AN2507 datasheet(29/31 Pages) STMICROELECTRONICS

29 / 31 page

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

Device address + R/W bit

Command register address

Data of the command register

Table 29.

2nd I2C data packet for restart of the FLASH mode

Byte

Hex

Binary

Comment

Device address + R/W bit

Command register address

Data of the command register

Table 30.

3rd I2C data packet to restart the FLASH mode

Byte

Hex

Binary

Comment

Device address + R/W bit

Command register address

Data of the command register

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