ADC3683 datasheet(43/70 Pages) TI1

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7.5.2.1 Register Write

The internal registers can be programmed following these steps:

1. Drive the SEN pin low

2. Set the R/W bit to 0 (bit A15 of the 16-bit address) and bits A[14:12] in address field to 0.

3. Initiate a serial interface cycle by specifying the address of the register (A[11:0]) whose content is written and

4. Write the 8-bit data that are latched in on the SCLK rising edges

Figure 7-48 shows the timing requirements for the serial register write operation.

SDIO

SCLK

tSCLK

tS,SDIO

tH,SDIO

SEN

tS,SEN

tH,SEN

RESET

A11

A10

R/W

Figure 7-48. Serial Register Write Timing Diagram

7.5.2.2 Register Read

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

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

the external controller and the ADC. The procedure to read the contents of the serial registers is as follows:

1. Drive the SEN pin low

2. Set the R/W bit (A15) to 1. This setting disables any further writes to the registers. Set A[14:12] in address

field to 0.

3. Initiate a serial interface cycle specifying the address of the register (A[11:0]) whose content must be read

4. The device launches the contents (D[7:0]) of the selected register on the SDIO pin on SCLK falling edge

5. The external controller can capture the contents on the SCLK rising edge

SDIO

SCLK

SEN

A11

A10

R/W

OZD

ODZ

Figure 7-49. Serial Register Read Timing Diagram

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ADC3683-SP

SBASAB5 – MARCH 2024

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