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AN2507 Datasheet(PDF) 28 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) 28 Page - STMicroelectronics

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Examples of register setup for each mode
AN2507
28/31
The data packet which has to be sent is in the table below.
The picture below shows the TRIG pin and the I2C bus timings.
Figure 21.
Multiple flashes handled by the TRIG pin
8.5
Example 5: A FLASH pulse longer than 1.5 s
Let's suppose that RFL = 0.27 Ω and the targeted value of the FLASH current is 600 mA. The
task is to make a single FLASH pulse with a 4 seconds duration.
It is necessary to reload FTIM in the COMMAND REGISTER before the internal FLASH
timer reaches zero. This guarantees that the FLASH does go on and does not stop after
1.5 sec.
The first packet must contain also the DIMMING REGISTER data, if they are different from
those which were used in the previous operation.
●
Packet 1
Sets FLASH mode with 1.5 s duration and the proper dimming.
Table 26.
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
DF
1
1
0
1
1
1
1
1
Data of the command register
4
0D
0
0
0
0
1
1
0
1
Data of the dimming register
TRIG pin
100
ms
200
ms
TRIG_EN bit
I
2C bus packet
1400 ms
Table 27.
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
DF
1
1
0
1
1
1
1
1
Data of the command register
4
0D
0
0
0
0
1
1
0
1
Data of the dimming register



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