LTM2887 datasheet(10/38 Pages) LINER

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LTM2887

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For more information www.linear.com/LTM2887

PIN FUNCTIONS

LTM2887-I Logic Side

DO2(A1):DigitalOutput,ReferencedtoVLandGND.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 connected internally.

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

GND. Logic input connected to isolated side SCL2 pin

throughisolationbarrier.Clockisunidirectionalfromlogic

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, Referenced to VL and GND. Enables

power and data communication 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

1.62V to 5.5V. Internally bypassed with 1µF.

DO1(B1):DigitalOutput,ReferencedtoVLandGND.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 LTM2887-3 and 4.5V to 5.5V for LTM2887-5.

Internally bypassed with 2.2µF.

LTM2887-I Isolated Side

I2 (L1): Digital Input, Referenced to VL2 and GND2. Logic

inputconnectedtoDO2throughisolationbarrier.Thelogic

state on I2 translates to the same logic state on DO2. Do

not float.

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

SCL2 (L3): Serial I2C Clock Output, Referenced to VL2 and

GND2.LogicoutputconnectedtologicsideSCLpinthrough

isolationbarrier.Clockisunidirectionalfromlogictoisolated

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 VL2 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 VL2 and GND2.

Logic output connected to DI1 through isolation barrier.

Under the condition of an isolation communication failure

O1 defaults to a high state.

VL2 (L6): 3V to 5.5V Adjustable Isolated Supply Voltage.

Internally generated from VCC by an isolated DC/DC con-

verter and regulated to 5V with no external components.

Internally bypassed with 4.7µF.

IVCC2 (L7): VCC2 precision current limit adjust pin. Current

limit threshold is set by connecting a resistor between

IVCC2 and GND2. For detailed information on how to set

the current limit resistor value, see the Application Infor-

mation section. If not used, tie IVCC2 to GND2. Internally

bypassed with 10nF.

VCC2 (L8): 0.6V to 5.5V Adjustable Isolated Supply Volt-

age. Internally generated from VCC by an isolated DC/DC

converterandregulatedto5Vwithnoexternalcomponents.

Internally bypassed with 4.7µF.

I1 (K1): Digital Input, Referenced to VL2 and GND2. Logic

inputconnectedtoDO1throughisolationbarrier.Thelogic

state on I1 translates to the same logic state on DO1. Do

not float.

GND2 (K2 to K5): Isolated Ground.

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