LP5521 datasheet(27/51 Pages) TI2

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LP5521

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SNVS441I – JANUARY 2007 – REVISED NOVEMBER 2016

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X means do not care whether 1 or 0.

7.5.3.6 Trigger

Wait or send triggers can be used to, for example, synchronize operation between different channels. Send

trigger command takes sixteen 32-kHz clock cycles, and wait for trigger takes at least sixteen 32 kHz clock

cycles. The receiving channel stores sent triggers. Received triggers are cleared by wait for trigger command if

received triggers match to channels defined in the command. Channel waits for until all defined triggers have

been received.

External trigger input signal must be at least two 32-kHz clock cycles (= 61 μs typical) long to be recognized.

Trigger output signal is three 32-kHz clock cycles (92 μs typical) long. External trigger signal is active low; that is,

when trigger is sent/received the pin is pulled to GND. Sent external trigger is masked; that is, the device which

has sent the trigger does not recognize it. If send and wait external trigger are used on the same command, the

send external trigger is executed first, then the wait external trigger.

Table 19. Trigger Command

wait trigger <5:0>

send trigger <5:0>

EXT

NAME

VALUE(d)

DESCRIPTION

wait trigger<5:0>

0-31

Wait for trigger for the channel(s) defined. Several triggers can be defined in the same

command. Bit 0 is R, bit 1 is G, bit 2 is B and bit 5 is external trigger I/O. Bits 3 and 4

are not in use.

send trigger<5:0>

0-31

Send trigger for the channel(s) defined. Several triggers can be defined in the same

command. Bit 0 is R, bit 1 is G, bit 2 is B and bit 5 is external trigger I/O. Bits 3 and 4

are not in use.

X means do not care whether 1 or 0.

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