XRP6840 Exar Corporation, XRP6840 Datasheet - Page 6

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

PIN DESCRIPTION
ORDERING INFORMATION
“YY” = Year – “WW” = Work Week – “X” = Lot Number
© 2009 Exar Corporation
XRP6840AILB-F
XRP6840AILBTR-F
XRP6840BILB-F
XRP6840BILBTR-F
XRP6840EVB
LED
LED
Thermal Pad
Part Number
(XRP6840A)
(XRP6840B)
SCL, SDA
RESET_N
1
, LED
1
C
C
Name
FLASH
, NC, LED
2P
GND
1P
C
RDY
P
CAP
V
NC
V
GND
, C
GND
OUT
, C
IN
2
2N
2P
, LED
2
3
Pin Number
XRP6840 Evaluation Board – XRP6840A based.
-40°C≤T
-40°C≤T
-40°C≤T
-40°C≤T
Temperature
7, 8, 9
7, 8, 9
16, 17
18, 19
5, 11
3, 4
10
12
13
14
15
20
Junction
1
2
6
-
Range
A
A
A
A
≤+125°C
≤+125°C
≤+125°C
≤+125°C
Charge pump ground pin.
Active high push-pull output. RDY is high when V
V
B6 B5]. The V
The SDA and SCL pins connect to the I
through his interface. They can also be used for read-back.
Power ground pin. The Source of internal NMOS is connected to this pin.
Active Low input pin.
If RESET_N = 0, then XRP6840 is in Shut-down mode
If RESET_N = 0 and STATUS1 register [B5] = 0, then reset all registers to logic low.
If RESET_N = 0 and STATUS1 register [B5] = 1, then all bits of all registers will be
saved.
LED
for LED current. These current sources are controlled by LEDFLASH or LEDTORCH
registers which is programmed through I
the LEDs. LED
current. If a pin is not used connect it to V
protection circuit which shut-down LED current if LED voltage approaches to V
Digital Input pin. Active high. If STATUS1 register [B7 B6] = 11 and FLASH = 1 then
LEDs are ON for one Flash timeout duration. Flash Timeout duration is controlled by
STATUS1 register [B1 B0].
No connection. This pin can be connected to P
Ground pin. This ground pin doesn’t carry high internal current.
This pin is the output of an internal Op-Amp. This internal Op-Amp is powered by V
The output voltage is half of V
current is limited by 470Ω output resistance. This provides active balancing between
two internal sections of the super capacitor.
Output voltage. Connect positive terminal of SuperCap here. Connect the LEDs
between this pin and the corresponding internal current source. Decouple with 10µF
ceramic capacitor close to the pins of the IC.
Connect C
Connect C
Connect thermal pad to P
Power supply input. Decouple with 10µF ceramic capacitor close to the pins of the IC.
OUT_LIMIT
1
, LED
Marking
YYWWX
YYWWX
YYWWX
YYWWX
6840AI
6840AI
6840BI
6840BI
voltage. The V
2
2
1
, LED
4
external flying capacitor between these pins.
external flying capacitor between these pins.
4
.
.
OUT_LIMIT
1
, LED
3
3
3
A
A
connect to the drain of the internal NMOS which are current sources
20-pin TQFN
20-pin TQFN
20-pin TQFN
20-pin TQFN
2
S
S
, LED
Package
for Torch mode is 4.50V.
u
u
OUT_LIMIT
6/17
p
p
GND
3
e
e
pins can be connected together to provide higher LED
r
r
pins.
c
OUT
c
for Flash mode is determined by STATUS2 register [B7
a
a
, and output resistance is 470Ω. The sink and source
p
p
3K/Tape & Reel
3K/Tape & Reel
a
a
Quantity
Description
c
c
Packing
2
C bus. Multiple functions can be programmed
i
i
Bulk
Bulk
t
t
2
C to provide the Torch and Flash current for
o
o
OUT
r
r
. The XRP6840 incorporates a short LED
GND
F
F
l
l
OUT
a
pin for heat sink.
a
s
s
reached to 100mV below its
RoHS Compliant/
RoHS Compliant/
RoHS Compliant/
RoHS Compliant/
h
h
Halogen Free
Halogen Free
Halogen Free
Halogen Free
L
L
Note 1
E
E
D
D
D
D
r
r
i
i
v
v
e
e
X
X
r
r
R
R
3 Channels
3 Channels
2 Channels
2 Channels
w
w
Note 2
P
P
Rev. 1.0.0
i
i
OUT_LIMIT
6
6
t
t
h
h
8
8
OUT
I
I
4
4
2
.
2
.
0
0
C
C