VCNL4100

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Vishay Semiconductors

Rev. 1.2, 30-Aug-16

8

Document Number: 84319

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

Function Description

VCNL4100 applies a 16-bit high resolution ALS that provides the best ambient light sensing capability up to 0.011375 lx/step

which works well under a low transmittance lens design (dark lens). A flexible interrupt function of ALS (register: ALS_CONF) is

also supported. The INT signal will not be asserted by VCNL4100 if the ALS value is not over high INT threshold window level,

or lower than low INT threshold window level of ALS. As long as the ALS INT is asserted, the host can read the data from

VCNL4100.

For proximity sensor function, VCNL4100 supports different kinds of mechanical design to achieve the best proximity detection

performance for any color object. The basic PS function settings, such as duty ratio, integration time, interrupt, and PS

enable / disable and persistence, are handled by the register: PS_CONF1. Duty ratio controls the PS response time. Integration

time represents the duration of the energy being received. The interrupt is asserted when the PS detection levels over the high

threshold level setting (register: PS_THDH) or lower than low threshold (register: PS_THDL). If the interrupt function is enabled,

the host reads the PS output data from VCNL4100 that saves host loading from periodically reading PS data. More than that,

INT flag (register: INT_Flag) indicates the behavior of INT triggered under different conditions. PS persistence (PS_PERS) sets

up the PS INT asserted conditions as long as the PS output value continually exceeds the threshold level.

Descriptions of each slave address operation are shown in table 1.

TABLE 1 - COMMAND CODE AND REGISTER DESCRIPTION

COMMAND



CODE

REGISTER

NAME

R / W

DEFAULT

VALUE

FUNCTION DESCRIPTION

00H_L

ALS_CONF

R / W

00H

ALS integration time, persistence, interrupt, and function enable / disable

00H_H

Reserved

R / W

00H

Reserved

01H_L

ALS_THDH_L

R / W

00H

ALS high interrupt threshold LSB byte

01H_H

ALS_THDH_M

R / W

00H

ALS high interrupt threshold MSB byte

02H_L

ALS_THDL_L

R / W

00H

ALS low interrupt threshold LSB byte

02H_H

ALS_THDL_M

R / W

00H

ALS low interrupt threshold MSB byte

03H_L

PS_CONF1

R / W

00H

PS duty ratio, integration time, persistence, and PS enable / disable

03H_H

PS_CONF2

R / W

00H

PS gain, ITB, interrupt setting

04H_L

PS_CONF3

R / W

00H

PS active forced, averaging, background light cancellation setting

04H_H

PS_SPO

R / W

00H

Set initial value to “0xA0” or “0x20”

05H_L

Reserved

R / W

00H

Reserved

05H_H

Reserved

R / W

00H

Reserved

06H_L

PS_THDL

R / W

00H

PS low interrupt threshold setting

06H_H

PS_THDH

R / W

00H

PS high interrupt threshold setting

07H_L

Reserved

R / W

00H

Reserved

07H_H

Reserved

R / W

00H

Reserved

08H_L

PS_Data

R

00H

PS output data

08H_H

Reserved

R

00H

Reserved

09H_L

ALS_Data_L

R

00H

ALS LSB output data

09H_H

ALS_Data_M

R

00H

ALS MSB output data

0AH_L

Reserved

R

00H

Reserved

0AH_H

Reserved

R

00H

Reserved

0BH_L

Reserved

R

00H

Reserved

0BH_H

INT_Flag

R

00H

ALS, PS interrupt flags