SI9135 Datasheet, PDF (9/14 Pages) Vishay Siliconix – SMBus Multi-Output Power-Supply Controller

New Product
Si9135
Vishay Siliconix
SMBUS Specification
SMBus: The System Management Bus is a two-wire interface
through which simple power related chips can communicate
with the rest of the system. It uses I²C as its backbone. Both
SDA and SCL are bidirectional lines, connected to a positive
voltage via a pull-up resistor. When the bus is free, both lines
are high. The output stages of devices connected to the bus
must have an open drain or open collector in order to perform
the wired AND function. Data on the SMBus can be
transferred at a clock rate up to 100 kHz. Si9135 is a slave
with SMBus address of 0110000.
SMBUS TRUTH TABLE
State
D7
D6
D5
D4
D3
D2
D1
D0
Shutdown
Buck3 On
Buck5 On
Flyback On
Buck3, Buck5 On
Buck3, Flyback On
Buck5, Flyback on
All On
0
0
0
X
X
X
X
X
1
0
0
X
X
X
X
X
0
1
0
X
X
X
X
X
0
0
1
X
X
X
X
X
1
1
0
X
X
X
X
X
1
0
1
X
X
X
X
X
0
1
1
X
X
X
X
X
1
1
1
X
X
X
X
X
Notes
a. Positive logic level is used
b. X: don’t care
SMBUS ELECTRICAL SPECIFICATION (Test Conditions: V+ = 5.5 to 30 V, T_A = O°C)
Symbol
Parameter
Min
Max
Units
V_IL
V_IH
V_OL
I_LEAK
Data, Clock Input Low Voltage
Data, Clock Input High Voltage
Data, Clock Output Low Voltage
Input Leakage
-0.5
0.6
1.4
5.5
V
0.4
±1
µA
SMBUS AC SPECIFICATIONS
Symbol
Parameter
F_SMB
T_BUF
T_HD
T_SU
T_LOW
T_HIGH
T_F
T_R
SMBus Operation Frequency
Bus free time between Stop and Start
Data Hold Time
Data Setup Time
Clock Low Period
Clock High Period
Clock/Data Fall Time
Clock/Data Rise Time
Min
Max
Units
10
100
kHz
4.7
µs
300
ns
250
4.7
µs
4.0
50
300
ns
1000
FaxBack 408-970-5600, request 70817
www.siliconix.com
S-60752—Rev. B, 05-Apr-99
9