AD7293 datasheet(32/78 Pages) AD

32 / 78 page

AD7293

Data Sheet

Rev. B | Page 32 of 78

REGISTERS COMMON TO ALL PAGES

A number of registers is common to all pages. The register

function is the same for all pages.

No Op Register (Register 0x00)

The no op register does not physically exist and this address

space is reserved to prevent any writes to the device when the

input data line is held low.

Page Select Pointer Register (Register 0x01)

This 8-bit pointer register selects the page that the user is trying

to access. A read of this register indicates the page the user is

currently pointing to. The two MSBs are reserved and the six

LSBs can be written to select any of the pages.

Conversion Command (Register 0x02)

The conversion command register is a special 8-bit register used

to initiate a conversion. To command a conversion, write the

command register address to the device with the MSB read bit

set. When the device address pointer register receives a special

conversion command, the previous contents of the address pointer

are retained and used to determine which channel to convert. If

pointing to the sequence register, the next channel in the sequence

converts.

Result Register (Register 0x03)

The 16-bit, read only ADC data register provides read access to

the most recent ADC conversion result in command mode.

Otherwise, it is necessary for the application software to keep

track of what channel was converted.

DAC Enable Register (Register 0x04)

This 8-bit register enables the DACs. See Table 20.

GPIO Register (Register 0x05)

This 8-bit register configures the GPIOs in the device. In GPIO

mode, and with the output drivers enabled, the GPIO outputs

reflect the value written to this register. In functional mode, any

write to this register has no effect on the GPIO outputs. The status

(high/low) of the GPIO pins can be read back by reading this

Device ID Register (Register 0x0C)

This 16-bit read-only register stores the Device ID assigned to

Analog Devices, Inc. See Table 22 for more information.

Software Reset Register (Register 0x0F)

To issue a software reset write a specific value, 0x7293, to this

16-bit register and pull CS high. The user must write 0x0000 to

this register to clear it following the software reset. See Table 23.

Table 20. DAC Enable Register

Bit Number(s)

Bit Name

Description

BI-VOUT3

0: disable.

1: enable.

BI-VOUT2

0: disable.

1: enable.

BI-VOUT1

0: disable.

1: enable.

BI-VOUT0

0: disable.

1: enable.

UNI-VOUT3

0: disable.

1: enable.

UNI-VOUT2

0: disable.

1: enable.

UNI-VOUT1

0: disable.

1: enable.

UNI-VOUT0

0: disable.

1: enable.

Table 21. GPIO Register

Bit Number(s)

Bit Name

Description

GPIO7

0: disable.

1: enable.

GPIO6

0: disable.

1: enable.

GPIO5

0: disable.

1: enable.

GPIO4

0: disable.

1: enable.

GPIO3

0: disable.

1: enable.

GPIO2

0: disable.

1: enable.

GPIO1

0: disable.

1: enable.

GPIO0

0: disable.

1: enable.

Table 22. Device ID Register

Bit Number(s)

Bit Name

Description

[15:0]

ID register

Analog Devices,

Device ID = 0x0018

Table 23. Software Reset Register

Bit Number(s)

Bit Name

Description

[15:0]

Reset register

Software reset =

0x7293

AD7293 Datasheet(PDF) 32 Page - Analog Devices

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