Linear Technology DC1697A Guida rapida alla configurazione

dc1697af

DEMO MANUAL DC1697A

DESCRIPTION

LTC2945

Wide Range I2C Power Monitor

Demonstration circuit 1697A features the LTC2945. The

LTC2945 is a rail-to-rail system monitor that measures

current, voltage, and power. It features an operating range

of 2.7V to 80V and includes a shunt regulator for supplies

above 80V to allow flexibility in the selection of input sup-

ply. The current common mode measurement range of

0V to 80V is independent of the input supply. An onboard

0.75% accurate 12-bit ADC measures load current, input

voltage and an auxiliary external voltage. A 24-bit power

value is generated by digitally multiplying the measured

12-bit load current and input voltage data. Minimum and

L, LT, LTC, LTM, QuikEval, Linear Technology and the Linear logo are registered trademarks of

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

BOARD PHOTO

maximum values are stored and an overrange alert with

programmablethresholdsminimizestheneedforsoftware

polling. Data is reported via a standard I2C interface. The

demo board is populated for a 5A application. This can

be changed by populating R1 accordingly.

Design files for this circuit board are available at

http://www.linear.com/demo

Figure 1. Proper Test Equipment Setup

4V TO 80V

TO DC590

LOAD

dc1697A F01

dc1697af

DEMO MANUAL DC1697A

QUICK START PROCEDURE

Jumper Settings

VDD_SEL: Selects the VDD source. It can be set to VIN,

INTVCC or EXTVDD (which requires a voltage to be present

at the EXTVDD turret.) Please see Hardware Configura-

tion section for examples of how these different jumper

settings are used.

SDA: connectsorseparatestheSDAItoSDAOpins.Foruse

with QuikEval

™

, leave it on TIE. The pins can be separated

in order to test applications using optoisolation.

ADR0,ADR1:SelectstheI2Cslave address of theLTC2954.

Any changes here should also be made inside of QuikEval

for communications to persist.

External Connections

Signal connections are made via the row of turret posts

along the edges of the board.

GND: (4 turrets)These turrets are connected directly to

the ground planes.

VIN: Used as a supply and current sense input for the

internal current sense amplifier. Depending on the

configuration of VDD_SEL, can also be tied to EXTVDD.

EXTVDD: High Voltage Supply Input. This pin powers an

internal series regulator with input voltages ranging from

5V to 80V and produces 5V for INTVCC when above 7V.

INTVCC: Internal Low Voltage Supply Input/Output. This

turret is used to power internal circuitry and can be con-

figured as a direct input, as a linear regulator from a higher

voltage connected to VDD or as a shunt regulator. Please

see LTC2945 data sheet for more details.

ADIN: ADC input measured by the onboard ADC. Can

measure between 0V and 2.048V.

VPU: Pull up voltage for the _ALERT LED. Connected on

this board to a 5V isolated supply on the DC590. If a DC590

is not used and the DC1697A is operated independently,

a 5V supply should be provided here.

Digital Connections

SCL: I2C Clock turret

SDA/SDAI: I 2CBusDatainput,canbetiedtoSDAOthrough

the SDA Jumper.

SDAO: I2C Bus Data output. Should be connected to SDAI.

ALERT:Fault Alert Output. Connected to ALERT LED. Open

Drain logic output that is pulled to ground after an event

resulting in a fault occurs.

LEDs

ALERT: Will light up red on an ALERT condition. Can also

be monitored on the ALERT turret.

INTVCC: Will light up green when INTVCC is providing

power.

Operating Principles

The DC1697A was designed to be connected to the DC590

and controlled through the QuikEval suite of software. All

thresholds can be set and ADC registers read back through

the QuikEval interface, which was designed to provide a

convenient way to evaluate the LTC2945.

dc1697af

DEMO MANUAL DC1697A

HARDWARE SETUP

Due to having separate VDD and SENSE pins, the LTC2945

offers great flexibility in terms of supply options. The fol-

lowingare some examples of how to connect and set up the

DC1697A based on different supply input configurations.

In order for the DC1697A to function, power must be

applied. If the VDD_SEL jumper is set to VIN, then VDD and

VIN are connected. At this point, as long as 4V to 80V is

provided at VIN the part will function correctly. However,

should VDD_SEL be tiedto EXTVDD then aseparate voltage

source should be provided at the EXTVDD turret. Should

VDD_SEL be tied to INTVCC then, if VIN is less than 7V,

a 5V supply should be provided at the INTVCC turret. This

is illustrated in the following figures.

If the system is connected properly, the INTVCC green

LED should be lit and the ALERT red LED should be off.

