LTM2887 datasheet(9/30 Pages) AD

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LTM2810

Rev. A

For more information www.analog.com

PIN FUNCTIONS

I3 (X1): Digital Input, Referenced to VL2 and GND2. Logic

input connected to DO3 through the isolation barrier. The

logic state on I3 translates to the same logic state on DO3.

Connect to GND2 or VL2 if not used.

I2 (X2): Digital Input, Referenced to VL2 and GND2. Logic

input connected to DO2N and DO2P through the isolation

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

state on DO2N and DO2P. Connect to GND2 or VL2 if not

used.

I1 (X3): Digital Input, Referenced to VL2 and GND2. Logic

input connected to DO1 through the isolation barrier. The

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

Connect to GND2 or VL2 if not used.

ON2 (X4): Enable, Referenced to VL2 and GND2. Enables

data communication through the isolation barrier. If ON2

is high the part is enabled and communications are func-

tional to the logic side. If ON2 is low the isolated side is

held in reset, O1, O2N and O2P are in a low state, and O3

is in a high state. Connect to VL2 if not driven.

VL2 (X5, X6): Logic Supply, Referred to GND2. Interface

supply voltage for pins O1, O2P, O3, I1, I2, I3, O1E, and

ON2. Operating voltage is 3V to 5.5V. Internally bypassed

with 6.6μF.

GND2 (V1 to V3, V5, W6): Isolated Ground.

LTM2810-I, Logic Side

DI3 (A1): Digital Input, Referenced to VL and GND. Logic

input connected to O3 through the isolation barrier. The

logic state on DI3 translates to the same logic state on

O3. Connect to GND or VL if not used.

SDA (A2, B2): Serial I2C Data Pins, Referenced to VL and

GND. Bidirectional logic pins connected to isolated side

SDA2 pins through the isolation barrier. Under the condi-

tion of an isolation communication failure pins are in a

high impedance state. Pull up to VL if not used.

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

GND. Logic input connected to isolated side SCL2 pin

through the isolation barrier. Clock is unidirectional from

logic to isolated side. Pull up to VL if not used.

ON (A4): Enable, Referenced to VL and GND. Enables data

communication through the isolation barrier. If ON is high

the part is enabled 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. Connect

to VL if not driven.

VL (A5): Logic Supply. Interface supply voltage for pins

SCL, DI3, DO1, DO3, and ON. Operating voltage is 3V to

5.5V. Internally bypassed with 1μF.

ST1, ST2 (A6, C6): Bridge Driver Outputs, Referenced

to PVCC and GND. Each output runs at 50% duty cycle,

ST1 is 180 degrees out of phase with ST2. Operating

frequency is 2MHz. Bridge driver is enabled when PVCC

is between 3V to 5.5V and ON is high.

DO3 (B1): Digital Output, Referenced to VL and GND.

Logic output connected to I3 through the isolation bar-

rier. Under the condition of an isolation communication

failure this output is in a high impedance state.

DO1 (B4): Digital Output, Referenced to VL and GND.

Logic output connected to I1 through the isolation bar-

rier. Under the condition of an isolation communication

failure this output is in a high impedance state.

PVCC (B5): Bridge Driver Supply Voltage. Operating volt-

age is 3V to 5.5V, connect to GND to disable bridge driver.

Internally bypassed with 2.2μF.

VCC (C5): Supply Voltage. Operating voltage is 3V to 5.5V.

Internally bypassed with 1μF.

GND (B3, B6, C1 to C4): Circuit Ground.

LTM2810-I, Isolated Side

VIN (V6): Internal LDO Input Voltage. Operating voltage is

3.6V to 38V. Bypassed with 0.1μF.

O3 (W1): Digital Output, Referenced to VL2 and GND2.

Logic output connected to DI3 through the isolation bar-

rier. Under the condition of an isolation communication

failure O3 defaults to a high state.

SDA2 (W2, W3, X2): Serial I2C Data Pins, Referenced

to VL2 and GND2. Bidirectional logic pins connected to

logic side SDA pins through the isolation barrier. Output

is biased high by a 1.8mA current source. Do not connect

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