TCS3772

COLOR LIGHT-TO-DIGITAL CONVERTER

with PROXIMITY SENSING

TAOS145B − SEPTEMBER 2012

5

The LUMENOLOGY

r Company

r

r

Copyright

E 2012, TAOS Inc.

www.taosinc.com

PARAMETER

TEST CONDITIONS

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

(Note 1)

1

256

steps

ADC counts per step (Note 1)

PTIME = 0xFF

0

1023

counts

ADC count value

PPULSE = 1 (Note 3)

1350

1900

counts

ADC output responsivity

0.175

0.211

0.247

counts/

Noise (Notes 1 2 3)

E

0 PTIME

0xFF PPULSE

8 (Note 6)

2

%FS

Noise (Notes 1, 2, 3)

2% FS

LED pulse count (Note 1)

0

255

pulses

LED pulse period

14.0

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

Maximum operating distance

(Notes 1, 4, 5)

PDRIVE = 0 (100 mA), PPULSE = 64

Emitter:

Object: 16

(white surface)

Optics: Open view (no glass, no optical attenuation)

30

inches

NOTES: 1. Parameter is ensured by design or characterization and is not tested.

2. Proximity noise is defined as one standard deviation of 600 samples.

3. Proximity noise typically increases as

√PPULSE

4. Greater operating distances are achievable with appropriate optical system design considerations. See available TAOS application

notes for additional information.

5. Maximum operating distance is dependent upon emitter and the reflective properties of the object’s surface.

6. Proximity noise test was done using the following circuit:

TCS3772

1

mF

22

W

15.0

W

1

34

GND

LDR

PARAMETER

TEST CONDITIONS

CHANNEL

MIN

TYP

MAX

UNIT

Wait step size

WTIME = 0xFF

2.27

2.4

2.56

ms

Wait number of steps (Note 7)

1

256

steps

NOTE 7: Parameter ensured by design and is not tested.