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PDF TMD2671 Data sheet ( Hoja de datos )
| Número de pieza | TMD2671 | |
| Descripción | DIGITAL PROXIMITY DETECTOR | |
| Fabricantes | TAOS | |
| Logotipo |  |
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Features
D Digital Proximity Detector, LED Driver, and
IR LED in a Single Optical Module
D Proximity Detection
− Calibrated to 100-mm Detection
− Integrated IR LED and Synchronous LED
Driver
− Programmable Number of IR Pulses
− Programmable Current Sink for the IR
LED — No Limiting Resistor Needed
− Programmable Interrupt Function with
Upper and Lower Threshold
D Programmable Wait Timer
− Wait State — 65 mA Typical Current
− Programmable from 2.72 ms
to > 8 Seconds
D I2C Interface Compatible
− Up to 400 kHz (I2C Fast Mode)
D Dedicated Interrupt Pin
D 3.94 mm y 2.36 mm y 1.35 mm Package
D Sleep Mode — 2.5 mA Typical
TMD2671
DIGITAL PROXIMITY DETECTOR
TAOS144B − SEPTEMBER 2012
PACKAGE
MODULE−8
(TOP VIEW)
VDD 1
SCL 2
GND 3
8 SDA
7 INT
6 LDR
LEDA 4
5 LEDK
Package Drawing is Not to Scale
Applications
D Cell Phone Touch Screen Disable
D Automatic Speakerphone Enable
D Automatic Menu Popup
Description
The TMD2671 family of devices provides a complete proximity detection system and digital interface logic in
a single 8-pin package. The proximity detector includes a digital proximity sensor with integrated LED driver,
and IR LED. The proximity function is calibrated to 100 mm (without cover glass), thus eliminating the need for
end-equipment or sub-assembly factory calibration. The proximity detection feature operates from sunlight to
dark rooms. The wide dynamic range also allows for operation in short distance detection behind dark glass
such as with a cell phone. An internal state machine provides the ability to put the device into a low-power mode
providing very low average power consumption. The addition of the micro-optics lenses within the module
provide highly efficient transmission and reception of infrared energy, which lowers overall power dissipation
for the detection function.
The proximity function specifically targets near-field proximity 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. 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 with a simple 2-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 only generated upon a proximity event.
The TMD2671 is packaged in a very small form factor 8-pin optical package. The PCB board area required is
only 9.36 mm2, which is far smaller than discrete solutions. Also, the package height is only 1.35 mm, which
makes the TMD2671 device 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 2012, TAOS Inc.
1
1 page  
TMD2671
DIGITAL PROXIMITY DETECTOR
IR LED Characteristics, VDD = 3 V, TA = 255C
PARAMETER
TEST CONDITIONS
VF Forward Voltage
VR Reverse Voltage
PO Radiant Power
λp Peak Wavelength
Δλ Spectral Radiation Bandwidth
TR Optical Rise Time
TF Optical Fall Time
IF = 20 mA
IR = 10 μA
IF = 20 mA
IF = 20 mA
IF = 20 mA
IF = 100 mA, TW = 125 ns, duty cycle = 25%
IF = 100 mA, TW = 125 ns, duty cycle = 25%
TAOS144B − SEPTEMBER 2012
MIN TYP
1.4
5
4.5
850
40
20
20
MAX
1.5
40
40
UNIT
V
V
mW
nm
nm
ns
ns
Wait Characteristics, VDD = 3 V, TA = 255C, WEN = 1 (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP
Wait step size
WTIME = 0xFF
2.72
Wait number of integration steps
1
MAX
2.9
256
UNIT
ms
steps
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
TYP MAX UNIT
400 kHz
μs
μs
μs
μs
μs
ns
μs
μs
300 ns
300 ns
10 pF
The LUMENOLOGY r Company
r
www.taosinc.com
r
Copyright E 2012, TAOS Inc.
5
5 Page 
TMD2671
DIGITAL PROXIMITY DETECTOR
TAOS144B − SEPTEMBER 2012
Interrupts
The interrupt feature simplifies and improves system efficiency by eliminating the need to poll the sensor for
a proximity value. The interrupt mode is determined by the state of the PIEN field in the ENABLE register.
Two 16-bit-wide interrupt threshold registers allow the user to define upper and lower threshold limits. An
interrupt can be generated when the proximity data (PDATA) exceeds the upper threshold value (PIHTx) or falls
below the lower threshold (PILTx).
To further control when an interrupt occurs, the device provides an interrupt persistence feature. This feature
allows the user to specify a number of conversion cycles for which an event exceeding the proximity interrupt
threshold must persist (PPERS) before actually generating an interrupt. See the register descriptions for details
on the length of the persistence.
PIHTH(r 0x0B), PIHTL(r 0x0A) PPERS(r 0x0C, b7:4)
Prox
Integration
Prox
ADC
Channel 0
Channel 1
Prox
Data
Upper Limit
Lower Limit
PILTH(r 0x09), PILTL(r 0x08)
Prox Persistence
Figure 8. Programmable Interrupt
The LUMENOLOGY r Company
r
www.taosinc.com
r
Copyright E 2012, TAOS Inc.
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet TMD2671.PDF ] | |
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