AS7221 [AMSCO]

Calibrated XYZ tri-stimulus color sensing for direct translation to CIE 1931/1976 standard observer color MAPS;


型号：	AS7221
厂家：	AMS(艾迈斯)
描述：	Calibrated XYZ tri-stimulus color sensing for direct translation to CIE 1931/1976 standard observer color MAPS
文件：	总36页 (文件大小：893K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

AS7221

Calibrated XYZ Chromatic Manager for

Network Enabled Smart Lighting

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, autonomously

adapting to human lighting and energy conservation needs.

The device is equipped with an advanced Cognitive Lighting

Engine (CLE) to optimize, chromatic white/color tuning,

daylight harvesting and lumen maintenance via a combination

of PWM and/or 0-10V controls with dimming ballasts. Direct

connection to a local sensor network (LSN), enables

connectivity with standard occupancy sensors, dimmers or

communications bridges.

General Description

AS7221 XYZ chromatic white/color sensing provides mapping

to x, y (z) of the CIE 1931 2-dimensional color gamut coordinates

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

which deliver high-stability over time and temperature. The

LGA package includes a built in aperture to control light

entering the sensor array. Integrated intelligence enables

lifetime CCT calibration to within 2-4 Macadam steps.

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

drives 0-10V dimming ballasts/drivers to enable a highly

cost-effective white tunable current-steering luminaire design

with a single-channel constant current ballast. Direct PWM

inputs can also interface to standard LED drivers or

multi-channel ballasts for constant voltage LED lighting

architectures.

A UART interface is provided for configuration, control and

management of the CLE. This UART interface responds to simple

Smart Lighting Set commands.

Ordering Information and Content Guide appear at end of

datasheet.

ams Datasheet

Page 1

[v1-01] 2016-Dec-08

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AS7221 − General Description

Key Benefits & Features

The benefits and features of this device are listed below:

Figure 1:

Added Value of Using AS7221

Benefits

Features

• Calibrated XYZ tri-stimulus color sensing for direct

translation to CIE 1931/1976 standard observer color

maps

• Accurate control of variable CCT and spectrally

tunable lighting

• Autonomous color point and lumen output

adjustment resulting in automatic spectral and

lumen maintenance

• Automatic spectral and lumen maintenance

over temperature and time

• Simple UART interface for connection to network

hardware clients for protocols such as Bluetooth,

ZigBee and WiFi

• Direct serial interface for connection to

standard networks

• Smart Lighting Command Set (SLCS) uses simple

text-based commands to control and configure a

wide variety of functions

• Simple lamp or luminaire configuration and

commissioning using defined command set

• Compatible with standard dimmer controls and

occupancy sensors

• Directly interfaces to 0-10V dimmer controls and

standard occupancy sensors

• Built-in PWM generator to dim LED lamps and

luminaires

• Directly interfaces to LED driver via PWM

• Directly interfaces to ballast via 0-10V

• 12-bit resolution for precise dimming down to 1%

• 0-10V analog output for control of conventional

dimming ballasts in a current steering design

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

integrated aperture

• -40°C to 85°C

• Small package, wide operating range with

critical optics built-in

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

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AS7221 − General Description

Block Diagram

Figure 2:

Functional Blocks of AS7221

VDDHV

VDD

Outputs

VDD

VDDHV

0-10V

VDD

Optional Inputs

VDDHV

DAC

PWM_1 / 0_10V_O

Cognitive Lighting

Engine (CLE)

PWM

VDD

PWM

PWM_2

PWM_3

Generator

0_10V_DIM

AUX

Dimming&

Auxiliary Mode

VDD

Chromatic White

XYZ Sensors

SYNC / RESN

MODE

SDA_M

SCL_M

I²C Master

Setup

LED_IND

°C

Network Access

VDD

OSC

16MHz

MISO

UART

SPI

Master

MOSI

SCK

CSN_SD

GND

Functional Blocks of AS7221: The AS7221 provides closed loop chromatic white sensing and PWM tuning while

interfacing to local and network controls.

ams Datasheet

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AS7221 − Pin Assignments

Pin Assignments

Figure 3:

Pin Diagram of AS7221 (Top View)

Figure 4:

Pin Description of AS7221 (20 Pin LGA)

