ZOPT2202 datasheet(16/41 Pages) IDT

16 / 41 page

ZOPT2202 Datasheet

September 21, 2016

Mode

Number

Mode

Name

Comment

UVAB_Raw

Active ADC Channels: UVA, UVB, UVB2, UV_COMP, COMP

UVAB_Raw Mode allows optimum temperature and stray light compensation for UVA and UVB sensor output

data by external post-processing.



UVAB_Raw Mode uses a special operation mode of the ZOPT2202. 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 ZOPT2202:

Write B5HEX to register 31HEX

Write DFHEX to register 30HEX

Write 04HEX to register 31HEX



UVAB_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 UVB_Only bit to 0 in the MAIN_CTRL register (see

section 3.10.1)

Write 06HEX to register 00HEX



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

the uncompensated raw data as received from ADCs



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

applying following formulas:

UVA = UVA_raw – UV_COMP

UVB = UVB_raw – UV_COMP

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

UVA

UVB

UVB2

UV_COMP

COMP

Inactive

Active

Inactive

Active

Inactive

Active

Inactive

Active

Inactive

Active

Standby



UVAB_S



UVB_ONLY



UVAB_Raw



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