DC1785B - Demo Manual

DEMO MANUAL DC1785B
LTC2991
I2C Temperature, Voltage
and Current Monitor
Description
Demonstration circuit 1785B features the LTC®2991, a high
performance temperature, voltage and current monitor
that uses an I2C interface for communication. It offers
sub-millivolt voltage resolution, 1% current measurement
and 1°C temperature accuracy.
to measure performance. The exposed ground planes allow
proper grounding to prototype circuitry. After evaluating
with Linear Technology’s software, the digital signals can
be connected to the end application’s processor/controller
for development of the serial interface.
DC1785B is a member of Linear Technology‘s QuikEval™
family of demonstration boards. It is designed to allow easy
evaluation of the LTC2991 and may be connected directly
to the target application’s analog signals while using the
DC590 USB Serial Controller board and supplied software
Design files for this circuit board are available at
http://www.linear.com/demo/DC1785B
L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks
and QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
INPUTS
RIBBON CABLE TO DC590
CONTROLLER
Figure 1. Proper Measurement Equipment Set-Up
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DEMO MANUAL DC1785B
quick start procedure
Connect the DC1785B to a DC590 USB Serial Controller
using the supplied 14-conductor ribbon cable. Connect the
DC590 to host PC with a standard USB A/B cable. Run the
evaluation software supplied with DC590 or downloaded
from http://www.linear.com/software. The correct program
will be loaded automatically. Click the COLLECT button to
start reading the input voltage. Details on software features
are documented in the control panel’s help menu.
Software Set-Up
The legend for each input type icon is included below.
Single-Ended (default)
Differential
Diode Temperature
Input sampling can also be turned on and off by left clicking the label of the corresponding input. When an input
is off, the values box below the label will be shaded and
the value will stop updating.
The DC1785B software is designed to give the user access to all LTC2991 functionality and features. There are
several options that may be accessed both through right
and left clicks.
Graph Settings
Input Settings
To pan the graph, hold down the right mouse button while
hovering over the graph and move the mouse in the direction of desired motion. The graph will cease to auto-scroll
after a pan has be initiated, to reactivate the auto-scroll
double left click anywhere on the graph.
By default, all eight inputs are set as single-ended. This may
be modified by either left clicking the input type picture to
cycle through the options or right clicking the picture to
bring up a list of options and left clicking to select.
By default, the QuikEval software will graph V1. To begin
graphing a different input, left click the values box of the
input to be graphed.
Figure 2. Software Screenshot
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DEMO MANUAL DC1785B
quick start procedure
To zoom the graph, left click and drag. To undo any zoom
and re-initiate auto-scroll, double left click anywhere on
the graph.
Tools
There are two tools included in the software package;
both are accessible under the tools menu in the software.
Statistics: The statistics window lists some basic information about the gathered values. It gives mean, standard
deviation, min, max and crest factor. The statistics can be
reset with the reset button.
PWM: The PWM window allows the user to configure the
PWM functionality of the LTC2991. The DC1785B includes
a red LED next to the PWM turret which reflects the duty
cycle of the PWM pin. The pin needs to be enabled in this
window in order for proper functionality to be achieved.
This window also allows the user to set the PWM threshold.
Please see the LTC2991 data sheet for an explanation of
the PWM pin functionality.
HARDware Set-Up
Jumper Settings
V1, V2, V7, V8 – (Default VOLT, VOLT, VOLT, VOLT). These
jumpers can be toggled between VOLT and TEMP. VOLT
connects the corresponding input on the LTC2991 with the
corresponding turret for an external input. TEMP connects
the corresponding input to MMBT (V1 and V2). Please
note that the jumpers should be moved in pairs, V1 and
V2 should both be connected either to VOLT or TEMP and
V7 and V8 should also be both connected to either VOLT
or TEMP. Once set the proper selection should also be
made inside the QuikEval software in the mode selection
box, to reflect any changes made.
Power – (Default DC590) EXTVCC allows the user to
provide the VCC voltage (2.9V to 5V) to the LTC2991 at
turret EXTVCC while DC590(5V) powers the LTC2991 with
5V from the DC590. State of VCC can be seen through
red LED D1.
ADR0, ADR1, ADR2 – (Default LOW, LOW, LOW) These
jumpers are used to select the I2C address for the LTC2991.
When used with QuikEval, the correct address should also
be selected from within the software.
Connection to DC590 Serial Controller
J1 is the power and digital interface connector. Connect
to DC590 serial controller with supplied 14-conductor
ribbon cable.
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DEMO MANUAL DC1785B
quick start procedure
Analog Connections
Digital Connections
Analog signal connections are made via the row of turret
posts along the edge of the board. Also, when connecting
the board to an existing circuit the exposed ground planes
along the edges of the board may be used to form a solid
connection between grounds.
PWM – PWM output pin configurable through the QuikEval
software. State of the PWM pin is reflected quantitatively
through the PWM LED at D2.
GND – (8 turrets) These turrets are connected directly to
the internal ground planes.
EXTVCC – This turret allows the user to provide power to
the LTC2991. Select power jumper accordingly.
V1, V2, V3, V4, V5, V6, V7, V8 – These turrets are used to
provide input voltage to the monitor when the corresponding jumpers are set to the VOLT position.
SDA, SCL – I2C signals brought out to turrets. If DC1785B is
to be run without a DC590 connected or with an alternative
microprocessor, I2C signals can be driven at these points.
If DC590 is not used R4 and R5 (Backside of board) can
be populated with appropriate I2C pull-up values.
GPO – General purpose output pin can be toggled through
QuikEval software.
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DEMO MANUAL DC1785B
parts list
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
0
C1, C2, C3, C4 (OPT)
Capacitor, 0603
OPT
2
2
C5, C6
Capacitor, 0.1µF, 25V, X7R, 10%, 0603
TDK, C1608X7R1E104K (Bal to #1787A)
3
1
D1
LED, Red, J-Type, SMD, Tape/Reel, 1208
Panasonic, LN1251CTR
4
1
D2
LED, Green, J-Type, SMD, Tape/Reel, 1208
Panasonic, LN1351CTR
5
19
E1-E13, E16-E21
Turret, Testpoint, 0.065
Mill-Max, 2308-2-00-80-00-00-07-0
6
2
E14, E15
Turret, Testpoint, 0.095
Mill-Max, 2501-2-00-80-00-00-07-0
7
8
JP1-JP8
Header, 3-Pin, 0.079, Single Row
Samtec, TMM-103-02-L-S
8
1
J1
Connector, Header 14POS 2mm Vert Gold
Molex, 87831-1420
9
1
Q1
Transistor, PNP, –40V, –200MA, SOT23-3
Diodes/Zetex, FMMT3906TA
10
1
Q2
Transistor, NPN, 40V, 350MW, SMD, SOT23-3
Diodes Inc., MMBT3904-7-F
11
1
Q3
MOSFET, N-Channel, 60V, 115mA, SOT23-3
Diodes/Zetex, 2N7002TA
12
3
R1, R2, R3
Resistor, Chip 4.99k, 0.06W, 1%, 0603
Yageo, RC0603FR-074K99L
13
0
R4, R5 (OPT)
Resistor, 0603
OPT
14
2
R6, R7
Resistor, Chip, 330Ω, 0.06W, 5%, 0603
Yageo, RC0603JR-07330RL
15
2
R8, R9 Bal to #1765A
Resistor, Chip, 1k, 0.06W, 5%, 0603
Yageo, RC0603JR-071KL
16
2
TP1, TP2
Testpoint, Test pad
Component Corp., TP-107-02-1
17
1
U1
IC, Temperature, Voltage, Current Monitor MSOP(16)-MS
Linear Technology, LTC2991CMS#PBF
18
1
U2
IC, EEPROM, 2kbit, 400kHz, TSSOP-8
Microchip, 24LC025-I/ST
19
8
XJP1-XJP8
Shunt, .079" Center
Samtec, 2SN-BK-G
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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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
A
B
C
V8
GND
GND
GND
GND
E13
E12
E11
E10
E9
E8
JP4
GND
VOLT
V8
E7
JP3
V7
TEMP
VOLT
E6
E5
E4
V7
V6
V5
V4
V3
E3
E2
JP2
V2
TEMP
VOLT
V2
E1
JP1
V1
TEMP
VOLT
V1
3
2
1
3
2
1
3
2
1
3
2
1
5
Q2
MMBT3904-7-F
Q1
MMBT3906-7-F
8
7
6
5
4
3
2
V8
V7
V6
V5
V4
V3
V2
V1
9
GND
VCC
16
VCC
C5
ADR2
ADR1
ADR0
SDA
4
SCL
PWM
0.1uF
NOTE: UNLESS OTHERWISE SPECIFIED.
1. ALL RESISTORS 0603.
2. ALL CAPACITORS 0603.
C4
(OPT)
C3
(OPT)
C2
(OPT)
C1
(OPT)
1
U1
LTC2991CMS
15
14
13
10
11
12
VCC
PWM
3
2
1
JP5
LOW
HIGH
ADR2
3
3
VCC
3
2
1
JP6
ADR1
LOW
HIGH
VCC
JP7
ADR0
VCC
CUSTOMER NOTICE
LOW
HIGH
R3
4.99K
1%
330
R7
5
6
7
8
2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
C:\PADS PROJECTS\1785B\SCH\1785B_REV1.DSN
0.1uF
C6
4
3
2

