AD7992 datasheet(17/29 Pages) AD

17 / 29 page

AD7992

Rev. 0 | Page 16 of 28

INTERNAL REGISTER STRUCTURE

The AD7992 contains 11 internal registers (see Figure 24) that

are used to store conversion results, high and low conversion

limits, and information to configure and control the device.

There are ten data registers and one address pointer register.

CONVERSION

RESULT REGISTER

ALERT STATUS

CYCLE TIMER

HYSTERESIS

CONFIGURATION

DATALOW

DATAHIGH

ADDRESS

POINTER

SERIAL BUS INTERFACE

SDA

SCL

Figure 24. AD7992 Register Structure

Each data register has an address that the address pointer

result register is the only data register that is read-only.

ADDRESS POINTER REGISTER

Because it is the register to which the first data byte of every

write operation is written automatically, the address pointer

address pointer register is an 8-bit register in which the 4 LSBs

are used as pointer bits to store an address that points to one of

the AD7992’s data registers. The 4 MSBs are used as command

bits when operating in Mode 2 (see the Modes of Operation

section). The first byte following each write address is the

address of one of the data registers, which is stored in the

address pointer register and selects the data register to which

subsequent data bytes are written. Only the 4 LSBs of this

address pointer register contains all 0s, pointing to the

conversion result register.

Table 7. Address Pointer Register

Table 8. AD7992 Register Addresses

Registers

Conversion result register (read)

Alert status register (read/write)

Configuration register (read/write)

Cycle Timer register (read/write)

DATALOW register CH1 (read/write)

DATAHIGH register CH1 (read/write)

Hysteresis register CH1 (read/write)

DATALOW register CH2 (read/write)

DATAHIGH register CH2 (read/write)

Hysteresis register CH2 (read/write)

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