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L99LD01 датащи(PDF) 39 Page - STMicroelectronics

номер детали L99LD01
подробное описание детали  High efficiency constant current LED driver for automotive applications
PDF  69 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L99LD01 датащи(HTML) 39 Page - STMicroelectronics

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L99LD01
SPI functional description
68
Control registers 2
Address:
0x02h
Type:
R/W
Reset:
0101 1110 0001 1111b
15
14
13
12
11
10
9
876543210
Fdev[2:0]
Fmod[1:0]
Dith_En
Led_Curr[4:0]
Max_Curr[4:0]
Bit [15:13] Fdev[2:0]: frequency deviation of the internal oscillator (see Table 12)
Bit [12:11] Fmod[1:0]: frequency modulation of the internal oscillator (see Table 13)
Bit [10] Dith_En: enable or disable random dither effect.
If this bit is set Dithering is enabled;
If the bit is reset, the dithering is disabled
Bit [9:5] Led_Curr[4:0]: these bits set the LED current.
The LED current is given by:
0.05 + (0.2 * Led_Curr[4:0]d) / 31) / (RSENSE) [A] (typ)
Where Led_Curr[4:0]d = decimal value of Led_Curr[4:0]
Bit [4:0] Max_Curr[4:0]: these bits set the maximum input current.
The internal current limiter voltage threshold is:
1 + (2.5 * Max_Curr[4:0]d) / 31 in [V] (typ)
Considering the gain of the amplifier of 10, the current limitation is:
(1 + 2.5 * Max_Curr[4:0]d / 31) / (10 RSHUNT) (typ);
Where Max _Curr[4:0]d = decimal value of Max_Curr[4:0]
Table 12. Internal oscillator frequency deviation settings
Fdev[2]
Fdev[1]
Fdev[0]
Frequency deviation
00
0
0 %
00
1
5 %
01
0
10 %
01
1
15 %
10
0
20 %
10
1
25 %
11
0
30 %
Table 13. Internal oscillator frequency modulation settings
Fmod[1]
Fmod[0]
Frequency modulation
00
1.95 kHz
01
3.9 kHz
10
7.8 kHz
1
1
15.6 kHz



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