AD5770R datasheet(44/59 Pages) AD

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AD5770R

Data Sheet

Rev. 0 | Page 44 of 59

Address: 0x1B, Reset: 0x00, Name: REFERENCE

Voltage Reference Setup

11:

Off)

Internal 1.25V (Reference Output

10: External 1.25V.

01:

On)

Internal 1.25V (Reference Output

00: External 2.5V.

IREF Resistor Setup

1: External Resistor.

0: Internal Resistor.

[7:3] RESERVED

[1:0] REFERENCE_VOLTAGE_SEL (R/W)

[2] REFERENCE_RESISTOR_SEL (R/W)

Table 34. Bit Descriptions for REFERENCE

Bits

Bit Name

Description

Reset

Access

[7:3]

Reserved

Reserved.

0x0

REFERENCE_RESISTOR_SEL

IREF resistor setup. This bit selects whether an internal or external resistor is used

for reference current generation.

0x0

R/W

0: internal resistor.

1: external resistor.

[1:0]

REFERENCE_VOLTAGE_SEL

Voltage reference setup. These bits select the voltage reference scheme used for

reference current generation.

0x0

R/W

00: external 2.5 V.

01: internal 1.25 V (reference output on).

10: external 1.25 V.

11: internal 1.25 V (reference output off).

Address: 0x1C, Reset: 0x06, Name: ALARM_CONFIG

Background CRC Alarm Mas k

Activation.

ALARM

Mas k Background CRC

0: Norm al Operation.

Open Drain ALARM Enable

Open Drain Enable.

ALARM

Open Drain Dis able.

ALARM

External IREF Res is tor Fault Alarm

Mas k

Activation.

ALARM

Mas k IREF Fault

0: Norm al Operation.

Therm al Shutdown Enable

1: Enable Therm al Shutdown.

Recom m ended.

Dis able Therm al Shutdown - Not

Negative Voltage Channel 0 Fault

Alarm Mas k

Activation.

ALARM

Mas k Negative Channel 0

0: Norm al Operation.

Background CRC Enable

1: Enable Background CRC.

0: Dis able Background CRC.

Over-Tem perature Fault Alarm Mas k

Activation.

ALARM

Mas k Over Tem perature

0: Norm al Operation.

Over-Tem perature Warning Alarm

Mas k

Activation.

ALARM

Mas k Tem perature Warning

0: Norm al Operation.

[7] BACKGROUND_CRC_ALARM_MASK (R/W)

[0] OPEN_DRAIN_EN (R/W)

[6] IREF_FAULT_ALARM_MASK (R/W)

[1] THERMAL_SHUTDOWN_EN (R/W)

[5] NEGATIVE_CHANNEL0_ALARM_MASK (R/W)

[2] BACKGROUND_CRC_EN (R/W)

[4] OVER_TEMP_ALARM_MASK (R/W)

[3] TEMP_WARNING_ALARM_MASK (R/W)

Table 35. Bit Descriptions for ALARM_CONFIG

Bits

Bit Name

Description

Reset

Access

BACKGROUND_CRC_ALARM_MASK

Background CRC alarm mask. When this bit is set, the ALARM pin does

not activate for background CRC errors.

0x0

R/W

0: normal operation.

1: mask background CRC ALARM activation.

IREF_FAULT_ALARM_MASK

External IREF resistor fault alarm mask. When this bit is set, the ALARM pin

does not activate for external reference current generation resistor faults.

0x0

R/W

0: normal operation.

1: mask IREF fault ALARM activation.

AD5770R Datasheet(PDF) 44 Page - Analog Devices

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