AS7220 datasheet(16/33 Pages) AMSOSRAM

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[v1-00] 2017-Feb-16

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AS7220 − Detailed Description

If a second supply is not available, VDDHV and VDD are tied

together and the downscale has to be implemented using an

external resistor divider. The maximum range in the

downscaled input is limited to 2V. Hence to accept a full range

10V signal the input resistor divider has to be 5:1 ratio.

Dependent on the level at pin VDDHV the Smart Lighting

Manager automatically scales the internal A/D for either a 0-2V

or 0-10V range. Refer to the Figures above. If the 0_10V_DIM

pin is not used, an external resister pull-up connecting it to

VDDHV is recommended.

Figure 18:

AUX Input

The AUX input is used as a sensor input to allow additional

control, in addition to the 0-10V slider dimming function the 0_

10V_DIM pin does. The sensed AUX voltage is scaled and used

to multiply the dimming scale. The auxiliary sensor input (AUX)

has a 0-3V range for its default analog sensing mode. With this

0-3V range external ranges such as 0-10V can be

accommodated using external resister divider networks such

as a 10:3 network for a 0-10V occupancy sensor. The AUX pin

can also be configured for digital sensing (0, 1 where 1=VDD)

in one of two ways. A flash memory reserved location can be

set when programming the Flash device for operation, or

external I²C access port expanders native to the AS7220 can be

used to set digital sensing. Refer to the separate AS7220 User

Guide for detailed design information for AUX usage. If the AUX

pin is not used, an external resistor pull-up connecting it to VDD

is recommended.

External sensors with native support by the AS7220 can be

added via the I²C master interface. For example the ams

TSL4531 can be used to add Daylighting operation to the

AS7220. Once the TSL4531 is detected by the AS7220, and the

DAY_EN pin has been set to 1 (VDD), daylighting operation

begins.

Lumen and/or CCT maintenance can also be configured two

ways. One is by programming reserved AS7220 flash memory

locations when the entire memory is being programmed.

AUX

AUX Input

AS7220

CLE

ADC

VDD

VDDHV

3.3V

12V

0-10V

AUX Input

AS7220

CLE

10V

ADC

VDD

VDDHV

3.3V

10:3

Rin=200k typ.

AUX

MODE

RMODE

0-3V range

0-3V

range

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