MAX3111EEVKIT+ Maxim Integrated, MAX3111EEVKIT+ Datasheet - Page 5

• Manufacturer Part Number: MAX3111EEVKIT+
• Description: UART Interface IC Evaluation Kit for the MAX3111E
• Manufacturer: Maxim Integrated

Specifications of MAX3111EEVKIT+

• Number Of Channels: 2
• Data Rate: 250 Kbps
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 3 V
• Supply Current: 1.4 mA

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 MAX3111E receives the character, it gener-
ates an interrupt request to the µC by pulling the IRQ
line low. The µC moves the data from the MAX3111E
and displays the single digit on the 7-segment LED.
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:
When the MAX3111E receives the characters, it gener-
ates interrupt requests to the µC by pulling the IRQ line
low. The µC should read 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 of delay between each character.
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 mean-
ing of the command, the µC gets temperature data
(grouped in 2 bytes) from the on-board digital tempera-
ture sensor. The µC then writes the 2 bytes to the
MAX3111E’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.
[Message Header (0x01)], [ASCII characters],
[End of message (0x02)]
Sensor Command to the EV Kit
_______________________________________________________________________________________
Sending a Group of ASCII
Characters to the EV Kit
Character to the EV Kit
Sending a Read Temp
Sending One ASCII
MAX3111E Evaluation 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 µC 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 MAX3111E’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 reconfig-
ures the MAX3111E from the current DIP-switch settings.
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).
The MAX3111E EV kit uses the MAXQ2000-RAX as a
host µC to communicate with the MAX3111E through
the SPI interface. The µC displays received characters
on a 7-segment LED display. The µC also implements a
master I
the on-board MAX6626 temperature sensor.
When the MAX3111E UART works in IrDA mode, the
RS-232 electrical link is used by the PC to communi-
cate with the µC.
The EV kit is designed as a DCE device. The J1 female
DB9 connector pin functions are shown in Figure 3. The
EV kit TX line is connected to the PC RX line. The EV kit
RX line is connected to the PC TX line. The EV kit RTS
line is connected to the PC CTS line. The EV kit CTS line
is connected to the PC RTS line.
Detailed Description of Hardware
2
C-compatible interface to communicate with
States Command to the EV Kit
Sending a Read DIP Switch
PC Waits for SW2 or SW3
to be Pressed on EV Kit
5