TSL2550 View Datasheet(PDF) - Unspecified
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TSL2550 Datasheet PDF : 14 Pages
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TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029 – SEPTEMBER 2002
Table 4. CHORD and STEP Numbers and Values vs Register Bits
CHORD
BITS
B6, B5, B4
000
001
010
011
100
101
110
111
C, CHORD
NUMBER
0
1
2
3
4
5
6
7
CHORD
VALUE
(Note A)
0
16
49
115
247
511
1039
2095
STEP
VALUE
(Note B)
1
2
4
8
16
32
64
128
NOTES: A. CHORD VALUE = INT (16.5 × ((2C) – 1))
B. STEP VALUE = 2C
STEP
BITS
B3, B2, B1, B0
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
S, STEP
NUMBER
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
The ADC count value is obtained by adding the CHORD VALUE and the product of the STEP NUMBER and
STEP VALUE (which depends on CHORD NUMBER).
ADC Count Value + ((Chord Value) ) (Step Size) (Number of Steps))
The ADC count value is as a formula:
ADC Count Value + (INT (16.5 ((2C * 1))) ) (S (2C))
where:
C
is the CHORD NUMBER (0 to 7)
S
is the STEP NUMBER (0 to 15)
as defined in Table 4.
Copyright E 2002, TAOS Inc.
10
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www.taosinc.com
The LUMENOLOGYr Company
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