Maxim USBTO232 Betriebsanweisung PDF herunterladen (Seite 4)

Evaluate: MAX1162/MAX1062

rate at which data is being sampled by the ADC and

stored in the µC’s memory. Use the pulldown menu to

select the desired SCLK frequency. The first two digits

are the divisor for the µC’s internal clock. The next float-

ing point number is the corresponding SCLK frequen-

cy. The ADC to µC sample rate is displayed in the ADC

to µC sample rate field located on the right side of the

main window.

The µC to PC transfer rate is controlled using the field

at the bottom of the main window and can be controlled

in two different ways. Pressing the Read button allows

the user to manually grab a sample from the µC’s mem-

ory. Clicking the Read Every checkbox allows the user

to automatically read samples from the µC’s memory at

a rate selectable in milliseconds.

To retrieve a block of consecutively sampled data to

the PC, click on the Sample menu located at the top

left-hand corner of the main window. The data-block

length is selectable and the data can be saved to a file.

Statistics

The Minimum and Maximum fields in the statistics area

show the highest and lowest readings acquired. The

Average field displays a running mean. When reading

data manually by pressing the Read button, the Average

and RMS fields require approximately five samples until

they are accurately represented. The Clear Statistics

button resets the statistics. To remove offset errors, first

apply zero volts to the active input channel, press the

Clear Statistics button, acquire some samples, and then

check the Null Offset checkbox. Once checked, the

label next to the Null Offset checkbox shows the sam-

pled offset error. This value is subtracted from all subse-

quent measurements until the checkbox is unchecked.

Reference Voltage

The EV software assumes a 4.096V reference voltage,

unless otherwise specified. To override the 4.096V ref-

erence value, apply the new reference voltage at the

terminal block (TB0) on the MAX1162 EV kit board, type

in the new reference voltage, without the volt unit, and

press the Set Vref button. The EV kit software uses the

value typed in the V

REF

field to translate the digital

code to a voltage.

Detailed Description of

Hardware

The MAX1162 is a 16-bit serial ADC. When the

MAX1162 EV kit board is connected to the

68HC16MODULE-DIP module, power is provided to U2

by the module. The user must also provide 5V to VDD

and -5V to VEE (with respect to the GND pads) on the

MAX1162 EV kit board. The MAX1162 EV kit contains

two different types of buffers. U2 is a logic buffer to limit

the load capacitance that is seen by the DOUT line of

the MAX1162. U1 is powered from VDD. U3 is powered

from VDD and VEE. A terminal block (TB0) has also

been provided on the MAX1162 EV kit board for the

external reference. See the Reference Voltage section

and the MAX1162 EV Kit Schematic (Figure 2).

MAX1162 Evaluation System/Evaluation Kit

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Evaluate: MAX1162/MAX1062 1

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