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XRP6840BILBTR-F Datasheet(PDF) 10 Page - Exar Corporation

Part # XRP6840BILBTR-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

XRP6840BILBTR-F Datasheet(HTML) 10 Page - Exar Corporation

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© 2009 Exar Corporation
10/17
Rev. 1.0.0
APPLICATION INFORMATION
I2C SERIAL INTERFACE
REGISTERS
The XRP6840 has five serially programmable
data registers via the I²C interface. These
registers can be reset to ‘0’ through power on
reset or setting RESET_N, pin 6, to ‘0’. The
first register is for Device Address as shown in
Figure 3; it is activated by ‘28’ HEX (7-bit
format).
The
second
register,
STATUS1,
contains the control word for programming
operating modes, shutdown control, charge
pump modes and flash timeout. The third
register, STATUS2, contains the flash voltage
level, read back of the Flash Ready, and fault
conditions UVLO and over temperature. The
fourth register, LEDFLASH, controls individual
LED channels and current level in Flash Mode.
The
fifth
register,
LEDTORCH,
controls
individual LED channels and current level in
Torch Mode.
Register
B7
B6 B5 B4 B3 B2
B1
B0
Address
0
1
0
1
0
0
0
R/W
STATUS1
Flash
Torch
Mode
Flash
Torch
Mode
Shut
Down
Control
Gain
Gain
-
Flash
Timeout
Flash
Timeout
STATUS2
Flash
V
Flash
V
Flash
V
Flash
Ready
UVLO
Fault
Temp
Fault
0
0
LEDFLASH
LED1
LED2
LED3*
D2
D1
D0
-
-
LEDTORCH
LED1
LED2
LED3*
D3
D2
D1
D0
-
Table 1: XRP6840 I2C Registers Bit Map
* Not used for XRP6840B
STATUS1 Register
STATUS1 Register Bits B7, B6, B4 and B3
B7
B6
B4
B3
Operation Mode
0
1
0
0
High Efficiency Torch Mode
0
1
0
1
1X Torch Mode
0
1
1
0
1.5X Torch Mode
0
1
1
1
2X Torch Mode
1
0
0
0
Auto Gain Torch Mode
1
0
0
1
1X Torch Mode
1
0
1
0
1.5X Torch Mode
1
0
1
1
2X Torch Mode
1
1
0
0
Auto Gain Flash Mode
1
1
0
1
1X Flash Mode
1
1
1
0
1.5X Flash Mode
1
1
1
1
2X Flash Mode
Table 2: STATUS1 Register Operation Modes
STATUS1 Register Bit B5
This bit is used to save or reset the contents
of
STATUS1,
STATUS2,
LEDFLASH
and
LEDTORCH registers for the next I2C command
when RESET_N, pin 6, is ‘1’. If B5 is ‘1’ then
all bits in these registers will be saved.
Otherwise if B5 is ‘0’ then all bits will be reset
to ‘0’.
STATUS1 Register Bits B1 and B0
These two bits program the flash timeout
duration as follows:
B1
B0
Flash Duration
0
0
0.11s
0
1
0.22s
1
0
0.53s
1
1
1.10s
Table 3: Charge Pump Mode Selection
STATUS2 Register
Flash Mode Voltage Programming
VOUT_LIMIT in Flash Mode is regulated with 50mV
of hysteresis and is programmed through bits
B7, B6 and B5 of STATUS2 register as follows:
B7
B6
B5
Comment
0
0
0
4.55V
0
0
1
4.70V
0
1
0
4.85V
0
1
1
5.00V
1
0
0
5.15V
1
0
1
5.30V
1
1
0
5.45V
1
1
1
5.60V
Table 4: Flash Mode VOUT_LIMIT Settings
Bit B4
RDY bit is available for I2C read-back. This bit
is set to ‘1’ when VOUT > VOUT_LIMIT, and set to
‘0’ otherwise.
Fault mode read-back bits B3, B2
These bits are designed for 2 Fault Mode flags
and are also available for I2C read-back. Bits
3 and 2 are set to ‘1’ when UVLO and over
temperature
conditions
are
detected,
as
shown in Table 1.
LEDFLASH Register
LEDFLASH register, bits B7, B6 and B5 are
used to activate the LED outputs channels as
summarized in Table 1; they correspond to
LED1, LED2 and LED3.
Bits B4, B3 and B2


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