Pin Number

Pin Name

Description

PWM_3

Digital PWM 3

SYNC

RESN

SCK

SYNC input

Reset pin, active low

SPI serial clock

SPI MOSI

MOSI

MISO

CSN_EE

CSN_SD

AUX

SPI MISO

Chip select for the required external serial flash memory, active low

Chip select for SD Card interface, active low

Auxiliary mode input pin

I²C master clock pin

SCL_M

SDA_M

I²C master data pin

UART RX pin

UART TX pin

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AS7221 − Pin Assignments

Pin Number

Pin Name

Description

0_10V_DIM

VDDHV

MODE

0-10V input dimming pin

High Voltage Supply

Mode selection pin

Ground

GND

VDD

Low Voltage Supply

LED_IND

PWM_1

0_10V_O

PWM_2

LED Driver output for Indicator LED, current sink

Digital PWM 1

0-10V output pin

Digital PWM 2

ams Datasheet

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AS7221 − Absolute Maximum Ratings

Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. These are stress

ratings only. Functional operation of the device at these or any

other conditions beyond those indicated under Electrical

Characteristics is not implied. Exposure to absolute maximum

rating conditions for extended periods may affect device

reliability. The device is not designed for high energy UV

(ultraviolet) environments, including upward looking outdoor

applications, which could affect long term optical performance.

Absolute Maximum Ratings

Figure 5:

Absolute Maximum Ratings

Symbol

Parameter

Min

Max

Units

Comments

Electrical Parameters

Pin VDD to GND,

Low Voltage pin

Supply Voltage VDD

-0.3

DD_MAX

Pin VDDHV to GND,

High Voltage pin

Supply Voltage VDDHV

-0.3

DDHV_MAX

Input/Output Pin Voltage

VDD + 0.3

Low Voltage pins to GND

High Voltage pins to GND

DD_IO

-0.3 VDDHV + 0.3

100

DDHV_IO

Input Current

(latch-up immunity)

JESD78D

SCR

Electrostatic Discharge

HBM

ESD

JS-001-2014

JSD22-C101F

1000

HBM

Electrostatic Discharge

CDM

ESD

500

CDM

Temperature Ranges and Storage Conditions

Storage Temperature

-40

°C

strg

IPC/JEDEC J-STD-020. The reflow

peak soldering temperature (body

temperature) is specified

according IPC/JEDEC J-STD-020

“Moisture/Reflow Sensitivity

Classification for Non hermetic

Solid State Surface Mount

Devices”

Package Body

Temperature

260

°C

body

Relative Humidity

(non-condensing)

Represents a 168 hour max. floor

lifetime

MSL

Moisture Sensitivity Level

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AS7221 − Electrical Characteristics

All limits are guaranteed with VDD = 3.3V, VDDHV = 12V,

= 25ºC. The parameters with min and max values are

Electrical Characteristics

AMB

guaranteed with production tests or SQC (Statistical Quality

Control) methods. If VDD and VDDHV are to be the same

voltage, they must be sourced by the same 2.97-3.6V supply.

Figure 6:

Electrical Characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

General Operating Conditions

Low Voltage Operating

Supply

VDD

2.97

3.3

3.6

High Voltage Operating

Supply

VDDHV

VDD

-40

Operating Temperature

Operating Current

°C

AMB

VDD

Internal RC Oscillator

Frequency

15.7

16.3

1.2

MHz

OSC

(1)

Jitter

@25°C

JITTER

0-10V Output (0_10V_O pin)

Resistive Load

Source Current

Sink Current

kΩ

OUT_10

-10

S_10

SINK_10

VIN=12V, DAC &

PWM1 both

disabled

HV Output Leakage Current

0.73

1.6

LEAK_HV

Capacitive Load

Output Swing

100

LOAD_10

(2)

OUT_10

0-10V Input

VDDHV ≥ 12V

Analog Input Resistance

138

200

315

8.5

kΩ

°C

IN_HV

Temperature Sensor

Absolute Accuracy of the

Temperature Measurement

-8.5

TEMP

ams Datasheet

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AS7221 − Electrical Characteristics

Symbol

Parameter

Conditions

Indicator LED

1, 2, 4 or 8

Min

Typ

Max

Unit

LED Current

IND

Accuracy of Current

-30

ACC

Voltage Range of Connected

LED

Vds of current sink

0.3

VDD

LED

Digital Inputs and Outputs

I , I

Logic Input Current

Vin=0V or VDD

-1

μA

IH IL

Logic Input Current

(SYNC/RESN pin)

Vin=0V

-0.2

SYNC/RESN

CMOS Logic High Input

CMOS Logic Low Input

CMOS Logic High Output

CMOS Logic Low Output

Current Rise Time

0.7* VDD

VDD

0.3* VDD

VDD-0.4

0.4

I=1mA

(1)

C(Pad)=30pF

RISE

(1)

Current Fall Time

C(Pad)=30pF

FALL

Note(s):

