ADS5295IPFP datasheet(27/93 Pages) TI2

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SDATA

SCLK

SLOADS

SLOADH

SCLK

DSU

RESET

D15

D14

D13

D12

D11

D10

ADS5295

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SBAS595 – DECEMBER 2012

DEVICE CONFIGURATION

SERIAL INTERFACE

The ADC has a set of internal registers that can be accessed by the serial interface formed by the CS (serial

interface enable), SCLK (serial interface clock), and SDATA (serial interface data) pins. Serially shifting bits into

the device is enabled when CS is low. The serial data (on the SDATA pin) are latched at every SCLK falling

edge when CS is active (low). The serial data are loaded into the register at every 24th SCLK rising edge when

CS is low. When the word length exceeds a multiple of 24 bits, the excess bits are ignored. Data can be loaded

in multiples of 24-bit words within a single active CS pulse. The first eight bits form the register address and the

remaining 16 bits are the register data. The interface can function with SCLK frequencies from 15 MHz down to

very low speeds (of a few hertz) and also with a non-50% SCLK duty cycle.

After power-up, the internal registers must be initialized to default values. This initialization can be accomplished

in one of two ways:

1. Either through a hardware reset by applying a high pulse on the RESET pin (of widths greater than 10 ns),

as shown in Figure 43; or

2. By applying a software reset. When using the serial interface, set the RESET bit (register 00h, bit D7) high.

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

case, the RESET pin is kept low (inactive).

Figure 43. Serial Interface Timing Diagram

Table 5. Timing Characteristics for Figure 43(1)

PARAMETER

MIN

TYP

MAX

UNIT

fSCLK

SCLK frequency (equal to 1 / tSCLK)

>dc

MHz

tSLOADS

CS to SCLK setup time

tSLOADH

SCLK to CS hold time

tDSU

SDATA setup time

tDH

SDATA hold time

(1)

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

+85°C, unless otherwise noted.

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