Page 10

ams Datasheet

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[v1-31] 2018-Apr-04

TCS3771 − Electrical Characteristics

Figure 10:

Proximity Characteristics, VDD = 3V, TA = 25°C, Gain = 16, PEN = 1 (unless otherwise noted)

Note(s):

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. 60mw/SR, 100mA, 64 pulses, open view (no glass). Greater distances are

achievable with appropriate system considerations.

Figure 11:

Wait Characteristics, VDD = 3V, TA = 25°C, Gain = 16, WEN = 1 (unless otherwise noted)

Parameter

Test Conditions

Condition

Min

Typ

Max

Unit

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

1256

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

LED drive current

ISINK sink current @

600mV, LDR pin

PDRIVE = 0

80

106

132

mA

PDRIVE = 1

50

PDRIVE = 2

25

PDRIVE = 3

12.5

Dark count value

Ee = 0, PTIME = 0xFB, PPULSE = 2

900

Counts

Red channel

λP = 850nm, Ee = 45.3μW/cm

2,

PTIME = 0xFB, PPULSE = 2 (1)

1000

3000

Counts

Clear channel

λP = 850nm, Ee = 45.3μW/cm

2,

PTIME = 0xFB, PPULSE = 2 (1)

1000

3000

Counts

Operating distance (2)

30

Inches

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