AS7211 datasheet(17/37 Pages) AMSOSRAM

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[v1-00] 2016-Dec-23

AS7211 − Detailed Description

AS7211 provides optional synchronization of the PWMs. This

sync signal can be derived from the AC mains so, for example,

all luminaires in a room are synchronized to prevent beat

frequency flicker. If the SYNC pin is left open, synchronization

is automatically disabled.

Refer to the Figure above. When pulled down for more than

100ms the SYNC/RESN pin will reset the AS7211 Smart Lighting

Manager. In this case the push-button “overrides” the output of

the opto-coupler. Therefore a resistor should be placed in series

with the opto-coupler.

AS7211 Outputs

The AS7211 outputs, used to control ballast dimming and/or

LED string dimming, can be configured as either three PWM

outputs or two PWMs and one analog output. The PWMs are 12

bit and are factory set to 888Hz. Refer to the Figure below.

The three PWM outputs, PWM_1, PWM_2 and PWM_3 all switch

with the same frequency, but not simultaneously for better EMI

performance.

The PWM_1 output can be set to either analog (0-VDDHV) or

digital (0-VDDHV ) dimming. Analog dimming range is 0-100%.

Digital Dimming range is 0-100%. PWM2 and PWM3 track

output 1 dimming level, but are always digital (0-100%).

To set the desired device operation MODE use the appropriate

RMODE resistor, also shown in the Figure below.

Figure 19:

Outputs

Note(s):

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

Indicator LED

An LED, connected to pin LED_IND, is used to indicate

programming progress of the device. During programming of

the AS7211 via an external SD card the indicator LED starts

operation. When programming is finished the indicator LED is

off. The LED_IND pin is set for 1mA operation by the AS7211

factory firmware, and is not under user control.

Refer to the separate ams document for a complete description

of AS7211 Firmware Update Methodology.

MODE

RMODE

Setting

Outputs

PWM_1/0_10V_O

PWM_2 & PWM_3

100 Ω

0-10V analog

Analog 0-VDDHV (1)

Digital PWMs (0-VDD)

470 Ω

0-10V digital

Digital PWM

(0-VDDHV) (1)

Digital PWMs (0-VDD)

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