COMBOSMARTMETER datasheet(30/60 Pages) TI1

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START1

Device

CLK

DRDY

START

CLK

START2

Device

CLK

DRDY

START

CLK

DRDY1

DRDY2

ADS131E04

ADS131E06

ADS131E08

SBAS561A – JUNE 2012 – REVISED APRIL 2013

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MULTIPLE DEVICE CONFIGURATION

The ADS131E0x are designed to provide configuration flexibility when multiple devices are used in a system.

The serial interface typically needs four signals: DIN, DOUT, SCLK, and CS. With one additional chip select

signal per device, multiple devices can be connected together. The number of signals needed to interface n

devices is 3 + n.

To use the internal oscillator in a daisy-chain configuration, one device must be set as the master for the clock

source with the internal oscillator enabled (CLKSEL pin = 1) and the internal oscillator clock brought out of the

device by setting the CLK_EN register bit to '1'. This master device clock is used as the external clock source for

the other devices.

When using multiple devices, the devices can be synchronized with the START signal. The delay from START to

the DRDY signal is fixed for a fixed data rate (see the START subsection of the SPI Interface section for more

details on the settling times). Figure 36 shows the behavior of two devices when synchronized with the START

signal.

There are two ways to connect multiple devices with an optimal number of interface pins: standard mode and

daisy-chain mode. Refer to the Standard Mode and Daisy-Chain Mode sections for details.

Figure 36. Synchronizing Multiple Converters

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Product Folder Links: ADS131E04 ADS131E06 ADS131E08

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