LTC4318_15 Datasheet, PDF (1/14 Pages) Linear Technology – Dual I2C/SMBus Address Translator

LTC4318
Dual I²C/SMBus
Address Translator
Features
nn _{Allows Multiple Slaves with the Same Address to}
Coexist on the Same Bus
nn _{Resistor Configurable Address Translation}
nn _{No Software Programming Required}
nn _{Compatible with SMBus, I}²_{C and I}²_{C Fast Mode}
nn _{Pass-Through Mode Allows General Call Addressing}
nn _{±4kV HBM ESD Ruggedness}
nn _{Level Translation for 2.5V, 3.3V and 5V Buses}
nn _{Stuck Bus Timeout}
nn _{Prevents SDA and SCL Corruption During Live Board}
Insertion and Removal
nn _{Support Bus Hot Swap™}
nn _{20-Lead QFN 4mm × 4mm Package}
Applications
nn _I²_{C, SMBus Address Expansion}
nn _{Address Translation}
nn _Servers
nn _Telecom
Description
The LTC^®4318 enables the hardwired address of one or
more I²C or SMBus slave devices to be translated to a
different address. This allows slaves with the same hard-
wired address to coexist on the same bus. Only discrete
resistors are needed to select the new address and no
software programming is required. Up to 127 different
address translations are available.
The LTC4318 incorporates a pass-through mode which
disables the address translations and allows general call
addressing by the master. The LTC4318 is designed to
automatically recover from abnormal bus conditions like
bus stuck low or premature STOP bits.
PART NUMBER
NUMBER OF INPUT NUMBER OF OUTPUT
CHANNELS
CHANNELS
LTC4316
1
1
LTC4317
1
2
LTC4318
2
2
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot
Swap is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Protected by U.S. Patents, including 6356140, 6650174, 7032051,
7478286. Patent pending.
Typical Application
3.3V
SCL
MASTER #1
SDA
SENDS
ADDRESS 0x34
3.3V
SCL
MASTER #1
SDA
SENDS
ADDRESS 0x32
V_CC
SCLIN1 SCLOUT1
TRANSLATES
BY 0x02
SDAIN1 SDAOUT1
LTC4318
ENABLE1 READY1
ENABLE2 READY2
TRANSLATES
BY 0x04
SCLIN2 SCLOUT2
SDAIN2 SDAOUT2
XORH2
GND
XORH1
XORL2 XORL1
3.3V
845k 61.9k 93.1k
4318 TA01a
5V
SCL
SLAVE# 1
SDA
RECEIVES
ADDRESS 0X36
5V
SCL
SLAVE# 2
SDA
RECEIVES
ADDRESS 0X36
START
ADDRESS BITS
R/W ACK
BIT BIT
a6
a5
a4
a3
a2
a1
a0
SCLIN1
SDAIN1
TRANSLATION
BYTE
SDAOUT1
0
0
1
1
0
1
0
0 = 0x34
0
0
0
0
0
0
1
0 = 0x02
0
0
1
1
0
1
1
0 = 0x36
4318 TA01b
4318f
For more information www.linear.com/LTC4318
1