SCALE = NONE
LEO C
VCC
V+
TP1
E15
J1
NC
EEGND
EESCL
EESDA
EEVCC
MISO
SDA/MOSI
SCK/SCL
CS
5V
1K
E21
E20
E19
E16
GND
GND
DATE:
N/A
SIZE
LTC2991CMS
1
SHEET 1
DEMO CIRCUIT 1785B
Aug 28, 2014
IC NO.
1
REV.
OF 1

1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
PWM
GPO
TECHNOLOGY
PWM
1K
R9
DC590B
I2C INTERFACE
DC590B(5V)
EXTVCC
VUNREG
JP8
DATE
Aug 28, 2014
LEO C
1
APPROVED
EXTVCC
2.9V - 5.5V
GND
SDA
SCL
E14
TP2
POWER
R8
14
12
11
9
10
5
7
4
6
2
1
3
2
1
SDA
SCL
TITLE: SCHEMATIC
VSS
Q3
2N7002TA
PWM
GRN
D2
VSS
A2
A1
1
APPROVALS
SDA
SCL
WP
A0
SDA
SCL
330
R6
U2
24LC025-I/ST
VCC
REVISION HISTORY
DESCRIPTION
JP5, JP6, JP7 Shunts move to Low
Replaced LED's
R5
(OPT)
VCC
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
3
2
1
WP
R1
R2
4.99K 4.99K
1%
1%
D1
B
VCC
RED
R4
(OPT)
VCC

ECO REV
2
GND
TEMP
4
GND
13
GND
8
6
3
D
5
A
B
C
D
DEMO MANUAL DC1785B
Schematic Diagram
dc1785bfa
DEMO MANUAL DC1785B
Revision History
REV
DATE
DESCRIPTION
A
10/14
Board revision B, corrected jumper settings (JP5, JP6, JP7)
PAGE NUMBER
1
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DEMO MANUAL DC1785B
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 application engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
dc1785bfa
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Linear Technology Corporation
LT 1014 REV A • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2011
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