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6.5 Programming

6.5.1 Register Write

three register banks and are addressable with an 8-bit register address. Select register bank 1 and register bank

2 for read or write operation by configuring the PAGE_SEL0 and PAGE_SEL1 bits, respectively. Registers in

bank 0 are always accessible, irrespective of the PAGE_SELx bits. These register addresses are unique and are

therefore not used in register banks 1 and 2.

As shown in Figure 6-9, steps to write to a register are:

1. Frame 1: Write to register address 0x03 in register bank 0 to select either register bank 1 or bank 2 for a

subsequent register write. This frame has no effect when writing to registers in bank 0.

2. Frame 2: Write to the register in the bank selected in frame 1. Repeat this step for writing to multiple

registers in the same register bank.

24-bits

SCLK

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

0x0010 }

Not Required for Register Bank 0

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

SDI

Logic 0 (when SPI_MODE = 0b) and Hi-Z (when SPI_MODE = 1b)

SDO

Frame 1

Frame 2

Figure 6-9. Register Write

6.5.2 Register Read

Select the desired register bank by writing to register address 0x03 in register bank 0. Register read access is

enabled by setting SPI_RD_EN = 1b and SPI_MODE = 1b in register bank 0. As illustrated in Figure 6-10, read

registers by using two 24-bit SPI frames after the SPI_RD_EN and SPI_MODE bits are set. The first SPI frame

selects the register bank. The ADC returns the 16-bit register value in the second SPI frame corresponding to

the 8-bit register address.

As illustrated in Figure 6-10, the steps to read a register are:

1. Frame 1: With SPI_RD_EN = 0b, write to register address 0x03 in register bank 0 to select the desired

2. Frame 2: Set SPI_RD_EN = 1b and SPI_MODE = 1b in register address 0x00 in register bank 0.

3. Frame 3: Read any register in the selected bank using a 24-bit SPI frame containing the desired register

address. Repeat this step with the address of any register in the selected bank to read the corresponding

4. Frame 4: Set SPI_RD_EN = 0 to disable register read and re-enable register writes.

5. Repeat steps 1 through 4 to read registers in a different bank.

ADS9813

SBASAQ6 – APRIL 2024

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