1 What: /sys/bus/iio/devices/iio:devic 1 What: /sys/bus/iio/devices/iio:deviceX/proximity_on_chip_ambient_infrared_suppression
2 Date: January 2011 2 Date: January 2011
3 KernelVersion: 2.6.37 3 KernelVersion: 2.6.37
4 Contact: linux-iio@vger.kernel.org 4 Contact: linux-iio@vger.kernel.org
5 Description: 5 Description:
6 From ISL29018 Data Sheet (FN66 6 From ISL29018 Data Sheet (FN6619.4, Oct 8, 2012) regarding the
7 infrared suppression: 7 infrared suppression:
8 8
9 Scheme 0, makes full n (4, 8, 9 Scheme 0, makes full n (4, 8, 12, 16) bits (unsigned) proximity
10 detection. The range of Scheme 10 detection. The range of Scheme 0 proximity count is from 0 to
11 2^n. Logic 1 of this bit, Sche 11 2^n. Logic 1 of this bit, Scheme 1, makes n-1 (3, 7, 11, 15)
12 bits (2's complementary) proxi 12 bits (2's complementary) proximity_less_ambient detection. The
13 range of Scheme 1 proximity co 13 range of Scheme 1 proximity count is from -2^(n-1) to 2^(n-1).
14 The sign bit is extended for r 14 The sign bit is extended for resolutions less than 16. While
15 Scheme 0 has wider dynamic ran 15 Scheme 0 has wider dynamic range, Scheme 1 proximity detection
16 is less affected by the ambien 16 is less affected by the ambient IR noise variation.
17 17
18 == =========================== 18 == =============================================
19 0 Sensing IR from LED and amb 19 0 Sensing IR from LED and ambient
20 1 Sensing IR from LED with am 20 1 Sensing IR from LED with ambient IR rejection
21 == =========================== 21 == =============================================
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