ADC3421 datasheet(48/80 Pages) TI2

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R/W

A13

A12

A11

SDATA

SCLK

tSCLK

tDSU

tDH

SEN

tSLOADS

tSLOADH

RESET

= 0

ADC3421, ADC3422, ADC3423, ADC3424

SBAS673A – JULY 2014 – REVISED OCTOBER 2015

www.ti.com

Programming (continued)

9.5.1.1 Register Initialization

After power-up, the internal registers must be initialized to their default values through a hardware reset by

applying a high pulse on the RESET pin (of durations greater than 10 ns), as shown in Figure 143. If required,

the serial interface registers can be cleared during operation either:

1. Through a hardware reset, or

2. By applying a software reset. When using the serial interface, set the RESET bit (D0 in register address 06h)

high. This setting initializes the internal registers to the default values and then self-resets the RESET bit low.

In this case, the RESET pin is kept low.

9.5.1.1.1

Serial Register Write

The device internal register can be programmed with these steps:

1. Drive the SEN pin low,

2. Set the R/W bit to 0 (bit A15 of the 16-bit address),

3. Set bit A14 in the address field to 1,

4. Initiate a serial interface cycle by specifying the address of the register (A13 to A0) whose content must be

written, and

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

Figure 143 and Table 6 show the timing requirements for the serial register write operation.

Figure 143. Serial Register Write Timing Diagram

Table 6. Serial Interface Timing(1)

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, full temperature range is from TMIN = –40°C to TMAX = 85°C, and AVDD = DVDD = 1.8 V, unless otherwise

noted.

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