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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
Parameter
Min.
Typ.
Max.
Units
Conditions
Thermal Shutdown Hysteresis
SDA, SCL Input Logic Low
Voltage
SDA, SCL Input Logic High
Voltage
1.6
15
0.4
°C
V
V
?
?
Regulator turns on
SDA, SCL Timeout for Shutdown
90
150
ms
I 2 C S PECIFICATION
S
XRP7620
Address
R/ W
A
Status
Data
A
LED1 Data
A
LED2 Data
A
LED3 Data
A
LED4 Data
A
SP
7-bit
1/0
8-bit
8-bit
8-bit
8-bit
8-bit
Start Condition
Acknowledgement
sent by the slave
I 2 C T IMING C HARACTERISTICS
Acknowledgement
- sent by the slave when R/ W =0
- sent by master when R/ W =1
Fig. 2: Data Input Format
Stop Condition
Unless otherwise indicated, V IN = 2.7V to 4.6V, C IN = 1μF, T A = – 40°C
to 85°C, T J = – 40°C to 100°C.
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 parameters tested at T A =25 °C. Specifications over temperature are guaranteed by design.
Note 2: LED current matching is calculated by this equation:
I LED ? I AVG
I AVG
? 100 % Where I AVG is the average current of 4 channels.
? 2012 Exar Corporation
3/11
Rev. 1.1.0
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