Linear Technology LTM2886 Guida rapida alla configurazione

dc1790af

DEMO MANUAL DC1790A

Description

LTM2886

SPI/Digital or I2C µModule Isolator with

Fixed ±5V and Adjustable 5V Regulated Power

Demonstration circuit 1790A is a serialperipheral interface

bus (SPI) or inter-IC bus (I2C) µModule

™

isolator with

fixed ±5V and adjustable 5V regulated power featuring the

LT M

2886. The demo circuit features an EMI optimized

circuit configuration and printed circuit board layout. All

components are integrated into the µModule isolator. The

demo circuit operates from a single external supply on

VCC. The part generates output voltages on VCC2, which L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of

Linear Technology Corporation. All other trademarks are the property of their respective owners.

perForMAnce sUMMArY

operAting principles

may be adjusted by an external programming resistor, and

fixed voltages on V+and V–. It communicates all neces-

sary signaling across the isolation barrier through LTC’s

isolator µModule technology.

Design files for this circuit board are available at

http://www.linear.com/demo

(TA= 25°C)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VCC Input Supply Range LTM2886-5 4.5 5 5.5 V

LTM2886-3 3.0 3 3.6 V

VCC2 Regulated Output Voltage 4.75 5 5.25 V

Adjustable Output Voltage Range 3.0 5.5 V

Current Limit 100 mA

V+Regulated Output Voltage 4.75 5 5.25 V

Current Limit 100 mA

V–Regulated Output Voltage –4.75 –5 –5.25 V

Current Limit 100 mA

fMAX Maximum Data Rate DI1 →O1, Ix →DOx, CL= 15pF 20 MHz

LTM2886-S, Bidirectional Communication

LTM2886-S, Unidirectional Communication

MHz

LTM2886-I 400 kHz

VIORM Maximum Working Insulation Voltage GND to GND2 560 VDC

400 VRMS

Common Mode Transient Immunity 30 kV/µs

The LTM2886 contains an isolated DC/DC conversion

system, including a secondary quadrupler, with multiple

LDOs to deliver power to the three output voltage rails

from VCC. Isolation is maintained by the separation of

GND and GND2 where significant operating voltages and

transients can exist without affecting the operation of the

LTM2886. The logic side ON pin enables or shuts down the

LTM2886. All logic side signals are referenced to the logic

supply pin VL. The LTM2886 is available in two data bus

configurations, SPI (–S) or I2C (–I), and with two input

voltage ranges, 3.0 to 3.6 volts (–3) or 4.5 to 5.5 volts (–5).

dc1790af

DEMO MANUAL DC1790A

SPI signaling is controlled by the logic inputs CS, SDI,

and SCK. SDOE controls the SDO output and is normally

connected to CS. The corresponding isolated side output

signals are CS2, SDI2, and SCK2. SDO2 is the isolated

side SPI data input. All of the SPI communication channels

may be used as generic digital I/O.

I2C signaling is controlled by the logic inputs SDA and

SCL, corresponding to SDA2 and SCL2 on the isolated

side. The SCL channel is unidirectional supporting master

mode only I2C communication. SCL2 output is standard

CMOS push-pull drive. SDA signaling is bidirectional,

and includes an internal current source pull-up on SDA2

supporting up to 200pF of load capacitance.

Demo circuit 1790A is available in four configurations

supporting all versions of the LTM2886. Table 1 details

the demo circuit configurations.

Table 1.

DEMO CIRCUIT INPUT VOLTAGE COMMUNICATION

DC1790A-A 3.0V to 3.6V SPI/Digital

DC1790A-B 4.5V to 5.5V SPI/Digital

DC1790A-C 3.0V to 3.6V I2C

DC1790A-D 4.5V to 5.5V I2C

The demo circuit has been designed and optimized for low

RF emissions. To this end some features of the LTM2886

are not available for evaluation on the demo circuit. The

logic supply voltage VLis tied to VCC on the demo circuit,

and the ON pin is not available on the input pin header,

but may be controlled by jumper JP1. EMI mitigation

techniques used include the following.

