Ingeniero

Umgebungslicht- und Näherungssensor mit IR Emitter
Ambient Light and Proximity Sensor with Integrated IR Emitter
Lead (Pb) Free Product - RoHS Compliant
SFH 7773

Preliminary datasheet

Wesentliche Merkmale

Features

• Näherungssensor- Detektionsbereich bis
150mm
- 850nm Emitter, im Gehäuse integriert
- Umgebungslicht-unempfindlich
• Umgebungslichtsensor
- 0.03lx - 65000lx
-Gute Linearität
- Spektrale Empfindlichkeit ähnlich dem
menschlichen Auge
• I2C interface
- 100kHz / 400kHz und 3.4MHz Mode
- verschiedene Messmoden programmierbar
(Standby, Triggered, Free-running)
- I²C-Adresse: 0111 000X
• typ 2μA Stromverbrauch im Standby Mode

• Proximity sensor (PS)
- Detection-range up to 150mm
- 850nm IR emitter integrated in package
- Insensitive to ambientlight
• Ambient light sensor (ALS)
- 0.03lx - 65000lx
- High linearity
- Srel well matched to the human eye

Anwendungen

Applications

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• I2C interface
- 100kHz / 400kHz and 3.4MHz mode
- Measurement modes programmable
(Standby, Triggered, Free-running)
- I²C slave address: 0111 000X
• Current consumption typ. 2μA in Standby mode

Mobiltelefone
PDAs undNotebooks
Kameras
Consumer-Produkte

Typ
Type
SFH 7773
2012-02-20

Mobile phones
PDAs and notebooks
Cameras
Consumer products

Bestellnummer
Ordering Code
Q65111A1258
1

SFH 7773
Application diagram and basic information

• Blocking capacitors for VDD and VLED are required for proper operation of the device. Based on the
power supply quality the capacitor values can bereduced.
• Proposed size for the pull-up resistors is 560 Ohm.

Short Evaluation program
Adress

Command

Action

0x80

Write 03

Ambient light Sensor in FREE-RUNNING mode

0x81

Write 03

Proximity Sensor in FREE-RUNNING mode

0x8C

Read data

read LSByte data from ambient light measurement

0x8D

Read data

read MSByte data from ambient light measurement

0x8F

Readdata

read data from proximity measurement

Wait 110 ms

2012-02-20

2

SFH 7773

I2C interface
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1.8V I/O-logic level for SDA and SCL
I/O-pins are open drain type and logic high level is set with external pull-up resistor
SFH 7773 operates in slave mode with address 0x38.
Designed for the I2C-modes: Standard (100 kb/s), Fast (400 kb/s) and High Speed (3.4 Mb/s)Combined format is supported (see I2C Bus specification UM10204 from NXP) for data reading
Block READ and WRITE modes are available. In these modes several registers can be read or written
during a single I2C traffic period. Registers are returned in a cyclic manner until the bus master sends
the stop condition. E.g. if master uses block read and starts from register 0x8C, the slave returnsthe
following register values: 0x8C, 0x8D, 0x8E, 0x8F, 0x90, 0x91, 0x92, 0x93, 0x94 and so on until the
master sends stop condition.
• Interrupt pin (INT): open-drain output (like SDA and SCL)

VDD
3

7 SDA

I2C

Analog / amplifier

6 SCL

digital
5 INT

+
proximity

ambient
light

dataregister

LED
1 VLED

driver

4
GND

2012-02-20

2
GNDLED

3

8
CATHSFH 7773
Measurement modes

IDD is below 2μA and the device is inactive. Other units may use the I2C bus without

OFF

any restrictions; I/O pins and INT are in Z state. There is no sink current through the
LED
STAND-BY

This is the initial mode after power-up. IDD is below 5μA. No measurement is
performed. Device can be activated by I2C bus communication. Data registers can
be readand written. The data will be stored in the registers when the device goes
from TRIGGERED or FREE-RUNNING to STAND-BY.

TRIGGERED

Every measurement is separately initiated by MCU. This mode can be used for
ambient light sensor and proximity sensor. Measurement data are available in the
registers after a defined delay time.

FREE-RUNNING

Measurements are triggered internally by...