TMD27711 datasheet(6/33 Pages) TAOS

6 / 33 page

TMD2771

DIGITAL ALS

and PROXIMITY MODULE

TAOS143B − SEPTEMBER 2012

The LUMENOLOGY

r Company

E 2012, TAOS Inc.

www.taosinc.com

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

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

IDD

Supply current — LDR pulse on

ADC conversion time step size

PTIME = 0xFF

2.72

ADC number of integration steps

256

steps

ADC counts per step

PTIME = 0xFF

1023

counts

Proximity IR LED pulse count

255

pulses

Proximity pulse period

16.3

μs

PDRIVE = 0 (100% current level)

100

150

LED current @ V 600 mV LDR pin sink (Note 1)

PDRIVE = 1 (50% current level)

ILEDA LED current @ V 600 mV, LDR pin sink (Note 1)

PDRIVE = 2 (25% current level)

PDRIVE = 3 (12.5% current level)

12.5

TLDR

On time per pulse

PDRIVE = 1

7.2

μs

Proximity response, no target (offset)

PDRIVE = 0, PPULSE = 8 (Note 2)

100

counts

Prox count, 100-mm target (Note 3)

73 mm

× 83 mm, 90% reflective Kodak

Gray Card,

PPULSE = 8, PDRIVE = 0, PTIME =

0xFF (Note 4)

414

520

624

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. No reflective surface above the module. 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.

TMD2771

VDD

GND

LDR

LEDK

LEDA

IR LED Characteristics, VDD = 3 V, TA = 255C

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Forward Voltage

IF = 20 mA

1.4

1.5

Reverse Voltage

IR = 10 μA

Radiant Power

IF = 20 mA

4.5

λp

Peak Wavelength

IF = 20 mA

850

Δλ

Spectral Radiation Bandwidth

IF = 20 mA

Optical Rise Time

IF = 100 mA, TW = 125 ns, duty cycle = 25%

Optical Fall Time

IF = 100 mA, TW = 125 ns, duty cycle = 25%

Wait Characteristics, VDD = 3 V, TA = 255C, WEN = 1 (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Wait step size

WTIME = 0xFF

2.72

2.9

Wait number of integration steps

256

steps

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