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NCP5680
Select FlashTrigger
CONFIG1[EXTRG)
I2C TRIGGER Selected
External Trigger Selected
I2C TRIGGER Selected
Set I2CTRIG
Set TimeOut
Send EXTLTRIGGER
Read Flash Pulse
The Flash duration is setup by
the I2C FLWIDx register
The Flash duration is equal to
the EXTL TRIGGER Pulse width
The Flash is switched OFF by
the Time Out control
Figure 12. Flash Mode of Operation
When the power flash is activated, the default Time out
is preset to 50 ms typical and can be set up to a different
timing through an I2C command. Although the NCP5680
can sustain a 255 ms time out, care must be observed, at
system level, that both the external NMOS transistors and
the LED are capable to absorb the increase of temperature
coming from the extra heat developed during a larger time
out sequence.
LED Flash Current @ Vbat=3.6V
LED1                       LED2
700
650
600
550
500
450
400
350
300
250
200
150
100
Flash Configuration
To generate a flash pulse, several registers must be preset
before a flash takes place:
FILED1 = $03 3 LED1 set up the peak current
FILED1 = $04 3 LED2 set up the peak current
FLDLY1 = $07 3 LED1 set up the delay time
FLDLY2 = $08 3 LED2 set up the delay time
FLWID1 = $0A 3 LED1 set up the pulse width time
FLWID2 = $0B 3 LED2 set up the pulse width time
VOUTREG = $0F 3 set up the output voltage value
TOUT = $14 3 set up the time out
A typical sequence is depicted here below:
? Set up the configuration registers to control the flash
sequence
? Set up the pulse width, the amplitude and the delay
time
50
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5
FILED(A)
Figure 13. Flash ILED Current vs. Vsense
CONFIG0
Select the Photo Sense Mode of Operation
Select the Automatic LED check during a pulse
Select LED2
Select LED1
B7
?
?
?
?
B6
?
?
?
?
B5
1/0
?
?
?
B4
?
1/0
?
?
B3
?
?
?
?
B2
?
?
?
?
B1
?
?
1/0
?
B0
?
?
?
1/0
Typical Sequence:
? send the I2C address
? select the CONFIG0 register
? activate LED1 and LED2
$7C
$01
$03
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