DEMO MANUAL DC1338B
LTC2990 I
2
C Temperature
Voltage and Current Monitor
DESCRIPTION
Demonstration circuit 1338B features the LTC
®
2990, a
high performance temperature, voltage and current moni-
tor that uses I
2
C for communication. It offers submillivolt
resolution and 1% current and 1°C temperature measure-
ment accuracy.
DC1338B is a member of Linear Technology’s QuikEval™
family of demonstration boards. It is designed to allow easy
evaluation of the LTC2990 and may be connected directly
to the target application’s analog signals while using the
DC590 USB Serial Controller board and supplied software
to measure performance. Exposed ground planes allow
proper grounding to prototype circuitry. After evaluating
with Linear Technology’s software, the I
2
C lines can be
connected to the end application’s processor/controller
for development of the serial interface.
Design files for this circuit board are available at
http://www.linear.com/demo
L,
LT, LTC, LTM, 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 Setup.
Power Is Obtained from DC590
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DEMO MANUAL DC1338B
QUICK START PROCEDURE
Connect DC1338B to a DC590 USB serial controller using
the supplied 14 conductor ribbon cable. Connect DC590
to host PC with a standard USB A/B cable. Run the evalu-
ation 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 (COLLECT button becomes
PAUSE after collection has been initiated). Details on
software features are documented in the control panel’s
help menu.
Figure 2. Software Screenshot
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DEMO MANUAL DC1338B
HARDWARE SETUP
Connection to DC590 Serial Controller
J1 is the power and digital interface connector. Connect
to DC590 serial controller with supplied 14 conductor
ribbon cable.
Jumper Settings
V1, V2, V3, V4:
These jumpers can be toggled between
VOLT and TEMP. VOLT connects the corresponding input
on the LTC2990 with the corresponding turret for an exter-
nal input. TEMP connects the corresponding input to the
onboard FMMT3904 (V3 and V4) or the FMMT3906 (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 V3 and V4 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 box to reflect any changes made.
V
CC
:
EXT allows the LTC2990 to be powered from an ex-
ternal supply of 2.9V to 5.5V, connected to the VCC EXT
and GND turrets. If set to INT, the LTC2990 is powered
by the attached DC590.
ADR0, ADR1:
These jumpers are used to select the I
2
C
address for the LTC2990. When used with QuikEval, the
correct address should also be selected from within the
software.
Analog Connections
Analog signal connections are made at turrets V1, V2, V3
and V4. Single-ended input range is 0 to V
CC
, differential
is ±300mV with a common mode range of 0 to V
CC
. 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.
GND (2 locations):
This turret is connected directly to the
internal ground planes.
VCC EXT:
This turret allows the user to provide V
CC
to the
LTC2990. (2.9V to 5.5V)
V1, V2, V3, V4:
These turrets are used to provide input
voltage to the monitor when the corresponding jumpers
are set to the VOLT position.
V
+
:
Unregulated 10V coming from the DC590. Turret pro-
vided for testing purposes only. Presence of 10V indicates
proper connection of DC590.
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DEMO MANUAL DC1338B
PARTS LIST
ITEM
1
2
3
4
5
6
7
8
9
10
11
QUANTITY
2
2
8
7
1
1
1
2
1
1
7
REFERENCE DESIGNATOR
C2, C1
C4, C3
E1, E2, E3, E4, E5, E6, E7, E8
JP1, JP2, JP3, JP4, JP5,
JP6, JP7
J1
Q1
Q2
R1, R2
U1
U2
XJP1, XJP2 ,XJP3, XJP4,
XJP5 TO XJP7
DESCRIPTION
CAP X7R 0.1μF 25V 10%
,
CAP NPO 470pF 25V 10%
,
TURRET, TESTPOINT
HEADERS, 3 PINS 2mm CTRS
HEADERS, 14PIN 2mm CTRS
TRANSISTOR, PNP
TRANSISTOR, NPN
RES, CHIP 4.99k 0.06W 1%
IC, TEMP VOLT, CURR MONITOR
,
IC, SERIAL EEPROM
SHUNT, 2mm CTRS
MANUFACTURER’S PART NUMBER
AVX, 06033C104KAT2A
AVX, 06033A471KAT2A
MILL MAX, 2308-2-00-80-00-00-07-0
SAMTEC, TMM-103-02-L-S
MOLEX, 87831-1420
ZETEX, FMMT3906
ZETEX, FMMT3904
VISHAY, CRCW04024K99FKED
LINEAR TECHNOLOGY, LTC2990CMS
MICROCHIP 24LC025-I/ST
,
SAMTEC, 2SN-BK-G
Required Circuit Components:
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5
4
3
2
1
REVISION HISTORY
ECO
DESCRIPTION
REV
APPROVED
DATE
ADR1
D
1
2
2
1
VCC
EXT
3V - 5.5V
E2
GND
1
E1
VCC
EXT
D
0
INT
JP2
JP1
3
3
V1
ADR0
E3
TEMP
1
2
1
2
C3
470pF
1
V+
J1
VUNREG
SCL
SDA
TP1
TP2
+5V
SCHEMATIC DIAGRAM
VOLT
3
JP3
0
JP4
Q1
FMMT3906
3
1
2
3
E4
V1
V2
C
TEMP
1
1
V1
SCL
2
V2
ADR0
ADR1
VCC
4
V4
GND
5
0.1uF
SCK/SCL
4
5
6
7
8
EESDA
C
2
SDA
7
8
9
10
C1
6
VOLT
3
JP5
E5
V2
3
V3
9
EEVCC
EESCL
EEGND
V3
TEMP
1
10
11
12
U2
24LC025-I/ST
2
VOLT
Q2
FMMT3904
R1
3
JP6
13
8
7
6
5
VCC
WP
SCL
SDA
A0
A1
A2
VSS
1
2
3
4
B
E6
V3
C4
470pF
14
B
V4
TEMP
1
2
VOLT
3
4.99K
1%
R2
4.99K
1%
JP7
E7
V4
C2
0.1uF
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.
E8
GND
CUSTOMER NOTICE
APPROVALS
TECHNOLOGY
Leo C.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
A
A
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.
C:\PADS PROJECTS\1338B\SCH\1338B_REV1.DSN
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
4
3
SIZE
IC NO.
N/A
SCALE = NONE
DATE:
2
LTC2990CMS
DEMO CIRCUIT 1338B
February 16, 2012
1
REV.
1
SHEET 1
OF 1
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DEMO MANUAL DC1338B
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