LTC4305CDHD datasheet(6/20 Pages) LINER

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LTC4305

4305f

ALERT1–ALERT2 (Pins 14, 1): Fault Alert Inputs,

Channels 1–2. Devices on each of the two output channels

can pull their respective pin low to indicate that a fault has

occurred. The LTC4305 then pulls the ALERT low to pass

the fault indication on to the host. See the “Operation”

section below for the details of how ALERT is set and

cleared. Connect unused fault alert inputs to VCC.

ALERT (Pin 2): Fault Alert Output. An open-drain output

that is pulled low when a fault occurs to alert the host

controller. The LTC4305 pulls ALERT low when any of the

ALERT1–ALERT2 pins is low; when the two-wire bus is

stuck low; or when the Connection Requirement bit of

downstream channel that is low. See the “Operation”

section below for the details of how ALERT is set and

cleared. The LTC4305 is compatible with the SMBus Alert

Response Address protocol. Connect a 10k resistor to a

power supply voltage to provide the pull-up. Tie to ground

if unused.

SDAIN (Pin 3): Serial 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.

GND (Pin 4): Device Ground.

SCLIN (Pin 5): Serial Bus Clock Input. Connect this pin to

the SCL line on the master side. An external pull-up

resistor or current source is required.

ENABLE (Pin 6): Digital Interface Enable and Register

Reset. Driving ENABLE high enables I2C communication

to the LTC4305. Driving ENABLE low disables I2C com-

munication to the LTC4305 and resets the registers to

their default state as shown in the Operations section.

When ENABLE returns high, masters can read and write

the LTC4305 again. If unused, tie ENABLE to VCC.

VCC (Pin 7): Power Supply Voltage. Connect a bypass

capacitor of at least 0.01

µF directly between VCC and GND

for best results.

ADR0–ADR2 (Pins 8–10): Three-State Serial Bus

Address Inputs. Each pin may be floated, tied to ground,

or tied to VCC. There are therefore 27 possible addresses.

See Table 1 in Applications Information section. When the

pins are floated, they can tolerate

±5µA of leakage current

and still convert the address correctly.

READY (Pin 11): Connection Ready Digital Output. An

N-channel MOSFET open-drain output transistor that pulls

down when none of the downstream channels is con-

nected to the upstream bus and turns off when one or

more downstream channels is connected to the upstream

bus. Connect a 10k resistor to a power supply voltage to

provide the pull-up. Tie to ground if unused.

SCL1–SCL2 (Pins 12, 16): Serial Bus Clock Outputs

Channels 1–2. Connect pins SCL1–SCL2 to the SCL lines

on the downstream channels 1–2, respectively. It is ac-

ceptable to float any pin that will never be connected to the

upstream bus. Otherwise, an external pull-up resistor or

current source is required on each pin.

SDA1–SDA2 (Pins 13, 15): Serial Bus Data Output

Channels 1–2. Connect pins SDA1–SDA2 to the SDA lines on

downstream channels 1–2, respectively. It is acceptable

to float any pin that will never be connected to the

upstream bus. Otherwise, an external pull-up resistor or

current source is required on each pin.

Exposed Pad (Pin 17, DHD Package Only): Exposed pad

may be left open or connected to device ground.

PI FU CTIO S

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