ISL29038

7

FN7851.1

January 23, 2015

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Typical Performance Curves

FIGURE 6. PROXIMITY SENSITIVITY (Note 13)

FIGURE 7. ALS SENSITIVITY (Note 14)

FIGURE 8. PROXIMITY AMBIENT LIGHT REJECTION (Note 15)

FIGURE 9. ALS ANGULAR SENSITIVITY (Note 16)

NOTES:

13. The ISL29038 Proximity distance sweeps with different IRDR LED current settings using an 18% Grey card reflector.

14. The ISL29038 Ambient Light Sensor Spectral response when compared to a theoretical CIE 1924 Photopic curve. The ‘Blue’ line shows the ISL29038

response and the ‘Red’ line depicts the CIE 1924 Photopic curve.

15. The ISL29038 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 ISL29038), the PROX data error is under 2%. At 50% initial

PROX count (severe optical leakage), the PROX data error is about 7%.

16. The Ambient Light Sensor Angular Sensitivity of the ISL29038 using a white LED light source.

0

10

20

30

40

50

60

70

80

90

100

020

80

60

40

18% GREY CARD PROXIMITY DISTANCE (mm)

125mA

250mA

31.25mA

62.5mA

0

10

20

30

40

50

60

70

80

90

100

300

400

500

600

700

800

900

1000

1100

WAVELENGTH (nm)

RANGE: 2k Lux

ALS RESPONSE (BLUE)

CIE 1924 PHOTOPIC CURVE

AMBIENT LIGHT LEVEL (LUX)

0

8k

16k

24k

32k

40k

15

10

5

50%

10%

0

0

10

20

30

40

50

60

70

80

90

100

-90

-60

-30

0

30

60

90

ANGLE (°)