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NCP5680
? Byte#1 3 physical I2C address = %0111 1100 (Write)
/ %0111 1101 (Read)
? Byte#2 3 select the internal register to read
? Byte#3 3 Data stored into the selected register.
Note: the STATUS register is Read only and no byte can be
stored from the I2C port into this register.
Table 6. I2C Physical address byte (first byte is $7C if Write or $7D is Read)
B7
0
B6
1
B5
1
B4
1
B3
1
B2
1
B1
0
B0
R/W
BYTE#1
BYTE#2
BYTE#3
SCL
SDA
B7 B6 B5 B4 B3 B2 B1 B0 ACK B7 B6 B5 B4 B3 B2 B1 B0 ACK B7 B6 B5 B4 B3 B2 B1 B0 ACK
Start
NCP5680 address = $7C
Read/Write bit = Low ? > Write Data
= High ? > Write Data
NCP5680 returns ACK
ACK = Low ? > byte accepted
NCP5680 Function Selection
Function = $71 ? > Set Up LED1 ILED
ILED = 1000mA
DATA applies to the
selected register
I2C transmit completed
Figure 22. Typical I2C programming Sequence
Example: select the NCP5680 interface ($7C), then select
LED1 output current register, then send the value to be
stored into the LED1 register.
To read the STATUS register, the protocol is slightly
different and five I2C cycles are necessary:
? Byte#1 3 physical I2C address = %0111 1100 (Write)
to write the STATUS register
? Byte#2 select the STATUS register to read = $17
? Byte#3 3 send an irrelevant data byte ($FF)
? Force a STOP condition
? Force a START condition
? Byte#4 3 physical I2C address = %0111 1101 (Read) to
read the STATUS register
? Byte#5 3 the NCP5680 returns the STATUS contain on
the SDA line. The MCU must maintain the SCL signal
active.
LED Checking Function
Although the power transistors are external to the
NCP5680 chip, provisions have been made, at silicon level,
to protect the system against fault developed during
operation.
The first element, in regard to the power flash, is an
automatic time out sequence engaged when a flash is
activated. Such protection will automatically switch off the
output current if the pulse width exceeds the time out limit
(maximum 255 ms). Similarly, the time out function is
automatically de ? activated when the Torch/Video mode of
operation is selected by software. In this case, the
Beside the thermal shutdown procedure embedded into
the silicon, the second protection feature is the Vout to
Ground short circuit protection: the output current is
automatically reduced to 60 mA typical, (100 mA max)
when such a short is developed across the output voltage
pin and ground.
According to the power LED manufacturers, an Anode
to Cathode short might develop in case of failure: such a
situation is detected by the NCP5680 and the associated
current loop is automatically disconnected. The test
procedure shall be launched by forcing the CKPRC bit in
the CONFIG0 register and the procedure is activated upon
the positive going slope of this bit. During the check, a
1 mA / 20 m s width typical bias current is forced through the
LED. To send a new check sequence, the CKPRC bit must
be forced back to low and a new positive edge can be sensed
by forcing CKPRC high.
Finally, the system permanently monitor the Drain/
Ground voltage of each external NMOS to detect any fault
condition in the power flash circuit.
A specific command shall be send by the I2C to check the
circuit without any on going sequence. The system makes
sure the LED is connected to the Vds pin and that no short
circuit exist between Vout and Vds (no A/K short ? circuit).
Such a command over ride the BKL1 and BKL2 status and
the check is carried out even when the BKL1 & BKL2 bits
are low. In case of failure, the chip de ? activate the offender
pin and returns the fault bit into the register. The MCU can
read the STATUS register content by means of the I2C
protocol.
continuous current is limited to 100 mA maximum per LED.
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