DC2574A-KIT - ANALOG DEVICES

dc2574akitf

DEMO MANUAL

DC2574A-KIT

DESCRIPTION

Standalone ±30A Power/

Energy Monitor with LCD

The DC2574A-KIT is a standalone power/energy monitor

that allows users to evaluate the LTC

2947 power/energy

monitor without a PC. This document describes how to

quickly set up and operate the DC2574A-KIT; users should

also refer to the DC2334 demo manual and LTC2947 data

sheet for more details. The DC2574A-KIT includes all

components required for stand-alone operation except

for a power supply and load. The DC2574A-KIT operates

with any USB compatible power supply and any load

compatible with the LTC2947.

The DC2574A-KIT includes the following items:

n DC2334A: LTC2947 Demo Circuit

n DC2026: Linduino

One with Pre-Programmed

“LTC2947 - DC2574A_KIT Linduino.INO File”

Make sure the DC2334A demo board is configured for I2C

mode (JP5, JP6) with AD0, AD1 both being set to the L

position (JP8, JP7) which sets the slave address to 0x5C.

This is the factory default setting of the jumpers on the

DC2334 demo board.

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

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

respective owners.

CONNECTIONS

n LCD Keypad Shield

n USB Cable: Power Supply And Optional Communica-

tion Interface for Operating with the GUI

n 14-pin Ribbon Cable. Only necessary for usage of

the Linduino with some other LTC demo boards, see

Linduino DC590 Mode section on how to reprogram

the supplied Linduino for full compatibility with

QuikEval

The KIT is provided fully assembled and all boards plugged

together (LCD on top of DC2334A on top of DC2026) for

easy usage without soldering anything.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2574A-KIT

Connect an external supply (0V to 15V) and load (±30A)

to be monitored by the LTC2947 and plug in a USB power

supply to the USB port of the Linduino. See the DC2334

demo manual for more information on possible measure-

ment configurations.

Figure 1. DC2574A-KIT Connection Diagram

15.0 00A 10.000V

150.00W 25.0 °C

OV TO 15V

0A TO 30A

LOAD

USB

SUPPLY

–

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DEMO MANUAL

DC2574A-KIT

OPERATION

CONNECTIONS

Upon power up, the LCD shows four numerical values.

They correspond to the current, voltage, die temperature

and power measurements, in clockwise order.

Description Example

Current Voltage 0.003A 0.000V

Power Die Temperature 0.000W 25.0 °C

The keys of the LCD keypad shield are used to select what

values are displayed.

Key Description

LEFT, RIGHT Press and hold to navigate through and select

measurement group to be displayed

UP, DOWN Press and hold to navigate through and select status/

alerts registers to be displayed.

SELECT Clear accumulators and tracking registers. Press and hold

this key until the display shows the message CLEAR. After

releasing the key again the clearing will be acknowledged

by the message ****CLEARED*****

RST Reset the controller (the Linduino) and start over. This will

not reset the LTC2947

MEASUREMENT GROUPS (LEFT, RIGHT KEYS)

Press and hold the LEFT or RIGHT key to cycle through

and select the measurement group to be displayed. As the

RIGHT key is held down, the display will cycle through the

following measurement groups (the same applies to the

LEFT key but it will cycle through measurement groups

in the opposite order):

I V Current (I), Voltage (V),

P TEMP Power (P) and Temperature (TEMP) Measurement

↓

C1 VDVCC Charge1 (C1), LTC2947 Supply Voltage (VDVCC),

E1 TB1 Energy1 (E1), Time Base 1 (TB1)

↓

C2 VDVCC Charge2 (C2), LTC2947 Supply Voltage (VDVCC),

E2 TB2 Energy2 (E2), Time Base 2 (TB2)

↓

IMIN IMAX Minimum/Maximum Current (IMIN, IMAX),

PMIN PMAX Minimum/Maximum Power (PMIN, PMAX)

↓

VMIN VMAX Minimum/Maximum Voltage (VMIN, VMAX),

TMIN TMAX Minimum/Maximum Temperature (TMIN, TMAX)

↓

TMIN TMAX Minimum/Maximum Temperature (TMIN, TMAX),

VDMIN VDMAX Minimum/Maximum LTC2947 Supply Voltage

(VDMIN, VDMAX)

↓

CYCLE ALL If “CYCLE ALL measurements” is selected, the display

will cycle through all available measurement groups.

measurements

Note: If you use the USB port of a PC as a power supply,

the board will make periodic resets. This is caused by

Windows and the USB COM port driver accessing the

COM port assigned to the Linduino. This can be prevented

by making a connection via a serial terminal (see Serial

Terminal Operation) or via the LTC2947 GUI (see QuikEval/

GUI Operation) to the COM port of the Linduino. If a plain

external USB power supply is used, this problem does

not appear.