1. Four layer PCB, allowing for isolated side to logic side

“bridge” capacitor. The bridge capacitor is formed be-

tween an inner layer of floating copper which overlaps

the logic side and isolated side ground planes. This

structure creates two series capacitors, each with

approximately .008” of insulation, supporting the full

dielectric withstand rating of 2500VRMS. The bridge

capacitor provides a low impedance return path for

injected currents due to parasitic capacitances of the

LTM2886’s signal and power isolating elements.

2. Discrete bridge capacitors (C3, C4) mounted between

GND2 and GND. The discrete capacitors provide ad-

ditional attenuation at frequencies below 400MHz.

Capacitors are safety rated type Y2, manufactured by

Murata, part number GA342QR7GF471KW01L.

3. Board/ground plane size has been minimized. This

reduces the dipole antenna formed between the logic

side and isolated side ground planes.

4. Top signal routing and ground floods have been opti-

mized to reduce signal loops, minimizing differential

mode radiation.

5. Common mode filtering is integrated into the input and

output pin headers. Filtering helps to reduce emissions

caused by conducted noise and minimizes the effects

of cabling to common mode emissions.

6. A combination of low ESL and high ESR decoupling is

used. A low ESL ceramic capacitor is located close to

the moduleminimizing highfrequency noiseconduction.

A high ESR tantalum capacitor is included to minimize

board resonances and prevent voltage spikes due to

hot plugging of the supply voltage.

EMI performance is shown in Figure 1, measured using

a Gigahertz Transverse Electromagnetic (GTEM) cell and

method detailed in IEC 61000-4-20, “Testing and Mea-

surement Techniques – Emission and Immunity Testing

in Transverse Electromagnetic Waveguides”.

operAting principles

dc1790af

DEMO MANUAL DC1790A

operAting principles

Figure 1. DC1790A Radiated Emissions

LTM2886 Low EMI Demo Board Radiated Emissions

The demo circuit includes provisions for programming

the VCC2 voltage rail. Resistor R5 allows the VCC2 power

rail to be reduced from its nominal operating voltage of

5V. The formula presented in Table 2 allows selection of

the appropriate resistor value.

Table 2.

VOLTAGE RAIL RESISTOR TO REDUCE OUTPUT

VCC2 R5 = 61.9k • (VCC2–1.22)/(5–VCC2)

dc1790af

DEMO MANUAL DC1790A

TECHNOLOGY

VIN

– +

Figure 2. Demo Board Setup

qUick stArt proceDUre

Demonstration circuit 1790A is easy to set up and evalu-

ate the performance of the LTM2886. Refer to Figure 2

for proper measurement equipment setup and follow the

procedure below.

NOTE: When measuring the input or output voltage ripple

or high speed signals, care must be taken to avoid a long

ground lead on the oscilloscope probe.

1. Install JP1 in the ON (default) position.

2. With power off, connect the input power supply to VCC

and GND on pin header J1.

3. Turn on the power at the input.

NOTE: Make sure that the input voltage does not exceed 6V.

4. Check for the proper output voltages. VCC2 = 5V,

V+= 5V, and V–= –5V on pin header J2.

5. Once the proper output voltages are established, con-

nect signals to J1 and J2 pin headers as appropriate.

The header pin names and locations are detailed on the

demo board silkscreen below the pin headers.

dc1790af

DEMO MANUAL DC1790A

pcB lAYoUt

Layer 1. Top Layer

Layer 2. Ground Plane

dc1790af

DEMO MANUAL DC1790A

Layer 3. Signal Layer

Layer 4. Bottom Layer

pcB lAYoUt

dc1790af

DEMO MANUAL DC1790A

pArts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 U1 –A

–B

–C

–D

I.C., LTM2886CY-3S

I.C., LTM2886CY-5S

I.C., LTM2886CY-3I

I.C., LTM2886CY-5I

LINEAR LTM2886CY-3S#PBF

LINEAR LTM2886CY-5S#PBF

LINEAR LTM2886CY-3I#PBF

LINEAR LTM2886CY-5I#PBF

Hardware/Components (For Demo Board Only)

