TMD26721 datasheet(5/29 Pages) AMSCO

5 / 29 page

TMD2672

DIGITAL PROXIMITY DETECTOR

TAOS149C − AUGUST 2012

E 2012, TAOS Inc.

The LUMENOLOGY

r Company

www.taosinc.com

Operating Characteristics, VDD = 3 V, TA = 255C (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Active — LDR pulse off

195

250

IDD

Supply current

Wait state

μA

IDD

Supply current

Sleep state — no I2C activity

2.2

μA

INT SDA output low voltage

3 mA sink current

0.4

VOL

INT, SDA output low voltage

6 mA sink current

0.6

I LEAK

Leakage current, SDA, SCL, INT pins

−5

μA

I LEAK

Leakage current, LDR pin

−5

μA

SCL SDA input high voltage

TMD26721

0.7 VDD

VIH

SCL, SDA input high voltage

TMD26723

1.25

SCL SDA input low voltage

TMD26721

0.3 VDD

VIL

SCL, SDA input low voltage

TMD26723

0.54

Proximity Characteristics, VDD = VLEDA = 3 V, TA = 255C, PEN = 1 (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

IDD

Supply current

LED On

LED On, PDRIVE = 0

100

LEDA current (Note 1)

LED On, PDRIVE = 1

ILEDA

LEDA current (Note 1)

LED On, PDRIVE = 2

LED On, PDRIVE = 3

12.5

PTIME

ADC conversion steps

256

steps

PTIME

ADC conversion time

PTIME = 0xFF ( = 1 conversion step)

2.58

2.73

2.9

PTIME

ADC counts per step

PTIME = 0xFF ( = 1 conversion step)

1023

counts

PPULSE

LED pulses (Note 5)

255

pulses

LED On

LED pulse width

PPULSE = 1, PDRIVE = 0

7.3

μs

LED pulse period

PPULSE = 2, PDRIVE = 0

16.0

μs

Proximity response, no target

(offset)

PPULSE = 8, PDRIVE = 0, PGAIN = 4

×, (Note 2)

100

counts

Prox count, 100-mm target

(Note 3)

73 mm

× 83 mm, 90% reflective Kodak Gray Card,

PGAIN = 4

×, PPULSE = 8, PDRIVE = 0, PTIME = 0xFF

(Note 4)

450

520

590

counts

NOTES: 1. Value is factory-adjusted to meet the Prox count specification. Considerable variation (relative to the typical value) is possible after

adjustment.

2. Proximity offset varies with power supply characteristics and noise.

3. ILEDA is factory calibrated to achieve this specification. Offset and crosstalk directly sum with this value and is system dependent.

4. No glass or aperture above the module. Tested value is the average of 5 consecutive readings.

5. These parameters are ensured by design and characterization and are not 100% tested.

6. Proximity test was done using the following circuit. See the Application Information: Hardware section for recommended

application circuit.

TMD2672

VDD

GND

LDR

LEDK

LEDA

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