DEMO MANUAL DC590B
USB Serial Controller for
Linear Technology
QuikEval Demo Boards
Description
Demonstration circuit 590B is a USB-based controller
with generic serial peripheral interface (SPI) and inter
integrated circuit (I
2
C) ports. It is designed to mate with
Linear Technology’s family of QuikEval™ demonstration
boards. The demo board is fully isolated from the host
PC’s ground, and in many cases no external power source
is required. The evaluation software automatically detects
which demo board is connected and loads the appropriate
control screen.
The QuikEval system provides a quick and easy way to
evaluate the performance of a wide variety of Linear Tech-
nology’s products, including ADCs, DACs, SMBus power
control products and many others.
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 and PScope are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
BoarD photo
DO NOT CONNECT
DEMO CIRCUIT
UNDER EVALUATION
USB CABLE
TO HOST PC
SELECT ISOLATED SUPPLY
VOLTAGE (2.7V, 3.3V, 5.0V,
OR EXTERNAL
CONNECT EXTERNAL 10V TO 12V
SUPPLY ONLY IF JP5, ISO IS SET TO OFF
(SEE TEXT)
CONNECT 2.7 TO 5V LOGIC SUPPLY
ONLY IF VCCIO IS SET TO EXT
(SEE TEXT)
ISOLATED
GROUND
dc590b F01
DO NOT CONNECT
ISOLATED POWER SUPPLY
(SHOWN IN OFF POSITION)
Figure 1. DC590B Connection Diagram
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DEMO MANUAL DC590B
Quick start proceDure
For proper equipment setup, use the following procedure:
1. Do NOT plug in DC590B before running the installa-
tion program.
2. Download the QuikEval installation program from
http://www.linear.com/software/
3. Run the QuikEval installation program and follow the
onscreen instructions.
NOTE: The QuikEval demo software requires a PC
that is running Windows XP (or later), and has an
available USB port.
4. Connect the demonstration circuit to be evaluated to
the DC590B using the supplied 14-conductor ribbon
cable. The demo software detects the circuit and starts
the appropriate control screen.
Each demonstration board also comes with a Quick Start
guide similar to this one. For usage details relevant to a
particular circuit, refer to its Quick Start Guide.
To update the software (requires Internet connection):
n
Choose Update from the Tools menu. This automatically
updates the main program and drivers for individual
demo circuits.
Choose Quick Start Guide from the View menu.
To view the DC590B Demo Manual:
n
dc590B F02
Figure 2. QuikEval Software
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DEMO MANUAL DC590B
connections to the Dc590B
Figure 1 shows the connections to the DC590B. In most
cases, DC590B and the demonstration circuit under evalu-
ation can operate from available USB power, and thus
require nothing more than a USB connection to the host
PC and a ribbon connecting DC590B to the demo circuit
under evaluation. The DC590B offers several other power
options, as described in the following text.
Isolated Supply Options
An LT3439 low noise switching power supply provides
isolated power to the demonstration circuit under evalua-
tion and to the isolation circuitry. This is adequate in many
cases, however an external power supply is recommended
to reduce the load on the host computer’s USB port or to
reduce power supply noise in the circuit under test.
The LT3439 switching power supply is enabled by default
but may be disabled by moving jumper JP5 (ISO, to the
left) to the OFF position. This allows the isolated side of the
board and the demonstration circuit under evaluation to be
powered separately. This is recommended when testing
precision components such as high resolution ADCs and
DACs. After moving JP5 ISO to the OFF position, apply a
clean, regulated power supply from 7V to 10V to the V
+
and AGND turret posts.
Isolated Digital Supply
The signal levels on the digital interface are determined
by the VCCA voltage. The onboard regulator can be set
to 5V, 3.3V and 2.7V, by installing JP6 in the appropriate
position (remove jumper for 2.7V). Selecting EXT shuts
the regulator down, and an external supply between 2.7V
and 5V must be applied to the VCCA turret post.
The +5V turret is the digital supply for the isolated portion
of DC590B. Do not draw current from this point.
LED Indicators
Two LED indicators are provided. The ISO PWR LED is
lit when either the onboard switching power supply is
running or external power is applied to the isolated side
of the board.
The COMMAND LED indicates that a command has been
sent to the board by the host PC and is waiting to be ex-
ecuted. The LED may not appear to be blinking in some
cases, as the duty cycle may be very short.
Jumper Summary
Some jumpers on the DC590B board are for future use
and MUST be left in the default positions.
JUMPER
JP1
POSITION
PROG
FUNCTION
Microcontroller in-circuit programming
header. Do NOT install jumper; make no
connections
Do NOT install jumper;
make no connections
Do NOT install jumper;
make no connections
Jumper MUST be in the EN position
MUST be in the ON Position.
See Connections section.
Controls the isolated supply.
See Connections section.
See Connections section
JP2
JP3
JP4
JP5
MODE
Watchdog Enable
EE
SW
(Right-hand side)
ISO
(Left-hand side)
JP6
VCCA Control
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DEMO MANUAL DC590B
trouBleshooting guiDe
PROBLEM
SOLUTION
The DC590B is plugged in, but the
QuikEval screen still says “USB
Serial Controller Not Connected”
The demo board software loads
properly but will not run, or
displays “Device Not Accessible”
errors
After connecting the demo board to
DC590B with the supplied 14-pin
ribbon cable, QuikEval software still
displays “Evaluation Board is Not
Connected”
The most likely cause is improper installation of the USB drivers, which
causes Windows to recognize DC590B as an “Unknown Device.” Open
the Windows Control Panel, open “System” and click the “Device
Manager” tab. Open the “Other Devices” item and look for USB SERIAL
CONTROLLER. Select this item and click the remove button. Unplug
the DC590B, re-install the QuikEval software, and follow the onscreen
instructions.
