AD5593R

Data Sheet

Rev. B | Page 24 of 33

GENERAL-PURPOSE CONTROL REGISTER

The general-purpose control register enables or disables certain

functions associated with the DAC, ADC, and I/O pin configura-

tion (see Table 13). The register sets the output range of the

DAC and input range of the ADC, which sets their transfer

functions, enables/disables the ADC buffer, and enables the

precharge function (see the ADC Section for more details). The

register is also used to lock the I/O pin configuration to prevent

accidental change. When Bit D7 is set to 1, writes to the

configuration registers are ignored.

Table 11. Control Registers

Pointer Byte

[D7:D0]

Register Name

Description

Default Value

00000000

NOP

No operation

0x0000

00000010

ADC sequence register

Selects ADCs for conversion

0x0000

00000011

General-purpose control register

DAC and ADC control register

0x0000

00000100

ADC pin configuration

Selects which pins are ADC inputs

0x0000

00000101

DAC pin configuration

Selects which pins are DAC outputs

0x0000

00000110

Pull-down configuration

Selects which pins have an 85 kΩ pull-down resistor to GND

0x00FF

00000111

LDAC mode

Selects the operation of the load DAC

0x0000

00001000

GPIO write configuration

Selects which pins are general-purpose outputs

0x0000

00001001

GPIO write data

Writes data to general-purpose outputs

0x0000

00001010

GPIO read configuration

Selects which pins are general-purpose inputs

0x0000

00001011

Power-down/reference control

Powers down the DACs and enables/disables the reference

0x0000

00001100

Open-drain configuration

Selects open-drain or push-pull for general-purpose outputs

0x0000

00001101

Three-state pins

Selects which pins are three-stated

0x0000

00001110

Reserved

00001111

Software reset

Resets the AD5593R

0x0000

Table 12. General-Purpose Control Register

MSB

LSB

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Reserved

ADC buffer

precharge

ADC buffer

enable

Lock

configuration

Write all

DACs

ADC

range

select

DAC

range

select

Reserved

Table 13. General-Purpose Control Register Descriptions

Bits

Description

D15 to D10

Reserved. Set these bits to 0.

D9

ADC buffer precharge.

0: the ADC buffer is not used to precharge the ADC. If the ADC buffer is enabled, it is always powered up (default).

1: the ADC buffer is used to precharge the ADC. If the ADC buffer is enabled, it is powered up while the conversion takes

place and then powered down until the next conversion takes place.

D8

ADC buffer enable.

0: the ADC buffer is disabled (default).

1: the ADC buffer is enabled.

D7

Lock configuration.

0: the contents of the I/O pin configuration registers can be changed (default).

1: the contents of the I/O pin configuration registers cannot be changed.

D6

Write all DACs.

0: for future DAC writes, the DAC address bits determine which DAC is written to (default).

1: for future DAC writes, the DAC address bits are ignored and all channels configured as DACs are updated with the same data.

D5

ADC range select.

D4

DAC range select.

D3 to D0

Reserved; set these bits to 0.