1. Guaranteed, not production tested

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

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AS7221 − Electrical Characteristics

Figure 7:

AS7221 I²C Master Timing Characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

I²C Interface

100

400

kHz

μs

SCL Clock Frequency

SCLK

Bus Free Time Between a STOP

and START

1.3

BUF

Hold Time (Repeated) START

LOW Period of SCL Clock

HIGH Period of SCL Clock

Setup Time for a Repeated START

Data Hold Time

0.6

1.3

0.6

μs

HD:STA

LOW

HIGH

SU:STA

0.9

HD:DAT

Data Setup Time

100

SU:DAT

Rise Time of Both SDA and SCL

Fall Time of Both SDA and SCL

Setup Time for STOP Condition

300

0.6

SU:STO

CB — total capacitance

of one bus line in pF

Capacitive Load for Each Bus Line

I/O Capacitance (SDA, SCL)

400

I/O

Figure 8:

I²C Master Timing Diagram

t_LOW

t_R

t_F

SCL

t_HIGH

t_SU:DAT

t_SU:STA

t_HD:STA

t_HD:DAT

t_SU:STO

V_IH

V_IL

SDA

t_BUF

Stop

Start

ams Datasheet

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AS7221 − Electrical Characteristics

Figure 9:

AS7221 SPI Timing Characteristics

Symbol

Parameter

Conditions

Min

Typ

Max Unit

SPI Interface

MHz

Clock Frequency

Clock High Time

Clock Low Time

SCK Rise Time

SCK Fall Time

SCK

SCK_H

SCK_L

SCK_RISE

SCK_FALL

Time between CSN high-low

transition to first SCK high transition

CSN Setup Time

CSN Hold Time

CSN_S

Time between last SCK falling edge

and CSN low-high transition

100

CSN_H

CSN Disable Time

Data-Out Setup Time

Data-Out Hold Time

Data-In Valid

100

CSN_DIS

DO_S

DO_H

DI_V

Figure 10:

SPI Master Write Timing Diagram

t_{CS N_DIS}

CSN

tCSN_H

t_{SCK_RISE}

t_{SCK_FALL}

t_{CSN_S}

SCK

t_{DO_S}

t_{DO_H}

MOSI

MISO

MSB

LSB

HI-Z

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AS7221 − Electrical Characteristics

Figure 11:

SPI Master Read Timing Diagram

CSN_xx

tSCK_H

tSCK_L

SCK

t_{DI_V}

Dont care

MOSI

MISO

MSB

LSB

Figure 12:

Typical Spectral Responsivity

CIE

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0.0

ams Datasheet

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AS7221 − Electrical Characteristics

Figure 13:

AS7221 Optical Characteristics

Typ ⁽¹⁾

Symbol

Parameter

Conditions

Min

Max

Unit

Color Measurement White Light CCT=2700K,

(2)

0.002

du’v’

Color_m

Z_count

Accuracy

3500K, 4500K and 5700K

counts/

Z Channel Count

Accuracy

White light CCT = 5700K

3.375

4.5

5.625

(μW/cm )

Note(s):

1. Typical values at Lux ≥50, Integration time=400.4ms, Gain=1x, T_AMB= 25ºC.

2. Calibration and measurements are made using diffused light.

Figure 14:

AS7221 LGA Package Field of View

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AS7221 − Detailed Description

Detailed Description

AS7221 Smart Lighting Manager - Overview

The Cognitive Light Engine (CLE) is the “brains” of the Smart

Lighting Manager. The CLE constantly processes information

from the calibrated XYZ chromatic white/color sensor, network

access and inputs while controlling outputs. AS7221 initial

setup and ongoing parameter storage is automatically done by

software within the required external serial flash memory, via

SPI bus.

A luminaire solution for chromatic white/color maintenance

with lumen maintenance requires only the AS7221. A luminaire

solution with chromatic white color/maintenance, lumen

maintenance and daylighting requires just the addition of an

ams TSL4531 single chip ambient light sensor, connected via

I²C. Refer to the table in the Figure below.

Overall AS7221 timing generation uses an on chip 16MHz

temperature compensated oscillator for master clock timing.

Refer to the separate AS7221 User Guide as well as the ams

Smart Lighting Command Set document for additional usage

and setup information.

