ADS9316 datasheet(32/70 Pages) TI2

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6.4 Device Functional Modes

6.4.1 Reset

Reset the ADS931x by writing 1b to the RESET field in address 0x01. The device registers are initialized to the

default values after reset.

6.4.2 Normal Operation

In normal operating mode, the ADS931x is powered up and digitizes sample N on the falling edge of CONVST.

Data corresponding to sample N − 1 is launched on the digital interface on the falling edge of CS as illustrated in

Figure 5-2.

6.4.3 Low-Latency Mode

In low-latency mode, the conversion for sample N starts on the falling edge of CONVST. Data corresponding

to sample N are launched on the digital interface on the falling edge of CS. As illustrated in Figure 5-3, the

host provides a minimum time of tCONV + tLOW_LAT between the falling edges of CONVST and CS. To enter

low-latency mode, write 1b to LATENCY_MODE in address 0x09.

6.4.4 CS-CONVST Short Mode

In CS-CONVST short mode, tie CS and CONVST together externally. As illustrated in Figure 5-4, the ADS931x

digitizes sample N on the falling edge of CONVST. Data corresponding to sample N − 1 are launched on the

digital interface on the falling edge of CS. CS-CONVST short mode is supported by default and creates a 5ns

internal delay between the falling edge of CONVST and CS. The internal delay between CONVST and CS is

disabled by writing 1b to CSZ_CONVST_DELAY_DIS in address 0x13.

6.4.5 Register Read Mode

In register read mode, the device launches the requested device register data on D3. To enter register read

mode, set DATA_SEL = 1b as described in the Register Read section.

6.4.6 Initialization Sequence

The ADS931x is designed to support a wide range of signal input common-modes. To set the voltage output

common-mode on external circuits, the device provides a voltage output on the VCMOUT pin, which matches

the expected input common-mode of the device. If the input signal common-mode is equal to the default

VCMOUT (VCMOUT_SEL = 0b), no initialization sequence is required.

If the input signal common-mode is set to a value other than the default VCMOUT, program the VCMOUT_SEL

CONVST. Table 6-9 shows the steps to initialize the device if the input signal common-mode does not match the

default value of VCMOUT.

Table 6-9. ADS931x Initialization Sequence

STEP NUMBER

DESCRIPTION

Unlock the register map.

Select the value of VCMOUT by writing to VCMOUT_SEL.

Lock the register map.

Provide 800 cycles of CONVST.

ADS9316, ADS9317

SBASAX4 – JUNE 2026

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