MAX1133EVKIT [MAXIM]

Evaluation Kit for the MAX1132/MAX1133 ; 评估板MAX1132 / MAX1133\n


型号：	MAX1133EVKIT
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Evaluation Kit for the MAX1132/MAX1133 评估板MAX1132 / MAX1133\n
文件：	总7页 (文件大小：226K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

19-2161; Rev 0; 09/01

MAX1132 Evaluation Kit

General Description

Features

ꢀ Proven PC Board Layout

The MAX1132 evaluation system (EV system) is a com-

plete, single-channel data-acquisition system, consisting

of a MAX1132 evaluation kit (EV kit) and a Maxim

68HC16MODULE-DIP microcontroller (µC) module. The

MAX1132 is a high-speed, single-channel, 16-bit data

acquisition system. Windows^®95/98 software provides a

handy user interface to exercise the MAX1132’s features.

Order the complete EV System (MAX1132EVC16) for

comprehensive evaluation of the MAX1132 using a PC.

Order the EV kit (MAX1132EVKIT) if the 68HC16MOD-

ULE-DIP module has already been purchased with a pre-

vious Maxim EV system, or for custom use in other µC-

based systems.

ꢀ Complete Evaluation System

ꢀ Convenient Test Points Provided On-Board

ꢀ Data-Logging Software

ꢀ Fully Assembled and Tested

Ordering Information

The MAX1132 software is designed for use with the com-

plete EV system MAX1132EVC16 (includes 68HC16-

MODULE-DIP module together with MAX1132 EVKIT). If

the MAX1132 evaluation software is not used, the

MAX1132EVKIT board can be purchased by itself, with-

out the µC.

PART

TEMP. RANGE

INTERFACE TYPE

MAX1132EVKIT

0°C to +70°C

User supplied

MAX1132EVC16

0°C to +70°C

Windows software

MAX1132EVKIT Parts List

REFERENCE QTY

DESCRIPTION

C1, C2

10µF 10V B-size tantalum capacitors

MAX1132EVC16 System

Component List

2.2µF 10V X7R ceramic capacitor

0.22µF X7R ceramic capacitor (1206)

0.1µF X7R ceramic capacitors (1206)

1µF X7R ceramic capacitor (1206)

Ferrite beads

C5, C6, C8

PART

QTY

DESCRIPTION

MAX1132 EV kit

68HC16 µC module

MAX1132EVKIT

FB1, FB2

68HC16MODULE-DIP

2 x 20 right-angle socket,

SamTec SSW-120-02-S-D-RA

JU1, JU5

JU2, JU3, JU4

3-pin headers

2-pin headers

100k

1ꢀ 1206 resistor

List of Files in MAX1132

EV Kit

TB1, TB2

TP1

0.200in screw terminal blocks

9-pin header

MAX1132BCAP

FILE

DESCRIPTION

Installs the EV kit files on computer

Application program

74HC04 (14-pin SO) hex inverter

PC board, MAX1132 EV kit

3.5in software disk, MAX1132 EV kit

INSTALL.EXE

MAX1132.EXE

KIT1132.C16

None

Software loaded into 68HC16 µC

MAX1132 EV kit data sheet

(includes 68HC16MODULE-DIP

manual)

None

Windows is a registered trademark of Microsoft Corp.

MAX1132 data sheet

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

MAX1132 Evaluation Kit

5) Install the MAX1132 EV kit software on your com-

puter by running the INSTALL.EXE program on the

floppy disk. The program files are copied and icons

are created for them in the Windows Start menu.

MAX1132 Stand-Alone EV Kit

The MAX1132EVKIT provides a proven PC board layout

to facilitate evaluation of the MAX1132. It must be inter-

faced to appropriate timing signals for proper opera-

6) Start the MAX1132 program by opening its icon in

the Start menu.

tion. Connect +5V to AV

and connect ground return

to AGND (Figure 1). Refer to the MAX1132 data sheet

for timing requirements.

7) The program prompts you to connect the µC mod-

ule and turn its power on. Slide SW1 to the ON posi-

tion. Select the correct serial port and click OK. The

program automatically downloads KIT1132.C16 to

the module.

