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AS7221

Functional Description

Datasheet

• PUBLIC

DS000479

• v4-00 • 2019-Jun-28

│ 22

allows a direct PWM input at the end of the sensor line and override all PWM values calculated by the

AS7221 and all ATXPWMx values as well.

To set the desired device operation MODE use the appropriate RMODE resistor, also shown in

Figure 18.

Figure 18:

Outputs

MODE

RMODE

Setting

Outputs

PWM_1/0_10V_O

PWM_2 and PWM_3

100

0-10 V analog

Analog 0-VDDHV (1)

Digital PWMs (0-VDD)

470

0-10 V digital

Digital PWM (VDDHV)(2)

Digital PWMs (0-VDD)

1000

Digital 2-CH color

tuning

Analog 0-VDDHV, not used

for dimming

Digital PWMs (0-VDD),

w/Dimming

(1)

For VDDHV>10.5 V, output max is 10 V, else output max tracks VDDHV.

(2)

Digital PWM output is following VDDHV and it not limited to 10 V in digital PWM mode.

7.6

Indicator LED

An LED, connected to pin LED_IND, is used to indicate boot and programming progress of the device.

If an error occurs with the memory access the indicator LED starts blinking operation. When

programming is finished and programming tool disconnected the indicator LED turns on (default

setting).

The LED_IND pin is set for 1 mA operation by the AS7221 factory firmware. This is not under user

control. The indicator LED can be enabled or disabled by using the ATLED0 command. Consideration

should be taken with respect to any final product design to avoid light intrusion from the indicator LED

into the direct or reflected field of view of the sensor.

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