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AS73211

Functional Description

Datasheet

• PUBLIC

DS000556

• v3-01 • 2018-Feb-07

│ 14

Functional Description

Three internal photodiodes with different spectral sensitivity with three A/D converters. The irradiance

responsivity Re and the time of conversion TCONV are user defined and determined by registers

CREG1:GAIN and CREG1:TIME and should be adapted to the application of interest. At the end of

each conversion, the digital equivalents of the filtered input light signal regarding to the sensors area

are stored in the ou

tput registers (MRES1 … MRES3). Additionally a temperature sensor works in

parallel to the three optical channels, delivering the on-chip temperature at the end of conversion. The

pin READY remains at low logic level all the time during the conversion. The rising edge and the

following high logic level of READY signalize the end of conversion. Internal information related to the

conversion is available in a status register, too.

7.1

Operational States

The AS73211 operates in two different states

“Configuration” and “Measurement”. The three least

significant bits of the Operational State Register (OSR) as Device Operational State (DOS) defined the

current state. After applying the power supply voltage including power-on reset or after software reset

the AS73211 stays in Power Down state. It is ready to be programmed via I²C interface. Switching off

Power Down (OSR:PD set to ‚0‘) the AS73211 starts up in Configuration state (CONFIG) or in

Measurement state (MMODE) according to its DOS programming.

7.2

Configuration State

This state enables the access to the configuration registers (CREG1, CREG2, CREG3). Irradiance

responsivity Re and conversion time TCONV can be determined by settings of registers CREG1:GAIN

and CREG1:TIME as well as the kind of measurement mode can be chosen via register

CREG3:MMODE. A measurement is not possible in this state and therefore no access to any

measurement result registers.

7.3

Measurement State

In this state the light-to-digital conversion can be performed. The access to the output result registers

is enabled, but at this time, there is no access possible to the configuration registers. Specific settings

for the measuring task should be performed by programming the configuration registers before the

measurement is started (see chapter 8.5). The change between Configuration and Measurement state

can be performed by programming the DOS value of the operational state register OSR (see Figure

45). A change from Measurement state to Configuration state takes place immediately. Any active

measurement is stopped and all output result registers and the status register are reset as well.

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