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AS7221

Functional Description

Datasheet

• PUBLIC

DS000479

• v4-00 • 2019-Jun-28

│ 18

7.2

XYZ Chromatic White Color Sensor

The XYZ chromatic sensor, part of the AS7221 Cognitive Light Engine (CLE), is a next-generation

digital color sensor device. The sensor contains an integrating analog-to-digital converter (16-bit

resolution ADC), which integrates current from photodiodes. Upon completion of the conversion cycle,

the result is transferred to the corresponding data registers. Transfers are double-buffered to ensure

integrity of the data is maintained.

Standard observer tri-

stimulus (XYZ) interference filters are applied to the SLM’s optical channels as

part of the CMOS process. This unique process enables filter responses that mimic the human eye

and are extremely stable over both operating temperature and time. This in turn allows lifetime

correlated color temperature (CCT) calibration to be performed as part of the manufacturing process.

Calibration is accomplished using standard white LEDs at a variety of CCTs to deliver high accuracy;

eliminating the need for light-by-light calibration in most designs. The Smart Lighting Command Set

(SLCS) also includes provisions for application level calibration to provide a mechanism for additional

design-specific calibration and compensation. Note the AS7221 LGA package contains an internal

aperture that provides a package field of view (PFOV) of ± 20.5°. External optics can be used as

needed to expand or reduce this built in PFOV. Scalar commands supported in the SLCS enable a

level of compensation for added optics.

7.3

Inputs

Figure 13:

VDDHV Based Settings for Inputs

VDDHV

Dimming

10.5-15 V

Direct input for DIM, dimming input

2.97-10 V (1)

External 5:1 resistor divider for DIM, dimming input (2)

(1)

For VDDHV

≤ 3.6 V, VDDHV and VDD should be tied together.

(2)

With external dividers connected to 0-10 V inputs, the max voltage to the device input is 2 V.

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