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XRP7620EVB Datasheet(PDF) 3 Page - Exar Corporation

Part No. XRP7620EVB
Description  4-Channel Adjustable Current I2C Controlled LED Driver
Download  11 Pages
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRP7620EVB Datasheet(HTML) 3 Page - Exar Corporation

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20
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© 2009 Exar Corporation
3/11
Rev. 1.0.0
Parameter
Min.
Typ.
Max.
Units
Conditions
Thermal Shutdown Hysteresis
15
°C
Regulator turns on
SDA, SCL Input Logic Low
Voltage
0.4
V
SDA, SCL Input Logic High
Voltage
1.6
V
SDA, SCL Timeout for Shutdown
90
150
ms
I2C SPECIFICATION
XRP7620
Address
R/W
Status
Data
LED1 Data
LED2 Data
LED3 Data
LED4 Data
S
7-bit
1/0
A
8-bit
A
8-bit
A
8-bit
A
8-bit
A
8-bit
A
SP
Fig. 2: Data Input Format
I2C TIMING CHARACTERISTICS
Unless otherwise indicated, VIN = 2.7V to 4.6V, CIN = 1µF, TA= –40°C to 85°C, TJ = –40°C to 100°C.
Parameter
Symbol
Min.
Typ.
Max.
Units
Conditions
Serial Clock Frequency
fSCL
400
KHz
Bus Free Time between a STOP
and a START
tBUF
1.3
µs
Hold Time, Repeated START
Condition
tHD_STA
0.6
µs
STOP Condition Setup Time
tSU,STO
0.6
ms
Data Hold Time
tHD,DAT(OUT)
225
900
ns
Input Data Hold Time
tHD, DAT(IN)
0
900
ns
Data Setup Time
tSU, DAT
100
ns
SCL Clock Low Period
tLOW
1.3
ms
SCL Clock High Period
tHIGH
0.6
ms
Rise Time of Both SDA and SCL
Signals, receiving
tR
20+0.1Cb
300
ns
Note 4,5
Fall Time of Both SDA and SCL
Signals, Receiving
tF
20+0.1Cb
300
ns
Note 4,5
Fall Time of SDA Transmitting
tF.TX
20+0.1Cb
250
ns
Note 4,5, 6
Pulse Width of Spike Suppressed
tSP
0
50
ns
Note 7
Capacitive Load for each Bus Line
Cb
400
pF
Note 4
I2C Startup Time after UVLO
clears
tSRT
1
µs
Note 4
Note 1: All parameters tested at TA=25 °C. Specifications over temperature are guaranteed by design.
Note 2: LED current matching is calculated by this equation:
%
100
×
AVG
AVG
LED
I
I
I
Where IAVG is the average current of 4 channels.
Start Condition
Acknowledgement
sent by the slave
Acknowledgement
- sent by the slave when R/W=0
- sent by master when R/W=1
Stop Condition


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