ADS131M04-Q1
ZHCSOL7A –MARCH 2022 –REVISED AUGUST 2022
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9.1.4 Multiple Device Configuration
Multiple ADS131M04-Q1 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. 图 9-3 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.
Device 1
SYNC/RESET
CLKIN
DRDY
SCLK
GPIO
CLKOUT
IRQ
SCLK
MOSI
MISO
CS1
MCU
DIN
DOUT
CS
CS2
CSn
Device 2
SYNC/RESET
CLKIN
DRDY
SCLK
DIN
DOUT
CS
Device n
SYNC/RESET
CLKIN
DRDY
SCLK
DIN
DOUT
CS
图9-3. Multiple Device Configuration
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