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X R P 6 8 4 0
4 . 3 A S u p e r c a p a c i t o r F l a s h L E D D r i v e r w i t h I 2 C
represent the DAC codes D2, D1, D0. They are
used to set the flash LED current levels in each
channel. Table 5 provides the DAC codes and
the corresponding nominal current levels for
each channel:
Addressing and Writing Data
To write data to the XRP6840 one of the
following two sequences is required:
Easy shutdown/startup sequence
D2-D0
Code
XRP6840A
I OUT /Ch. (mA)
D2-D0
Code
XRP6840B
I OUT /Ch. (mA)
[Slave Address with write bit][Data for Status]
0
0
0
0
1
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
0
400
586
770
948
1197
1291
0
0
0
0
1
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
0
597
875
1127
1400
1671
1910
Full shutdown/startup sequence
[Slave Address with write bit][Data for Status]
[Data for LEDFLASH][Data for LEDTORCH]
Slave address is ‘28’ Hex.
1
1
1 1445 1 1 1 2150
Table 5: Nominal Flash Mode Output Current
Addressing and Reading Data
LEDTORCH Register
LEDTORCH register bits B2 to B7, also
summarized in Table 1; they correspond to
LED1, LED2 and LED3. Bits B4, B3, B2, and
B1 represent the DAC codes D3, D2, D1, D0.
They are used to set the torch LED current
levels in each channel. Table 6 provides the
DAC codes and their corresponding nominal
current levels for each channel. Remember
that the total current that can be supported in
torch mode is 600mA divided by the gain of
the charge pump. If 2 channels are set to
440mA (a total of 880mA), even with a gain of
1X, the input current limit will clamp the total
current to approximately 600mA.
To read data from the XRP6840 the following
sequence is required:
[Slave Address with read bit][Data for Status]
[Data for LEDFLASH][Data for LEDTORCH]
D3-D0
Code
XRP6840A
I OUT /Ch. (mA)
D3-D0
Code
XRP6840B
I OUT /Ch. (mA)
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
23
46
66
86
105
125
145
165
185
205
225
245
260
280
300
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
34
66
97
127
155
185
215
245
275
305
330
360
385
415
440
Table 6: Torch Mode Output Current
? 2009 Exar Corporation
11/17
Rev. 1.0.0
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