AS7220 datasheet(15/33 Pages) AMSOSRAM

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[v1-00] 2017-Feb-16

AS7220 − Detailed Description

XYZ Chromatic White Color Sensor

The XYZ chromatic white/color sensor, part of the AS7220

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.

AS7220 Inputs

Figure 16:

VDDHV Based Settings for Inputs

Note(s):

1. For VDDHV <= 3.6V, VDDHV and VDD should be tied together.

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

Figure 17:

0-10V Dimming Pin Input

For the AS7220, dimming is accomplished from the input pin

(0_10V_DIM). Local hardware inputs can be provided by, for

example, a slide control dimmer. The 0-10V DIM analog input

signal is downscaled by the AS7220 with an internal voltage

divider and converted to a 10 bit digital value, 0V=full dimming,

10V=no dimming. When using the internal voltage divider the

voltage at the VDDHV pin has to be higher than 10V, typically

12V.

VDDHV

Dimming

10.5-15V

Direct input for 0_10V_DIM, dimming input

2.97-10V (1)

External 5:1 resistor divider for 0-10V_DIM, dimming input (2)

0_10V_DIM

0_10V_DIM Input

AS7220

CLE

10V

ADC

VDD

VDDHV

3.3V

12V

0-10V

0_10V_DIM Input

AS7220

CLE

10V

ADC

VDD

VDDHV

3.3V

5:1

Rin=200k typ.

0_10V_DIM

MODE

RMODE

0-10V range

0-2V

range

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