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X R P 7 6 2 0
4 - C h a n n e l A d j u s t a b l e C u r r e n t I 2 C C o n t r o l l e d L E D D r i v e r
USING THE EVALUATION BOARD
P OWERING U P THE XRP7620 C IRCUIT
1. Connect VIN from VIN to GND
(V IN range 2.7V to 5.5V).
2. Apply I2C connections of SDA, SCL and
GND to J1.
3. Use I2C serial connection and software to
control LED1 to LED4.
To measure current through LED1 to LED4,
remove zero ohm resistors at R1 to R4 and
add SM 0603 1 Ohm resistors to R1 to R4.
Then measure current with DVM across R1 to
R4.
Note: 1mV across R1 equals 1mA of current through D1
LED.
EVALUATION BOARD LAYOUT
Fig. 3: XRP7620 Evalution Board Layout
Component Side
BILL OF MATERIAL
LED C URRENT P ROGRAMMING
The XRP7620 provides I 2 C serial interface
independently control each LED up to a
current of 31.5mA in steps of 500μA. Please
refer to the application information section of
the data sheet to program specific current for
each LED channel.
For typical test result please refer to the data
sheet.
Fig. 4: XRP7620 Evalution Board Layout
Solder Side
Ref.
Board
U1
C1
R1,R2,R3,R4
Qty
1
1
1
4
Manufacturer
Exar Corp.
Exar Corp.
muRata
Vishay
Part Number
146-6663-01
XRP7620IH-F
GRM188R60J105K
CRCW06030000Z0EA
Size
2"x1.5"
DFN-8L
0603
0603
Component
XRP7620EVB Eval board
4 Channel I2C Controlled
LED driver
Ceramic 1uF, 6.3V, X5R
0 Ohm Resistor, 1/10W
Vendor
Exar Corp.
Exar Corp.
muRata.com
Vishay.com
J1
1
Wurth Electronic
61304011021
0.23"x0.12" 4-Pin Right Angle Header
we-
online.com
TP
6
Mill-Max
0300-115-01-4727100
.042" dia
Test Point Female Pin
digikey.com
Table 1: XRP7620 Evaluation Board Bill of Material
? 2009 Exar Corporation
3/4
Rev. 1.0.0
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