AD5522

Preliminary Technical Data

Rev. PrM | Page 32 of 48

8

GUARD EN

Guard enable. The Guard Amplifier is disabled on power on; write a “1” to enable it. Disabling the guard function if not in use saves

power (typically 400μA per Channel).

7

GAIN1

6

GAIN0

MEASOUT Output Range. The MEASOUT range defaults to the voltage force span for voltage and current measurements, this is

±11.25V, which includes some over range to allow for offset correction. The MEASOUT range may be reduced by using the GAIN0

and GAIN1 data bits. This allows for use of asymmetrical supplies and also for use of a smaller input range ADC.

GAIN1 = “1”

MEASOUT Function

MEASOUT Gain = 1

MEASOUT Gain = 1/5

MV

±VDUT (up to 11.25V)

5

4.5VREF

to

0

GAIN0 = “0”

CURRENT MEAS GAIN = 10

0 to 4.5V

MI

GAIN0 = “1”

CURRENT MEAS GAIN = 5

0 to 2.25V

5

TMP ENABLE

4

TMP1

3

TMP0

Thermal Shutdown Function, TMP ENABLE, TMP1, TMP0

To disable the Thermal Shutdown feature, write a “0” to the TMP ENABLE bit (enabled by default). Bits TMP1 and TMP0 allow the

user to program the thermal shutdown temperature of operation.

TMP ENABLE

TMP1

TMP0

Action

0

X

X

Thermal Shutdown Disabled

1

X

X

Thermal Shutdown Enabled

1

0

0

Shutdown at Junction Temp of 130°C

(Power On Default)

1

0

1

Shutdown at Junction Temp of 120°C

1

1

0

Shutdown at Junction Temp of 110°C

1

1

1

Shutdown at Junction Temp of 100°C

2

LATCHED

Configure open drain CGALM as a latched or unlatched output pin. When high, this bit sets the CGALM alarm output as latched

outputs allowing it to drive a controller I/O without having to poll the line constantly. Default condition on power on is unlatched.

1

0

0

(LSB)

0

Unused bits. Set to 0.