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AN2507 Datasheet(PDF) 29 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) 29 Page - STMicroelectronics

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AN2507
Examples of register setup for each mode
29/31
●
Packet 2
Sets FLASH mode with 1.5 s duration. Dimming is not set again as it is same as before.
●
Packet 3
Sets FLASH mode with 1.5 s duration. Dimming remains untouched.
●
Packet 4
Sets FLASH mode with 1 s duration. Dimming remains untouched.
Please refer to Figure 22 for more details about the I2C-bus packets timing.
The solution described above is using a software termination of the FLASH pulse. (It is
timed out by the internal timer.) The FLASH pulse could be also terminated by setting the
TRIG pin to low after 4 seconds. In this case, the fourth packet could be the same as
packets Packet 2 and Packet 3, because the timing of the FLASH is done by the TRIG pin
and it is not necessary to change the value of FTIM in the COMMAND REGISTER.
This way of periodical reloading of the COMMAND REGISTER can be used to achieve a
continuous FLASH light. In this case, it is very strongly recommended to guarantee an
efficient cooling of both the LED and the chip, otherwise the light can be interrupted by
activation of the thermal protections.
Table 28.
1st I2C data packet to restart 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
Table 29.
2nd I2C data packet for restart of 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
Table 30.
3rd I2C data packet to restart 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
DA
1
1
0
1
1
0
1
0
Data of the command register



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