Figure 15:

AS7221 Solution Chart

Device Orientation

(from luminaire light source)

Solution Required

Chromatic Color

Maintenance

Lumen

Maintenance

TSL4531

(optional)

Daylighting

AS7221

↑

√

(into luminaire)

(not required)

↑

↓

√

(into luminaire)

(into room)

ams Datasheet

[v1-01] 2016-Dec-08

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AS7221 − Detailed Description

XYZ Chromatic White Color Sensor

The XYZ chromatic white/color sensor, part of the AS7221

Cognitive Light Engine (CLE), is a next-generation digital color

sensor device. The sensor contains an integrating

analog-to-digital converter (16-bit resolution ADC), which

integrates current from photodiodes. Upon completion of the

conversion cycle, the result is transferred to the corresponding

data registers. Transfers are double-buffered to ensure integrity

of the data is maintained.

Standard observer interference filters realize the XYZ response,

which enables both a no life-time drift and very high

temperature stability. Note the AS7221 LGA package contains

an internal aperture that provides a package field of view

(PFOV) of 20.5°. External optics can be used as needed to

expand or reduce this built in PFOV.

AS7221 Inputs

Figure 16:

VDDHV Based Settings for Inputs

VDDHV

Dimming

10.5-15V

Direct input for 0_10V_DIM, dimming input

External 5:1 resistor divider for 0-10V_DIM, dimming input

(1)

(2)

2.97-10V

Note(s):

1. For VDDHV <= 3.6V, VDDHV and VDD should be tied together.

2. With external dividers connected to 0-10V inputs, the max voltage to the device input is 2V.

For the AS7221, dimming can be accomplished from either the

input pin (0_10V_DIM) or network command via the UART. For

network commanded dimming, using the AS7221 Smart

Lighting Command set, the UART interface is used.

Local hardware inputs can be provided by, for example, a slide

control dimmer. The 0-10V DIM analog input signal is

downscaled by the AS7221 with an internal voltage divider and

converted to a 10 bit digital value, 0V=full dimming, 10V=no

dimming. When using the internal voltage divider the voltage

at the VDDHV pin has to be higher than 10V.

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

together and the downscale has to be done by 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 selects

either the internal or the external voltage divider. Refer to the

Figures above and below. If the 0_10V_DIM pin is not used, an

external resister pull-up connecting it to VDDHV is

recommended.

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AS7221 − Detailed Description

Figure 17:

0-10V Dimming Pin Input

12V

VDDHV

3.3V

VDD

10V

VDD

VDDHV

10V

0_10V_DIM

0_10V

5:1

MODE

R_in=200k typ.

CLE

ADC

0_10V_DIM

R_{MO DE}

0-10V Analog Input

AS7221

0-10V Analog Input

AS7221

R_{MO DE}

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

Opto Coupler

AC Main

SYNC/

RESN

10k

CLE

optional

SYNC and Reset

Push > 100ms

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.

ams Datasheet

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AS7221 − Detailed Description

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

100ms the SYNC/RESN pin will reset the AS7221 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.

AS7221 Outputs

The AS7221 outputs, used to control dimming and LED

warm/cool strings, can be configured as either three PWM

outputs, two PWMs and one analog output, or two PWMs. The

PWMs are 12 bit and factory set to 888 Hz. Refer to the Figure

below.

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

with the same frequency, but are not simultaneous 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 10-100%.

Digital Dimming range is 1-100%. PWM2 and PWM3 are used

for cool white and warm white LED color controlling. Either

string can be warm or cool as the AS7221 automatically

configures string color type. Range is 0-100% for both PWM2

and PWM3.

To set the desired device operation MODE use the appropriate

resistor, also shown in the Figure below.

MODE

Figure 19:

Outputs

R_MODE

MODE

Setting

PWM_1/0_10V_O

PWM_2 and PWM_3

Digital PWMs (0-VDD)

(1)

100 ꢀ

470 ꢀ

0-10V analog

0-10V digital

Analog 0-VDDHV

(1)

Digital PWMs (0-VDD)

Digital PWM (0-VDDHV)

1000 ꢀ

Digital 2-CH color tuning n.a.

Digital PWMs (0-VDD), w/Dimming

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 AS7221 via an external SD card the indicator LED starts.

When programming is finished the indicator LED is off.

The LED_IND pin is set for 1mA operation by the AS7221 factory

firmware, and is not under user control.

Refer to the separate ams document for a complete description

of AS7221 Firmware Update Methodology.

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AS7221 − Detailed Description

UART and Smart Lighting Command Interface

The UART block implements the TX and RX signals as defined

in the RS-232 / V.24 standard communication protocol.

UART Feature List

• Full Duplex Operation (Independent Serial Receive and

Transmit Registers) with FIFO buffer of 8 bytes for each.

• Factory set to 115.2k Baud

• Supports Serial Frames with 8 Data Bits, no Parity and

1 Stop Bit.

Operation

Transmission

If data is available in the transmit FIFO, it will be moved into the

output shift register and the data will be transmitted at the

configured Baud Rate, starting with a Start Bit (logic zero) and

followed by a Stop Bit (logic one).

