VCNL4100 datasheet(7/17 Pages) VISHAY

7 / 17 page

VCNL4100

www.vishay.com

Vishay Semiconductors

Rev. 1.2, 30-Aug-16

Document Number: 84319

For technical questions, contact: sensorstechsupport@vishay.com

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000

APPLICATION INFORMATION

Pin Connection with the Host

VCNL4100 is a cost effective solution of a long distance proximity sensor with I2C interface. The standard serial digital interface

easily accesses “light intensity” by using simple calculations.

Application circuitry below shows the added MOSFET which is driven by the ASIC’s pin 2. A 22 k

 pull-up resistor needs to be

added here. The RLED defines the current through the IRED. A small 0.1 μF is sufficient at VDD for power supply noise rejection,

but a 2.2 μF should be placed at VIRED to provide the energy for the IRED.

For the I2C bus design, the pull-up voltage refers to the I/O specification of the baseband due to its “open drain” design. The

pull-high resistors for the I2C bus lines are recommended to be

 2.2 k.

Fig. 10 - Application Diagram

Notes

•VDD range: 2.5 V to 3.6 V and VIRED is recommended 5.0 V

• Power path of VDD and VIRED should be routed separately up to stable power source.

•The RLED resister value should be evaluated within ready-made application and the current through VCNL4100-internal IRED should not

exceed 800 mA.



Digital Interface

VCNL4100 applies single 8-bit slave address 0xC0 (HEX) following I2C protocol. All operations can be controlled by the

command register. The simple command structure helps users easily program the operation setting and latch the light data from

VCNL4100. As fig. 11 shows, VCNL4100’s I2C command format is simple for read and write operations between VCNL4100

and the host. The white sections indicate host activity and the gray sections indicate VCNL4100’s acknowledgement of the host

access activity. Write word and read word protocols are suitable for accessing registers particularly for 16-bit ALS data and

8-bit PS data. Interrupt can be cleared by reading data out from register: INT_Flag.

Fig. 11 - Command Protocol Format

INT

SCLK

VCNL4100

LED

CATHODE

0.1 μF

GND

SCK

SDA

IRED

2.2 μF

2.2 k

pull up

PMOS

2.7

LED

LED+

LED-

2.2 k

20 k

MCU

SCLK

SDAT

8.2 k

INT

Slave Address

Command Code

Data Byte Low

Data Byte High

818

Send Byte

Write Command to VCNL4100

Slave Address

Command Code

Slave Address

Data Byte Low

Data Byte High

Receive Byte

Read Data from VCNL4100

S = start condition

P = stop condition

A = acknowledge

Shaded area = VCNL4100 acknowledge

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