LM3559TLX National Semiconductor Corporation, LM3559TLX Datasheet - Page 26

• Manufacturer Part Number: LM3559TLX
• Description: Synchronous Boost Flash Driver With Dual 900 Ma High Side Current Sources 1.8a Total Flash Current
• Manufacturer: National Semiconductor Corporation

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TORCH BRIGHTNESS REGISTER
Bits [2:0] of the Torch Brightness Register set the Torch cur-
rent for LED1. Bits [5:3] set the Torch current for LED2. (see
Table
FLASH BRIGHTNESS REGISTER
Bits [3:0] of the Flash Brightness Register set the Flash cur-
rent for LED1. Bits [7:4] set the Flash current for LED2. (see
Table
(Not Used)
LED2 Flash Current Select Bits
0000 = 56.25 mA (112.5 mA total)
0001 = 112.5 mA (225 mA total)
0010 = 168.75 mA (337.5 mA total)
0011 = 225 mA (450 mA total)
0100 = 281.25 mA (562.5 mA total)
0101 = 337.5 mA (675 mA total)
0110 = 393.75 mA (787.5 mA total)
0111 = 450 mA (900 mA total)
1000 = 506.25 mA (1012.5 mA total)
1001 = 562.5 mA (1125 mA total)
1010 = 618.75 mA (1237.5 mA total)
1011 = 675 mA (1350 mA total)
1100 = 731.25 mA (1562.5 mA total)
1101 = 787.5 mA (1575 mA total) Default
1110 = 843.75 mA (1687.5 mA total)
1111 = 900 mA (1800 mA total)
(FC2A)
(N/A)
Bit 7
Bit 7
3).
4).
(FC2B)
Bit 6
(N/A)
Bit 6
LED2 Torch Current Select Bits
000 = 28.125 mA (56.25 mA total)
001 = 56.25 mA (112.5 mA total)
010 = 84.375 mA (168.75 mA total) default
011 = 112.5 mA (225 mA total)
100 = 140.625 mA (281.25 mA total)
101 = 168.75 mA (337.5 mA total)
110 = 196.875 mA (393.75 mA total)
111 = 225 mA (450 mA total)
(FC2C )
Bit 5
TABLE 3. Torch Brightness Register Descriptions
(TC2A)
TABLE 4. Flash Brightness Register Descriptions
Bit 5
(FC2D)
Bit 4
(TC2B)
Bit 4
LED1 Flash Current Select Bits
0000 = 56.25 mA (112.5 mA total)
0001 = 112.5 mA (225 mA total)
0010 = 168.75 mA (337.5 mA total)
0011 = 225 mA (450 mA total)
0100 = 281.25 mA (562.5 mA total)
0101 = 337.5 mA (675 mA total)
0110 = 393.75 mA (787.5 mA total)
0111 = 450 mA (900 mA total)
1000 = 506.25 mA (1012.5 mA total)
1001 = 562.5 mA (1125 mA total)
1010 = 618.75 mA (1237.5 mA total)
1011 = 675 mA (1350 mA total)
1100 = 731.25 mA (1562.5 mA total)
1101 = 787.5 mA (1575 mA total) Default
1110 = 843.75 mA (1687.5 mA total)
1111 = 900 mA (1800 mA total)
26
(FC1A )
(TC2C)
Bit 3
Bit 3
LED1 Torch Current Select Bits
000 = 28.125 mA (56.25 mA total)
001 = 56.25 mA (112.5 mA total)
010 = 84.375 mA (168.75 mA total) default
011 = 112.5 mA (225 mA total)
100 = 140.625 mA (281.25 mA total)
101 = 168.75 mA (337.5 mA total)
110 = 196.875 mA (393.75 mA total)
111 = 225 mA (450 mA total)
(FC1B)
(TC1A)
Bit 2
Bit 2
(TC1B)
(FC1C)
Bit 1
Bit 1
(TC1C)
(FC1D)
Bit 0
Bit 0