MAX1132 EV System

The MAX1132EVC16 EV system operates from a user-

supplied +7VDC to +20VDC power supply. Windows

95/98 software running on an IBM PC interfaces to the

EV system board through the computer’s serial commu-

nications port. See the Quick Start section for setup and

operating instructions.

8) Apply the input signal across the pins of JU2.

Observe the readout on the screen.

Detailed Description

of Software

Quick Start

The evaluation software main window controls the

active control word bits, serial clock speed, and sample

rate. It displays the voltage and output code, as well as

some statistics of the input signal. A separate graph

window shows the data changing in real time. The

update rate is limited to about 10 samples per second,

due to COM port bandwidth limitations.

Recommended Equipment

Before you begin, the following equipment is needed:

•

MAX1132EVC16 (contains MAX1132EVKIT board

and 68HC16MODULE-DIP)

Small DC power supply, such as a 12VDC 0.25A

plug-in transformer, or a +9V battery

IBM PC-compatible computer running Windows

95/98

Controls

The control word is divided into several fields. To

change the active control word, drop down the appro-

priate field’s combo box and select the desired option.

If the QSPI clock is set to STOP, the configuration data

is not sent until the READ button is clicked.

Spare serial communications port, preferably a

9-pin plug

Serial cable to connect the computer’s serial port to

the 68HC16MODULE-DIP

Statistics

The minimum and maximum fields show the lowest and

highest readings acquired. The average and RMS

fields show the running mean and root-mean-square of

the input signal. The Clear button resets the statistics.

To remove offset errors, first apply zero volts to the

active input channel, clear statistics, acquire some

samples, and then check Tare. This offset is now sub-

tracted from all subsequent voltage measurements.

1) Carefully connect the boards by aligning the 40-pin

header of the MAX1132 EV kit with the 40-pin con-

nector of the 68HC16MODULE-DIP module. Gently

press them together. The two boards should be

flush against one another.

2) Check the jumper settings (Table 1).

3) Connect a +7VDC to +20VDC power source to the

µC module at the terminal block located next to the

on/off switch, along the top edge of the µC module.

Observe the polarity marked on the board.

Sampling

To sample data at rates up to 125ksps, select the

Sample menu item, make your selections, and click the

Begin Sampling button. Sample size is restricted to a

power of two to permit FFT processing once the data is

saved to a file. After the samples have been collected,

the data is automatically uploaded to the host and is

graphed. Once displayed, the data can optionally be

saved to a file.

4) Connect a cable from the computer’s serial port to

the µC module. If using a 9-pin serial port, use a

straight-through, 9-pin female-to-male cable. If the

only available serial port uses a 25-pin connector, a

standard 25-pin to 9-pin adapter is required. The

EV kit software checks the modem status lines

(CTS, DSR, DCD) to confirm that the correct port

has been selected.

_______________________________________________________________________________________

MAX1132 Evaluation Kit

Saving Graphs to Disk

Data in the real-time graph and in sampled data graphs

may be saved to a file. Only the raw output codes are

saved, but voltages may be inferred based on the ref-

erence voltage and the maximum code value.

Detailed Description

of Hardware

The MAX1132 (U1) is a high-speed, single-channel, 16-

bit data-acquisition system. There is no antialiasing filter

provided. The input signal may be applied directly to

JU2. High-impedance signal sources may require an

input buffer, which may be installed in the prototype

area. C4 bypasses the bandgap reference, and C3

bypasses the A/D converter‘s voltage reference. When

Evaluating Shutdown

The evaluation software configures the 68HC16’s QSPI

submodule to continuously read data from the MAX1132

into the 68HC16. The sample rate is controlled by the

QSPI clock. To evaluate power-saving modes, these

automatic updates must be stopped. First, set the QSPI

clock control to STOP. This reconfigures the 68HC16’s

QSPI submodule to stop driving the serial clock. Second,

in the evaluation software’s main window, uncheck the

Read Every checkbox. Next, choose the desired software

power-down control word, and click the Read button to

send the new configuration to the MAX1132. If evaluating

the hardware shutdown, move JU2 to the 2-3 position.

plugged into the 68HC16MODULE, the AV

and DV

circuits are both powered by +5V. (Figure 1). Refer to the

MAX1132 data sheet.

