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PDF TSL2671 Data sheet ( Hoja de datos )
| Número de pieza | TSL2671 | |
| Descripción | DIGITAL PROXIMITY DETECTOR | |
| Fabricantes | TAOS | |
| Logotipo |  |
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Features
D Proximity Detection with an Integrated LED
Driver in a Single Device
D Proximity Detection
− Programmable Number of IR Pulses
− Programmable Current Sink for the IR
LED — No Limiting Resistor Needed
− Programmable Interrupt Function with
Upper and Lower Threshold
− Covers a 2000:1 Dynamic Range
D Programmable Wait Timer
− Programmable from 2.72 ms
to > 8 Seconds
− Wait State — 65 mA Typical Current
D I2C Interface Compatible
− Up to 400 kHz (I2C Fast Mode)
− Dedicated Interrupt Pin
D Small 2 mm y 2 mm ODFN Package
D Sleep Mode — 2.5 mA Typical Current
TSL2671
DIGITAL PROXIMITY DETECTOR
TAOS118 − JANUARY 2011
PACKAGE FN
DUAL FLAT NO-LEAD
(TOP VIEW)
VDD 1
SCL 2
6 SDA
5 INT
GND 3
4 LDR
Package Image Not Actual Size
Applications
D Cell Phone Touch Screen Disable
D Notebook/Monitor Security
D Automatic Speakerphone Enable
D Automatic Menu Popup
Description
The TSL2671 family of devices provides a complete proximity detection system and digital interface logic in a
single 6-pin package. The device includes a digital proximity sensor with integrated LED driver for the required
external IR LED. The proximity function offers a wide range of performance, with four programmable LED drive
currents and a pulse repetition range of 1 to 32 pulses. The proximity detection circuitry compensates for
ambient light, allowing it to operate in environments ranging from bright sunlight to dark rooms. This wide
dynamic range also allows operation in short-distance detection applications behind dark glass, such as cell
phones. An internal state machine provides the ability to put the device into a low-power mode for very low
average power consumption.
The proximity function specifically targets near-field proximity applications. In cell phones, for example, the
proximity detection function can detect when the user positions the phone close to their ear. The device is fast
enough to provide proximity information at the high repetition rate needed when answering a phone call. This
provides both improved green power saving capability and the added security to lock the screen when the user
may accidently deploy a touch.
Communication with the device is accomplished through a simple two-wire I2C interface with data rates up to
400 kHz. An interrupt output pin is provided for connection to the host processor. This interrupt pin can be used
to eliminate the need to poll the device on a repetitive basis. There is also a digital filter that compares the
proximity ADC results to programmed values so that an interrupt is generated only upon a proximity event.
The TSL2671 is supplied in a very small form factor 2-mm × 2-mm, 6-pin optical package, requiring very little
PCB area. Also, the package height is only 0.65 mm high, which makes the TSL2671 suitable for very thin
mechanical applications.
The LUMENOLOGY r Company
r
Texas Advanced Optoelectronic Solutions Inc.
1001 Klein Road S Suite 300 S Plano, TX 75074 S (972r) 673-0759
www.taosinc.com
Copyright E 2011, TAOS Inc.
1
1 page  
TSL2671
DIGITAL PROXIMITY DETECTOR
AC Electrical Characteristics, VDD = 3 V, TA = 255C (unless otherwise noted)
PARAMETER†
TEST CONDITIONS
MIN
f(SCL)
Clock frequency (I2C only)
0
t(BUF)
Bus free time between start and stop condition
1.3
t(HDSTA)
Hold time after (repeated) start condition. After
this period, the first clock is generated.
0.6
t(SUSTA)
Repeated start condition setup time
t(SUSTO)
Stop condition setup time
t(HDDAT)
Data hold time
t(SUDAT)
Data setup time
t(LOW)
SCL clock low period
t(HIGH)
SCL clock high period
tF Clock/data fall time
tR Clock/data rise time
Ci Input pin capacitance
† Specified by design and characterization; not production tested.
0.6
0.6
0
100
1.3
0.6
TAOS118 − JANUARY 2011
TYP MAX UNIT
400 kHz
μs
μs
μs
μs
μs
ns
μs
μs
300 ns
300 ns
10 pF
PARAMETER MEASUREMENT INFORMATION
SCL
t(BUF)
SDA
t(LOW)
t(R)
VIH
VIL
t(HDSTA)
t(HDDAT)
VIH
VIL
t(F)
t(HIGH) t(SUSTA)
t(SUDAT)
P
Stop
Condition
S
Start
Condition
SCL
S
Start
Stop
t(LOWSEXT)
SCLACK
SCLACK
t(LOWMEXT)
t(LOWMEXT)
t(LOWMEXT)
SDA
Figure 1. Timing Diagrams
t(SUSTO)
P
The LUMENOLOGY r Company
r
www.taosinc.com
r
Copyright E 2011, TAOS Inc.
5
5 Page 
TSL2671
DIGITAL PROXIMITY DETECTOR
TAOS118 − JANUARY 2011
State Diagram
The following state diagram shows a more detailed flow for the state machine. The device starts in the sleep
mode. The PON bit is written to enable the device. A 2.72-ms Start Delay will occur before entering the start
state. If the PEN bit is set, the state machine will step through the proximity accumulate, then proximity ADC
conversion states. As soon as the conversion is complete, the state machine will move to the Wait Check state.
If the WEN bit is set, the state machine will then cycle through the wait state. If the WLONG bit is set, the wait
cycles are extended by 12× over normal operation. When the wait counter terminates, the state machine will
move to the 2.72-ms Wait Delay state before returning to the Start state.
PON = 1 Sleep
Start
Delay
PON = 0
2.72 ms
Start
1 to 255 LED Pulses
Pulse Frequency: 62.5 kHz
Time: 16.3 ms − 4.2 ms PEN = 1
Prox
Check PEN = 0
WEN = 0
5.44 ms
Wait
Delay
Prox
Accum
Wait
Check
1 to 256 steps
Step: 2.72 ms
Time: 2.72 ms − 696 ms
Prox
ADC
Recommended − 2.72 ms 1023 Counts
WEN = 1
Wait
Figure 11. Expanded State Diagram
WLONG = 0
1 to 256 steps
Step: 2.72 ms
Time: 2.72 ms − 696 ms
WLONG = 1
1 to 256 steps
Step: 32.6 ms
Time: 32.6 ms − 8.35 s
The LUMENOLOGY r Company
r
www.taosinc.com
r
Copyright E 2011, TAOS Inc.
11
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet TSL2671.PDF ] | |
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