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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
Parameter
Min.
Typ.
Max.
Units
Conditions
Channel to Channel Current
Matching
-3
3
%
?
0mA < I LED < 1.6A Per Channel, Note 3
Switching Frequency
Equivalent Resistance, 1X Mode
2.0
2.4
0.5
2.8
MHz
?
?
?
V IN = 3.7V, I OUT = 200mA
Equivalent Resistance, 1.5X
Mode
LEDx Pin Dropout Voltage
LEDx Pin Dropout Voltage
4
7
0.36
0.1
?
V
V
?
?
?
V IN = 3.2V, V OUT < V OUT_LIMIT ,
I OUT = 200mA, Equivalent resistance =
[(V IN x 1.5) - V OUT ] / I OUT
Flash mode, V IN = 3.4V, I LED = 1A,
Measure LED current at 95% I LEDX-NOMINAL
at V LEDX =0.8V
Torch mode, V IN = 3.4V, I LED = 80mA,
Measure LED current at 95% I LEDX-NOMINAL
at V LEDX =0.8V
LED Short Detect Threshold
0.1
0.2
0.4
V
?
V OUT – V LED , LED = 0mA for all DAC code
Thermal Regulation
0.01
%/ o C
C
C
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
150
10
o
o
Driver turn OFF
Driver turn ON
Output Voltage Regulation (OVR)
5.2
5.3
5.4
V
?
Flash Mode, I LED = 0mA, V OUT Rising
STATUS2 Register: [B7 B6 B5] = 101
OVR value is set by STATUS2 register
between 4.55V – 5.6V, all setting have
+/- 100mV tolerance
Output Voltage Regulation
Hysteresis
RDY Pin Output Trip Threshold
RDY Pin Sink Current
SDA, SCL, RESET_N, FLASH
Input Logic Low Voltage
SDA, SCL, RESET_N, FLASH
Input Logic High Voltage
1
1.6
50
V O – 0.1
0.4
mV
V
mA
V
V
?
?
?
Flash Mode, I LED = 0mA
STATUS2 Register: [B7 B6 B5] = 101
100mV below actual OVR value.
Turn-Off Time (T OFF ) Into
Shutdown
50
μs
RDY goes low when RESET_N goes from
high top low
0.09
0.11
0.13
s
?
STATUS1 register [B1 B0]=00
Flash Time Duration Before
Standby
0.18
0.43
0.9
0.22
0.53
1.1
0.26
0.63
1.3
s
s
s
?
?
?
STATUS1 register [B1 B0]=01
STATUS1 register [B1 B0]=10
STATUS1 register [B1 B0]=11
I 2 C SPECIFICATIONS
I 2 C A DDRESSING F ORMAT
S
XRP6840
Address
R/ W
A
Status
Data
A
LED1 Data
A
LED2 Data
A
LED3 Data
A
SP
7-bit
1/0
8-bit
8-bit
8-bit
8-bit
Start Condition
Acknowledgement
Stop Condition
Acknowledgement
sent by the slave
- sent by the slave when R/ W =0
- sent by master when R/ W =1
Fig. 2: I 2 C Data Input Format
? 2009 Exar Corporation
3/17
Rev. 1.0.0
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