LINEAR DC590A-1

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 590
USB SERIAL CONTROLLER FOR LINEAR TECHNOLOGY QUICKEVAL™ DEMO BOARDS
DESCRIPTION
Demonstration circuit 590 is a USB-based digital controller with generic Serial Peripheral Interface (SPI) and
Inter Integrated Circuit (I2C™) ports. It is designed to
mate with Linear Technology’s family of QuickEval™
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.
Figure 1 shows a block diagram of DC590. Power and
digital signal connections are made via a 14-conductor
ribbon cable. In many cases the controller can provide
power for the demonstration circuit as well as digital
signals. The demonstration circuit connections are fully
isolated from the host PC’s ground (earth ground.) Four
of the fourteen ribbon-cable conductors are referred to
earth ground. Thus the isolation barrier is not designed
to withstand large potential differences.
This system facilitates quick performance evaluation of a
variety of products, including ADCs, DACs, SMBus
power control products, and others.
QuickEval is a trademark of Linear Technology Corporation; I C is a trademark of
Philips Electronics N.V.; Adobe is a trademark of Adobe Systems, Inc.
2
DATA ISOLATION
(AGILENT HCPL-2300)
USB
PORT
DATA
I/O
USB TO
I2C/SPI
CONTROLLER
v+
POWER
MANAGEMENT
AUXILIARY
BOARD ID LINES
14-PIN CONNECTOR
4
LT1761
vcc
5V
EXTERNAL
POWER
SWITCHER
SHUTDOWN
(JP1)
GND
Figure 1. Block Diagram of Demonstration Circuit 590
1
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 590
USB SERIAL CONTROLLER FOR LINEAR TECHNOLOGY QUICKEVAL™ DEMO BOARDS
Figure 2. Basic Connection
QUICK START PROCEDURE
For proper equipment setup, follow the procedure below:
1. Do not plug in DC590 before running the installation
program.
2. Download the QuickEval installation program from
http://www.linear.com/software/.
3. Run the QuickEval installation program and follow the
on-screen instructions.
NOTE: The QuickEval demo software requires a PC that
is running Windows 98 (or later), and has an available
USB port.
4. Connect the demonstration circuit to be evaluated to
DC590 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.
2
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 590
USB SERIAL CONTROLLER FOR LINEAR TECHNOLOGY QUICKEVAL™ DEMO BOARDS
USEFUL SOFTWARE TOOLS
The QuickEval Demo software includes tools for automatic software updates and for quickly retrieving relevant documentation from the World Wide Web.
The Download Datasheets feature is particularly useful
to laptop users, who can use this feature to download
the data sheets and Quick Start guides in one step, thus
making them available even when the laptop is not connected to the internet.
NOTE: Adobe Acrobat reader is required to view the
documents and is available at http://www.adobe.com.
To use the tools:
‰ Quit the demonstration circuit software or disconnect
the USB cable.
The main control panel appears.
To update the software (requires internet connection):
‰ Choose Update from the Tools menu.
This automatically updates the main program and
drivers for individual demo circuits.
To view the Quick Start Guide:
‰ Choose Quick Start Guide from the Tools menu.
To retrieve data sheets (requires internet connection):
‰ Choose Download Datasheets from the Tools menu.
All datasheets and Quick Start guides for all products
in the QuickEval family are downloaded to the
QuickEval program folder and placed in the dsheets
folder.
OPTIONAL CONNECTIONS TO THE DC590
In most cases DC590 and the demonstration circuit under evaluation can operate from available USB power,
and thus require nothing more than a USB connection to
the host PC and a ribbon connecting DC590 to the demo
circuit under evaluation. Figure 2 shows this basic
connection.
DC590 offers several other power options, described
below.
Isolated supply options
An external power supply is recommended to reduce the
load on the host computer’s USB port, especially in the
event of faults or short circuits.
An LT1425 switching power supply provides isolated
power to the demonstration circuit under evaluation and
to the isolation circuitry.
