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PDF VM6101 Data sheet ( Hoja de datos )
| Número de pieza | VM6101 | |
| Descripción | color light sensor | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de VM6101 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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VM6101
I²C color light sensor
Features
www.DataSheet4U.com
■ 4-channel Y+RGB photosensor, with
integrated infrared filter
■ Wide dynamic range light to frequency
converters
■ 2-wire serial interface, I²C and SMBus
compatible
■ PWM output for direct LCD backlight control
■ Comparator logic with two programmable
thresholds and hysteresis function
■ Power down input
■ 3.0 V to 3.6 V supply range
■ Built-in clock generator, precision voltage and
current references
■ Low profile Pb-free package (RoHS compliant)
Applications
■ General purpose color measurement
■ Automatic backlighting control
■ Panel lighting
■ White goods
Pinout
VM6101V008
8-lead MLPD
Top view
SDA 1
SCL 2
INT 3
GND 4
8 TEST
R B 7 AMUX
YG
6 PD
5 VDD
y
Optical center location: (+70, +35) µm
x relative to package center.
Sensitive area: 220 x 240 µm
Description
The VM6101 is a high dynamic range 4-channel
CMOS photosensor suitable for ambient light
sensing as well as color light sensing. Light
intensity is converted linearly to a variable
frequency signal. The signal period is readable
through the two-wire serial interface.
A direct PWM output is provided for power saving
LCD backlighting applications, where backlighting
intensity adapts to the ambient light level.
Alternatively, this output can be used as an
ambient light level detector output, with two user
programmable thresholds.
A power down input puts the VM6101 in ultra low
power mode.
The VM6101 is housed in an compact 8-lead
surface mount clear plastic package, compliant to
RoHS directive.
May 2007
Rev 3
1/17
www.st.com
17
1 page  
VM6101
Functional description
The light response can be approximated by:
● Y channel:
● R channel:
● G channel:
● B channel:
EvY = 1.58e6 x count -0.960
EvR = 3.34e6 x count -0.902
EvG = 4.92e6 x count -0.944
EvB = 8.03e6 x count -0.973
The response time is: t = count / fOSC + serial interface read time (about 200 µs)
Example:
t = 9.3 ms for 300 lx.
Each channel provides three status flags and a counter value:
● RESET: This flag is set upon reset or power-down resume. The counter value is invalid
and should be discarded. This flag is cleared after a status read operation.
● OVERFLOW: at least one counter overflow occurred: the counter value is invalid and
should be discarded. This flag is cleared when a new valid counter value is available.
● READY: a new counter value is available. This flag is cleared immediately after the
status register read.
● CNT: a 27-bit counter value, mapped in 4 consecutive bytes, MSB first and right
justified.
Channel readout must always start by reading the corresponding status register. The
suggested read operation is a 5-byte read operation starting at the status register address.
Refer to Chapter 4: Register description for details.
2.2 Comparator logic
This function compares the light level (i.e. channel counter CNT) with two programmable
thresholds (TH_LO and TH_HI) and drives the INT pin accordingly. The following table
shows available configurations using TH_CFG register setup:
5/17
5 Page 
VM6101
Register description
Table 3. Register description (continued)
Addr. Bits Def.
Name
Description
0x21
0x22
[3:0]
[4:0]
0x00 PWM_FREQ
0x00 PWM_SENS
PWM output frequency (RW)(4 MSBs are reserved):
n = 0 to 15
fPWM = fOSC * 2n-18, where fOSC = 3.6 MHz.
PWM sensitivity (RW)(3 MSBs are reserved):
n = 0 to 26
0 = high sensitivity, 26 = low sensitivity. Practical values lie between 9
and 18. Refer to Figure 4: PWM duty cycle versus illumination for
typical behavior.
0x22
...
0x27
[7:0]
0x28 [7:0] 0x04 TEST_MOD
0x29 [7:0] 0x00 TEST_SEL
0x2A
...
0xFF
[7:0]
Reserved.
Reserved (RW).
Reserved (RW).
Reserved.
11/17
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet VM6101.PDF ] | |
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