Datasheet LTC4331 (Analog Devices) - 8
| Manufacturer | Analog Devices |
| Description | I2C Slave Device Extender Over Rugged Differential Link |
| Pages / Page | 26 / 8 — Logic (All Logic Side Inputs and Outputs Referenced. to GND and VL Except … |
| File Format / Size | PDF / 243 Kb |
| Document Language | English |
Logic (All Logic Side Inputs and Outputs Referenced. to GND and VL Except SLO, which Is Referenced to. GND and VCC)
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LTC4331 PIN FUNCTIONS
Logic (All Logic Side Inputs and Outputs Referenced
function for the local side’s I2C control interface when
to GND and VL Except SLO, which Is Referenced to
enabled. The ALERT pin switches to a level-sensitive active
GND and VCC)
low interrupt signal when register field INTR_MODE = 1.
V
Connect to an external pull-up on the local side. Do not
CC (Pin 1):
Supply Voltage. 3V < VCC < 5.5V. Bypass with 4.7μF ceramic capacitor to GND. allow the ALERT pin to float on the remote side.
V A1 (Pin 11):
I2C Device Address Select 1. A1 is a 3-state
L (Pin 2):
Logic Supply Voltage. 1.62V < VL < 5.5V. Bypass with 1μF ceramic capacitor to GND. input. A1 in conjunction with A2 selects one of eight pos- sible I2C addresses assigned to the internal slave device.
ON (Pin 3):
Enable Input. Set high for operation. Set low Float pins A1 and A2 to disable the internal I2C device. Set for low power mode, in which the internal reset is held to high, low, or float as defined in Table 4. and outputs are disabled. Connect to VL if unused.
A2 (Pin 12):
I2C Device Address Select 2. A2 is a 3-State
REMOTE (Pin 4):
Operating Mode Select Input. Set low input. A2 in conjunction with A1 selects one of eight pos- for local I2C slave mode. Set high for I2C master mode sible I2C addresses assigned to the internal slave device. when used on the remote side. REMOTE is weakly pulled Float pins A1 and A2 to disable the internal I2C device. Set to GND. to high, low, or float as defined in Table 4.
LINK (Pin 5):
Link Status Open-Drain Output. When in
CTRL (Pin 13):
Local to Remote Control. Values set on the remote mode, LINK is driven low when the device estab- local side CTRL pin propagate to the remote side CTRL pin lishes link communication. When in local mode, LINK is over the differential link. On the remote side, CTRL is not driven low after the LTC4331’s I2C interface has joined the driven at startup until the differential link is established. I2C bus in addition to establishing link communication. CTRL has a weak pull-up to VL and can be unconnected The link status function is only valid when an LTC4331 if not used. configured to local mode (REMOTE set low) connects to a second LTC4331 configured to remote mode (REMOTE
SPEED1 (Pin 14):
Link and Interface Timing Select 1. set high). Connect to an external pull-up to V SPEED1 is a 3-state input and in conjunction with SPEED2 L to monitor status, otherwise float or connect to GND. selects link baud rate and I2C bus timing. Set to high, low, or float as defined in Table 2.
RDY (Pin 6):
I2C Ready Status Open-Drain Output. RDY is driven low after the device’s I2C interface has joined the
SPEED2 (Pin 15):
Link and Interface Timing Select 2. bus. Use to detect when the LTC4331’s control interface SPEED2 is a 3-state input and in conjunction with SPEED1 is available in the absence of a connected link. RDY has selects link baud rate and I2C bus timing. Set to high, low, a weak internal pull-up to V or float as defined in Table 2. L and is only valid when in local mode. In remote mode the pin can be unconnected.
GND (Pin 16):
Ground.
SCL (Pin 7):
I2C Serial Clock. Low side output driver and
SLO (Pin 17):
Link Slow Mode Input. Set low to limit the input. Connect to an external pull-up. link transmitter slew rate which also limits the maximum
SDA (Pin 8):
I2C Serial Data. Low side output driver and link rate set by SPEED1 and SPEED2. Only valid for SPEED input. Connect to an external pull-up. INDEX 0 and 1. SLO is referenced to GND and VCC. Do not allow pin SLO to float.
NC (Pins 9, 20):
Unconnected Pins. Float or connect to GND.
Link ALERT (Pin 10):
SMBALERT/Interrupt. ALERT is an open-
A (Pin 18):
Noninverting Link Transceiver Pin. drain output in local mode and an input in remote mode.
