AS7030B datasheet(76/129 Pages) AMSCO

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AS7030B

Functional Description

Datasheet

• PUBLIC

DS000716

• v1-00 • 2020-Jun-10

128

│ 75

LTFDATA1_H (Address 0x23)

Figure 90:

LTFDATA1_H Register

Addr: 0x23

LTFDATA1_H

Bit

Bit Name

Default

Access

Bit Description

7:0

ltfdata1[15:8]

LTF result channel 1 high byte

ITIME (Address 0x24)

Figure 91:

ITIME Register

Addr: 0x24

ITIME

Bit

Bit Name

Default

Access

Bit Description

7:0

Itime

LTF integration time. MODCLK is 2/3 MHz

(666.67 kHz). One LSB of itime is 3.072 ms

(2048 MODCLK cycles).

0: 3.072 ms

...

255: 786.432 ms

Using the itime_unit register (see below), the

unit of itime can be reduced by 2, 4, or 8. This

shorter integration times can be selected

(required for flicker detection), but it can also be

used to increase the resolution of itime. For

example, if 50 ms integration time are desired,

the best value for regular itime would be 15

(=16 periods=49.152 ms). However, but setting

itime_unit=2 (LSB=768

s), one can select 64

(=65 periods=49.9 ms)

Warning: selecting an integration time smaller

than 3.072 ms will reduce the resolution of the

conversion, as the maximum ltfdata value is not

1024 (10 bits) anymore, but 512 (9 bits) in case

of 1.536 ms integration time, 256 (8 bits) for

768 µs and 128 (7 bits) for 384 µs

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