ZOPT2202AC5R datasheet(15/41 Pages) IDT

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ZOPT2202 Datasheet

September 21, 2016

3.4

Device Operation Modes

Table 3.3 Mode Descriptions

Mode

Number

Mode

Name

Comment

Standby

Default mode after power-up. In this mode, the oscillator, all internal support blocks, and the ADCs are

switched off but I²C communication is fully supported.

UVAB_S

Active ADC Channels: UVA, UVB2, COMP

UVAB_S Mode provides the ZOPT2202’s internal temperature and stray light compensation for the UVA and

UVB2 sensor output data.



UVAB_S Mode is a standard operation mode of the ZOPT2202 that is available for activation after

power-up or any ZOPT2202 reset. It does not require additional initialization commands to be sent

before activation.



Note: Internal temperature and stray light compensation is based on COMP channel data.



Note: The COMP channel is located aside from the sensor matrix. Hence, stray light compensation is

not perfectly matched to the UVA and UVB2 sense elements.



Temperature compensation is optimum.



UVAB_S Mode is activated by setting the LS_EN bit to 1 and set the RawMode_SEL bit to 0 in the

MAIN_CTRL register (see section 3.10.1)

Write 02HEX to register 00HEX



Internal temperature and stray light compensation is performed following the calculation before

sensor data is stored in the output register:

UVA

= UVA_raw – COMP

UVB2

= UVB2_raw – COMP

UVB_ONLY

Active ADC Channels: UVB, UV_COMP

UVB_ONLY Mode allows high precision measurements of UVB energy intensity. The sensor response is

chosen such that it can be used to calculate the UV index directly.

Temperature and stray light compensation for the sensor channel is performed internally via the UV_COMP

channel.



UVB_ONLY Mode is a standard operation mode of the ZOPT2202 that is available for activation after

power-up or any ZOPT2202 reset. It does not require additional initialization commands to be sent

before activation.



Note: Internal temperature and stray light compensation is based on the UV_COMP channel data.



Note: The UV_COMP channel is located within sensor matrix. Hence, this mode provides optimum

temperature and stray light compensation for UVB channel.



UVB Mode is activated by setting the LS_EN and UVB_ONLY bits to 1 in the MAIN_CTRL register

(see section 3.10.1)

Write 0AHEX to register 00HEX



Internal temperature and stray light compensation is performed following the calculation before

sensor data is stored in the output register:

UVB = UVB_raw – UV_COMP

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