Data Sheet

AD7381-4

Rev. 0 | Page 27 of 31

CONFIGURATION 1 REGISTER

Addressing.

Power-Down Mode.

Reference Select.

Oversampling Mode.

Resolution.

Oversampling Ratio.

Enable Alert Indicator Function.

CRC Write.

CRC Read.

0

0

1

0

2

0

3

0

4

0

5

0

6

0

7

0

8

0

9

0

10

0

11

0

12

0

13

0

14

0

15

0

[15:12] ADDRESSING (R/W)

[0] PMODE (R/W)

[11:10] RESERVED

[1] REFSEL (R/W)

[9] OS_MODE (R/W)

[2] RES (R/W)

[8:6] OSR (R/W)

[3] ALERT_EN (R/W)

[5] CRC_W (R/W)

[4] CRC_R (R/W)

Table 18. Bit Descriptions for Configuration 1 Register

Bits

Bit Name

Description

Reset

Access

[15:12]

ADDRESSING

Addressing. Bits[15:12] define the address of the relevant register. See the Addressing Registers

section for further details.

0x0

R/W

[11:10]

RESERVED

Reserved.

0x0

R

9

OS_MODE

Oversampling Mode. Sets the oversampling mode of the ADC.

0x0

R/W

0: normal averaging.

1: rolling average.

[8:6]

OSR

Oversampling Ratio. Sets the oversampling ratio for all the ADCs in the relevant mode. Normal

averaging mode supports oversampling ratios of 2×, 4×, 8×, 16×, and 32×. Rolling average

mode supports oversampling ratios of 2×, 4×, and 8×.

0x0

R/W

000: disabled.

001: 2×.

010: 4×.

011: 8×.

100: 16×.

101: 32×.

110: disabled.

111: disabled.

5

CRC_W

CRC Write. Controls the CRC functionality for the SDI interface When setting this bit from a 0 to

a 1, the command must be followed by a valid CRC to set this configuration bit. If a valid CRC is

not received, the entire frame is ignored. If the bit is set to 1, it requires a CRC to clear it to 0.

0x0

R/W

0: no CRC function.

1: CRC function.

4

CRC_R

CRC Read. Controls the CRC functionality for the SDOx interface

0x0

R/W

0: no CRC function.

1: CRC function.

3

ALERT_EN

Enable Alert Indicator Function. This bit functions when the SDO bits = 01. Otherwise, the

ALERT_EN bit is ignored.

0x0

R/W

0: SDOB.

1: ALERT.

2

RES

Resolution. Sets the size of the conversion result data. If OSR = 0 these bits are ignored and the

resolution is set to default resolution.

0x0

R/W

0: normal resolution.

1: 2-bit higher resolution.

1

REFSEL

Reference Select. Selects the ADC reference source.

0x0

R/W

0: selects internal reference.

1: selects external reference.

0

PMODE

Power-Down Mode. Sets the power modes.

0x0

R/W

0: normal mode.

1: shutdown mode.