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XRP6840AILB-F Datasheet(PDF) 11 Page - Exar Corporation

Part # XRP6840AILB-F
Description  4.3A Supercapacitor Flash LED Driver with I2C
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRP6840AILB-F Datasheet(HTML) 11 Page - Exar Corporation

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© 2009 Exar Corporation
11/17
Rev. 1.0.0
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:
D2-D0
Code
XRP6840A
IOUT/Ch. (mA)
D2-D0
Code
XRP6840B
IOUT/Ch. (mA)
0 0 0
0
0 0 0
0
0 0 1
400
0 0 1
597
0 1 0
586
0 1 0
875
0 1 1
770
0 1 1
1127
1 0 0
948
1 0 0
1400
1 0 1
1197
1 0 1
1671
1 1 0
1291
1 1 0
1910
1 1 1
1445
1 1 1
2150
Table 5: Nominal Flash Mode Output Current
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.
D3-D0
Code
XRP6840A
IOUT/Ch. (mA)
D3-D0
Code
XRP6840B
IOUT/Ch. (mA)
0 0 0 0
0
0 0 0 0
0
0 0 0 1
23
0 0 0 1
34
0 0 1 0
46
0 0 1 0
66
0 0 1 1
66
0 0 1 1
97
0 1 0 0
86
0 1 0 0
127
0 1 0 1
105
0 1 0 1
155
0 1 1 0
125
0 1 1 0
185
0 1 1 1
145
0 1 1 1
215
1 0 0 0
165
1 0 0 0
245
1 0 0 1
185
1 0 0 1
275
1 0 1 0
205
1 0 1 0
305
1 0 1 1
225
1 0 1 1
330
1 1 0 0
245
1 1 0 0
360
1 1 0 1
260
1 1 0 1
385
1 1 1 0
280
1 1 1 0
415
1 1 1 1
300
1 1 1 1
440
Table 6: Torch Mode Output Current
Addressing and Writing Data
To write data to the XRP6840 one of the
following two sequences is required:
Easy shutdown/startup sequence
[Slave Address with write bit][Data for Status]
Full shutdown/startup sequence
[Slave Address with write bit][Data for Status]
[Data for LEDFLASH][Data for LEDTORCH]
Slave address is ‘28’ Hex.
Addressing and Reading Data
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]


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