COMBOSMARTMETER datasheet(31/60 Pages) TI1

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START

DRDY

SCLK

DIN

ADS13xE0x

(Device 0)

START

DRDY

SCLK

DIN

ADS13xE0x

(Device 1)

START(1)

a) Standard Configuration

CLK

INT

GPO0

GPO1

SCLK

MOSI

Host Processor

MISO

CLK

START

DRDY

SCLK

DIN

ADS13xE0x

(Device 0)

START

DRDY

SCLK

DIN

ADS13xE0x

(Device 1)

b) Daisy-Chain Configuration

CLK

INT

GPO

SCLK

MOSI

Host Processor

MISO

CLK

DOUT

START(1)

DOUT0

DOUT1

DAISY_IN0

DAISY_IN1

DOUT0

ADS131E04

ADS131E06

ADS131E08

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SBAS561A – JUNE 2012 – REVISED APRIL 2013

Standard Mode

Figure 37a shows a configuration with two devices cascaded together. Both devices are an ADS131E0x (eight-

channel) device. Together, they create a system with 16 channels. DOUT, SCLK, and DIN are shared. Each

device has its own chip select. When a device is not selected by the corresponding CS being driven to logic 1,

the DOUT of this device is high-impedance. This structure allows the other device to take control of the DOUT

bus. This configuration method is suitable for the majority of applications.

Daisy-Chain Mode

Daisy-chain mode is enabled by setting the DAISY_IN bit in the CONFIG1 register. Figure 37b shows the daisy-

chain configuration. In this mode SCLK, DIN, and CS are shared across multiple devices. The DOUT pin of

device 1 is connected to the DAISY_IN of device 0, thereby creating a daisy-chain for the data. One extra SCLK

must be issued between each data set. Also, when using daisy-chain mode, the multiple readback feature is not

available. Short the DAISY_IN pin to digital ground if not used. Figure 2 describes the required ADS131E0x

timing shown in Figure 37. Data from the ADS131E0x appear first on DOUT, followed by a don’t care bit, and

finally by the status and data words from the second ADS131E0x device.

When all devices in the chain operate in the same register setting, DIN can be shared as well and thereby

reduce the SPI communication signals to four, regardless of the number of devices. Furthermore, an external

clock must be used.

(1) To reduce pin count, set the START pin low and use the START serial command to synchronize and start conversions.

Figure 37. Multiple Device Configurations

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Product Folder Links: ADS131E04 ADS131E06 ADS131E08

COMBOSMARTMETER Datasheet(PDF) 31 Page - Texas Instruments

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