The LT1425 switching power supply is enabled by default but may be disabled by moving jumper JP1 (ISOL
PWR) to the OFF position. This allows the isolated side
3
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 590
USB SERIAL CONTROLLER FOR LINEAR TECHNOLOGY QUICKEVAL™ DEMO BOARDS
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.
Figure 3 shows how to connect an external supply to the
isolated side of the controller and the board under
evaluation. After disabling the switching supply, apply
7V–9V between the GND and V+ posts. These posts are
the in, out, and ground terminals of an LT1761 LDO
regulator. The demonstration circuit under evaluation
may draw up to 100mA from VCC.
7V
REGULATED
SUPPLY
DEMONSTRATION
CIRCUIT
UNDER
EVALUATION
USB CABLE
TO HOST PC
14-CONDUCTOR
RIBBON
CABLE
Figure 3. Connecting an external supply to the isolated side of the controller
Another option is to supply power to the isolated side of
the controller (see Figure 4) back through the board under evaluation. The LT1761 regulator is reverse-current
protected. This allows any convenient 5V ±10% regu-
lated supply to be used. In this case, the isolation circuitry on DC590 is also powered from this source.
worst-case current draw by DC590 is 50mA.
5V
REGULATED
SUPPLY
DEMONSTRATION
CIRCUIT
UNDER
EVALUATION
USB CABLE
TO HOST PC
14-CONDUCTOR
RIBBON
CABLE
Figure 4. Supplying power to the controller through the board under evaluation
4
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 590
USB SERIAL CONTROLLER FOR LINEAR TECHNOLOGY QUICKEVAL™ DEMO BOARDS
LED INDICATORS
Two LED indicators are provided. The “ISOL 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 executed. The LED may not appear to be blinking in
some cases, as the duty cycle may be very short.
CIRCUIT DETAILS
Schematics for the isolated power supply and optical
signal isolation are attached to the end of this Quick
Start Guide. Example microcontroller code is devicespecific, and may be included in the Quick Start Guide
for the demonstration circuit under evaluation.
OPTICAL ISOLATION
The optical isolation scheme based on the Agilent HCPL
2300 high speed opto isolator and is designed to allow
bidirectional SPI and I2C communications. Isolation
schemes that are designed for only SPI or I2C will differ
slightly. Contact Linear Technology Applications Engineering for more information.
SWITCHING POWER SUPPLY
The onboard switching supply is based on the LT1425
flyback regulator. Feedback is taken from the primary
side of T1, eliminating the need for optical feedback. T2
and C9 provide common mode filtering. Refer to the
LT1425 data sheet for details of operation.
TROUBLESHOOTING GUIDE
Problem: DC590 is plugged in, but QuickEval screen
still says “USB Serial Controller Not Connected”
Solution: The most likely cause is improper installation of the USB drivers, which causes Windows to recognize DC590 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 DC590, Re-install the
QuickEval software, and follow the on-screen instructions.
Solution: Verify that the demo board is properly
powered up. This Quick Start Guide lists the basic power
connections to DC590. Some demo boards may have
additional requirements; refer to the demo board’s Quick
Start guide for details.
Problem: After connecting the demo board to DC590
with the supplied 14 pin ribbon cable, QuickEval software still displays “Evaluation Board is not Connected.”
Solution: Contact Linear Technology Applications
Engineering.
Problem: Demo board software loads properly, but will
not run or gives “Device Not accessible” errors.
