ADS9813 datasheet(34/66 Pages) TI

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24-bits

SCLK

{ addr[23:16] = 0x03, data[15:0] = 0x0002 or

0x0010 }

Not Required for Register Bank 0

{ addr[23:16] = 0x00, data[15:0] = 0x0006 }

{ addr[23:16] = REG_ADDR, data[15:0] = 0 }

{ addr[23:16] = 0x00, data[15:0] = 0x0004 }

SDI

16-bit Register Data

Hi-Z (when SPI_MODE = 1b)

Logic 0 (when SPI_MODE = 0b)

SDO

Frame 1

Frame 2

Frame 3

Frame 4

Figure 6-12. Register Read

6.5.3 Multiple Devices in a Daisy-Chain Topology for SPI Configuration

Figure 6-13 shows a typical connection diagram with multiple devices in a daisy-chain topology.

24-bit

ADS98XX

ADC1

SDI

SDO

24-bit

ADS98XX

ADC2

SDI

SDO

24-bit

ADS98XX

ADC3

SDI

SDO

24-bit

ADS98XX

ADC4

SDI

SDO

PICO

POCI

SCLK

HOST

SCLK

Figure 6-13. Daisy-Chain Connections for Configuration SPI

The CS and SCLK inputs of all ADCs are connected together and controlled by a single CS and SCLK pin of

the controller, respectively. The SDI input pin of the first ADC in the chain (ADC1) is connected to the peripheral

IN controller OUT (PICO) pin of the controller. Then, the SDO output pin of ADC1 is connected to the SDI input

pin of ADC2, and so on. The SDO output pin of the last ADC in the chain (ADC4) is connected to the peripheral

OUT controller IN (POCI) pin of the controller. The data on the PICO pin passes through ADC1 with a 24-SCLK

delay, as long as CS is active.

Enable daisy-chain after power-up or after the device is reset. Set the daisy-chain length in the

DAISY_CHAIN_LEN register to enable daisy-chain mode. The daisy-chain length is the number of ADCs in

the chain excluding ADC1. In Figure 6-13, the DAISY_CHAIN_LEN is 3.

ADS9813, ADS9811, ADS9810

SBASAQ6A – JULY 2024 – REVISED NOVEMBER 2024

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