MAX3100EVKIT+【PDF 4/12 页】KIT EVAL FOR MAX3100

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MAX3100 Evaluation Kit

Setting the PC UART

The PC UART Setting group box configures the PC

serial port that communicates with the EV kit to the set-

ting in the PC UART Setting group box. After the Open

button is pressed and the port is opened successfully,

the PC serial port settings cannot be changed until the

port is closed. To change the PC serial port setting or

release the serial ports, close the PC serial port by

pressing the Close button.

For the PC serial port to communicate with the EV kit,

both the PC and EV kit serial ports should be config-

ured exactly the same. Set the SW5 and SW6 DIP

switches on the EV kit board appropriately and then

press and release SW1. The on-board μC reads DIP

switch on/off states and writes a 16-bit word to config-

ure the MAX3100.

Reading the MAX3100

Configuration Register

Press the Read Conf. Reg. button inside the PC Sends

a Read Configuration Register Command to EV Kit

group box to send a command (0x07) from the PC to

the EV kit. When the μC receives and parses the mean-

ing of the command, the μC reads the MAX3100 config-

uration register and groups the 14 register bits into 2

bytes. The μC then writes the 2 bytes to the MAX3100’s

write-data register. The PC receives the 2 bytes of data

and displays the corresponding configuration-register

bits on the GUI.

Sending One ASCII

Character to the EV Kit

The PC Sends One ASCII Character to EV Kit group

box allows a user to select an ASCII character and send

it to the EV kit. Depending on the UART frame length,

the panel on the right displays the 7-bit or 8-bit binary

digits of the ASCII character. The PC adds start, stop,

and parity bits according to the current UART settings.

When the MAX3100 receives the character, it generates

an interrupt request to the μC by pulling the IRQ line

low. The μC moves the data from the MAX3100 and dis-

plays the single digit on the seven-segment LED.

Sending a Group of ASCII

Characters to the EV Kit

The PC Sends a Group of Characters to EV Kit group

box allows a user to type 50 characters (max) in the

memo box and sends them to the EV kit. The format of

the packet sent to the EV kit is as follows:

[Message Header (0x01)], [ASCII characters],

[End of message (0x02)]

When the MAX3100 receives the characters, it gener-

ates interrupt requests to the μC by pulling the IRQ line

low. The μC should move the data from the first-in-first-

out buffer (FIFO) quickly to avoid a buffer overflow.

After the μC receives an end-of-a-message byte, the

μC displays the characters one after another, with

approximately 0.5s delay between each character.

Sending a Read Temp Sensor

Command to the EV Kit

Press the Read Temp Sensor button inside the PC

Sends a Read Temp Sensor Command to EV Kit

group box to send a command (0x03) from the PC to the

EV kit. When the μC receives and parses the meaning of

the command, the μC gets temperature data (grouped in

2 bytes) from the on-board digital temperature sensor.

The μC then writes the 2 bytes to the MAX3100’s write-

data register. Lastly, the PC receives the 2 bytes of data

and displays the corresponding temperature.

Check the Auto Read Every 1 Second checkbox to

monitor the temperature continuously. Place the tip of

your finger on top of U4 to change the temperature.

Sending a Read DIP Switch

States Command to the EV Kit

Press the Read Switch States button inside the PC

Sends a Read DIP Switch States Command to EV Kit

group box to send a command (0x04) from the PC to

the EV kit. When the IC receives and parses the mean-

ing of the command, the μC gets DIP-switch data

(grouped in 3 bytes). The μC then writes the 3 bytes to

the MAX3100’s write-data register. The PC receives the

3 bytes of data and displays the corresponding switch

states on the GUI.

Check the Auto Read Every 1 Second checkbox to

monitor the switch on/off states. Use the tip of a pen to

change the switch positions.

Do not press SW1 unintentionally. Pressing SW1 reconfi-

gures the MAX3100 from the current DIP-switch settings.

PC Waits for SW2 or SW3

to Be Pressed on EV Kit

Press the Start Receiving Data button inside the PC

Waits for SW2 or SW3 to be Pressed on EV Kit group

box to prepare the software GUI for receiving a 0x05 or

0x06 byte from the EV kit. Press SW2 to send 0x05 or

SW3 to send 0x06 to the PC. Press the Stop Receiving

Data button to stop the PC from listening on the opened

port. Do not press SW2 or SW3 on the EV kit if the PC is

not expecting to receive data. For example, pressing

SW2 or SW3 after the Stop Receiving Data button has

been pressed corrupts other receiving operations (e.g.,

Read Temp Sensor or Read Switch States ).

4

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