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PDF TMD2672 Data sheet ( Hoja de datos )
| Número de pieza | TMD2672 | |
| 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 Register Set- and Pin-Compatible with the
TMD2671 Series
D Proximity Detection
− Reduced Proximity Count Variation *
− Programmable Offset Control Register *
− Saturation Indicator *
− Programmable Integration Time and Offset
− Current Sink Driver for IR LED
− 16,000:1 Dynamic Range
D Maskable Proximity Interrupt
− Programmable Upper and Lower
Thresholds with Persistence Filter
D Power Management
− Low Power 2.2 mA Sleep State with User-
Selectable Sleep-After-Interrupt Mode *
− 90 mA Wait State with Programmable Wait
Time from 2.7 ms to > 8 seconds
D I2C Fast Mode Compatible Interface
− Data Rates up to 400 kbit/s
− Input Voltage Levels Compatible with VDD
or 1.8-V Bus
D 3.94 mm y 2.36 mm y 1.35 mm Package
* New or improved feature
TMD2672
DIGITAL PROXIMITY DETECTOR
TAOS149C − AUGUST 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 Mobile Handset Touchscreen Control and
Automatic Speakerphone Enable
D Mechanical Switch Replacement
D Paper Alignment
End Products and Market Segments
D Mobile Handsets, Tablets, Laptops and
HDTVs
D White Goods
D Toys
D Digital Signage
D Printing
Description
The TMD2672 family of devices provides a complete proximity detection system and digital interface logic in
a single 8-pin surface mount module. The devices are register-set and pin-compatible with the TMD2671 series
and includes new and improved proximity detection features. The proximity detection includes improved
signal-to-noise and accuracy. A proximity offset register allows compensation for optical system crosstalk
between the IR LED and the sensor. To prevent false proximity data measurement readings, a proximity
saturation indicator bit signals that the internal analog circuitry has reached saturation. Interrupts have been
enhanced with the addition of a sleep-on-interrupt feature that also allows for a single cycle operation. The
device internal state machine provides the ability to put the device in a low-power mode in between proximity
measurements, providing very low average power consumption.
The proximity detection system includes an LED driver and an IR LED, which are factory trimmed to eliminate
the need for end-equipment calibration due to component variations.
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  
TMD2672
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%
TAOS149C − AUGUST 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 time
WTIME = 0xFF (= 1 wait step)
2.73
Wait 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 
TMD2672
DIGITAL PROXIMITY DETECTOR
TAOS149C − AUGUST 2012
Interrupts
The interrupt feature simplifies and improves system efficiency by eliminating the need to poll the sensor for
proximity values outside a user-defined range. While the interrupt function is always enabled and its status is
available in the Status register (0x13), the output of the interrupt state can be enabled using the proximity
interrupt enable (PIEN) field in the Enable register (0x00).
Two 16-bit interrupt threshold registers allow the user to set limits below and above a desired proximity range.
An interrupt can be generated when the proximity data (PDATA) falls below the proximity interrupt low threshold
(PILTx) or exceeds the proximity interrupt high threshold (PIHTx).
It is important to note that the thresholds are evaluated in sequence, first the low threshold, then the high
threshold. As a result, if the low threshold is set above the high threshold, the high threshold is ignored and only
the low threshold is evaluated.
To further control when an interrupt occurs, the device provides an interrupt persistence feature. The
persistence filter allows the user to specify the number of consecutive out-of-range proximity occurrences
before an interrupt is generated. The persistence filter register (0x0C) allows the user to set the proximity
persistence filter (PPERS) values. See the persistence filter register for details on the persistence filter values.
Once the persistence filter generates an interrupt, it will continue until a special function interrupt clear command
is received (see Command register).
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 9. 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 TMD2672.PDF ] | |
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