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DEMO MANUAL

DC2574A-KIT

OPERATION

Once the key is released the measurements of the selected

group will be displayed.

Measurement Report

The measurement results will be reported in the follow-

ing units:

Measurement Unit Description Example

Current A Amperes 1.003A

Voltage V Volts 5.200V

Power W Watts –99.050W

Charge mAh, kAh, Ah (milli, kilo) ampere hours 999mAh

Energy mWh, kWh, Wh (milli, kilo) watt hours 120Wh

Time s, m, h, d Seconds, minutes, hours,

days

1d3h

The tracking-registers that store the minimum and maxi-

mum values of measurements are reported in the following

way: VALMIN...VALMAX, e.g. –10.03A...12.00A.

STATUS/ALERT REGISTERS (UP, DOWN KEYS)

Press and hold the UP or DOWN key to cycle through

and select a status/alert registers to be displayed. As the

DOWN key is held down, the display will cycle through

the following status/alert registers (the same applies to

the UP key but it will cycle through status/alert registers

in the opposite order):

STATUS,ALERTS:

STATUS

↓

→See the table on the following

page for descriptions.

STATUS,ALERTS:

STATVT

↓

STATUS,ALERTS:

STATIP

↓

STATUS,ALERTS:

STATC

↓

STATUS,ALERTS:

STATE

↓

STATUS,ALERTS:

STATCEOF

↓

STATUS,ALERTS:

STATTB

↓

STATUS,ALERTS:

STATVDVCC

↓

STATUS,ALERTS: If “CYCLE ALL measurements” is selected, the display

will cycle through all available status/alert registers.

CYCLE ALL

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DEMO MANUAL

DC2574A-KIT

OPERATION

Status/Alerts Report

The contents of the status/alert registers are reported by

mnemonics. Due to restricted number of characters, the

LCD shows acronyms for some of the registers and bit

names.

Only the bits that are set (1) are reported. Bits that are

cleared (0) won’t be reported.

ACRONYM

DATA SHEET

NAME DESCRIPTION

STAT STATUS The Status Register reports the status of

Reference Clock Errors

UVA UVLOA Undervoltage in the Analog Domain Including

ADCs During a Conversion

POR PORA Power-On Reset Has Occurred Due to

Undervoltage in the Analog Domain

UVS UVLOSTBY Undervoltage in the Standby Domain

UVD UVLOD Undervoltage in the Digital Domain

UPD UPDATE Result Registers Have Been Updated

(Measurement Was Performed)

AER ADCERR The ADC Conversion Is Not Valid Due to

Undervoltage During a Conversion

TER TBERR Overflow of the Internal Timebase Register.

The Values of Accumulated Result Registers

Are Invalid

STATVT STATVT Voltage, Temperature Threshold Alerts

VH VH Voltage VD High Threshold Exceeded

VL VL Voltage VD Low Threshold Exceeded

TEH TEMPH Temperature High Threshold Exceeded

TEL TEMPL Temperature Low Threshold Exceeded

FH FANH Fan High Temperature Threshold Exceeded

FL FANL Fan Low Temperature Threshold Exceeded

ACRONYM

DATA SHEET

NAME DESCRIPTION

STATIP STATIP Current, Power Threshold Alerts

IH IH Current High Threshold Exceeded

IL IL Current Low Threshold Exceeded

PH PH Power High Threshold Exceeded

PL PL Power Low Threshold Exceeded

STATC STATC Charge Thresholds Alerts

C1H C1H Charge 1 High Threshold Exceeded

C1L C1L Charge 1 Low Threshold Exceeded

C2H C2H Charge 2 High Threshold Exceeded

C2L C2L Charge 2 Low Threshold Exceeded

STATE STATE Energy Threshold Alerts

E1H E1H Energy 1 High Threshold Exceeded

E1L E1L Energy 1 Low Threshold Exceeded

E2H E2H Energy 2 High Threshold Exceeded

E2L E2L Energy 2 Low Threshold Exceeded

STATCEOF STATCEOF Charge, Energy Overflow Alerts

C1OF C1OF Charge 1 Overflow Alert

C2OF C2OF Charge 2 Overflow Alert

E1OF E1OF Energy 1 Overflow Alert

E2OF E2OF Energy 2 Overflow Alert

STATTB STATTB Time Base Alerts

1TH TB1TH Time 1 Threshold Exceeded

2TH TB2TH Time 2 Threshold Exceeded

1OF TB1OF Time 1 Overflow

2OF TB2OF Time 2 Overflow

STATVDVCC STATVDVCC VDVCC Threshold Alerts

VDVCCH VDVCCH Voltage at DVCC High Threshold Exceeded

VDVCCL VDVCCL Voltage at DVCC Low Threshold Exceeded

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DC2574A-KIT

SERIAL TERMINAL OPERATION

The DC2574A-KIT can also be operated via a serial terminal

by connecting the Linduino to the USB port of a PC. For

this you can use the Serial Monitor of the Arduino IDE

which can be accessed from the Tools menu as shown

in Figure2.