Evaluating the MAX1133

To change the evaluation software's full-scale voltage

for use with the MAX1133, type 4.096 into the full-scale

edit box and click the Set V

button.

REF

Troubleshooting

Problem: No output measurement. System seems to

report zero voltage, or fails to make a measurement.

Reference Voltage

The evaluation software assumes a +4.096V reference

voltage and a +12V full-scale voltage, unless otherwise

specified. Refer to the MAX1132 data sheet for more

information. To override these values, type the new val-

Check V

and V

supply voltages. Check the

LOGIC

+4.096V reference voltage using a digital voltmeter.

Use an oscilloscope to verify that the conversion-start

signal is being strobed. Verify that SHDN is being dri-

ven high.

ues into the appropriate edit box and click the Set V

button.

REF

Table 1. Jumper Functions

JUMPER

—

POSITION

1-2

FUNCTION

Operate

JU1

—

Open

2-3

SHDN is controlled by 68HC16 module

Shutdown

JU2

—

Closed

Open

Closed

Open*

Closed

Open*

Measure short circuit (zero volts)

Apply input signal at JU2

Illegal

JU3

—

Enable internal reference, or apply an external reference

Disable internal reference

JU4

—

Enable internal reference

—

User-programmable output pin P2

User-programmable output pin P1

User-programmable output pin P0

JU5

—

*Default configuration

_______________________________________________________________________________________

MAX1132 Evaluation Kit

U2-C

74HC04

U2-D

DVDD

AVDD

FB2

JU3

JU4

AIN

J1-7

J1-8

REF

74HC04

U2-F

10 F

10V

2.2 F

10V

JU2

AVDD

AGND

CREF

REFADJ

AGND

74HC04

U2-G

TP1-1

AVDD

10 F

10V

0.22 F

1.0 F

TB1

FB1

TP1-4

TP1-5

74HC04

DVDD

J1-1

J1-2

J1-38

J1-36

0.1 F

MAX1132

J1-3

DIN

0.1 F

DGND

DVDD

TP1-2 DVDD

J1-4

JU1

0.1 F

DGND

SCLK

J1-29

SHDN

TP1-2

TP1-6

DVDD

J1-37

J1-31

JU5

TB2

DVDD

100k

TP1-7

TP1-3

RST

SSTRB

J1-27

U2-A

U2-B

TP1-8

J1-35

NOTES:

1. MINIMIZE PARASITIC CAPACITANCE OF U1 PIN 11–U2 PIN 1.

KEEP THE TRACE SHORT AND KEEP GROUND PLANE 0.025in AWAY.

DOUT

74HC04

2. U2 SUPPLY AND GROUND RETURN SHOULD BE ROUTED TO CONNECTOR J1, NOT FLOODED.

Figure 1. MAX1132 EV Kit Schematic Diagram

Problem: Unacceptable errors when measuring a

transducer.

Problem: Measurements are erratic, unstable; poor

accuracy.

Although most signal sources can be connected direct-

ly to the MAX1132’s analog input, some high-imped-

ance signal sources may require an input buffer. Check

for settling errors by increasing the acquisition time:

operate the evaluation kit in external clock mode, 32

clocks per conversion, with the QSPI clock at its slow-

est setting.

Check the reference voltage and input using a digital

voltmeter. Use an oscilloscope to check for noise.

When probing for noise, keep the oscilloscope ground

return lead as short as possible, preferably less than

1/2in (10mm).

_______________________________________________________________________________________

MAX1132 Evaluation Kit

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Listing 1. Reading All Channels with QSPI

_______________________________________________________________________________________

MAX1132 Evaluation Kit

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Listing 2. Reading a Single Channel with QSPI

_______________________________________________________________________________________

MAX1132 Evaluation Kit

1.0"

Figure 2. MAX1132 EV Kit Component Placement Guide —

Component Side

Figure 3. MAX1132 EV Kit PC Board Layout—Component Side

1.0"

Figure 4. MAX1132 EV Kit PC Board Layout—Solder Side

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7

Printed USA

is a registered trademark of Maxim Integrated Products.

MAX1133EVKIT [MAXIM]

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