|
|
PDF LTC4316 Data sheet ( Hoja de datos )
| Número de pieza | LTC4316 | |
| Descripción | Single I2C/SMBus Address Translator | |
| Fabricantes | Linear | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LTC4316 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
|
No Preview Available !
LTC4316
Single I2C/SMBus
Address Translator
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 Compatible with SMBus, I2C and I2C Fast Mode
n Pass-Through Mode Allows General Call Addressing
n ±4kV HBM ESD Ruggedness
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
n Support Bus Hot Swap™
n 10-Lead MSOP and DFN 3mm × 3mm Packages
Applications
n I2C, SMBus Address Expansion
n Address Translation
n Servers
n Telecom
Description
The LTC®4316 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 LTC4316 incorporates a pass-through mode which
disables the address translation and allows general call
addressing by the master. The LTC4316 is designed to
automatically recover from abnormal bus conditions like
bus stuck low or premature STOP bits.
PART NUMBER
LTC4316
LTC4317
LTC4318
NUMBER OF INPUT
CHANNELS
1
1
2
NUMBER OF OUTPUT
CHANNELS
1
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
SENDS
ADDRESS 0x34
SCL
MASTER
SDA
TRANSLATES BY 0x02
VCC
SCLIN SCLOUT
LTC4316
SDAIN SDAOUT
3.3V ENABLE READY
XORL XORH GND
976k
3.3V
182k
5V
RECEIVES
ADDRESS 0x36
SCL
START
BIT
ADDRESS BITS
R/W ACK
BIT BIT
a6 a5 a4 a3 a2 a1 a0
SCLIN
SLAVE
SDA
SDAIN
TRANSLATION
BYTE
0 0 1 1 0 1 0 0 = 0x34
0 0 0 0 0 0 1 0 = 0x02
SDAOUT
0 0 1 1 0 1 1 0 = 0x36
4316 TA01b
4316 TA01a
For more information www.linear.com/LTC4316
4316f
1
1 page  
LTC4316
Typical Performance Characteristics TA = 25°C, VCC = 3.3V unless otherwise noted.
SDAOUT Fall Delay vs Bus
Capacitance
300
275
250 VCC = 5V
225 VCC = 3.3V
200
175
VCC = 2.25V
150
125
100
0
200 400 600 800 1000
CBUS (pF)
4316 G07
SDAOUT Fall Time vs
Temperature
120 C = 100pF
100
VIN = 5V
80
VIN = 3.3V
60
40 VIN = 2.25V
20
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
4316 G08
SDAOUT Fall Time vs Bus
Capacitance
120
100 VIN = 5V
80
VIN = 3.3V
60
40 VIN = 2.25V
20
0
200 400 600 800 1000
CBUS (pF)
4316 G09
Pin Functions
XORL: Translator XOR Lower Nibble Configuration Input.
The DC voltage at this pin configures the lower 4-bit nibble
of the address translation byte. Tie the pin to an external
resistive divider connected between VCC and GND to set
the desired DC voltage.
XORH: Translator XOR Upper Nibble Configuration Input.
The DC voltage at this pin configures the upper 3-bit nibble
of the address translation byte. Tie the pin to an external
resistive divider connected between VCC and GND to set
the desired DC voltage. Connect this pin to VCC to activate
pass-through mode. See Application Information section
for more details.
ENABLE: Enable Input. If ENABLE pin is low, the address
translation is disabled, SDAIN is disconnected from SD-
AOUT, and SCLIN is disconnected from SCLOUT. A low
to high transition on ENABLE restarts the configuration of
the address translation byte and also enables the address
translation. Connect to VCC if unused.
Exposed Pad (DFN Package Only): Exposed pad may be
left open or connected to device GND.
GND: Device Ground.
READY: Ready Status Output. This is an open drain output
to indicate that the device is ready for address translation.
The pin releases high when the LTC4316 has completed
configuration of the address translation byte, SDAIN is
connected to SDAOUT and SCLIN is connected to SCLOUT.
Connect a pull-up resistor, typically 10k, from this pin to
the bus pull-up supply. Leave open or tie to GND if unused.
SCLIN: Input Bus Clock Input and Output. Connect this
pin to the SCL line on the master side. An external pull-up
resistor or current source is required.
