參數(shù)資料
型號(hào)： TSL2550D
廠商： TAOS Inc.
英文描述： AMBIENT LIGHT SENSOR WITH SMBus INTERFACE
中文描述： 常溫與SMBus接口光傳感器
文件頁(yè)數(shù)： 9/20頁(yè)
文件大?。?/td> 280K
代理商： TSL2550D
TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029L
OCTOBER 2007
9
The
LUMENOLOGY
Company
Copyright 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
000
C, CHORD
NUMBER
CHORD
VALUE
(Note A)
0
STEP
VALUE
(Note B)
1
STEP
BITS
B3, B2, B1, B0
S, STEP
NUMBER
0
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
0
1
2
3
4
5
6
7
8
9
001
010
011
100
101
110
111
1
2
3
4
5
6
7
16
49
115
247
511
1039
2095
2
4
8
16
32
64
128
10
11
12
13
14
15
NOTES: A. CHORD VALUE = INT (16.5
×
((2
C
)
1))
B. STEP VALUE = 2
C
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
((2
C
1)))
(S
(2
C
))
where:
C
S
as defined in Table 3.
is the CHORD NUMBER (0 to 7)
is the STEP NUMBER (0 to 15)
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