LTM2882V-5 View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTM2882V-5

Dual Isolated RS232 µModule Transceiver + Power

Linear Technology 

LTM2882

Pin Functions

LOGIC SIDE

R2OUT (Pin A1): Channel 2 RS232 Inverting Receiver

Output. Controlled through isolation barrier from receiver

input R2IN. Under the condition of an isolation communi-

cation failure R2OUT is in a high impedance state.

T2IN (Pin A2): Channel 2 RS232 Inverting Driver Input.

A logic low on this input generates a high on isolated

output T2OUT. A logic high on this input generates a low

on isolated output T2OUT. Do not float.

R1OUT (Pin A3): Channel 1 RS232 Inverting Receiver

Output. Controlled through isolation barrier from receiver

input R1IN. Under the condition of an isolation communi-

cation failure R1OUT is in a high impedance state.

T1IN (Pin A4): Channel 1 RS232 Inverting Driver Input.

A logic low on this input generates a high on isolated

output T1OUT. A logic high on this input generates a low

on isolated output T1OUT. Do not float.

DIN (Pin A5): General Purpose Non-Inverting Logic Input.

A logic high on DIN generates a logic high on isolated

output DOUT. A logic low on DIN generates a logic low

on isolated output DOUT. Do not float.

ON (Pin A6): Enable. Enables power and data communica-

tion through the isolation barrier. If ON is high the part is

enabled and power and communications are functional to

the isolated side. If ON is low the logic side is held in reset

and the isolated side is unpowered. Do not float.

VL (Pin A7): Logic Supply. Interface supply voltage for pins

DIN, R2OUT, T2IN, R1OUT, T1IN, and ON. Operating voltage

is 1.62V to 5.5V. Internally bypassed to GND with 2.2µF.

VCC (Pins A8, B7-B8): Supply Voltage. Operating volt-

age is 3.0V to 3.6V for LTM2882-3, and 4.5V to 5.5V for

LTM2882-5. Internally bypassed to GND with 2.2µF.

GND (Pins B1-B6): Circuit Ground.

ISOLATED SIDE

GND2 (Pins K1-K7): Isolated Side Circuit Ground. These

pads should be connected to the isolated ground and/or

cable shield.

VCC2 (Pins K8, L7-L8): Isolated Supply Voltage Output. In-

ternally generated from VCC by an isolated DC/DC converter

and regulated to 5V. Supply voltage for pins R1IN, R2IN,

DE, and DOUT. Internally bypassed to GND2 with 2.2µF.

R2IN (Pin L1): Channel 2 RS232 Inverting Receiver Input.

A low on isolated input R2IN generates a logic high on

R2OUT. A high on isolated input R2IN generates a logic

low on R2OUT. Impedance is nominally 5kΩ in receive

mode or unpowered.

T2OUT (Pin L2): Channel 2 RS232 Inverting Driver

Output. Controlled through isolation barrier from driver

input T2IN. High impedance when the driver is disabled

(DE pin is low).

R1IN (Pin L3): Channel 1 RS232 Inverting Receiver Input.

A low on isolated input R1IN generates a logic high on

R1OUT. A high on isolated input R1IN generates a logic

low on R1OUT. Impedance is nominally 5kΩ in receive

mode or unpowered.

T1OUT (Pin L4): Channel 1 RS232 Inverting Driver

Output. Controlled through isolation barrier from driver

input T1IN. High impedance when the driver is disabled

(DE pin is low).

DOUT (Pin L5): General Purpose Non-Inverting Logic

Output. Logic output connected through isolation barrier

to DIN.

DE (Pin L6): Driver Output Enable. A low input forces

both RS232 driver outputs, T1OUT and T2OUT, into a high

impedance state. A high input enables both RS232 driver

outputs. Do not float.

2882ff

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For more information www.linear.com/LTM2882

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