LTM2886 datasheet(13/38 Pages) LINER

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LTM2886

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For more information www.linear.com/LTM2886

PIN FUNCTIONS

Logic Side

SDO (A1): Serial SPI Digital Output, Referenced to VL

and GND. Logic output connected to isolated side SDO2

pin through isolation barrier. Under the condition of an

isolation communication failure this output is in a high

impedance state.

DO2(A2):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.

SCK (A3): Serial SPI Clock Input, Referenced to VL and

GND. Logic input connected to isolated side SCK2 pin

through isolation barrier. Do not float.

SDI(A4):SerialSPIDataInput,ReferencedtoVLandGND.

Logic input connected to isolated side SDI2 pin through

isolation barrier. Do not float.

CS(A5):SerialSPIChipSelect,ReferencedtoVLandGND.

Logic input connected to isolated side CS2 pin through

isolation barrier. Do not float.

SDOE (A6): Serial SPI Data Output Enable, Referenced to

VL and GND. A logic high on SDOE places the logic side

SDO pin in a high impedance state, a logic low enables

the output. Do not float.

ON(A7):Enable,ReferencedtoVLandGND.Enablespower

anddatacommunicationthroughtheisolationbarrier.IfON

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

SDI, SCK, SDO, SDOE, DO1, DO2, CS, 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.

GND (B2 to B6): Circuit Ground.

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

to 3.6V for LTM2886-3 and 4.5V to 5.5V for LTM2886-5.

Internally bypassed with 2.2µF.

Isolated Side

SDO2 (L1): Serial SPI Digital Input, Referenced to VCC2

and GND2. Logic input connected to logic side SDO pin

through isolation barrier. Do not float.

I2 (L2): Digital Input, Referenced to VCC2 and GND2.

Logic input connected to DO2 through isolation barrier.

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

DO2. Do not float.

SCK2 (L3): Serial SPI Clock Output, Referenced to VCC2

and GND2. Logic output connected to logic side SCK pin

throughisolationbarrier.Undertheconditionofanisolation

communication failure this output defaults to a low state.

SDI2 (L4): Serial SPI Data Output, Referenced to VCC2

and GND2. Logic output connected to logic side SDI pin

throughisolationbarrier.Undertheconditionofanisolation

communication failure this output defaults to a low state.

CS2 (L5): Serial SPI Chip Select, Referenced to VCC2 and

GND2.LogicoutputconnectedtologicsideCSpinthrough

isolation barrier. Under the condition of an isolation com-

munication failure this output defaults to a high state.

VCC2 (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 2.2µF.

V– (L7): –5V Nominal Isolated Supply Voltage. Internally

generated from VCC by an isolated DC/DC converter and

regulated to –5V with no external components. Internally

bypassed with 2.2µF.

V+ (L8): 5V Nominal Isolated Supply Voltage. Internally

generated from VCC by an isolated DC/DC converter and

regulated to 5V with no external components. Internally

bypassed with 2.2µF.

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, K7, K8): Isolated Ground.

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

The adjust pin voltage is 1.22V Referenced to GND2. See

Applications Information section for details.

(LTM2886-S)

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