Figure 2. DC1797A Is Powered from Supply Being Monitored

Jumper VDD_SEL Set to VIN to Tie VDD to VIN

4V TO 80V

LOAD

dc1697A F02

dc1697af

DEMO MANUAL DC1697A

HARDWARE SETUP

Jumper VDD_SEL set to INTVCC with a resistor connected

from DC1697 GND to circuit ground.

Note: The DC590 provides isolation and level shifting, as

the I2C interface is operating at 5.9V to 6.7V below the

supply being monitored.

The 5k shunt resistor shown provides 15mA to INTVCC at

80V. The allowable range of resistance for a given input

range is given by the following formula:

VS(MAX) – 5.9V

35mA ≤RSHNT ≤VS(MIN) – 6.7V

1m A +ILOAD(MAX)

> 80V

dc1697A F03

Figure 3. Powering DC1697A Using High-Side Shunt Regulator to Allow for Input Voltage Higher Than 80V

Jumper VDD_SEL Set to INTVCC With A Resistor Connected from DC1697 GND to Circuit Ground

dc1697af

DEMO MANUAL DC1697A

HARDWARE SETUP

Figure 4. Powering DC1697A Through Low-Side Shunt Regulator in High-Side Current Sense Topology

Jumper VDD_SEL Set to INTVCC with a Resistor Connected to INTVCC

0V TO 80V

> 80V

LOAD

dc1697A F04

dc1697af

DEMO MANUAL DC1697A

HARDWARE SETUP

Figure 5. Current Monitoring in a –48V System with the DC590 Providing Isolation

Jumper VDD_SEL set to EXTVDD with the –48V input tied

to VIN and GND and the –48V Return tied to EXTVDD. The

DC590 provides isolation and level shifting, as the I2C

interface is operating at –48V with respect to –48V RTN,

which is normally at earth ground potential.

–48V RETURN

–48V INPUT

–48V RETURN

LOAD

dc1697A F05

TO DC590 (PROVIDES ISOLATION)

dc1697af

DEMO MANUAL DC1697A

SOFTWARE SETUP

Figure 6.

The DC1697A control panel was designed to allow the user

to quickly evaluate the LTC2945. The user has the ability to

set fault thresholds, enable/disable and clear alerts as well

as change the source for the VIN measurement. RSense

is set to 20mΩ by default on the DC1697A, should any

changes be made to the board, the corresponding value

should be entered into the Software GUI. By pressing

RUN, the software interface will begin using the DC590

for data collection.

The Alert Persist option modifies how the ALERT pin and

LED on the board react. With Alert Persist checked, on

an ALERT the corresponding FAULT button will light up

red on the software GUI. The ALERT LED should also be

red on the DC1697A itself. Click the Clear Alerts button

to clear all alerts.

With Alert Persist not enabled, an alert event will still light

up the corresponding FAULT button, however the ALERT

LED on the board will turn on briefly before turning off due

to a read by the GUI from the Fault Register. The QuikEval

GUI constantly polls registers in order to properly graph

and monitor the part. In a real world situation, these re-

peated reads are not necessary. The Alert Persist option

was designed to simulate real world behavior while still

providing a friendly GUI interface.

dc1697af

DEMO MANUAL DC1697A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

1 1 C1 Cap., X7R, 0.1μF, 100V, 10%, 1206 AVX 12061C104KAT2A

2 1 C2 Cap., X7R, 1000pF, 100V, 10%, 0603 AVX 06031C102KAT2A

3 2 C3, C4 Cap., X5R, 0.1μF, 25V, 20%, 0603 AVX 06033D104KAT2A

4 1 D1 Voltage Supressor, 75V DIODES/ZETEX SMAJ75A-13-F

5 1 D2 LED, GRN PLCC-2 (B-Size) VISHAY VLMC3101-GS08

6 1 D3 LED, RED PLCC-2 (B-Size) VISHAY VLMS3000-GS08

7 4 E1, E2, E3, E4 Turret, Testpoint .062 Thick Brd. MILL-MAX 2501-2-00-80-00-00-07-0