2 1 C1 CAP., TANT 10μF 10V 20% TAJA AVX TAJA106M010RNJ

3 1 C2 CAP., CER 1μF 10V 20% 0508 MURATA LLL219R71A105MA01L

4 2 C3, C4 CAP., CER 470pF 250Vac 10% 1808 MURATA GA342QR7GF471KW01L

5 2 J1, J2 0.1” DOUBLE ROW HEADER, 5 ×2 PIN SAMTEC TSW-105-22-G-D

6 2 J1, J2 0.1” FERRITE PLATE, 5 ×2 HOLE FAIR RITE 2644247101

7 1 JP1 2mm SINGLE ROW HEADER, 3-PIN SAMTEC TMM-103-02-L-S

8 1 JP1 SHUNT SAMTEC 2SN-BK-G

9 1 R1 –C

–D

RES., CHIP 10kΩ 1% 0805

YAGEO RC0805FR-0710KL

10 1 R2 –C

–D

RES., CHIP 10kΩ 1% 0805

YAGEO RC0805FR-0710KL

11 1 R3 –C

–D

RES., CHIP 0 0805

YAGEO RC0805FR-070RL

12 1 R4 –A

–B

RES., CHIP 0 0805

YAGEO RC0805FR-070RL

dc1790af

DEMO MANUAL DC1790A

scheMAtic DiAgrAM

GND2

470pF

1808

470pF

1808

PCB SUBSTRATE 'BRIDGE' CAPACITOR, 20pF TOTAL TOP COPPER TOP COPPER

INNER LAYER 1

OPEN

1uF

0508

JP1

10uF

3216

OPEN

3 4

910

VCC

DI1

DNC

DO1

GND

SDA

SCL

DO2

LTM2886-I

VCC

CSB

DO2

DO1

GND

SDI

SCK

SDO

LTM2886-S

V-

VCC2

SDA2

SCL2

V+

GND2

DNC

LTM2886-I

V-

VCC2

SDI2

SCK2

SDO2

V+

GND2

CS2B

LTM2886-S

OPEN

OFF

-11ST PROTOTYPE KEITH B. 12-2-10

HGFEDCBA

TITLE: SCHEMATIC

SIZE IC NO. REV.

DATE: SHEET OF

APPROVALS

SCALE = NONE

CUSTOMER NOTICE

Wednesday, August 10, 2011

SPI/DIGITAL OR I2C uMODULE ISOLATOR, LOW EMI

KEITH B.

1 1

LTM2886CY-3S/-5S

DEMO CIRCUIT 1790A

ETADDEVORPPAVEROCE

REVISION HISTORY

DESCRIPTION

1630 McCarthy Blvd.

Milpitas, CA 95035

Phone: (408) 432-1900

Fax: (408) 434-0507

www.linear.com

LTC CONFIDENTIAL

FOR CUSTOMER

USE ONLY

THIS CIRCUIT IS PROPRIETARY TO

LINEAR TECHNOLOGY AND SUPPLIED FOR

USE WITH LINEAR TECHNOLOGY PARTS.

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT

TO DESIGN A CIRCUIT THAT MEETS CUSTOMER -

SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS

THE CUSTOMERS RESPONSIBILITY TO VERIFY

PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND

PRINTED CIRCUIT LAYOUT MAY SIGNIFICANTLY

AFFECT CIRCUIT PERFORMANCE OR RELIABILITY.

CONTACT LINEAR TECHNOLOGY APPLICATIONS

ENGINEERING FOR ASSISTANCE.

TECHNOLOGY

PCB DES.

APP ENG.KEITH B.

INPUT CONNECTOR OUTPUT CONNECTOR

N/A

NOTES: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE IN OHMS, 0805.

ALL CAPACITORS ARE IN MICROFARADS, 0805.

