LTM2883 View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTM2883

SPI/Digital or I2C µModule Isolator with Adjustable ±12.5V and 5V Regulated Power

Linear Technology 

LTM2883

Pin Functions (LTM2883-I)

Logic Side

DO2 (A1): Digital Output, Referenced to VL and GND. Logic

output connected to I2 through isolation barrier. Under

the condition of an isolation communication failure this

output is in a high impedance state.

DNC (A2): Do Not Connect Pin. Pin connected internally.

SCL (A3): Serial I2C Clock Input, Referenced to VL and

GND. Logic input connected to isolated side SCL2 pin

through isolation barrier. Clock is unidirectional from logic

to isolated side. Do not float.

SDA (A4): Serial I2C Data Pin, Referenced to VL and GND.

Bidirectional logic pin connected to isolated side SDA2 pin

through isolation barrier. Under the condition of an isola-

tion communication failure this pin is in a high impedance

state. Do not float.

DI1 (A5): Digital Input, Referenced to VL and GND. Logic

input connected to O1 through isolation barrier. The logic

state on DI1 translates to the same logic state on O1. Do

not float.

GND (A6, B2 to B6): Circuit Ground.

ON (A7): 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, all digital outputs are in a high impedance state, and

the isolated side is unpowered. Do not float.

VL (A8): Logic Supply. Interface supply voltage for pins

DI1, SCL, SDA, DO1, DO2, and ON. Operating voltage is

3V to 5.5V. Internally bypassed with 2.2µF.

DO1 (B1): Digital Output, Referenced to VL and GND. Logic

output connected to I1 through isolation barrier. Under

the condition of an isolation communication failure this

output is in a high impedance state.

VCC (B7 to B8): Supply Voltage. Operating voltage is 3V

to 3.6V for LTM2883-3 and 4.5V to 5.5V for LTM2883-5.

Internally bypassed with 2.2µF.

Isolated Side

I2 (L1): Digital Input, Referenced to VCC2 and GND2.

Logic input connected to DO2 through isolation barrier.

12

The logic state on I2 translates to the same logic state on

DO2. Do not float.

DNC (L2): Do Not Connect Pin. Pin connected internally.

SCL2 (L3): Serial I2C Clock Output, Referenced to VCC2

and GND2. Logic output connected to logic side SCL pin

through isolation barrier. Clock is unidirectional from logic

to isolated side. SCL2 has a push-pull output stage, do not

connect an external pull-up device. Under the condition of

an isolation communication failure this output defaults to

a high state.

SDA2 (L4): Serial I2C Data Pin, Referenced to VCC2 and

GND2. Bidirectional logic pin connected to logic side SDA

pin through isolation barrier. Output is biased high by a

1.8mA current source. Do not connect an external pull-

up device to SDA2. Under the condition of an isolation

communication failure this output defaults to a high state.

O1 (L5): Digital Output, Referenced to VCC2 and GND2.

Logic output connected to DI1 through isolation barrier.

Under the condition of an isolation communication failure

O1 defaults to a high state.

VCC2 (L6): 5V Nominal Isolated Supply Voltage. Internally

generated from VCC by an isolated DC/DC converter and

regulated to 5V. Internally bypassed with 2.2µF.

V– (L7): –12.5V Nominal Isolated Supply Voltage. Internally

generated from VCC by an isolated DC/DC converter and

regulated to –12.5V. Internally bypassed with 1µF.

V+ (L8): 12.5V Nominal Isolated Supply Voltage. Internally

generated from VCC by an isolated DC/DC converter and

regulated to 12.5V. Internally bypassed with 1µF.

I1 (K1): Digital Input, Referenced to VCC2 and GND2.

Logic input connected to DO1 through isolation barrier.

The logic state on I1 translates to the same logic state on

DO1. Do not float.

GND2 (K2 to K5): Isolated Ground.

AVCC2 (K6): 5V Nominal Isolated Supply Voltage Adjust.

The adjust pin voltage is 600mV referenced to GND2.

AV– (K7): –12.5V Nominal Isolated Supply Voltage Adjust.

The adjust pin voltage is –1.22V referenced to GND2.

AV+ (K8): 12.5V Nominal Isolated Supply Voltage Adjust.

The adjust pin voltage is 1.22V referenced to GND2.

2883f

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