8 10 E5-E14 Turret, Testpoint 0.063" MILL-MAX 2308-2-00-80-00-00-07-0

9 1 JP1 Headers, Double. Row 2 ×3 100Mil CTRS. SAMTEC TMM-103-02-L-D

10 1 JP2 Headers, Single. Row 3 Pins 2mm CTRS. SAMTEC TMM-103-02-L-S

11 2 JP3, JP4 Headers, 4 Pins 2mm CTRS. SAMTEC TMM-104-02-L-S

12 1 J1 Header, 2 mm CTRS MOLEX, 878 31-1420

13 1 Q1 N-Channel, MOSFET SOT23 DIODES/ZETEX. 2N7002-7-F

14 1 R1 Res., LRC 0.020, 1.0W, 1%, 2010 IRC LRF20 10LF-01-R020-F

15 1 R2 Res., Chip 51, 0.1W, 5%, 0603 VISHAY CRCW060351R0JNEA

16 1 R3 Res., Chip 10k, 0.1W, 5%, 0603 VISHAY CRCW060310K0JNEA

17 0 R4, R5 (OPT) Res., 0603

18 3 R6, R7, R8 Res., Chip 5.1k, 0.1W, 5%, 0603 VISHAY CRCW06035K10JNEA

19 2 R9, R10 Res., Chip 3.3k, 0.1W, 5%, 0603 VISHAY CRCW06033K30JNEA

20 0 TP1 (OPT) Jumper, 2 Pins 2mm CTRS. SAMTEC TMM-102-02-L-S

21 1 U1 I.C., Volt Reg. QFN(12) (UD) 3mm ×3mm LINEAR TECHNOLOGY CORP. LTC2945CUD

22 1 U2 I.C., Serial EEPROM TSSOP-8 MICROCHIP 24L C025-I/ST

23 4 SHUNTS AS SHOWN ON

ASSY DWG

Shunt, 2mm CTRS. SAMTEC 2SN-BK-G

dc1697af

DEMO MANUAL DC1697A

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

A A

C C

D D

2. INSTALL SHUNTS AS SHOWN.

1. ALL RESISTORS ARE IN OHMS, 0603.

ALL CAPACITORS ARE IN MICROFARADS, 0603.

NOTES: UNLESS OTHERWISE SPECIFIED

QUICK EVAL DEMO ONLY

HIGH VOLTAGE LINES

VPU

INTVCC

SCL

SDA/SDAI

/ALERT

INTVCC

VIN VOUT

SIZE

DATE:

.VER.ONCI

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

DEMO CIRCUIT 1697A

10/26/2012, 06:09 PM

WIDE RANGE I2C POWER MONITOR

N/A LTC2945CUD

KIM T.

MARK T.

SIZE

DATE:

.VER.ONCI

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

DEMO CIRCUIT 1697A

10/26/2012, 06:09 PM

WIDE RANGE I2C POWER MONITOR

N/A LTC2945CUD

KIM T.

MARK T.

SIZE

DATE:

.VER.ONCI

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

DEMO CIRCUIT 1697A

10/26/2012, 06:09 PM

WIDE RANGE I2C POWER MONITOR

N/A LTC2945CUD

KIM T.

MARK T.

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MARK T.

PRODUCTION

__ 21-62-014

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MARK T.

PRODUCTION

__ 21-62-014

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MARK T.

PRODUCTION

__ 21-62-014

0.1uF

MOLEX

87831-1420

TO DC590B

MOLEX

87831-1420

TO DC590B

VUNREG

GND

SCK/SCL

MISO

SDA/MOSI

GND

EESDA

9EEVCC

EESCL

EEGND

GND

(OPT)

0603

(OPT)

0603

5.1K

JP1

VIN

INTVCC

EXTVDD

VDD_SEL

JP1

VIN

INTVCC

EXTVDD

VDD_SEL

(OPT)

0603

(OPT)

0603

E14

ADIN E14

ADIN

5.1K

E4 GND

E12VPU

E7 SDAO

TP1

(OPT)

TP1

(OPT)

R10

3.3K

R10

3.3K

5.1K

0.1uF

100V

1206

0.1uF

100V

1206

GRN

INTVCC

VLMC3101

GRN

INTVCC

VLMC3101

JP2

TIE

UNTIE

SDA

JP2

TIE

UNTIE

SDA

JP4

FLOAT

ADR1

JP4

FLOAT

ADR1

RED

ALERT

VLMS3000

RED

ALERT

VLMS3000

EXPOSED PAD

LTC2945CUD

EXPOSED PAD

LTC2945CUD

SENSE+

SENSE-

VDD

INTVCC

ADR0

ADR1

ALERT 9

SDAO 8

SDAI 7

ADIN

GND

SCL

EXTVDDE6

EXTVDD

JP3

FLOAT

ADR0

JP3

FLOAT

ADR0

0.1uF

E11SCL

1000pF

100V

1000pF

100V

2N7002

E13

GND E13

GND

VIN

0V - 80V

VIN

0V - 80V

GND E2

GND

E9 SDAI

0.020

2010

0.020

2010

INTVCC E8

INTVCC

E10GND

10K

24LC025-I/ST

VSS

VCC 8

WP 7

SCL 6

SDA 5

E5 ALERT

SMAJ75A-13-F

3.3K

E3 VOUT

dc1697af

DEMO MANUAL DC1697A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0113 • 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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