Maxim USBTO232 Betriebsanweisung PDF herunterladen (Seite 3)

Evaluate: MAX1162/MAX1062

MAX1162 Evaluation System/Evaluation Kit

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2) Install the MAX1162 EV kit software on your com-

puter by running the INSTALL.EXE program. The

program files are copied and icons are created for

them in the Windows Start | Programs menu.

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

connector of the MAX1162 EV kit with the 40-pin

header of the 68HC16MODULE-DIP module. Gently

press them together. The two boards should be

flush against one another.

4) Ensure that the 68HC16MODULE-DIP module’s

SW1 switch is in the OFF position.

5) Connect the 8V to 20V power supply to the

68HC16MODULE-DIP module’s terminal block (J2)

located next to SW1. Observe the polarity marked

on the board.

6) Connect the 5V power supply to the VDD pad (with

respect to the GND pad) on the MAX1162 EV kit

board.

7) Connect the -5V power supply to the VEE pad (with

respect to the GND pad) on the MAX1162 EV kit

board.

8) Apply a 4.096V reference voltage to the MAX1162

EV kit’s terminal block (TB0) located in the upper-

left corner of the MAX1162 EV kit board. Observe

the polarity marked on the board.

9) Connect a standard serial cable from the comput-

er’s serial port to the 68HC16MODULE-DIP module.

If the PC’s standard serial port has a 9-pin connec-

tor, use a straight-through, 9-pin female-to-male

cable. If the PC’s only available standard serial port

has 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.

10) Start the MAX1162 program by opening its icon in

the Start | Programs

menu.

11) Turn on all power supplies and enable the refer-

ence voltage. Slide SW1 to the ON position on the

68HC16MODULE-DIP module. Press the OK button

to automatically connect and download the

KIT1162.C16 file to the module.

12) Apply an input signal (0V to VREF) between AIN

and GND. Observe the readout on the running

Windows program.

Detailed Description

MAX1162 Stand-Alone EV Kit

The MAX1162 EV kit provides a proven PCB layout to

evaluate the MAX1162. It must be interfaced to appro-

priate timing signals for proper operation. Connect 5V

to VDD and -5V to VEE with respect to GND. Apply a

4.096V reference voltage to the MAX1162 EV kit’s ter-

minal block (TB0) located in the upper-left corner of the

MAX1162 EV kit board. See the MAX1162 EV Kit

Schematic (Figure 2) and refer to the MAX1162 data

sheet for timing requirements.

MAX1162 EV System

The MAX1162EVC16 EV system operates from three

user-supplied power supplies: 8V to 20V, 5V, and -5V.

Connect the 8V to 20V power supply to the µC mod-

ule’s terminal block (J2) located next to SW1. Observe

the polarity marked on the board. Connect 5V to VDD

and -5V to VEE with respect to GND on the MAX1162

EV kit board. Apply a 4.096V reference voltage to the

MAX1162 EV kit’s terminal block (TB0) located in the

upper left corner of the MAX1162 EV kit board. See the

MAX1162 EV Kit Schematic (Figure 2).

Windows 98/2000/XP-compatible software interfaces to

the EV system board through the PC’s standard serial

port (virtual COM port). See the Quick Start section for

complete setup and operating instructions.

Detailed Description of

Software

The EV software’s main window is shown in Figure 1. It

controls the serial clock speed and sample rate. It also

displays the voltage and output code as well as some

statistics of the input signal. A separate graph shows

the data changing in real time. The update rate is limit-

ed to about 10 samples per second, due to COM port

bandwidth limitations.

Sample Rate

The SPI SCLK Frequency area allows the user to vary

the ADC to µC sample rate. The PC is not capable of

retrieving the data that was stored in the memory of the

µC as fast as the µC can obtain the data from the ADC.

This is because the µC’s SPI interface is much faster

than the PC’s standard serial port (virtual COM port).

Hence, the ADC to µC sample rate refers to the sample

1 2 3 4 5 6 7 8

Evaluate: MAX1162/MAX1062 1

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