up or reset. When the readout mode is enabled

using the READOUT register bit, SDOUT serially outputs the contents of the selected register. The following

steps describe how to achieve this functionality:

1. Set the READOUT register bit to '1'. This setting puts the device in serial readout mode. This mode prevents

any further writes to the internal registers, except for at register 01h. Note that the READOUT bit is also

located in register 01h. The device can exit readout mode by setting the READOUT bit to '0'. Note that only

the contents of register 01h are unable to be read in register readout mode.

2. Initiate a serial interface cycle specifying the address of the register (A[7:0]) whose content must be read.

3. The device serially outputs the contents (D[15:0]) of the selected register on the SDOUT pin.

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

To exit serial readout mode, reset the READOUT register bit to '0', which enables writes to all device registers. At

this point, the SDOUT pin is in 3-state. A detailed timing diagram for the serial readout mode is shown in

Figure 45.

Figure 45. Serial Readout Timing Diagram

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ADS5295IPFP Datasheet(PDF) 29 Page - Texas Instruments