ISL29147

7

FN8409.3

January 6, 2015

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Typical Performance Curves

FIGURE 5. PROXIMITY SENSITIVITY (Note 11)

FIGURE 6. ALS SENSITIVITY (Note 12)

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.

0

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100

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250

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150

DISTANCE (mm)

IRDR 250mA

IRDR 125mA

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WAVELENGTH (nm)

RANGE: 900 Lux

ALS RESPONSE (BLUE)

CIE 1924 PHOTOPIC CURVE

AMBIENT LIGHT LEVEL (LUX)

0

8k

16k

24k

32k

40k

15

10

5

50%

10%

0

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015

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75

90

ANGLE (°)

-90 -75 -60 -45

-30 -15