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AN2507 Datasheet(PDF) 25 Page - STMicroelectronics

Part # AN2507
Description  This application note explains the design of a FLASH LED driver using the STCF03 device
PDF  31 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2507 Datasheet(HTML) 25 Page - STMicroelectronics

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AN2507
Examples of register setup for each mode
25/31
It is necessary to write 4 bytes to STCF03 to make a FLASH.
8.2
Example 2: 25 mA TORCH
Let's suppose that RFL = 0.27 Ω, RTR = 1.8 Ω and the targeted value of the TORCH current is
25 mA.
The reference voltage must be set to 56 mV to achieve 25 mA in TORCH mode with the
resistor values mentioned above. The value of TDIM (4 bits) must be set to 0x3 to set up the
reference voltage to 56 mV.
Bit PWR_ON of the command register must be set to 1.
Bit TRIG_EN of the command register must be set to 0.
Bit TCH_ON of the command register must be set to 0.
Bit NTC_ON of the command register can be set to any value, because NTC is
automatically ON, when TORCH mode is active. Setting this bit to 0 does not switch off the
NTC.
Table 14.
DIMMING register data for the FLASH mode
DIM_REG
TDIM_3
TDIM_2
TDIM_1
TDIM_0
FDIM_3
FDIM_2
FDIM_1
FTIM_0
00
0
0
1
1
0
1
MSB
LSB
Table 15.
I2C data packet for activating the FLASH mode
Byte
Hex
Binary
Comment
1
62
0
1
1
0
0
0
1
0
Device address + R/W bit
2
00
0
0
0
0
0
0
0
0
Command register address
3
D7
1
1
0
1
0
1
1
1
Data of the command register
4
0D
0
0
0
0
1
1
0
1
Data of the dimming register
Table 16.
COMMAND register data for the TORCH mode
CMD_REG
PWR_ON
TRIG_EN
TCH_ON
NTC_ON
FTIM_3
FTIM_2
FTIM_1
FTIM_0
10
1
1
0
0
0
0
MSB
LSB
Table 17.
DIMMING register data for the TORCH mode
DIM_REG
TDIM_3
TDIM_2
TDIM_1
TDIM_0
FDIM_3
FDIM_2
FDIM_1
FDIM_0
00
1
1
0
0
0
0
MSB
LSB



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