B (Pin 19):
Inverting Link Transceiver Pin. Values set on the remote side ALERT propagate to the local side ALERT pin. In addition, ALERT is the SMBALERT Rev 0 8 For more information www.analog.com Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Switching Characteristics Typical Performance Characteristics Pin Functions Block Diagram Test Circuits Timing Diagrams Applications Information Typical Applications Package Description Typical Application Related Parts
Logic (All Logic Side Inputs and Outputs Referenced
function for the local side’s I2C control interface when
to GND and VL Except SLO, which Is Referenced to
enabled. The ALERT pin switches to a level-sensitive active
GND and VCC)
low interrupt signal when register field INTR_MODE = 1.
V
Connect to an external pull-up on the local side. Do not
CC (Pin 1):
Supply Voltage. 3V < VCC < 5.5V. Bypass with 4.7μF ceramic capacitor to GND. allow the ALERT pin to float on the remote side.
V A1 (Pin 11):
I2C Device Address Select 1. A1 is a 3-state
L (Pin 2):
Logic Supply Voltage. 1.62V < VL < 5.5V. Bypass with 1μF ceramic capacitor to GND. input. A1 in conjunction with A2 selects one of eight pos- sible I2C addresses assigned to the internal slave device.
ON (Pin 3):
Enable Input. Set high for operation. Set low Float pins A1 and A2 to disable the internal I2C device. Set for low power mode, in which the internal reset is held to high, low, or float as defined in Table 4. and outputs are disabled. Connect to VL if unused.
A2 (Pin 12):
I2C Device Address Select 2. A2 is a 3-State
REMOTE (Pin 4):
Operating Mode Select Input. Set low input. A2 in conjunction with A1 selects one of eight pos- for local I2C slave mode. Set high for I2C master mode sible I2C addresses assigned to the internal slave device. when used on the remote side. REMOTE is weakly pulled Float pins A1 and A2 to disable the internal I2C device. Set to GND. to high, low, or float as defined in Table 4.
LINK (Pin 5):
Link Status Open-Drain Output. When in
CTRL (Pin 13):
Local to Remote Control. Values set on the remote mode, LINK is driven low when the device estab- local side CTRL pin propagate to the remote side CTRL pin lishes link communication. When in local mode, LINK is over the differential link. On the remote side, CTRL is not driven low after the LTC4331’s I2C interface has joined the driven at startup until the differential link is established. I2C bus in addition to establishing link communication. CTRL has a weak pull-up to VL and can be unconnected The link status function is only valid when an LTC4331 if not used. configured to local mode (REMOTE set low) connects to a second LTC4331 configured to remote mode (REMOTE
SPEED1 (Pin 14):
Link and Interface Timing Select 1. set high). Connect to an external pull-up to V SPEED1 is a 3-state input and in conjunction with SPEED2 L to monitor status, otherwise float or connect to GND. selects link baud rate and I2C bus timing. Set to high, low, or float as defined in Table 2.
RDY (Pin 6):
I2C Ready Status Open-Drain Output. RDY is driven low after the device’s I2C interface has joined the
SPEED2 (Pin 15):
Link and Interface Timing Select 2. bus. Use to detect when the LTC4331’s control interface SPEED2 is a 3-state input and in conjunction with SPEED1 is available in the absence of a connected link. RDY has selects link baud rate and I2C bus timing. Set to high, low, a weak internal pull-up to V or float as defined in Table 2. L and is only valid when in local mode. In remote mode the pin can be unconnected.
GND (Pin 16):
Ground.
SCL (Pin 7):
I2C Serial Clock. Low side output driver and
SLO (Pin 17):
Link Slow Mode Input. Set low to limit the input. Connect to an external pull-up. link transmitter slew rate which also limits the maximum
SDA (Pin 8):
I2C Serial Data. Low side output driver and link rate set by SPEED1 and SPEED2. Only valid for SPEED input. Connect to an external pull-up. INDEX 0 and 1. SLO is referenced to GND and VCC. Do not allow pin SLO to float.
NC (Pins 9, 20):
Unconnected Pins. Float or connect to GND.
Link ALERT (Pin 10):
SMBALERT/Interrupt. ALERT is an open-
A (Pin 18):
Noninverting Link Transceiver Pin. drain output in local mode and an input in remote mode.
B (Pin 19):
Inverting Link Transceiver Pin. Values set on the remote side ALERT propagate to the local side ALERT pin. In addition, ALERT is the SMBALERT Rev 0 8 For more information www.analog.com Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Switching Characteristics Typical Performance Characteristics Pin Functions Block Diagram Test Circuits Timing Diagrams Applications Information Typical Applications Package Description Typical Application Related Parts
