TSL2672 Datasheet, PDF (6/31 Pages) ams AG – DIGITAL PROXIMITY DETECTOR

TSL2672
DIGITAL PROXIMITY DETECTOR
TAOS133 − MAY 2012
Proximity Characteristics, V_DD = 3 V, T_A = 255C, PGAIN = 1y, PEN = 1 (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
I_DD Supply current
ADC conversion time step size
LDR pulse on
PTIME = 0xFF
3
2.58 2.73
mA
2.9 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
λ_p = 850 nm, E_e = 263.4 μW/cm²,
PTIME = 0xFB, PPULSE = 4
CH0 diode
CH1 diode
1500 2000
900 1200
2500
counts
1500
lid ^{ADC output responsivity}
Gain scaling, relative to 1× gain
a _setting
λ_p = 850 nm, PTIME = 0xFB, PPULSE = 1
PGAIN = 2×
PGAIN = 4×
PGAIN = 8×
CH0 diode
CH1 diode
1.90
counts/
1.14
μW/cm²
2
4
×
8
ill ^{v Noise (Notes 1, 2, 3)}
E_e = 0, PTIME = 0xFB, PPULSE = 4
(Note 6)
CH0 diode
CH1 diode
0.5
% FS
0.5
LED pulse count (Note 1)
0
255 pulses
LED pulse period
16.0
μs
t _{LED pulse width — LED on time}
7.3
μs
G ^{120 mA: PDRIVE = 0 & PDL = 0}
87 116
145
s _{60 mA: PDRIVE = 1 & PDL = 0}
58
A ^{t 30 mA: PDRIVE = 2 & PDL = 0}
29
s ^{n LED drive current}
I_SINK sink current @
1.6 V, LDR pin
15 mA: PDRIVE = 3 & PDL = 0
15 mA: PDRIVE = 0 & PDL = 1
14.5
12.9
mA
7.5 mA: PDRIVE = 1 & PDL = 1
6.4
e _{3.8 mA: PDRIVE = 2 & PDL = 1}
3.2
m ^{t1.9 mA: PDRIVE = 3 & PDL = 1}
1.6
a ⁿ _{Maximum operating distance}
o ^{(Notes 1, 4, 5)}
PDRIVE = 0 and PDL = 0 (116 mA), PPULSE = 64
Emitter: λ_p = 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)
18
inches
c 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.
l _{3. Proximity noise typically increases as √PPULSE}
4. Greater operating distances are achievable with appropriate optical system design considerations. See available TAOS application
a notes for additional information.
5. Maximum operating distance is dependent upon emitter and the reflective properties of the object’s surface.
ic ^{6. Proximity noise test was done using the following circuit:}
V_DD
22 W
Techn ^1mF
V_DD
1
TSL2672
3
GND
4
LDR
15.0 W
The LUMENOLOGY r Company
r
r
www.taosinc.com
Copyright E 2012, TAOS Inc.
5