Page 8

ams Datasheet

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[v1-01] 2018-Mar-14

TCS3772 − Electrical Characteristics

Figure 10:

Proximity Characteristics, VDD = 3 V, TA = 25ºC, PEN = 1 (unless otherwise noted)

Note(s):

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 ams 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 Figure 11, “Proximity Noise Test Circuit,” on page 9.

Parameter

Conditions

Min

Typ

Max

Units

IDD

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)

1256

steps

ADC counts per step (1)

PTIME = 0xFF

0

1023

counts

ADC count value

λp = 850 nm, Ee = 770.1 μW/cm2,

PTIME = 0xFB, PPULSE= 1 (3)

1350

1900

counts

ADC output responsivity

λp = 850 nm, PTIME = 0xFF,

PPULSE = 1 (3)

0.175

0.211

0.247

counts/

μW/

cm2

Noise (1) (2) (3)

Ee = 0, PTIME = 0xFF, PPULSE = 8

(6)

2

% FS

LED pulse count (1)

0

255

pulses

LED pulse period

14.0

μs

LED pulse width – LED on time

6.3

μs

LED drive current

ISINK sink current @

1.6 V, LDR pin

PDRIVE = 0

80

106

132

mA

PDRIVE = 1

50

PDRIVE = 2

25

PDRIVE = 3

12.5

Maximum operating

distance (1) (4) (5)

PDRIVE = 0 (100 mA), PPULSE = 64

Emitter:

λp = 850 nm, 20° half angle,

and 60 mW/sr

Object: 16 × 20-inch, 90% reflective

Kodak Gray Card (white surface)

Optics: Open view (no glass, no

optical attenuation)

30

inches