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XRP6840 Datasheet(PDF) 4 Page - Exar Corporation

Part # XRP6840
Description  4.3A Supercapacitor Flash LED Driver with I2C
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRP6840 Datasheet(HTML) 4 Page - Exar Corporation

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© 2009 Exar Corporation
4/17
Rev. 1.0.0
Default I2C slave 7-bit address for XRP6840 is 0101000b
I2C TIMING CHARACTERISTICS
VIN = 3.3V, TA = –40°C to 85°C, TJ = –40°C to 125°C. Unless otherwise noted.
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 parameter tested at TA = 25°C. Specifications over temperature are guaranteed by design.
Note 2: Current into all LED pins is up to 400mA continuously in Torch 1.5x mode.
Note 3: LED current matching is calculated by this equation:
100% where IAVG is the average current of all channels.
Note 4: Guaranteed by design.
Note 5: Cb = total capacitance of one bus line in pF. tR and tF measured between 0.3 x VDD and 0.7 x VDD.
Note 6: ISINK ≤6mA. Cb =total capacitance of one bus line in pF. tR and tF measured between 0.3 x VDD and 0.7 VDD.
Note 7: Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.


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