Reception

At any time, with the receiver being idle, if a falling edge of a

start bit is detected on the input, a byte will be received and

stored in the receive FIFO. The following Stop Bit will be checked

to be logic one.

Figure 20:

UART Protocol

Data Bits

T_bit=1/Baude Rate

Start Bit

Stop Bit Next Start

Always High

Always Low

Start Bit detected

After T_bit/2: Sampling of Start Bit

After T_bit: Sampling of Data

Sample Points

ams Datasheet

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AS7221 − Detailed Description

Smart Lighting Command Interface

The network interface on the Smart Lighting Manager

supporting the Smart Lighting Commands is the UART

interface. The Smart Lighting Manager adapts the concept of a

simple command set for lighting control and configuration. The

Smart Lighting Manager uses a text-based serial command

interface as popularized by the “AT Command” model used in

early Hayes modems.

For example:

• Set the desired daylight LUX level target:

ATLUXT = 500 >> OK

The “Smart Lighting Command Interface”, shown below

between the network interface and the core of the system,

provides access to the Smart Lighting Manager’s lighting

control and configuration functions

Figure 21:

Smart Lighting Command Interface

BLE

Wi-Fi

ZigBee

BacNet

KNX

Network

Bridge

Smart Lighting Commands

UART

CLE

Smart Lighting Command Interface

AT Command Interface

AS7221

Refer to the separate ams AS7221 Smart Lighting Command Set

document for the complete command set and usage.

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AS7221 − Detailed Description

I²C Master Interface (Local Sensor Interface)

The I²C Master interface can be used to connect external sensors

(such as daylight, occupancy, CO sensors, etc.). Refer to the

separate ams Application Note for external sensor usage with

the AS7221.

I²C Feature List

Clock is set to 100kHz

7+1-bit addressing mode.

Write formats: Single-Byte-Write, Page-Write

Read formats: Random-Read, Sequential-Read

SDA input delay and SCL spike filtering by integrated

RC-components.

I²C Protocol

Figure 22:

I²C Symbol Definition

Symbol

Definition

Note

Start condition after stop

Repeated start

1 bit

Slave address

8 bit

Slave address for write

Slave address for read

Word address

Acknowledge

1 bit

No acknowledge

Data/write

1 bit

Data

Data (n)

8 bit

Data/read

8 bit

Stop condition

1 bit

WA++

Slave increment word address

During acknowledge

The above I²C symbol definition table describes the symbols

used in the following mode descriptions.

ams Datasheet

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AS7221 − Detailed Description

I²C Write Access

Byte Write and Page Write formats are used to write data to the

slave.

Figure 23:

I²C Byte Write

Data

A P

Write WA++

Figure 24:

I²C Page Write

Data 1

……..

Data n

A P

Write WA++

The transmission begins with the START condition, which is

generated by the master when the bus is in IDLE state (the bus

is free). The device-write address is followed by the word

address. After the word address any number of data bytes can

be sent to the slave. The word address is incremented internally,

in order to write subsequent data bytes on subsequent address

locations.

For reading data from the slave device, the master has to change

the transfer direction. This can be done either with a repeated

START condition followed by the device-read address, or simply

with a new transmission START followed by the device-read

address, when the bus is in IDLE state. The device-read address

is always followed by the 1st register byte transmitted from the

slave. In Read Mode any number of subsequent register bytes

can be read from the slave. The word address is incremented

internally.

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AS7221 − Detailed Description

I²C Read Access

Random, Sequential and Current Address Read are used to read

data from the slave.

Figure 25:

I²C Random Read

Data

N P

read WA++

WA++

Random Read and Sequential Read are combined formats. The

repeated START condition is used to change the direction after

the data transfer from the master.

The word address transfer is initiated with a START condition

issued by the master while the bus is idle. The START condition

is followed by the device-write address and the word address.

In order to change the data direction a repeated START

condition is issued on the 1st SCL pulse after the acknowledge

bit of the word address transfer. After the reception of the

device-read address, the slave becomes the transmitter. In this

state the slave transmits register data located by the previous

received word address vector. The master responds to the data

byte with a not-acknowledge, and issues a STOP condition on

the bus.

ams Datasheet

[v1-01] 2016-Dec-08

Page 21

Document Feedback

AS7221 − Detailed Description

Figure 26:

I²C Sequential Read

Data 1

Data n

N P

read WA++

WA++

I²C Sequential Read: Shows the format of an I²C sequential read access.

