ADS54J20 datasheet(39/117 Pages) TI2

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8.4.2.3 Serial Register Readout: Analog Bank

The content from one of the two analog banks can be read out by:

1. Driving the SEN pin low.

2. Selecting the page address of the register whose content must be read.

• Master page: write address 0011h with 80h.

• ADC page: write address 0011h with 0Fh.

3. Setting the R/W bit to 1 and writing the address to be read back.

4. Reading back the register content on the SDOUT pin, as shown in Figure 8-14. When a page is selected,

multiple read backs from the same page can be done. SDOUT comes out at the SCLK falling edge with an

approximate delay (tSD_DELAY) of 68 ns; see Figure 8-18.

R/W

SDIN

SCLK

SEN

RESET

A11

A10

SDOUT

SDOUT[7:0]

Figure 8-14. Serial Register Read Timing Diagram

8.4.2.4 JESD Bank SPI Page Selection

The JESD SPI bank contains four pages (main digital, JESD digital, and JESD analog pages). The individual

pages can be selected by:

1. Driving the SEN pin low.

2. Setting the M bit to 1 and specifying the page with two register writes. Note that the P bit must be set to 0, as

shown in Figure 8-15.

• Write address 4003h with 00h (LSB byte of the page address).

• Write address 4004h with the MSB byte of the page address.

– For the main digital page: write address 4004h with 68h.

– For the JESD digital page: write address 4004h with 69h.

– For the JESD analog page: write address 4004h with 6Ah.

R/W

SDIN

SCLK

SEN

RESET

A11

A10

Figure 8-15. SPI Page Selection

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ADS54J40

SBAS714C – MAY 2015 – REVISED DECEMBER 2020

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