AS7261N datasheet(14/42 Pages) AMSCO

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AS7261N − Detailed Descriptions

cleared by writing a 1 to the CLR bit (bit2) of the INTR_POLL_

CLR register (0xF8) after each conversion-acquisition cycle is

completed.

Temperature Sensor

The Temperature Sensor measures on-chip temperature on

demand, and enables temperature compensation procedures.

The basic equation for calculating the internal temperature of

the device is:

TMP_VALUE is the derived from TMPL & TMPH (0xD2 [1:0] and

0xD1 [7:0]) register data. Temperature conversions are

performed by writing 0x24 to the TMP_Config register. Polling

the TMP_Config register will indicate data acquisition is

complete upon reading 0x84. After reading 0x84 the TMP_

Config register should be written to either 0x00 for idle or 0x24

to perform another temperature measurement. The result of

the calculation is the device temperature in degree Celsius (°C).

Electronic Shutter with LED_IND or LED_DRV

Driver Control

Under user control there are two LED driver outputs that can

be used to control LEDs on the two driver pins. This allows

different wavelength light sources to be used in the same

system. The LED output sink currents are programmable and

can drive external LED sources. After programming for current

the sources can be turned off and on via registers to provide

the AS7261N with an electronic shutter capability. If turning

LEDs on, they should be fully on optically before a conversion

begins and not shut off until after the conversion-acquisition

cycle completes

The LED_IND pin can be turned on/off via the LED_IND register

with values 0x01, 0x05, 0x09 and 0x0D for sink currents of 1mA,

2mA, 4mA and 8mA respectively.

For the LED_DRV pin, the GAIN_IDRV Register (0xB9) bits 7 and

6 control the drive strength of the pin for current values 12.5mA,

25mA, 50mA and 100mA. This register also controls the gain of

all light acquisitions so care should be taken when writing to it.

The LED_DRV pin can be turned on/off via the LED_DRV register

bit 2.

(EQ1)

0.7604

TMP– VALUE 2.048

•

1024

---------------------------------------------------------

–

2.046 10

–

•

-------------------------------------------------------------------------------- 40

–

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