SCLOUT: Output Bus Clock Input and Output. Connect this
pin to the SCL line on the slave side. An external pull-up
resistor or current source is required.
SDAIN: Input Bus Data Input and Output. Connect this pin
to the SDA line on the master side. An external pull-up
resistor or current source is required.
SDAOUT: Output Bus Data Input and Output. Connect this
pin to the SDA line on the slave side. An external pull-up
resistor or current source is required.
VCC: Power Supply Input (2.25V to 5.5V). If the supply
voltages for the input and output buses are different, con-
nect this pin to the lower supply. If the input and output
supplies have the same nominal value and with tolerance
less than or equal to ±10%, connect VCC to either supply.
Bypass with at least 0.1μF to GND.
For more information www.linear.com/LTC4316
4316f
5
5 Page 
LTC4316
Operation
it may convert START bits to STOP bits and vice versa,
causing unexpected slave behavior.
If an START bit is received during the address byte when
the active translating bit is a 1, the slave device will see
a STOP bit. This will typically reset the slave and cause it
to miss the remainder of the transmission. If the START
bit is received while the active translating bit is a 0, the
START passes through the LTC4316 unchanged. The slave
will react in the same way it would if the LTC4316 was
not present, and will typically reset when the master next
issues a STOP bit. In both cases, the LTC4316 automati-
cally resets at the next STOP bit and the next message
will be transmitted normally.
If an STOP bit is received during the address byte, the
LTC4316 will abort the address translation and ensure
that a STOP bit is issued at SDAOUT to reset the slave. If
the active translating bit is a 0 when the STOP arrives, it is
not modified, and the slave will see the STOP and typically
reset. If the active translating bit is a 1 when the STOP
arrives, the slave device will see a START bit. This might
leave the slave in an indeterminate state, so the LTC4316
briefly disconnects the slave from the master, adds a short
delay, and then generates a STOP bit at the SDAOUT pin
(Figure 9). It then reconnects the busses and waits for a
START bit to begin the next transmission. Again, in both
cases, the LTC4316 automatically resets and the next
message will be transmitted normally.
Stuck Bus Timeout
During the address translation, if SCLIN stays low or high
for more than 30ms without any transitions, the LTC4316
will abort the address translation and reconnect SDAIN to
SDAOUT. It will then wait for a START bit to start a new
address translation. This prevents any bus stuck low/
high conditions from permanently disconnecting SDAIN
from SDAOUT.
Supported Protocols
The LTC4316 is designed to support most I2C and SMBus
message protocols. The only exceptions are protocols that
use pre-assigned addresses on the slave side of the bus.
Supported I2C and SMBus Protocols
• Send/Receive Byte
• Write Byte/Word
• Read Byte/Word
• Process Call
• Block Write/Read
• Block Write-Block Read Process Call
• Extended Read and Write Commands
• General Call (I2C only)
• Start Byte (I2C only)
ADDRESS BIT
BECOMES
STOP BIT
• PMBus (without PEC)
Unsupported I2C Protocols
SCLIN
SDAIN
STOP
BIT
START
BIT
• 10-Bit Addressing
• Device ID
TRANSLATION BYTE 1
SDAOUT
START
BIT
STOP
BIT
START
BIT
N2 GATE
N1 GATE
N2 OFF
N2 OFF
N1 ON
N2 ON
N1
OFF
N1 ON
4316 F09
Figure 9. Stop Bit within Address Byte when
Address Translation Byte Is 1
• Ultra Fast-Mode I2C Bus Protocol
Unsupported SMBus Protocols
• SMBus Host Notify
• Address Resolution Protocol (ARP)
• Parity Error Code (PEC)
• Alert Response Address (ARA)
• PMBus (with PEC)
For more information www.linear.com/LTC4316
4316f
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LTC4316.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LTC4310-1 | Hot-Swappable I2C Isolators |  Linear Technology |
| LTC4310-2 | Hot-Swappable I2C Isolators | Linear Technology |
| LTC4311 | Low Voltage I2C/SMBus Accelerator | Linear |
| LTC4315 | 2-Wire Bus Buffer | Linear |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |