CPS303AT
Digital Ambient Light Sensor

CPS303AT
Digital Ambient Light Sensor（I2C Protocol Interface ）Data Sheet© Yitoa Micro Technology Corp., 2020
Last Update 16-Nov./2020

Note: The contents of this document may be revised without prior notice for improvement of the product.

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CPS303AT

Digital Ambient Light Sensor

1. Product summary
CPS303AT is a light sensor with integrated photo diode that has spectral sensitivity near to luminosity factor,
current amplifier circuit, and digital conversion circuit in a single chip.
CPS303AT outputs detection result in 16-bit digital value via I2C interface.
CPS303AT enables to improve visivility of indication and life of light source, and reduce power consumption bybrightness adjustment and on/off control of monitor displays etc.

2. Features
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Small and low-profile package (TCOB: 2.0 mm x 2.0 mm x 0.58mm)
Spectral sensitivity characteristics near to luminosity factor
Output characteristics proportional to illuminance of environmental lights
Small output dependence to light source
Compatible with I2C interface
Shut down function by software sleep
Flexible setting of integration time and resolution setting
Supports reflow soldering
Pb free and RoHS compatible
Halogen free

3. Maximum rating
Item
Voltage
Storage temperature

Code
VDDmaxTstg

Rating5-40～+85

Unit
V℃

4. Recommended operating conditions
Item

CodeCondition

Min.

Typ.

Max.

Unit

Supply voltage

VDD-

2.7-

3.6

V+70℃

-

VDD+0.3

V-

VDD+0.3
0.4
400V
V
pF

Operating temperature-20
Ｔopr
I2C busVbus
Rp=2.2KΩ
1.8
Pull-up voltage (*1)
H level input voltage
Vih2.6
L level input voltage
Vil-0.5
BUS capacityCbus(*1): pull up registance depends on Cbus capacitance and Vbus voltage.

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5. Pin functions
PIN No.
12346.

CodeGND
SDA
SCL
VDD

I/O type
GND
I/O(open drain)I
VDD

Pin function
GND pin
SDA pin for I2C
SCL pin for I2C
VDD pin

Block diagram

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7. Electrical and optical properties
Measuring conditions: VDD=3.3VItem
Wavelength ofpeak sensitivity

Ta=25℃

CodeCondition

Min.

Typ.

Max.

Unitλp(*2)

515

nm

Smin

CLKS=“0”， IT=0.5T，Gain: x1.0(*1) (*2)

0.1lx

Smax

CLKS=“1”， IT=1T，
Gain：x0.5(*1) (*2)

100000lx

Illuminancedetection range

Illuninance count

Scnt1

Light receiving
sensitivity

Scnt2

Darkness countDoffsｅｔDynamic
consumption
current

Iddd

Static current

Idds

CLKS=“1”， IT=1T，
Gain：×1.0
Ev=100lx(*1)
CLKS=“1”， IT=1T，
Gain：×1.0
(*1)

90120

150

count

0.9

1.21.5count/lx

005count

1.9mA

1.0uA

Typ.
Max.
0x25 （0100101）
400
0.4-Unit

CLKS=“1”， IT=1T，Gain：×1.0
E=0lx（dark condition）
CLKS=“1”， IT=1T，Gain：×1.0
E=0lx（dark condition）
CLKS=“1”， IT=1T，Gain：×1.0
E=0lx（dark condition）*1 Light source: White LED*2 It is design guarantee item

Measurement conditions of I2C: VDD=3.3V Ta=25℃
Item
CodeCondition
I2C address
ADDR 7bit
I2C clock frequencyfclk
SDA output voltage
Vol
Rp=2.2kΩ
Input/output pinCicapacity
SDA output fall time
Rp=2.2kΩtf
Cbus=400pF

Min.
‐0--

20pF--250

nsOutput rise time of SCL/SDA will be decided by of time constant of Cbus x Rp.

