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AS7038RB

Functional Description

Datasheet

• PUBLIC

DS000726

• v2-00 • 2021-Jun-02

126

│ 74

LTF_CONFIG (Address 0x25)

Figure 92:

LTF_CONFIG Register

Addr: 0x25

LTF_CONFIG

Bit

Bit Name

Default

Access

Bit Description

infinite_itime

If this is asserted, then integration does not

stop. The ITIME setting is ignored. Use with

watch the ltfdata counters. (Warning: must be

filtered in software to prevent inconsistent

upper/lower byte). It's implemented as a count

disable on the integration counter, so when

resetting bit to 0 again, the itime counter will

continue and results can be read afterwards

through the regular mechanisms (ltfdata or

FIFO) This is intended for very long integration

times - as the timing is controlled by

software/I²C, accuracy fully depends on the

system and I²C master.

az_disable_auto

0: Run autozero on both channels every time

FM mode is activated for the first time after

ENAB is being asserted.

1: Do not run autozero automatically. Autozero

can only be activated manually

(AZ_CONTROL)

5:4

az_mode

Autozero mechanism. It is a simple and robust

follower circuit that requires as many cycles as

offsetvalue minus startvalue. Mode 0 is the

safe default mode. Mode 1 is used in

production test to be sure that the DAC can

generate all values. Mode 2 can be used if AZ

time is an issue, if one is certain that the

AZvalue has not changed much: typically if full

AZ has been run, one can assume that offset

only changes a little bit from temperature.

Settings

Mode

Always start at zero when

searching the best offset

value,128+16 cycles

Always start at the previous offset

with the auto-zero mechanism,

256+16 cycles

Always start at the previous offset

with the auto-zero mechanism,

16+16 cycles

Not used

ltf_prox_mode

LTF proximity mode

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