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AS7221 bảng dữ liệu(PDF) 15 Page - ams AG

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AS7221 bảng dữ liệu(HTML) 15 Page - ams AG

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ams Datasheet
Page 15
[v1-01] 2016-Dec-08
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AS7221 − Detailed Description
Figure 17:
0-10V Dimming Pin Input
The auxiliary sensor input (AUX) can be configured for 0-10V
analog sensing using a 5:1 resistor divider. Or, AUX can be
configured for digital sensing. Both types are common for
external occupancy sensors. 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 AS7221, include
ams temperature/humidity sensing (ENS-210), and ams
ambient light sensing (TSL4531) can be added via the I²C master
interface. The TSL4531 is used to add daylighting to the AS7221.
Synchronization and Reset
Figure 18:
Synchronization and Reset Circuit
Synchronization and Reset Circuit: This figure shows the basic
diagram when using reset and synchronization function
together.
AS7221 provides optional synchronization of the PWMs. This
sync signal can be derived from the AC mains to enable all
luminaires in a room to be synchronized to prevent beat
frequency flicker. If the SYNC pin is left open, synchronization
is automatically disabled.
0_10V_DIM
0-10V Analog Input
AS7221
CLE
10V
0
ADC
VDD
VDDHV
3.3V
12V
0_10V
0-10V Analog Input
AS7221
CLE
10V
0
ADC
VDD
VDDHV
3.3V
5:1
Rin=200k typ.
0_10V_DIM
MODE
MODE
RMODE
RMODE
SYNC and Reset
CLE
SYNC/
RESN
Opto Co upler
AC Main
Push > 100ms
10k
optional



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