TCS3771

COLOR LIGHT-TO-DIGITAL CONVERTER

with PROXIMITY SENSING

TAOS110A − MARCH 2011

5

The LUMENOLOGY

r Company

r

r

Copyright

E 2011, TAOS Inc.

www.taosinc.com

PARAMETER

TEST CONDITIONS

CONDITION

MIN

TYP

MAX

UNIT

Supply current

LDR pulse on

3

mA

ADC conversion time step size

PTIME = 0xFF

2.27

2.4

2.56

ms

ADC number of integration steps

1

256

steps

ADC counts per step

0

1023

counts

IR LED pulse count

0

255

pulses

LED pulse period

Two or more pulses

14

μs

LED pulse width — LED on time

6.3

μs

PDRIVE = 0

80

106

132

LED drive current

PDRIVE = 1

50

mA

LED drive current

LDR pin

PDRIVE = 2

25

mA

PDRIVE = 3

12.5

Dark count value

900

counts

Red channel

PPULSE = 2 (See note 1)

1000

3000

counts

Clear channel

PPULSE = 2 (See note 1)

1000

3000

counts

Operating distance (See note 2)

30

inches

NOTES: 1. The specified light intensity is 100% modulated by the pulse output of the device so that during the pulse output low time, the light

intensity is at the specified level, and 0 otherwise.

2. Proximity Operating Distance is dependent upon emitter properties and the reflective properties of the proximity surface. The

nominal value shown uses an IR emitter with a peak wavelength of 850nm and a 20

° half angle. The proximity surface used is a

90% reflective (white surface) 16

× 20-inch Kodak Gray Card. 60 mw/SR, 100 mA, 64 pulses, open view (no glass). Note: Greater

distances are achievable with appropriate system considerations.

PARAMETER

TEST CONDITIONS

CHANNEL

MIN

TYP

MAX

UNIT

Wait step size

WTIME = 0xFF

2.27

2.4

2.56

ms

Wait number of steps

1

256

steps