ZOPT2201 datasheet(17/44 Pages) IDT

17 / 44 page

ZOPT2201 Datasheet

September 2, 2016

Mode

Number

Mode Name

Description

ALS/UVBS_Raw

Active ADC Channels: ALS, UVB, UV_COMP, COMP

ALS/UVBS_Raw Mode allows optimum temperature and stray light compensation for ALS and UVBS

output data by external post-processing.



ALS/UVBS_Raw Mode uses a special operation mode of the ZOPT2201. It requires a specific

sequence to initialize after power up.



The following commands must be sent via I²C single byte access to activate the special operation

mode of ZOPT2201:



Write B5HEX to register 31HEX



Write DFHEX to register 30HEX



Write 04HEX to register 31HEX



ALS/UVBS_Raw operation is activated (after the sequence above has been sent) by setting the

LS_EN and RawMode_SEL bits to 1 and setting the LS_Mode bit to 0 in the MAIN_CTRL register

(see section 3.11.1)



Write 06HEX to register 00HEX



No internal temperature and stray light compensation is carried out. All channel data registers

(see Table 3.10) carry the uncompensated raw data as received from the ADCs.



Important: Proper temperature and stray light compensation must be done on the application level

applying following formulas:



ALS = ALS_raw – COMP



UVB = UVB_raw – UV_COMP

Important: The internal digital trimming factors are not applied to the output data in the

ALS/UVBS_Raw Mode. If this mode is used, contact IDT for the related application note

(see contact information on last page).

Table 3.4 Channel Activation vs. Operation Mode

Mode

Number

Mode Name

ALS

UVB

UV_COMP

COMP

Inactive

Active

Inactive

Active

Inactive

Active

Inactive

Active

Standby



ALS



UVBS



ALS/UVBS_Raw



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