AD74115 datasheet(80/103 Pages) AD

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Data Sheet

AD74115

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Table 43. Bit Descriptions for OUTPUT_CONFIG (Continued)

Bits

Bit Name

Description

Reset

Access

1: Current-Limit 1. VOUT: 16 mA source or sink. IOUT: 1 mA sink.

3-Wire and 4-Wire RTD Configuration Register

Address: 0x07, Reset: 0x0001, Name: RTD3W4W_CONFIG

This register configures the 3-wire and 4-wire RTD measurements.

Table 44. Bit Descriptions for RTD3W4W_CONFIG

Bits

Bit Name

Description

Reset

Access

[15:4]

RESERVED

Reserved.

0x0

RTD_MODE_SEL

3-Wire or 4-Wire RTD Mode Select.

0x0

R/W

0: 3-Wire RTD Mode.

1: 4-Wire RTD Mode.

RTD_EXC_SWAP

3-Wire RTD Excitation Swap. This field is only used for 3-wire RTD.

0x0

R/W

[1:0]

RTD_CURRENT

RTD Current. Values other than those listed as follows select a current of 250 μA.

0x1

R/W

00: 250 μA.

01: 500 μA.

10: 750 μA.

11: 1 mA.

Digital Output with Internal FET Configuration Register

Address: 0x08, Reset: 0x2E00, Name: DO_INT_CONFIG

This register configures the settings for the internal digital output function. When the digital output functionality is enabled, the recommended

configuration of the CH_FUNC_SETUP register is to set it to high impedance.

Table 45. Bit Descriptions for DO_INT_CONFIG

Bits

Bit Name

Description

Reset

Access

RESERVED

Reserved.

0x0

DO_DATA_INT

FET Drive.

0x0

R/W

0: source or sink mode, switch off the FET. Push-pull mode: sink current.

1: source or sink mode, switch on the FET. Push-pull mode: source current.

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