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X R P 6 8 4 0
4 . 3 A S u p e r c a p a c i t o r F l a s h L E D D r i v e r w i t h I 2 C
Default I 2 C slave 7-bit address for XRP6840 is 0101000b
I 2 C T IMING C HARACTERISTICS
V IN = 3.3V, T A = –40°C to 85°C, T J = –40°C to 125°C. Unless otherwise noted.
Parameter
Symbol
Min.
Typ.
Max.
Units
Conditions
Serial Clock Frequency
Bus Free Time between a STOP
and a START
Hold Time, Repeated START
Condition
STOP Condition Setup Time
f SCL
t BUF
t HD_STA
t SU,STO
1.3
0.6
0.6
400
KHz
μs
μs
ms
Data Hold Time
Input Data Hold Time
Data Setup Time
SCL Clock Low Period
SCL Clock High Period
t HD,DAT(OUT)
t HD,DAT(IN)
t SU,DAT
t LOW
t HIGH
225
0
100
1.3
0.6
900
900
ns
ns
ns
ms
ms
Rise Time of Both SDA and SCL
Signals, receiving
Fall Time of Both SDA and SCL
Signals, Receiving
Fall Time of SDA Transmitting
Pulse Width of Spike Suppressed
Capacitive Load for each Bus
Line
I 2 C Startup Time after UVLO
clears
t R
t F
t F.TX
t SP
Cb
t SRT
20 +
0.1Cb
20 +
0.1Cb
20 +
0.1Cb
0
300
300
250
50
400
1
ns
ns
ns
ns
pF
μs
Note 4,5
Note 4,5
Note 4,5,6
Note 7
Note 4
Note 4
Note 1: All parameter tested at T A = 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 I AVG is the average current of all channels.
Note
Note
Note
Note
4:
5:
6:
7:
Guaranteed by design.
Cb = total capacitance of one bus line in pF. tR and tF measured between 0.3 x V DD and 0.7 x V DD .
I SINK ≤ 6mA. Cb =total capacitance of one bus line in pF. t R and t F measured between 0.3 x V DD and 0.7 V DD .
Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.
? 2009 Exar Corporation
4/17
Rev. 1.0.0
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