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TSL2550 Datasheet(PDF) 9 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

Part No. TSL2550
Description  AMBIENT LIGHT SENSOR WITH SMBus INTERFACE
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Manufacturer  TAOS [TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS]
Direct Link  http://www.taosinc.com
Logo TAOS - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

TSL2550 Datasheet(HTML) 9 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

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TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029L − OCTOBER 2007
9
The LUMENOLOGY r Company
r
r
Copyright E 2007, TAOS Inc.
www.taosinc.com
The specific ADC value register read depends on the last read command written to the command register, as
described above and in the Operation section, below.
The MSB of the ADC register (VALID bit B7) is used to indicate that data has been written to the ADC register
after the device is powered up as described in Command Register section.
Bits 6 through 0 contain the 7-bit code representing the ADC count value, which is proportional to a
photodetector current. In this code, the ADC count value is represented by a piece-wise linear approximation
to a log function. The transfer function is broken into 8 chords of 16 steps each. (This code is very similar to μ-law
code used in audio compression — it differs in that it does not have a sign bit and it is not inverted.) Table 3 shows
the relationship between the CHORD and STEP bits and the CHORD and STEP numbers and values. These
are used to calculate the ADC count value.
Table 3. CHORD and STEP Numbers and Values vs Register Bits
CHORD
BITS
B6, B5, B4
C, CHORD
NUMBER
CHORD
VALUE
(Note A)
STEP
VALUE
(Note B)
STEP
BITS
B3, B2, B1, B0
S, STEP
NUMBER
000
0
0
1
0000
0
001
1
16
2
0001
1
010
2
49
4
0010
2
011
3
115
8
0011
3
100
4
247
16
0100
4
101
5
511
32
0101
5
110
6
1039
64
0110
6
111
7
2095
128
0111
7
1000
8
1001
9
1010
10
1011
11
1100
12
1101
13
1110
14
1111
15
NOTES: A. CHORD VALUE = INT (16.5
× ((2C) − 1))
B. STEP VALUE = 2C
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 Value)
(Step Number))
The ADC count value can also be expressed 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 3.


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