AN2507 datasheet(28/31 Pages) STMICROELECTRONICS

28 / 31 page

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

Device address + R/W bit

Command register address

Data of the command register

Data of the dimming register

TRIG pin

100

200

TRIG_EN bit

2C bus packet

1400 ms

Table 27.

I2C data packet for activating the FLASH mode

Byte

Hex

Binary

Comment

Device address + R/W bit

Command register address

Data of the command register

Data of the dimming register

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