AS7262 datasheet(18/48 Pages) OSRAM

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Datasheet, Public

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[v4-00] 2022-Nov-30

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AS7262 − Detailed Description

Electronic Shutter with LED_DRV Driver Control

There are two LED driver outputs that can be used to control

up to 2 LEDs. This will allow different wavelength light sources

to be used in the same system. The LED output sink currents are

programmable and can drive external LED sources: LED_IND

from 1mA, 2mA, 4mA and 8mA and LED_DRV from 12.5mA,

25mA, 50mA and 100mA. The sources can be turned off and on

via I²C registers control or AT commands and provides the

device with an electronic shutter.

Interrupt Operation

If BANK is set to Mode 0 or Mode 1 then the data is ready after

the 1st integration time. If BANK is set to Mode 2 or Mode 3 then

the data is ready after two integration times. If the interrupt is

enabled (INT = 1) then when the data is ready, the INT line is

pulled low and DATA_RDY is set to 1. The INT line is released

(returns high) when the control register is read. DATA_RDY is

cleared to 0 when any of the sensor registers V, B, G, Y, O & R are

read. For multi-byte sensor data (2 or 4 bytes), after the 1st byte

is read the remaining get shadow buffer protected in case an

integration cycle completes just after the 1st byte is read.

In continuous spectral conversion mode (BANK setting of Mode

0, 1, or 2), the sensors continue to gather information at the rate

of the integration time, hence if the sensor registers are not read

when the interrupt line goes low, it will stay low and the next

cycle’s sensor data will be available in the registers at the end

of the next integration cycle.

When the control register BANK bits are written with a value of

Mode 3, One-Shot Spectral Conversion mode is entered. When

a single set of contemporaneous sensor readings is desired,

writing BANK Mode 3 to the control register immediately

triggers exactly two spectral data conversion cycles. At the end

of these two conversion cycles, the DATA_RDY bit is set as for

the other BANK modes. To perform a new One-Shot sequence,

the control register BANK bits should be written with a value of

Mode 3 again. This process may continue until the user writes

a different value into the BANK bits.

I²C Slave Interface

If selected by the I²C_ENB pin setting, interface and control can

be accomplished through an I²C compatible slave interface to

a set of registers that provide access to device control functions

and output data. These registers on the AS7262 are, in reality,

implemented as virtual registers in software. The actual I²C slave

hardware registers number only three and are described in the

table below. The steps necessary to access the virtual registers

defined in the following are explained in pseudocode for

external I²C master writes and reads below.

AS7262 数据表(PDF) 18 Page - OSRAM GmbH

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