AS7421 datasheet(27/53 Pages) AMSCO

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AS7421

Datasheet

• PUBLIC

DS000667

• v1-00 • 2022-Aug-25

│ 26

The device is controlled and monitored by registers accessed through the I²C serial interface. These

registers provide device control functions and can be read to determine device status and acquire

device data.

The register set is summarized below. The values of all registers and fields that are listed as reserved

(gray) or are not listed must not be changed at any time. Two-byte fields are always latched with the

low byte followed by the high byte. The

“Name” column illustrates the purpose of each register by

highlighting the function associated to each bit. The bits are shown from MSB (D7) to LSB (D0).

10.1

Figure 26:

Addr

Name

<D7>

<D6>

<D5>

<D4>

<D3>

<D2>

<D1>

<D0>

Configuration Registers

0x38

CFG_MISC

LED_WAI

T_OFF

WAIT_CYCL

E_ON

SW_RS

0x39

CFG_LED_MUL

LED_MULT [4:0]

0x3A

reserved

0x3B

reserved

0x3C

TEMP_COMPDA

TEMP_COMPDAC [7:0]

0x3D

LED_WAIT

LED_WAIT [7:0]

0x3E

CFG_PINMAP

INT_PINMAP [2:0]

INT_IN

VERT

GPIO_PINMAP [2:0]

RAM Configuration

0x40

CFG_RAM_0

…

32 Byte for programming the configuration data into the internal RAM

0x5F

CFG_RAM_31

Enable Register

0x60

ENABLE

LTF_MODE [1:0]

LED_AUTO [1:0]

SYNC_

TSD_EN

LTF_EN

PON

Configuration Registers

0x61

LTF_ITIME_L

LTF_ITIME [7:0]

0x62

LTF_ITIME_M

LTF_ITIME [15:8]

0x63

LTF_ITIME_H

LTF_ITIME [23:16]

0x64

LTF_WTIME_L

LTF_WTIME [7:0]

0x65

LTF_WTIME_M

LTF_WTIME [15:8]

0x66

LTF_WTIME_H

LTF_WTIME [23:16]

0x67

CFG_LTF

TEMP_DIODE_SEL [2:0]

LTF_CYCLE [1:0]

CLKMOD [2:0]

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