5
4
3
VCC
D
R6
20K
R13
2K
ISO_PWR_SHDN/
C1
220PF
ON
2
R4
75
1
OFF
C7
R7
1000PF 3.01K
1
GND
2
NC
3
4
RFB ROCOMP 14
VC RCCOMP 13
5
RREF
6
SYNC
7
SGND PGND 10
GND 9
GND
8
3
C6
220PF
U2
C
+
-
E4
VIN
3
2
3
1
1
1
C2
2.2,16V
1206
2
VIN 12
VSW 11
2
2
3
T2
CTX8-1P
4
3
C3
4.7,16V
1206
C8
0.1
IN
VCCA
OUT 5
GND
BYP 4
SHDN
LT1761ES5-5
C5
2.2,16V
1206
E1
5V
R2
1.5K
ISOL PWR
R5
100K
LED1
LN1351C
GREEN
E2
GND
ISOLATED SECTION
U3
LT1129CST-5
4
D6
ZHCS1000
1
3
VIN
1
IN
C10
0.1
B
VCC
GND
OUT 3
GND
C11
22,6.3V
1210
2
PLACE CLOSE TO
LT1425CS
NOTES: UNLESS OTHERWISE SPECIFIED
7-12V
USBVCC
U4
1 VIN SENSE 6
2 GND GATE 5
3 CTL
STAT 4
LTC4412ES6
Q1
FDN306P
VCC
2
1. ALL RESISTORS ARE IN OHMS, 0603.
ALL CAPACITORS ARE IN MICROFARADS, 0603.
USBVCC
2. INSTALL SHUNT ON JP1 PIN 2 AND 3.
3
CONTRACT NO.
APPROVALS
DRAWN:
A
TECHNOLOGY
KIM T.
CHECKED:
TITLE:
APPROVED:
ENGINEER: MARK T.
DESIGNER:
SIZE
A
DATE:
5
C4
OPT
R8
15K
C9
0.1,50V
0805
R9
10K
E5
GND
U1
D
C
1
B
ISO_PWR
GND 16
SHDN 15
LT1425CS
J1
CUI, PJ-002A
WALL ADAPTER INPUT
1
E3
7V
1
3
T1
CTX02-13483
4
R3
17.8K
1
1
R1
75
D1
ZHCS1000
VCC
JP1
ISOL PWR
2
2
5
4
3
2
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
USB SERIAL CONTROLLER
DWG NO.
REV
DC590A-1
A
Wednesday, December 18, 2002
SHEET
1
1 OF 3
A
5
4
3
R22 VCCA
2K
2
U8
ISOLATED SECTION
8
VCC
7
RL
6
VOUT CATHODE 3
GND
NC 4
5
D
VCC
R23
4.99K,1%
SCK
R24
4.99K,1%
D
NOTES: UNLESS OTHERWISE SPECIFIED
R25
OPT
EESDA
ISO_PWR
R26 VCCA
4.99K,1%
VCCA
1
2
2
3
3
4
4
ISO_SCL
5
5
ISO_MISO
6
6
ISO_CS/
7
7
ISO_SDA/MOSI
8
8
VCC
9
9
10
10
11
11
12
12
13
13
14
14
1. ALL RESISTORS ARE IN OHMS, 0603.
ALL CAPACITORS ARE IN MICROFARADS, 0603.
U9
J4
C
NC 1
ANODE 2
HCPL-2300
EESCK
1
1
8
VCC
7
RL
6
VOUT CATHODE 3
GND
NC 4
5
NC 1
ANODE 2
VCC
R27
4.99K,1%
CS/
VCC
VCC
C17
0.1
HCPL-2300
R28
OPT
C18
0.1
C
MOSI
R29
OPT
EESDA
VCCA
U10
EESCK
VCCA
R30
R31
49.9K 49.9K
1%
1%
R32
169
R35
2K
8
VCC
7
RL
6
VOUT CATHODE 3
GND
NC 4
5
NC 1
ANODE 2
VCC
R33
4.99K,1%
D3
BAT54A
3
4
V+
1
5
OUT
+IN 3
V- 2
6
SHDN
-IN 1
VCCA
R39
11.5K
TP1
R42
1K
3
2
1
U12
VCCA
U13
D4
BAT54A
V-
V+ 4
OUT 5
2
-IN
SHDN 6
1
+IN
VCCA 1
3
R40
4.99K,1%
LT1719CS6
VCC
VCC 8
RL 7
NC
2
ANODE
3
CATHODE VOUT 6
NC
GND 5
4
R34
11.5K
TP2
R36
1K
LT1719CS6
R37
OPT
B
VCC
2
HCPL-2300
HD2X7-079-MOLEX
U11
VCC
SPI_I2C/
VCC
B
R38
2K
R41
169
SDA
HCPL-2300
R43
OPT
MISO
VCCA VCCA VCCA VCCA VCCA
C19
0.1
C20
0.1
C21
0.1
C22
0.1
C23
0.1
VCCA
A
1
1
JP6
OPT
1
JP7
OPT
JP8
OPT
2
JP3
OPT
1
2
JP4
OPT
1
2
JP5
OPT
1
2
CONTRACT NO.
