XRP6840 Exar Corporation, XRP6840 Datasheet - Page 3

• Manufacturer Part Number: XRP6840
• Description: 4.3a Supercapacitor Flash Led Driver With I2c
• Manufacturer: Exar Corporation

I
I
© 2009 Exar Corporation
Channel to Channel Current
Matching
Switching Frequency
Equivalent Resistance, 1X Mode
Equivalent Resistance, 1.5X
Mode
LEDx Pin Dropout Voltage
LEDx Pin Dropout Voltage
LED Short Detect Threshold
Thermal Regulation
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Output Voltage Regulation (OVR)
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
Turn-Off Time (T
Shutdown
Flash Time Duration Before
Standby
2
2
S
C SPECIFICATIONS
C A
Start Condition
DDRESSING
XRP6840
Parameter
Address
7-bit
Acknowledgement
sent by the slave
OFF
) Into
F
ORMAT
R/W
1/0
A
Min.
0.09
0.18
0.43
2.0
0.1
5.2
1.6
0.9
-3
1
Status
Data
8-bit
V
O
Fig. 2: I
Typ.
4
0.11
0.22
0.53
4
150
2.4
0.5
0.2
5.3
1.1
10
50
– 0.1
4
.
.
3
3
A
A
A
Acknowledgement
- sent by the slave when R/ W =0
- sent by master when R/ W =1
2
C Data Input Format
S
S
Max.
0.36
0.01
0.13
0.26
0.63
u
LED1 Data
u
2.8
0.1
0.4
5.4
0.4
1.3
3/17
3
7
p
p
8-bit
e
e
r
r
c
c
a
a
Units
%/
MHz
mV
mA
p
p
50
%
o
o
Ω
Ω
V
V
V
V
V
V
V
s
s
s
s
C
C
o
a
a
C
A
c
c
i
i
t
t
o
o
µs
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
LED2 Data
r
r
8-bit
0mA < I
V
V
[(V
Flash mode, V
Measure LED current at 95% I
at V
Torch mode, V
Measure LED current at 95% I
at V
V
Driver turn OFF
Driver turn ON
Flash Mode, I
STATUS2 Register: [B7 B6 B5] = 101
OVR value is set by STATUS2 register
between 4.55V – 5.6V, all setting have
+/- 100mV tolerance
Flash Mode, I
STATUS2 Register: [B7 B6 B5] = 101
100mV below actual OVR value.
RDY goes low when RESET_N goes from
high top low
STATUS1 register [B1 B0]=00
STATUS1 register [B1 B0]=01
STATUS1 register [B1 B0]=10
STATUS1 register [B1 B0]=11
F
F
I
IN
IN
OUT
OUT
l
l
a
IN
a
= 3.7V, I
= 3.2V, V
LEDX
LEDX
– V
= 200mA, Equivalent resistance =
x 1.5) - V
s
s
h
h
=0.8V
=0.8V
LED
LED
L
L
, LED = 0mA for all DAC code
< 1.6A Per Channel, Note 3
A
E
E
OUT
OUT
LED
LED
D
D
IN
IN
OUT
Conditions
= 200mA
= 3.4V, I
< V
= 0mA, V
= 0mA
= 3.4V, I
] / I
D
D
LED3 Data
r
r
OUT_LIMIT
8-bit
i
OUT
i
v
v
e
e
Stop Condition
X
X
LED
LED
OUT
r
r
,
R
R
= 1A,
w
w
= 80mA,
Rising
P
P
LEDX-NOMINAL
LEDX-NOMINAL
Rev. 1.0.0
i
i
6
6
t
A
t
h
h
8
8
I
I
4
4
SP
2
2
0
0
C
C