Sequential Read is the extended form of Random Read, as more

than one register-data bytes are transferred subsequently. In

difference to the Random Read, for a sequential read the

transferred register-data bytes are responded by an

acknowledgement from the master. The number of data bytes

transferred in one sequence is unlimited (consider the behavior

of the word-address counter). To terminate the transmission the

master has to send a not-acknowledge following the last data

byte and generate the STOP condition subsequently.

The AS7221 is compatible to the NXP two wire specifications.

www.nxp.com/documents/user_manual/UM10204.pdf

Version 4.0 Feb 2012 for standard mode and fast mode.

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AS7221 − Application Information

Application Information

Schematics

Figure 27:

Chromatic Color Tuning with Networking and Spectral Sensing

Constant Current

LED Driver

Dimming

Control

12V

BLE

Wi-Fi

ZigBee

BacNet

KNX

3.3V

10uF

100nF

VDD

VDDHV

Network

Bridge

PWM_1

PWM_2

PWM_3

AS7221

0..10V

Dimmer

(Inward Looking)

MODE

0_10V_DIM

OCC

MOSI

MISO

Occupancy

Sensor

Flash

Memory

3.3V

SCK

CSN_EE

ams Daylighting &

Spectral Sensing

Devices

SDA_M

SCL_M

LED_IND

GND

Figure 28:

LED Chromatic Color Tuning with Daylighting

Constant Current

LED Driver

Dimming

Control

12V

BLE

3.3V

10uF

Wi-Fi

ZigBee

BacNet

KNX

100nF

VDD

VDDHV

Network

Bridge

PWM_1

PWM_2

PWM_3

AS7221

0..10V

Dimmer

(Inward Looking)

MODE

0_10V_DIM

OCC

MOSI

MISO

Occupancy

Sensor

Flash

Memory

3.3V

SCK

CSN_EE

SDA_M

SCL_M

ams

TSL4531

LED_IND

GND

ams Datasheet

[v1-01] 2016-Dec-08

Page 23

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AS7221 − Application Information

PCB Layout

Figure 29:

Typical Layout Routing

As shown, trace routing feedthroughs with exposure directly

under the AS7221 should be avoided.

The AS7221 Smart Lighting Integration Kit (SLIK) demo board

with schematic and PCB layout documentation is available from

ams for additional design information.

Page 24

amsDatasheet

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AS7221 − Package Drawings & Markings

Package Drawings & Markings

Figure 30:

Package Drawing

AS7221

RoHS

Green

Note(s):

1. XXXXX = tracecode

2. Unless otherwise specified, all dimensions are in millimeters.

3. Tolerances: Angular ( 0.5°), Two Place Decimal ( 0.015), Three Place Decimal ( 0.010)

4. Contact finish is Au.

5. This package contains no lead (Pb).

6. This drawing is subject to change without notice.

ams Datasheet

[v1-01] 2016-Dec-08

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Document Feedback

AS7221 − PCB Pad Layout

Suggested PCB pad layout guidelines for the LGA package are

shown. Flash Gold is recommended as a surface finish for the

landing pads.

PCB Pad Layout

Figure 31:

Recommended PCB Pad Layout

0.30

0.65

Unit: mm

4.40

Note(s):

1. Unless otherwise specified, all dimensions are in millimeters.

2. Dimensional tolerances are 0.05mm unless otherwise noted.

3. This drawing is subject to change without notice.

Page 26

amsDatasheet

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[v1-01] 2016-Dec-08

AS7221 − Tape & Reel Information

Tape & Reel Information

Figure 32:

Tape & Reel Information

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ams Datasheet

[v1-01] 2016-Dec-08

Page 27

Document Feedback

AS7221 − Soldering & Storage Information

Soldering & Storage

Information

Solder Reflow Profile

The module has been tested and has demonstrated an ability

to be reflow soldered to a PCB substrate. The solder reflow

profile describes the expected maximum heat exposure of

components during the solder reflow process of product on a

PCB. Temperature is measured on top of component. The

components should be limited to a maximum of three passes

through this solder reflow profile.

Figure 33:

Recommended Reflow Soldering Profile

Profile Feature

Average temperature gradient in preheating

Soak Time

Reference

Device

2.5°C/s

2 to 3 minutes

Max 60s

SOAK

Time above 217°C (T1)

Time above 230°C (T2)

Max 50s

Time above Tpeak - 10°C (T3)

Peak temperature in reflow

Temperature gradient in cooling

Max 10s

260°C

Tpeak

Max - 5°C/s

Figure 34:

Soldering Profile Graph

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amsDatasheet

[v1-01] 2016-Dec-08

AS7221 − Soldering & Storage Information

Manufacturing Process Considerations

The AS7221 package is compatible with standard reflow

no-clean and cleaning processes including aqueous, solvent or

ultrasonic techniques. However, as an open-aperture device,

precautions must be taken to avoid particulate or solvent

contamination as a result of any manufacturing processes,

including pick and place, reflow, cleaning, integration assembly

and/or testing. Temporary covering of the aperture is allowed.

