ISL29147_15 Datasheet, PDF (7/15 Pages) Intersil Corporation – Low Power Ambient Light and Proximity Sensor with Enhanced Infrared Rejection

ISL29147
Typical Performance Curves
250
200
IRDR 250mA
150
100
IRDR 125mA
50
0
0
50
100
150
DISTANCE (mm)
FIGURE 5. PROXIMITY SENSITIVITY (Note 11)
100
90
80
CIE 1924 PHOTOPIC CURVE
70
60
50
40
30
20
ALS RESPONSE (BLUE)
RANGE: 900 Lux
10
0
WAVELENGTH (nm)
FIGURE 6. ALS SENSITIVITY (Note 12)
15
100
90
80
10
70
60
50%
50
40
5
30
10%
0
0
8k
16k
24k
32k
40k
AMBIENT LIGHT LEVEL (LUX)
20
10
0-90 _{-75 -60 -45 -30 -15 0 15 30 45 60 75 90}
ANGLE (°)
FIGURE 7. PROXIMITY AMBIENT LIGHT REJECTION (Note 13)
FIGURE 8. ALS ANGULAR SENSITIVITY (Note 14)
NOTES:
11. Figure 5 shows ISL29147 Proximity distance sweeps with different IRDR LED current settings using an 18% Grey card reflector.
12. Figure 6 shows ISL29147 Ambient Light Sensor Spectral response when compared to a theoretical CIE 1924 Photopic curve. The ‘Blue’ line shows
the ISL29147 response and the ‘Red’ line depicts the CIE 1924 Photopic curve.
13. Figure 7 shows the ISL29147 Proximity Ambient Light Rejection using a Norwood Solar Emulator. At 40k Lux ambient light level, the Proximity
Washout Count (Reg 0x0D[7:1]) is 127 indicating a saturation in Proximity Signal processing path. The Proximity Washout bit 0x0D[0] is active at
approximately 90% of the maximum level. At 10% initial PROX count (due to optical leakage from IR LED to the ISL29147), the PROX data error is
under 2%. At 50% initial PROX count (severe optical leakage), the PROX data error is about 7%.
14. Figure 8 shows the Ambient Light Sensor Angular Sensitivity of the ISL29147 using a white LED light source.
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7
FN8409.3
January 6, 2015