LTM2882
9
2882fd
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.
V
L
(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.
V
CC
(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.
V
CC2
(Pins K8, L7-L8): Isolated Supply Voltage Output. In-
ternally generated from V
CC
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.
pin FuncTions
