ADS131M08IPBSR datasheet(92/118 Pages) TI2

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9.1.5 Multiple Device Configuration

Multiple ADS131M08 devices can be arranged to capture all signals simultaneously. The same clock must be

provided to all devices and the SYNC/RESET pins must be strobed simultaneously at least one time to align the

sample periods internally between devices. The phase settings of each device can be changed uniquely, but the

host must take care to record which channel in the group of devices represents the zero phase.

The devices can also share the SPI bus where only the CS pins for each device are unique. Each device can be

addressed sequentially by asserting CS for the device that the host wishes to communicate with. The DOUT pin

remains high impedance when the CS pin is high, allowing the DOUT lines to be shared between devices as

long as no two devices sharing the bus simultaneously have their CS pins low. Figure 9-4 shows multiple

devices configured for simultaneous data acquisition while sharing the SPI bus.

Monitoring the DRDY output of only one of the devices is sufficient because all devices convert simultaneously.

CLKOUT

IRQ

SCLK

MOSI

CS1

MCU

GPIO

CS2

MISO

CSn

SYNC/RESET

CLKIN

DRDY

SCLK

DIN

DOUT

Device 1

SYNC/RESET

CLKIN

DRDY

SCLK

DIN

DOUT

Device 2

SYNC/RESET

CLKIN

DRDY

SCLK

DIN

DOUT

Device n

Figure 9-4. Multiple Device Configuration

ADS131M08

SBAS950B – OCTOBER 2019 – REVISED FEBRUARY 2021

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ADS131M08IPBSR Datenblatt(PDF) 92 Page - Texas Instruments

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