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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
APPLICATION INFORMATION
I 2 C S ERIAL I NTERFACE
R EGISTERS
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
STATUS1 Register Bit B5
This bit is used to save or reset the contents
of STATUS1, STATUS2, LEDFLASH and
LEDTORCH registers for the next I 2 C 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
V OUT_LIMIT in Flash Mode is regulated with 50mV
of hysteresis and is programmed through bits
B7, B6 and B5 of STATUS2 register as follows:
Address
STATUS1
0
Flash
Torch
Mode
1 0
Flash Shut
Torch Down
Mode Control
1
Gain
0
Gain
0
-
0 R/W
Flash Flash
Timeout Timeout
B7
0
B6
0
B5
0
Comment
4.55V
STATUS2
LEDFLASH
LEDTORCH
Flash
V
LED1
LED1
Flash
V
LED2
LED2
Flash
V
LED3*
LED3*
Flash
Ready
D2
D3
UVLO
Fault
D1
D2
Temp
Fault
D0
D1
0
-
D0
0
-
-
0
0
0
1
0
1
1
0
1
0
1
0
4.70V
4.85V
5.00V
5.15V
Table 1: XRP6840 I 2 C Registers Bit Map
* Not used for XRP6840B
1
1
1
0
1
1
1
0
1
5.30V
5.45V
5.60V
STATUS1 Register
STATUS1 Register Bits B7, B6, B4 and B3
Table 4: Flash Mode V OUT_LIMIT Settings
Bit B4
RDY bit is available for I 2 C read-back. This bit
B7
0
0
0
0
1
1
1
1
1
1
1
1
B6
1
1
1
1
0
0
0
0
1
1
1
1
B4
0
0
1
1
0
0
1
1
0
0
1
1
B3
0
1
0
1
0
1
0
1
0
1
0
1
Operation Mode
High Efficiency Torch Mode
1X Torch Mode
1.5X Torch Mode
2X Torch Mode
Auto Gain Torch Mode
1X Torch Mode
1.5X Torch Mode
2X Torch Mode
Auto Gain Flash Mode
1X Flash Mode
1.5X Flash Mode
2X Flash Mode
is set to ‘1’ when V OUT > V OUT_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 I 2 C 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
Table 2: STATUS1 Register Operation Modes
summarized in Table 1; they correspond to
LED 1 , LED 2 and LED 3 . Bits B4, B3 and B2
? 2009 Exar Corporation
10/17
Rev. 1.0.0
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