LTC4331 datasheet(8/26 Pages) AD

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LTC4331

Rev 0

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PIN FUNCTIONS

Logic (All Logic Side Inputs and Outputs Referenced

to GND and VL Except SLO, which Is Referenced to

GND and VCC)

VCC (Pin 1): Supply Voltage. 3V < VCC < 5.5V. Bypass with

4.7F ceramic capacitor to GND.

VL (Pin 2): Logic Supply Voltage. 1.62V < VL < 5.5V.

Bypass with 1F ceramic capacitor to GND.

ON (Pin 3): Enable Input. Set high for operation. Set low

for low power mode, in which the internal reset is held

and outputs are disabled. Connect to VL if unused.

REMOTE (Pin 4): Operating Mode Select Input. Set low

for local I2C slave mode. Set high for I2C master mode

when used on the remote side. REMOTE is weakly pulled

to GND.

LINK (Pin 5): Link Status Open-Drain Output. When in

remote mode, LINK is driven low when the device estab-

lishes link communication. When in local mode, LINK is

driven low after the LTC4331’s I2C interface has joined the

I2C bus in addition to establishing link communication.

The link status function is only valid when an LTC4331

configured to local mode (REMOTE set low) connects to

a second LTC4331 configured to remote mode (REMOTE

set high). Connect to an external pull-up to VL to monitor

status, otherwise float or connect to GND.

RDY (Pin 6): I2C Ready Status Open-Drain Output. RDY

is driven low after the device’s I2C interface has joined the

bus. Use to detect when the LTC4331’s control interface

is available in the absence of a connected link. RDY has

a weak internal pull-up to VL and is only valid when in

local mode. In remote mode the pin can be unconnected.

SCL (Pin 7): I2C Serial Clock. Low side output driver and

input. Connect to an external pull-up.

SDA (Pin 8): I2C Serial Data. Low side output driver and

input. Connect to an external pull-up.

NC (Pins 9, 20): Unconnected Pins. Float or connect to

GND.

ALERT (Pin 10): SMBALERT/Interrupt. ALERT is an open-

drain output in local mode and an input in remote mode.

Values set on the remote side ALERT propagate to the

local side ALERT pin. In addition, ALERT is the SMBALERT

function for the local side’s I2C control interface when

enabled. The ALERT pin switches to a level-sensitive active

low interrupt signal when register field INTR_MODE = 1.

Connect to an external pull-up on the local side. Do not

allow the ALERT pin to float on the remote side.

A1 (Pin 11): I2C Device Address Select 1. A1 is a 3-state

input. A1 in conjunction with A2 selects one of eight pos-

sible I2C addresses assigned to the internal slave device.

Float pins A1 and A2 to disable the internal I2C device. Set

to high, low, or float as defined in Table4.

A2 (Pin 12): I2C Device Address Select 2. A2 is a 3-State

input. A2 in conjunction with A1 selects one of eight pos-

sible I2C addresses assigned to the internal slave device.

Float pins A1 and A2 to disable the internal I2C device. Set

to high, low, or float as defined in Table4.

CTRL (Pin 13): Local to Remote Control. Values set on the

local side CTRL pin propagate to the remote side CTRL pin

over the differential link. On the remote side, CTRL is not

driven at startup until the differential link is established.

CTRL has a weak pull-up to VL and can be unconnected

if not used.

SPEED1 (Pin 14): Link and Interface Timing Select 1.

SPEED1 is a 3-state input and in conjunction with SPEED2

selects link baud rate and I2C bus timing. Set to high, low,

or float as defined in Table2.

SPEED2 (Pin 15): Link and Interface Timing Select 2.

SPEED2 is a 3-state input and in conjunction with SPEED1

selects link baud rate and I2C bus timing. Set to high, low,

or float as defined in Table2.

GND (Pin 16): Ground.

SLO (Pin 17): Link Slow Mode Input. Set low to limit the

link transmitter slew rate which also limits the maximum

link rate set by SPEED1 and SPEED2. Only valid for SPEED

INDEX 0 and 1. SLO is referenced to GND and VCC. Do not

allow pin SLO to float.

Link

A (Pin 18): Noninverting Link Transceiver Pin.

B (Pin 19): Inverting Link Transceiver Pin.

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