To avoid degradation of accuracy or performance in the end

product, care should be taken that any temporary covering and

associated sealants/debris are thoroughly removed prior to any

optical testing or final packaging.

Storage Information

Moisture sensitivity optical characteristics of the device can be

adversely affected during the soldering process by the release

and vaporization of moisture that has been previously

absorbed into the package. To ensure the package contains the

smallest amount of absorbed moisture possible, each device is

baked prior to being dry packed for shipping. Devices are dry

packed in a sealed aluminized envelope called a

moisture-barrier bag with silica gel to protect them from

ambient moisture during shipping, handling, and storage

before use.

Shelf Life

The calculated shelf life of the device in an unopened moisture

barrier bag is 12 months from the date code on the bag when

stored under the following conditions:

• Shelf Life: 12 months

• Ambient Temperature: <40°C

• Relative Humidity: <90%

Rebaking of the devices will be required if the devices exceed

the 12 month shelf life or the Humidity Indicator Card shows

that the devices were exposed to conditions beyond the

allowable moisture region.

Floor Life

The module has been assigned a moisture sensitivity level of

MSL 3. As a result, the floor life of devices removed from the

moisture barrier bag is 168 hours from the time the bag was

opened, provided that the devices are stored under the

following conditions:

• Floor Life: 168 hours

• Ambient Temperature: <30°C

• Relative Humidity: <60%

ams Datasheet

Page 29

[v1-01] 2016-Dec-08

Document Feedback

AS7221 − Soldering & Storage Information

If the floor life or the temperature/humidity conditions have

been exceeded, the devices must be rebaked prior to solder

reflow or dry packing.

Rebaking Instructions

When the shelf life or floor life limits have been exceeded,

rebake at 50°C for 12 hours.

Page 30

amsDatasheet

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[v1-01] 2016-Dec-08

AS7221 − Ordering & Contact Information

Ordering & Contact Information

Figure 35:

Ordering Information

Ordering

Description

Code

Delivery

Form

Delivery

Quantity

Package

Marking

Calibrated XYZ Chromatic

AS7221- BLGT Manager for Network

Enabled Smart Lighting

20-pin LGA

AS7221

Tape & Reel

2000 pcs/reel

Note(s):

1. Required companion serial flash memory (must be ams verified) is ordered from the flash memory supplier

(e.g. AT25SF041-SSHD-B from Adesto Technologies).

2. AS7221 flash memory software is available from ams.

Online product information is available at:

www.ams.com/AS7221

Buy our products or get free samples online at:

www.ams.com/ICdirect

Technical Support is available at:

www.ams.com/Technical-Support

Provide feedback about this document at:

www.ams.com/Document-Feedback

For further information and requests, e-mail us at:

ams_sales@ams.com

For sales offices, distributors and representatives, please visit:

www.ams.com/contact

Headquarters

ams AG

Tobelbader Strasse 30

8141 Premstaetten

Austria, Europe

Tel: +43 (0) 3136 500 0

Website: www.ams.com

ams Datasheet

Page 31

[v1-01] 2016-Dec-08

Document Feedback

AS7221 − RoHS Compliant & ams Green Statement

RoHS: The term RoHS compliant means that ams AG products

fully comply with current RoHS directives. Our semiconductor

products do not contain any chemicals for all 6 substance

categories, including the requirement that lead not exceed

0.1% by weight in homogeneous materials. Where designed to

be soldered at high temperatures, RoHS compliant products are

suitable for use in specified lead-free processes.

RoHS Compliant & ams Green

Statement

ams Green (RoHS compliant and no Sb/Br): ams Green

defines that in addition to RoHS compliance, our products are

free of Bromine (Br) and Antimony (Sb) based flame retardants

(Br or Sb do not exceed 0.1% by weight in homogeneous

material).

Important Information: The information provided in this

statement represents ams AG knowledge and belief as of the

date that it is provided. ams AG bases its knowledge and belief

on information provided by third parties, and makes no

representation or warranty as to the accuracy of such

information. Efforts are underway to better integrate

information from third parties. ams AG has taken and continues

to take reasonable steps to provide representative and accurate

information but may not have conducted destructive testing or

chemical analysis on incoming materials and chemicals. ams AG

and ams AG suppliers consider certain information to be

proprietary, and thus CAS numbers and other limited

information may not be available for release.