APPROVALS
DRAWN:
TECHNOLOGY
KIM T.
CHECKED:
TITLE:
APPROVED:
DESIGNER:
2
2
1
ENGINEER: MARK T.
VCC
2
JP2
OPT
SIZE
A
DATE:
5
4
3
2
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
USB SERIAL CONTROLLER
DWG NO.
REV
DC590A-1
A
Wednesday, December 18, 2002
SHEET
1
3 OF 3
A
BILL OF MATERIALS
DC590A-1
QTY-525
Linear Technology Corporation
USB SERIAL CONTROLLER
ENG: MARK THOREN (25-30)
11/9/2004 11:18 AM
Item Qty Reference
1
2 C1,C6
2
2 C2,C5
3
1 C3
4
0 C4
5
2 C7,C25
6
14 C8,C10,C12-C15,C17-C24
7
1 C9
8
1 C11
9
1 C16
10
2 D1,D6
11
4 D2,D3,D4,D5
12
5 E1,E2,E3,E4,E5
13
1 JP1
14
1 SHUNTS FOR JP1
15
0 JP2-JP8
16
1 J1
17
1 J2
18
1 J3
19
1 J4
20
2 LED1,LED2
21
1 Q1
22
1 Q2
23
3 RN1,RN2,RN3
24
2 R1,R4
25
3 R2,R14,R19
26
1 R3
27
2 R5,R18
28
1 R6
29
1 R7
30
1 R8
31
7 R9,R11,R21,R44,R47,R48,R49
32
5 R10,R36,R42,R45,R46
33
1 R12
34
4 R13,R22,R35,R38
35
2 R16,R17
36
1 R20
37
6 R23,R24,R26,R27,R33,R40
Part Description
CAP., NPO 220PF 50V 10%
CAP., X5R 2.2UF 16V 10%
CAP., X7R 4.7UF 16V, 20%, 1206
CAP., 0603
CAP., X7R 1000PF 100V 10%
CAP., X7R 0.1UF 16V 10%
CAP., X7R 0.1UF 50V 10%
CAP., X7R 22UF 6.3V, 20%, 1210
CAP., X7R 0.01UF 100V 10%
DIODE, SCHOTTKY BAT,SOT23
DIODE,SCHOTTKY, SOT23
TESTPOINT, TURRET, 0.064"
JMP, 3PIN 1 ROW .079CC
SHUNT, .079" CENTER
JMP, 2PIN 1 ROW .100CC
CONN, DC PWR JACK,2.00mm
CON, USB-B, 4 PINS, SINGLE THR. HOLE
HEADER, 2X3PIN, 0.079CC
HEADER, 2X7PIN, 0.079CC
LED, GREEN, 1206
MOSFET, P-CH, SOT3
TRANS, NPN, MMBT3904, SOT23
RES, 2X4 ARRAY, 330 OHM, CONVEX-SQ
RES., Chip 75 1/16W 5%,0603
RES., Chip 1.5K 1/16W 5%,0603
RES., Chip 17.8K 1/16W 1%,0603
RES., Chip 100K 1/16W 1%,0603
RES., Chip 20K 1/16W 5%,0603
RES., Chip 3.01K 1/16W 1%,0603
RES., Chip 15K 1/16W 1%,0603
RES., Chip 10K 1/16W 1% ,0603
RES., Chip 1K 1/16W 5%,0603
RES., Chip 470 1/16W 5%,0603
RES., Chip 2K 1/16W 5%,0603
RES., Chip 10 1/16W 5%,0603
RES., Chip 2.2K 1/16W 5%,0603
RES., Chip 4.99K 1/16W 1%,0603
Page 1 - of - 2
Manufacture / Part #
AVX, 06035A221KAT1A
AVX, 1206YC225KAT1A
TAIYO YUDEN, EMK316BJ475MLT
OPT
AVX, 06035C102KAT1A
