XRP6840 Datasheet, PDF (4/17 Pages) Exar Corporation – 4.3A Supercapacitor Flash LED Driver with I2C

XRP6840
4.3A Supercapacitor Flash LED Driver with I²C
Default I²C slave 7-bit address for XRP6840 is 0101000b
I²C TIMING CHARACTERISTICS
V_IN = 3.3V, T_A = –40°C to 85°C, T_J = –40°C to 125°C. Unless otherwise noted.
Parameter
Serial Clock Frequency
Bus Free Time between a STOP
and a START
Hold Time, Repeated START
Condition
STOP Condition Setup Time
Data Hold Time
Input Data Hold Time
Data Setup Time
SCL Clock Low Period
SCL Clock High Period
Rise Time of Both SDA and SCL
Signals, receiving
Fall Time of Both SDA and SCL
Signals, Receiving
Symbol
f_SCL
t_BUF
t_{HD_STA}
t_SU,STO
t_HD,DAT(OUT)
t_HD,DAT(IN)
t_SU,DAT
t_LOW
t_HIGH
t_R
t_F
Fall Time of SDA Transmitting
t_F.TX
Pulse Width of Spike Suppressed
t_SP
Capacitive Load for each Bus
Line
Cb
I²C Startup Time after UVLO
clears
t_SRT
Min.
1.3
0.6
0.6
225
0
100
1.3
0.6
20 +
0.1Cb
20 +
0.1Cb
20 +
0.1Cb
0
Typ.
Max.
400
900
900
300
300
250
50
400
1
Units
KHz
µs
Conditions
µs
ms
ns
ns
ns
ms
ms
ns Note 4,5
ns Note 4,5
ns Note 4,5,6
ns Note 7
pF Note 4
µs 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 4: Guaranteed by design.
Note 5: 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.
Note 6: 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.
Note 7: Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.
© 2009 Exar Corporation
4/17
Rev. 1.0.0