Make sure to select the right COM port of your Linduino. In

the screenshot in Figure2, COM30 is selected. Depending

on your system and the used USB port, you may see a

different COM port number. One way to identify the right

COM port is to plug and unplug your Linduino and check

in the list of available COM ports which one disappears.

In the serial monitor, set the baud rate to 115200 and select

the “No line ending” option, see Figure3.

Initial output on the serial monitor is:

Hello LTC2947

30A PowerMonitor

LCD found! Enter l or m for options.

Figure 2. Tools Menu

Figure 3.

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DEMO MANUAL

DC2574A-KIT

SERIAL TERMINAL OPERATION

The following table lists the menu items that are shown after entering m or l.

KEY OPTIONS DESCRIPTION

l 0:STATUS

1:STATVT

2:STATIP

3:STATC

4:STATE

5:STATCEOF

6:STATTB

7:STATVDVCC

8:CYCLE ALL

enter 0-8, any other to cancel

Status and Alert Registers Menu. E.g. enter 0 to periodically output the status register via the

serial monitor and on the LCD.

Example output:

STAT:UPD,

UVA,POR,UVS,UVD

See Status/Alert Registers (UP, DOWN Keys) for details.

m 0:I V

P TEMP

1:C1 VDVCC

E1 TB1

2:C2 VDVCC

E2 TB2

3:IMIN IMAX

PMIN PMAX

4:VMIN VMAX

TMIN TMAX

5:TMIN TMAX

VDMIN VDMAX

6:CYCLE ALL

measurements

enter 0-6, any other to cancel

Measurements Menu.

E.g. enter 0 to periodically output Current (I), Voltage (V), Power (P) and Temperature

(TEMP) measurements via the serial monitor and on the LCD.

Example output:

0:I V

P TEMP

0.012A -0.402V

0.000W 29.2°C

See Measurement Groups (LEFT, RIGHT Keys) for details.

Once one of the options is selected the related results

will be periodically reported via the serial monitor and

also via the LCD.

To change the serial output, send again the “m” or “l”

character and select another option to be displayed or any

number >8 to disable the serial output.

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DEMO MANUAL

DC2574A-KIT

QuikEval/GUI OPERATION

The DC2574A-KIT can also be operated via the LTC2947

GUI which is integrated in the QuikEval evaluation system.

If not yet installed, QuikEval may be downloaded from the

linear web page:

http://www.linear.com/quikeval

QuikEval will automatically detect the connected DC2574A-

KIT and download and launch the LTC2947 GUI.

The GUI will automatically connect to the DC2574A-KIT

on start-up. Please refer to the DC2334 demo manual for

details on GUI operation.

There are two limitations when operating DC2574A-KIT

with the GUI:

1. The LTC2947 will always operate in continuous mode. If

the continuous mode is disabled via the operation control

DC2574A-KIT FIRMWARE SOURCE CODE

LINDUINO DC590 MODE

of the GUI it will be enabled again by the DC2574A-KIT

firmware.

2. Shutdown is not possible as the DC2574A-KIT firmware

will wake-up the device again immediately.

3. If the DC2574A-KIT’s LCD displays any of the status/alert

registers, asserted bits reported by the LCD might not

be reported by the GUI and vice versa. This is an result

of the clear-on-read behavior of those bits when read by

two agents (the GUI and the DC2574A-KIT firmware).

This can be avoided by setting the LCD output to any

of the measurement results, use the LEFT/RIGHT keys

for this purpose.

4. Connection to the device is only possible in the GUI’s

Auto mode or with fixed setting to I2C and slave ad-

dress 0x5C.

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.

The DC2574A-KIT uses “LTC2947 - DC2574A_KIT Lin-

duino.INO File” available on:

http://www.linear.com/product/LTC2947#code

or in the LTSketchbook (Linduino library) which can be

downloaded from the Linduino home page:

http://www.linear.com/solutions/Linduino

Once installed, the source code may be accessed within

the Arduino IDE from File → Sketchbook → Part Number

→ 2000 → 2900 → 2947 → DC2574A_KIT

It is possible to reprogram the Linduino that is part of

this kit so it can be used for operation with any other LTC

demo board and QuikEval. This is done by programming

the DC590 Sketch from the LTSketchbook which is acces-

sible within the Arduino IDE from File → Sketchbook →

Utilities → DC590B.

After this change, the Linduino can also be used together

with the DC2334A demo board by connecting the sup-

plied 14-pin ribbon cable to the DC590 connector J4. See

DC2334A demo manual for more details.

dc2574akitf

DEMO MANUAL

DC2574A-KIT

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0916 • 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

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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 application

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