AVX, 0603YC104KAT1A
AVX, 08055C104KAT1A
TAIYO YUDEN, JMK325BJ226MMT
AVX, 06031C103KAT1A
ZETEX, ZHCS1000
DIODES INC., BAT54A-7
MILL-MAX, 2308-2
COMM-CON, 2802S-03-G1
COMM-CON CCIJ2MM-138G
COMM-CON, 3801S-02-G1
CUI-STACK, PJ-002A
MILL-MAX, 897-30-004-90-000
COMM CON, 2202S-06G2
MOLEX, 87331-1420
PANASONIC, LN1351C-(TR)
FAIRCHILD SEMI., FDN306P
DIODES, MMBT3904
AAC, CRN16-4V-331JCM
AAC, CR16-750JM
AAC, CR16-152JM
AAC, CR16-1782FM
AAC, CR16-1003FM
AAC, CR16-203JM
AAC, CR16-3011FM
AAC, CR16-1502FM
AAC, CR16-1002FM
AAC, CR16-102JM
AAC, CR16-471JM
AAC, CR16-202JM
AAC, CR16-100JM
AAC, CR16-222JM
AAC, CR16-4992FM
BILL OF MATERIALS
DC590A-1
QTY-525
Linear Technology Corporation
USB SERIAL CONTROLLER
ENG: MARK THOREN (25-30)
11/9/2004 11:18 AM
Item Qty Reference
38
0 R25,R28,R29,R37,R43
39
2 R30,R31
40
2 R32,R41
41
2 R34,R39
42
1 SW1
43
0 TP1,TP2,TP3
44
1 T1
45
1 T2
46
1 U1
47
1 U2
48
1 U3
49
1 U4
50
1 U5
51
1 U6
52
1 U7
53
4 U8,U9,U10,U12
54
2 U11,U13
55
1 U14
56
1 Y1
57
1 Y2
Part Description
RES., 0603
RES., Chip 49.9K 1/16W 1%,0603
RES., Chip 169 1/16W 1%,0603
RES., Chip 11.5K 1/16W 1%,0603
SWITCH, LIGHT TOUCH, 2 PINS
TP, .070" SMT
TRANSFORMER, OCTA-PAC
TRANSFORMER, OCTA-PAC
I.C., LT1761ES5-5, SOT23-5
I.C., LT1425CS, SO16
I.C., LT1129CST-5, SOT223
I.C., LTC4412ES6, SOT23-6
I.C., PIC16F76, SSOP28G
I.C., FT245BM, LQFP32
I.C., 93C46BSM, SO8
I.C., HCPL-2300, DIP8
I.C., LT1719CS6, SOT23-6
I.C., NL17SZ74US, US8
RESONATOR, 10MHz, Y-PANA-EFOMC
RESONATOR, 6MHz, CSTLS6M00G
NOTES: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE IN OHMS.
2. INSTALL SHUNT ON JP1 PIN 2 AND 3.
Page 2 - of - 2
Manufacture / Part #
OPT
AAC, CR16-4992FM
AAC, CR16-1690FM
AAC, CR16-1152FM
PANASONIC, EVQPPDA25
OPT
COILTRONICS, CTX02-13483
COINTRONICS, CTX8-1
LINEAR TECH., LT1761ES5-5
LINEAR TECH., LT1425CS
LINEAR TECH., LT1129CST-5
LINEAR TECH., LTC4412ES6
MICROCHIP, PIC16F76
FUTURE TECH., FT245BM
MICROCHIP, 93C46BSM
AGILENT TECH., HCPL-2300
LINEAR TECH., LT1719CS6
ON SEMI., NL17SZ74US
PANASONICS, EFOMC1005T4
MURATA, CSTLS6M00G