Preliminary Technical Data

AD5751

Rev. PrA | Page 17 of 22

HARDWARE CONTROL:

Hardware control is enabled by connecting the HW SELECT pin to DVCC. In this mode, pins R3,R2,R1,R0 along with RSEL pin are used

to configure the output range as per Table.

RSEL

R3

R2

R1

R0

Output Configuration

0

0

0

0

0

4-20MA

External Current Sense Resistor 15k ohm.

0

0

0

0

1

0-20MA

External Current Sense Resistor 15k ohm.

0

0

0

1

0

0-24MA

External Current Sense Resistor 15k ohm.

0

0

0

1

1

N/A. If selected output will drive 0V.

0

0

1

0

0

N/A. If selected output will drive 0V.

0

0

1

0

1

0-5V

0

0

1

1

0

0-10V

0

0

1

1

1

N/A. If selected output will drive 0V.

0

1

0

0

0

N/A. If selected output will drive 0V.

0

1

0

0

1

0-6.0V (20% over range)

0

1

0

1

0

0-12.0V (20% over range)

0

1

0

1

1

N/A. If selected output will drive 0V.

0

1

1

0

0

N/A. If selected output will drive 0V.

0

1

1

0

1

N/A. If selected output will drive 0V.

0

1

1

1

0

0-40V

0

1

1

1

1

0-44V

1

0

0

0

0

4-20MA

Internal Current Sense Resistor.

1

0

0

0

1

0-20MA

Internal Current Sense Resistor.

1

0

0

1

0

0-24MA

Internal Current Sense Resistor.

1

0

0

1

1

N/A. If selected output will drive 0V.

1

0

1

0

0

N/A. If selected output will drive 0V.

1

0

1

0

1

0-5V

1

0

1

1

0

0-10V

1

0

1

1

1

N/A. If selected output will drive 0V.

1

1

0

0

0

N/A. If selected output will drive 0V.

1

1

0

0

1

0-6.0V (20% over range)

1

1

0

1

0

0-12.0V (20% over range)

1

1

0

1

1

N/A. If selected output will drive 0V.

1

1

1

0

0

N/A. If selected output will drive 0V.

1

1

1

0

1

3.92ma – 20.4ma

Internal Current Sense Resistor.

1

1

1

1

0

0ma – 20.4ma

Internal Current Sense Resistor.

1

1

1

1

1

0ma – 24.5ma

Internal Current Sense Resistor.

In hardware mode there is no status register. The fault conditions; open circuit, short circuit and over temperature are available on pins

IFAULT, VFAULT and TEMP. If any one of these fault conditions are set then a low is asserted on the specific fault pin. IFAULT, VFAULT

and TEMP are open drain outputs and therefore can be connected together to allow the user generate one interrupt to the system

controller to communicate a fault. If hardwired in this way, it will not be possible to isolate which fault occurred in the system.