ADS42LB49 datasheet(35/70 Pages) TI

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R/W

SDATA

SCLK

tSCLK

tDSU

tDH

SEN

tSLOADS

tSLOADH

RESET

= 0

ADS42JB49

ADS42JB69

www.ti.com

SLAS900C – OCTOBER 2012 – REVISED JULY 2013

Serial Register Write

The internal device register can be programmed following these steps:

1. Drive the SEN pin low.

2. Set the R/W bit to ‘0’ (bit A7 of the 8-bit address).

3. Set bit A6 in the address field to ‘0’.

4. Initiate a serial interface cycle specifying the address of the register (A5 to A0) whose content must be

written (as shown in Figure 79 and Table 4).

5. Write the 8-bit data that is latched on the SCLK rising edge.

Figure 79. Serial Register Write Timing Diagram

Table 4. Serial Interface Timing(1)

PARAMETER

MIN

TYP

MAX

UNIT

fSCLK

SCLK frequency (equal to 1 / tSCLK)

> dc

MHz

tSLOADS

SEN to SCLK setup time

tSLOADH

SCLK to SEN hold time

tDSU

SDIO setup time

tDH

SDIO hold time

(1)

Typical values are at +25°C, minimum and maximum values are across the full temperature range of TMIN = –40°C to TMAX = +85°C,

AVDD3V = 3.3 V, and AVDD = DRVDD = IOVDD = 1.8 V, unless otherwise noted.

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.

1. Set bit A7 (MSB) of 8 bit address to '1'.

2. Write the address of register on bits A5 through A0 whose contents must be read. See Figure 80

3. The device outputs the contents (D7 to D0) of the selected register on the SDOUT pin (pin 45).

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

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