ASSY U1 VCC

LTM2886CY-3S

-A 3.0V - 3.6V

LTM2886CY-5S-B 4.5V - 5.5V

VCC

SCK

V+ L8

SDI

V- L7

DO2

SDOE

A6 ON

A8 VCC

SDI2 L4

CS2L5

AVCC2K6

VCC2L6

SDO

DO1

GND

SCK2L3

I2 L2

SDO2L1

I1 K1

GND2K4

LTM2886CY-*

DC1790A-A/B

dc1790af

DEMO MANUAL DC1790A

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

scheMAtic DiAgrAM

DC1790A-C/D

GND2

SCL

DI1

V+ L8

SDA

V- L7

DNC

GND1

A6 ON

A8 VCC

SDA2L4

O1 L5

AVCC2K6

VCC2L6

DO2

DO1

GND

SCL2L3

DNCL2

I2 L1

I1 K1

GND2K4

LTM2886CY-*

470pF

1808

470pF

1808

PCB SUBSTRATE 'BRIDGE' CAPACITOR, 20pF TOTAL TOP COPPER TOP COPPER

INNER LAYER 1

OPEN

1uF

0508

JP1

10uF

3216

10k

3 4

910

VCC

DI1

DNC

DO1

GND

SDA

SCL

DO2

LTM2886-I

VCC

CSB

DO2

DO1

GND

SDI

SCK

SDO

LTM2886-S

V-

VCC2

SDA2

SCL2

V+

GND2

DNC

LTM2886-I

V-

VCC2

SDI2

SCK2

SDO2

V+

GND2

CS2B

LTM2886-S

OPEN

OFF

-11ST PROTOTYPE KEITH B. 12-2-10

HGFEDCBA

TITLE: SCHEMATIC

SIZE IC NO. REV.

DATE: SHEET OF

APPROVALS

SCALE = NONE

CUSTOMER NOTICE

Wednesday, July 27, 2011

SPI/DIGITAL OR I2C uMODULE ISOLATOR, LOW EMI

KEITH B.

1 1

LTM2886CY-3I/-5I

DEMO CIRCUIT 1790A

ETADDEVORPPAVEROCE

REVISION HISTORY

DESCRIPTION

1630 McCarthy Blvd.

Milpitas, CA 95035

Phone: (408) 432-1900

Fax: (408) 434-0507

www.linear.com

LTC CONFIDENTIAL

FOR CUSTOMER

USE ONLY

THIS CIRCUIT IS PROPRIETARY TO

LINEAR TECHNOLOGY AND SUPPLIED FOR

USE WITH LINEAR TECHNOLOGY PARTS.

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT

TO DESIGN A CIRCUIT THAT MEETS CUSTOMER -

SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS

THE CUSTOMERS RESPONSIBILITY TO VERIFY

PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND

PRINTED CIRCUIT LAYOUT MAY SIGNIFICANTLY

AFFECT CIRCUIT PERFORMANCE OR RELIABILITY.

CONTACT LINEAR TECHNOLOGY APPLICATIONS

ENGINEERING FOR ASSISTANCE.

TECHNOLOGY

PCB DES.

APP ENG.KEITH B.

INPUT CONNECTOR OUTPUT CONNECTOR

N/A

NOTES: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE IN OHMS, 0805.

ALL CAPACITORS ARE IN MICROFARADS, 0805.

ASSY U1 VCC R1 R2 R3 R4

LTM2886CY-3I-C 3.0V - 3.6V 10K 10K 0 OPT

LTM2886CY-5I

-D 4.5V - 5.5V 10K 10K 0 OPT

VCC

dc1790af

DEMO MANUAL DC1790A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

 LINEAR TECHNOLOGY CORPORATION 2014

LT 0214 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:

This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT

OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete

in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety

measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union

directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.

If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date

of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU

OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS

FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR

ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims

arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all

appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or

agency certified (FCC, UL, CE, etc.).

No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.

Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and

observe good laboratory practice standards. Common sense is encouraged.

This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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