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amsDatasheet

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[v1-01] 2016-Dec-08

AS7221 − Copyrights & Disclaimer

material herein may not be reproduced, adapted, merged,

translated, stored, or used without the prior written consent of

the copyright owner.

Copyrights & Disclaimer

Devices sold by ams AG are covered by the warranty and patent

indemnification provisions appearing in its General Terms of

Trade. ams AG makes no warranty, express, statutory, implied,

or by description regarding the information set forth herein.

ams AG reserves the right to change specifications and prices

at any time and without notice. Therefore, prior to designing

this product into a system, it is necessary to check with ams AG

for current information. This product is intended for use in

commercial applications. Applications requiring extended

temperature range, unusual environmental requirements, or

high reliability applications, such as military, medical

life-support or life-sustaining equipment are specifically not

recommended without additional processing by ams AG for

each application. This product is provided by ams AG “AS IS”

and any express or implied warranties, including, but not

limited to the implied warranties of merchantability and fitness

for a particular purpose are disclaimed.

ams AG shall not be liable to recipient or any third party for any

damages, including but not limited to personal injury, property

damage, loss of profits, loss of use, interruption of business or

indirect, special, incidental or consequential damages, of any

kind, in connection with or arising out of the furnishing,

performance or use of the technical data herein. No obligation

or liability to recipient or any third party shall arise or flow out

of ams AG rendering of technical or other services.

ams Datasheet

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[v1-01] 2016-Dec-08

Document Feedback

AS7221 − Document Status

Document Status

Product Status

Definition

Information in this datasheet is based on product ideas in

the planning phase of development. All specifications are

design goals without any warranty and are subject to

change without notice

Product Preview

Pre-Development

Information in this datasheet is based on products in the

design, validation or qualification phase of development.

The performance and parameters shown in this document

are preliminary without any warranty and are subject to

change without notice

Preliminary Datasheet

Datasheet

Pre-Production

Production

Information in this datasheet is based on products in

ramp-up to full production or full production which

conform to specifications in accordance with the terms of

ams AG standard warranty as given in the General Terms of

Trade

Information in this datasheet is based on products which

conform to specifications in accordance with the terms of

ams AG standard warranty as given in the General Terms of

Trade, but these products have been superseded and

should not be used for new designs

Datasheet (discontinued)

Discontinued

Page 34

amsDatasheet

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[v1-01] 2016-Dec-08

AS7221 − Revision Information

Revision Information

Changes from 0-92 (2016-Sep-27) to current revision 1-01 (2016-Dec-08)

0-92 (2016-Sep-27) to 1-00 (2016-Dec-02)

Initial production version for release

Page

Completely revised version

1-00 (2016-Dec-02) to 1-01 (2016-Dec-08)

Updated General Description

Updated Figure 6 and notes below

Updated Figure 17

Updated Figure 27 and Figure 28

Note(s):

1. Page and figure numbers for the previous version may differ from page and figure numbers in the current revision.

2. Correction of typographical errors is not explicitly mentioned.

ams Datasheet

[v1-01] 2016-Dec-08

Page 35

Document Feedback

AS7221 − Content Guide

General Description

Key Benefits & Features

Applications

Content Guide

Block Diagram

Pin Assignments

Absolute Maximum Ratings

Electrical Characteristics

13 Detailed Description

13 AS7221 Smart Lighting Manager - Overview

14 XYZ Chromatic White Color Sensor

14 AS7221 Inputs

15 Synchronization and Reset

16 AS7221 Outputs

16 Indicator LED

17 UART and Smart Lighting Command Interface

17 UART Feature List

17 Operation

17 Transmission

17 Reception

18 Smart Lighting Command Interface

19 I²C Master Interface (Local Sensor Interface)

19 I²C Feature List

19 I²C Protocol

20 I²C Write Access

21 I²C Read Access

23 Application Information

23 Schematics

25 Package Drawings & Markings

26 PCB Pad Layout

28 Soldering & Storage Information

28 Solder Reflow Profile

29 Manufacturing Process Considerations

29 Storage Information

29 Shelf Life

29 Floor Life

30 Rebaking Instructions

31 Ordering & Contact Information

32 RoHS Compliant & ams Green Statement

33 Copyrights & Disclaimer

34 Document Status

35 Revision Information

Page 36

Document Feedback

amsDatasheet

[v1-01] 2016-Dec-08

AS7221 [AMSCO]

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