Verify that the demo board is properly powered up. This Demo Manual
lists the basic power connections to the DC590B. Some demo boards
may have additional requirements; refer to the demo board’s Quick Start
guide for details.
Contact Linear Technology Applications Engineering.
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DEMO MANUAL DC590B
parts list
ITEM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
QTY
27
1
1
7
1
3
1
1
2
2
7
4
0
1
0
4
REFERENCE
C1-C5, C8-C10, C12-C19,
C23, C26, C27, C30-C37
C6
C7
C11, C21, C24, C38, C40,
C41, C42
C20
C22, C28, C39
C25
C29
C43, C44
D1,D2
E1, E2, E3, E4, E5, E6, E7
JP1, JP2, JP5, JP6
JP3
JP4
JP7
PART DESCRIPTION
CAP., X5R, 0.1µF, 10V, 10%, 0402
CAP., X7R, 2200pF, 100V, 10%, 0402
CAP., NPO, 100pF, 50V, 10%, 0402
CAP., X5R, 10µF, 6.3V, 20%, 0805
CAP., X5R, 100µF, 6.3V, 20%, 1210
CAP., X7R, 0.01µF, 16V, 10%, 0402
CAP., X7R, 330pF, 100V, 10%, 0402
CAP., X7R, 2.2nF, 1000V, 1206
CAP., NPO, 47pF, 50V, 10%, 0402
DIODE, SCHOTTKY, SOT23
TESTPOINT, TURRET, 0.064"
JMP, 2×3, 0.079"
JMP, 3-PIN, 1 ROW, 0.079"
JMP, 3-PIN, 1 ROW, 0.079"
JMP, 2-PIN, 1 ROW, 0.079"
MANUFACTURER/PART NUMBER
AVX, 0402ZD104KAT
AVX, 04025C222KAT2A
AVX, 04025A101KAT2A
TDK, C2012X5R0J106M
TDK, C3225X5R0J107M
AVX, 0402YC103KAT2A
AVX, 04025C331KAT2A
AVX, 1206AC222KAT1A
AVX, 04025A470KAT2A
DIODES INC., BAT54S-7-F
MILL-MAX, 2308-2-00-80-00-00-07-0
SAMTEC, TMM-103-02-L-D
OPT.
SAMTEC, TMM-103-02-L-S
OPT.
SAMTEC, 2SN-BK-G
SHUNTS ON JP4 (1 AND 2), SHUNT, 0.079" CENTER
JP5 (1 AND 3, 2 AND 4), JP6
(3 AND 4)
J1
J2
J3
J4
LED1-LED5
Q1
Q2, Q5
Q4
RSENSE
R1, R49, R57, R64
R2, R11, R12, R13, R20
R3, R8, R9, R21, R27, R28,
R30, R31, R33, R35, R39,
R43-R48, R63, R68
R4, R6, R14, R17, R23,
R24, R29
R5, R15, R16, R18, R19,
R22, R25, R51, R52, R56,
R58, R59, R62
R7
R10, R66
R26
R32
R34, R36, R37, R40
R38
JMP, 2×20, 0.100"
JMP, 2×7, 0.100"
CON, USB-B, 4 PINS, SINGLE THR. HOLE
HEADER, 2×7 PIN, 0.079"
LED, GND, 0603
TRANS, NPN, MMBT3904, SOT23
XSTOR, N-CH, SOT23
MOSFET, N-CH, DS, SOT23
RES., CHIP, 0.1Ω, 1%, 0805
RES., CHIP, 49.9k, 1/16W, 1%, 0402
RES., CHIP, 475, 1/16W, 1%, 0402
RES., CHIP, 10k, 1/16W, 5%, 0402
17
18
19
20
21
22
23
24
25
26
27
28
0
0
1
1
5
1
2
1
1
4
5
19
OPT.
OPT.
MILL-MAX, 897-43-004-90-000
MOLEX, 87831-1420
LITE ON, LTST-C190KGKT
DIODES INC., MMBT3904-7-F
VISHAY, 2N7002-T1-E3
VISHAY, Si2306DS-T1-E3
VISHAY, WSL0805R1000F
AAC, CR05-4992FM
AAC, CR05-4750FM
AAC, CR05-103JM
29
30
7
13
RES., CHIP, 22.1, 1/16W, 1%, 0402
RES., CHIP, 1.5k, 1/16W, 5%, 0402
AAC, CR05-22R1FM
AAC, CR05-152JM
31
32
33
34
35
36
1
2
1
1
4
1
RES., CHIP, 14k, 1/16W, 1%, 0402
RES., CHIP, 102k, 1/16W, 1%, 0402
RES., CHIP, 6.34k, 1/16W, 1%, 0402
RES., CHIP, 2.21k, 1/16W, 1%, 0402
RES., CHIP, 100, 1/16W, 5%, 0402
RES., CHIP, 16.9k, 1/16W, 1%, 0402
AAC, CR05-1402FM
AAC, CR05-1023FM
AAC, CR05-6341FM
AAC, CR05-2211FM
AAC, CR05-101JM
VISHAY, CRCW040216K9FKED
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