ADS7066 datasheet(22/48 Pages) TI

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7.3.10.2 Daisy-Chain Mode

The ADS7066 can operate as a single converter or in a system with multiple converters. System designers

can take advantage of the simple, high-speed, enhanced-SPI serial interface by cascading converters in a

daisy-chain configuration when multiple converters are used. No register configuration is required to enable

daisy-chain mode. Figure 7-7 shows a typical connection of three converters in daisy-chain mode.

ADS7066

(ADC C)

SDO

SDI

SCLK

ADS7066

(ADC B)

SDO

SDI

SCLK

ADS7066

(ADC A)

SDO

SDI

SCLK

Host

MISO

MOSI

SCLK

Figure 7-7. Multiple Converters Connected Using Daisy-Chain Mode

When the ADS7066 is connected in daisy-chain mode, the serial input data passes through the ADS7066 with a

24-SCLK delay, as long as CS is active. Figure 7-8 shows a detailed timing diagram of this mode. In Figure 7-8,

the conversion in each converter is performed simultaneously.

SCLK

Sample ADC A

Sample ADC B

Sample ADC C

tCONV

ADC C

ADC B

ADC A

MISO

DIN for

ADC C

MOSI

DIN for

ADC B

DIN for

ADC A

Figure 7-8. Simplified Daisy-Chain Mode Timing

The ADS7066 supports daisy-chain mode for output data payloads up to 24 bits long; see the Output Data

Format section for more details. If either the status flags or channel ID are appended (APPEND_STATUS ≠ 00b)

and the CRC module is enabled (CRC_EN = 1b), then the serial input data does not pass through the ADS7066

and daisy-chain mode is disabled.

ADS7066

SBAS928B – FEBRUARY 2020 – REVISED MAY 2023

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