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PDF TCS3771 Data sheet ( Hoja de datos )
| Número de pieza | TCS3771 | |
| Descripción | Color Light-To-Digital Converter | |
| Fabricantes | ams | |
| Logotipo |  |
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General Description
TCS3771
Color Light-To-Digital Converter with
Proximity Sensing
The TCS3771 family of devices provides red, green, blue, and
clear (RGBC) light sensing and proximity detection (when
coupled with an external IR LED). They detect light intensity
under a variety of lighting conditions and through a variety of
attenuation materials. The proximity detection feature allows a
large dynamic range of operation for use in short distance
detection behind dark glass such as in a cell phone or for longer
distance measurements for applications such as presence
detection for monitors or laptops. The programmable proximity
detection enables continuous measurements across the entire
range. In addition, an internal state machine provides the ability
to put the device into a low power mode in between RGBC and
proximity measurements providing very low average power
consumption.
The TCS3771 is directly useful in lighting conditions containing
minimal IR content such as LED RGB backlight control, reflected
LED color sampler, or fluorescent light color temperature
detector. With the addition of an IR blocking filter, the device is
an excellent ambient light sensor, color temperature monitor,
and general purpose color sensor.
The proximity function is targeted specifically towards
battery-powered mobile devices, LCD monitor, laptop, and
flat-panel television applications. In cell phones, the proximity
detection can detect when the user positions the phone close
to their ear. The device is fast enough to provide proximity
information at a high repetition rate needed when answering
a phone call. It can also detect both close and far distances so
the application can implement more complex algorithms to
provide a more robust interface. In laptop or monitor
applications, the product is sensitive enough to determine
whether a user is in front of the laptop using the keyboard or
away from the desk. This provides both improved green power
saving capability and the added security to lock the computer
when the user is not present.
Ordering Information and Content Guide appear at end of
datasheet.
ams Datasheet, Confidential
[v1-20] 2014-Aug-06
Page 1
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TCS3771 − Pin Assignments
Pin Assignments
Package drawing not to scale.
The TCS3771 pin assignments are described below:
Figure 3:
Pin Diagram of Package FN Dual Flat No-Lead (Top View)
Figure 4:
Terminal Functions
Terminal
Name
No
VDD 1
SCL 2
GND
3
LDR 4
INT 5
SDA 6
Type
Description
Supply voltage
I I2C serial clock input terminal - clock signal for I2C serial data
Power supply ground. All voltages are referenced to GND.
O LED driver for proximity emitter - up to 100mA, open drain
O Interrupt - open drain (active low)
I/O I2C serial data I/O terminal - serial data I/O for I2C
ams Datasheet, Confidential
[v1-20] 2014-Aug-06
Page 5
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TCS3771 − Electrical Characteristics
Figure 12:
AC Electrical Characteristics, VDD = 3V, TA = 25°C (unless otherwise noted)
Symbol
Parameter (1)
f(SCL)
t(BUF)
t(HDSTA)
t(SUSTA)
t(SUSTO)
t(HDDAT)
t(SUDAT)
t(LOW)
t(HIGH)
tF
tR
Ci
Clock frequency (I2C only)
Bus free time between start and stop
condition
Hold time after (repeated) start
condition. After this period, the first
clock is generated.
Repeated start condition setup time
Stop condition setup time
Data hold time
Data setup time
SCL clock low period
SCL clock high period
Clock/data fall time
Clock/data rise time
Input pin capacitance
Test
Conditions
Min
Typ
Max
Unit
0 400 kHz
1.3 μs
0.6 μs
0.6 μs
0.6 μs
0 μs
100 ns
1.3 μs
0.6 μs
300 ns
300 ns
10 pF
Note(s) and/or Footnote(s):
1. Specified by design and characterization; not production tested.
ams Datasheet, Confidential
[v1-20] 2014-Aug-06
Page 11
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TCS3771.PDF ] | |
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