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4kHzV

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Digital Ambient Light Sensor

8. Register map
Slave Address：0x25 (0100101) (Write: 01001010，Read: 01001011)
Index
No.

00hCodeCTRL

Register name

Details

System control registers

Set light receiving sensitivity“00” ： ×1
PD_SM[7:6] “01“ ： ×2
“10” ： ×0.5
“11” ： unused
Set integration time“00” ： 0.5T
“01” ： 1T
ITMG[5:4]“10“ ： 2T“11” ： 4T“T” is decided by clock selection bit (CLKS)
Set clock“1” ： 1T＝6.7mS
CLKS[3]“0” ： 1T＝67mS
Set on/off of software sleep“0“ : Sleep off Normal operation
SLP[0]“1” :Sleep on Switch to power save mode
（I2C communication is possible）

R/W

Initial

R/W

R/W
19h

R/W

R/W

01h

SDTL

Measurement
result registers (lower)

DT[7:0]Store the lower bits of measurement result.
Measurement result will be 16bit by adding
upper bits of 02h.

R-02h

SDTH

Measurement
result registers (higher)DT[15:8]

Store the upper bits of measurement result.
Measurement result will be 16bit by adding
lower bits of 01h.

R-0Fh

FTST

Test control registers

TST[7:0]

Keep the initial setting (00h).

R/W

00h

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9. I2C Timing Characteristics

t(F)

t(R)
t(LOW)SCLt（HDSTA)t(HIGH)t(BUF)SDA

t(SUSTO)t(HDDAT)t(SUDAT)t(SUSTA)

VIH
VIL

P
Stop
Condition

SSP

Start
Condition

Condition ： VDD=3.3V

Ta=25℃Item

Codeｆ(SCL)t(BUF)t(HDSTA)t(SUSTA)t(SUSTO)t(HDDAT)t(SUDAT)ｔ(LOW)ｔ(HIGH)t（F）
ｔ（R）

Clock frequency
Bus free time *Start condition hold time *Start condition setup time *Stop condition setup time *Data hold time *Data setup time *SCL “L” period *SCL “H” period *SCL，SDA fall time *SCL，SDA rise time ** Design guarantee item.

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MAX
400

1.3
0.6
0.6
0.6
0.9
100
1.3
0.6
250
300

unit
kHzuSuSuSuSuSnSuSuSnSnSConfidential
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Digital Ambient Light Sensor

10. Reference data

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11. External dimensions

ＴＣＯＢ ： ２．０ｍｍ×２．０ｍｍ×０．５８ｍｍ

TOP VIEW

Pin No.
①②③④

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BOTTOM VIEW

Pin NameGND
SDA
SCL
VDD

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Digital Ambient Light Sensor

１2． To Customers:
If any product described in this document corresponds to goods or technologies which are restricted to export under theJapanese “Foreign Exchange and Foreign Trade Control Law” or other applicable laws of a government having
jurisdiction, then, appropriate permission for exporting such products or technologies are required to be taken.
In relation to use of the information contained in this document, no license is granted to you with regard to any
intellectual property rights of YITOA MICRO TECHNOLOGY CORPORATION (hereinafter referred to as "MTC")
or any third party. MTC will not be liable in any way for any claim related to infringement of intellectual property
rights or other rights of third parties arising from the use of the information contained in this document.
The information concerning the circuits and other related information contained in this document is provided forreferential purpose only to explain the operation or application of the products, and it will be your sole responsibility touse such information for designing of your own devices. MTC will not be liable in any way for any loss or damages
incurred to you or any other party arising from the use of such information.
In general, failures in semiconductor products occur at certain percentage. Therefore, upon designing your own
devices, please give due consideration to the redundancy, safety of your devices and methods to prevent occurrence ofmalfunction in order to avoid personal injuries, accidents or other social damages which might happen as the result of a
failure of semiconductor products used in your devices.
For application of MTC products to medical equipment or other purposes where high reliability of the device isrequired, please contact MTC sales representative.
The contents of this documents may be subject to change without any notice, due to improvement of reliability or
design of the products.
It is inhibited to reproduce or copy the whole or part of this document without the permission of MTC.

YITOA Micro Technology Corporation
Sales Division
465 Osato-cho, Kofu-shi, Yamanashi
400-0053 Japan
Phone (81)-55- 241 – 8622

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