ams Preliminary Datasheet, Confidential: [v0-92] 2016–M10–18 AS7221 – 1

AS7221

XYZ Chromatic Manager for Network

Enabled Smart Lighting

General Description

The AS7221 Smart Lighting Manager device is part of the ams “Cognitive Lighting™”

family of products that enable lights to be “aware” and adapt to their surroundings

providing human lighting needs and energy conservation needs autonomously. The

device is equipped with an advanced Cognitive Lighting Engine (CLE) to optimize

daylight harvesting, Chromatic White Color tuning, and lumen maintenance while it

drives dimming ballasts with direct connection to Local Sensor Networks (LSN), like

occupancy sensors, dimmers or bridges.

AS7221 XYZ Chromatic White Color sensing provides coordinates consistent with

the CIE 1931 color coordinates. It also maps the XYZ coordinates to the x, y (z) of

the 2-dimensional color gamut and scales the coordinates to the CIE 1976 u’v’

coordinate system. The AS7221 integrates standard observer filters into standard

silicon via Nano-optic deposited interference filters technology packaged in a 3D

wafer level optical package which has no aging effects like plastic packages.

The AS7221 connects to standard 0-10V dimmers inputs and drives 0-10V dimming

ballasts/drivers for fluorescent lighting or LED drivers, and LED strings for LED

lighting.

A UART interface is provided for configuration, control and management of the CLE.

This UART interface responds to simple AT commands.

Ordering Information appears at end of datasheet.

AS7221 – 2 ams Preliminary Datasheet, Confidential: [v0-92] 2016–M10–18

Key Benefits & Features

The benefits and features of this device are listed below:

Figure 1: Added Value of Using AS7221

Benefits

Features

 Accurate control of variable CCT and

spectrally tunable lighting

 XYZ tri-stimulus color sensing for direct

translation to CIE 1931 standard observer

color map

 Automatic spectral and lumen maintenance

over temperature and time

 Autonomous color point and lumen output

adjustment resulting in automatic spectral

and lumen maintenance

 Direct serial interface for connection to

standard networks

 Simple UART interface for connection to

network hardware clients for protocols such

as Bluetooth, WiFi and ZigBee

 Simple lamp or luminaire configuration and

commissioning using defined command set

 Smart Lighting Command Set (SLCS) uses

simple text-based commands to control and

configure a wide variety of functions

 Compatible with standard dimmer controls

and occupancy sensors

 Directly interfaces to 0-10V dimmer controls

and standard occupancy sensors

 Directly interfaces to LED driver via PWM

 Built-in PWM generator to dim LED lamps

and luminaires

 12-bit resolution for precise dimming down to

 Directly interfaces to ballast via 0-10V

 0-10V analog output for control of

conventional dimming ballasts in florescent

and LED lamps

 Small package, wide operating range with

critical optics built-in

 20-pin LGA package 4.5 x 4.7 x 2.5mm with

integrated aperture

 -40°C to +85°C

Applications

Autonomous, networked solid-state lighting manager for variable CCT and daylight

harvesting:

 Integrated smart lighting control of variable CCT white lighting solutions

 Luminaires intended to meet California Title 24 daylighting requirements

 Commercial, retail, and residential white/color changing LED lighting systems

 Networked lighting systems with IoT sensor expandability

ams Preliminary Datasheet, Confidential: [v0-92] 2016–M10–18 AS7221 – 3

Block Diagram

Figure 2: Functional Blocks of AS7221

VDD

VDDHV

GND

MISO

SCK

MOSI

CSN_SD

SCL_M

SDA_M

SYNC / RESN

°C

AUX

0-10V

PWM_1 / 0_10V_O

DAC

LED_IND

PWM

Generator

MODE

PWM_2

PWM_3

0_10V_DIM

Dimming &

Auxiliary Mode

UART

C Master

SPI

Master

OSC

16MHz

Chromatic White

XYZ Sensors

PWM

ZYX

VDD

VDDHV

Optional Inputs

Setup

Outputs

Cognitive Lighting

Engine (CLE)

Network Access

The AS7221 provides closed loop Chromatic White sensing and PWM tuning while interfacing to

Local and Network controls.

Pin Assignments

Figure 3: Pin Diagram of AS7221 (top view)

6 10

1620