The LTC4316/LTC4317/LTC4318 are I2C/SMBus address translators that bridge two or more segments of an I2C bus, reading
incoming addresses on the master side and transmitting a different 7-bit I2C address to the slave side to avoid address conflicts.
Only discrete resistors are needed to select the new address and no software programming is required. Up to 127 different
address translations are available
.
Features
n
Allows Multiple Slaves with the Same
Address to Coexist on the Same Bus
n
Resistor Configurable Address
Translation
n
No Software Programming Required
n
SMBus, I2C and I2C Fast Mode
Compatible
n
Pass-Through Mode Allows General Call
Addressing
n
±4kV HBM ESD
n
Level Translation for 2.5V, 3.3V and 5V
Buses
n
Stuck Bus Timeout
n
Prevents SDA and SCL Corruption
During Live Board Insertion and
Removal
I2C/SMBus Address Translators
Part Number
Number of
Input Channels
Number of
Output Channels Packages
LTC4316 1 1 3mm × 3mm DFN-10, MSOP-10
LTC4317 1 2 5mm × 3mm DFN-16
LTC4318 2 2 4mm × 4mm QFN-20
TRANSLATION
BYTE
SDAOUT
SCLIN
SDAIN
ADDRESS BITS
START
BIT
a6 a5 a4 a3 a2 a1 a0
0 1 1 0 1 0 0 = 0x34
0 0 0 0 0 1 0 = 0x02
0
0
0
0 1 1 0 1 1 0 = 0x36
R/W
BIT
ACK
BIT
Timing Diagram Example
Part Selection
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog Devices, Inc.
All other trademarks are the property of their respective owners.
Configurations
Part Comparison
SCL
SDA
MASTER
SCLOUT
SDAOUT
SCLIN
SDAIN
SLAVE #1
INPUT ADDRESS 0x32
TRANSLATION BYTE 0x06
SCL
SDA
SLAVE
#1
HARDWIRED ADDRESS
0x34
LTC4316
#1
SCLOUT
SDAOUT
SCLIN
SDAIN
SLAVE #3
INPUT ADDRESS 0x36
TRANSLATION BYTE 0x02
SCL
SDA
SLAVE
#3
HARDWIRED ADDRESS
0x34
LTC4316
#2
SCL
SDA
SLAVE
#2
HARDWIRED ADDRESS
0x34
00110010
00000110
00110100
00110110
00000010
00110100
SCL
SDA
MASTER
SCL
SDA
SLAVE
#2
HARDWIRED ADDRESS
0x34
SCLOUT
SDAOUT
SCLIN
SDAIN
TRANSLATION BYTE
0x02
SLAVE #1
INPUT ADDRESS
0x36
SLAVE #3
INPUT ADDRESS
0x32
SCL
SDA
SLAVE
#1
HARDWIRED ADDRESS
0x34
LTC4316
SCL
SDA
SLAVE
#3
HARDWIRED ADDRESS
0x30
00110110
00000010
00110100
00110010
00000010
00110000
SCLOUT
SDAOUT
READY
SCLOUT
SDAOUT
READY
VCC
SCLIN
SDAIN
XORH
XORL
ENABLE
GND
SCLIN
SDAIN
XORH
XORL
ENABLE
SINGLE
LTC4316
SCLOUT1
SDAOUT1
READY1
SCLOUT
SDAOUT
READY
VCC
SCLIN
SDAIN
XORH1
XORL1
ENABLE1
SCLIN
SDAIN
XORH
XORL
ENABLE
Y CONNECTED DUAL
LTC4317
SCLOUT2
SDAOUT2
READY2
SCLOUT
SDAOUT
READY
SCLIN
SDAIN
XORH
XORL
ENABLE
CHANNEL2
CHANNEL1
SCLOUT1
SDAOUT1
READY1
SCLOUT
SDAOUT
READY
VCC
SCLIN1
SDAIN1
XORH1
XORL1
ENABLE1
SCLIN
SDAIN
XORH
XORL
ENABLE
DUAL
LTC4318
SCLOUT2
SDAOUT2
READY2
SCLOUT
SDAOUT
READY
SCLIN2
SDAIN2
XORH2
XORL2
ENABLE2
GND
SCLIN
SDAIN
XORH
XORL
ENABLE
CHANNEL2
CHANNEL1
XORH2
XORL2
ENABLE2
GND
Two Independent Address Translations Two Slaves Sharing One LTC4316
0315A
www.linear.com/4316 n 1-800-4-LINEAR
