VCNL4100 Datasheet, PDF (8/17 Pages) Vishay Siliconix – High Sensitivity Long Distance Proximity and Ambient Light Sensor with I2C Interface

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VCNL4100
Vishay Semiconductors
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
Rev. 1.2, 30-Aug-16
8
Document Number: 84319
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