19-4083; Rev 0; 3/08
MAX3100 Evaluation Kit
General Description
The MAX3100 evaluation kit (EV kit) provides a proven
design to evaluate the MAX3100 SPI™/MICROWIRE™
-compatible universal asynchronous receiver transmit-
ter (UART). The EV kit also includes Windows 2000/XP/
Vista
®
-compatible software that provides a simple
graphical user interface (GUI) for exercising the fea-
tures of the MAX3100.
The MAX3100 uses the SPI/MICROWIRE interface for
communication with the on-board MAXQ2000 micro-
controller (µC). The on-board DIP switches and
momentary pushbutton switches are used to configure
the MAX3100 internal registers.
The EV kit can be connected to a PC serial port directly
or through a straight-through extension cable. The PC
is a data terminal equipment (DTE) device and the EV
kit is a data communications equipment (DCE) device.
After the EV kit and the PC serial port are configured
properly, the PC can send characters to the MAX3100.
The on-board MAXQ2000 µC reads the received data
from the MAX3100 and displays the characters on the on-
board seven-segment LED or sends back data to the PC.
Other switches, jumpers, and pads are provided to
modify the board to the numerous configurations avail-
able for the MAX3100.
Features
♦
SPI/MICROWIRE-Compatible µC Interface
♦
On-Board µC Provides Flexible Configuration
Possibilities
♦
Windows 2000/XP/Vista (32-Bit)-Compatible
Software
♦
Lead-Free and RoHS-Compliant
♦
Proven PCB Layout
♦
Fully Assembled and Tested
Evaluates: MAX3100
Ordering Information
PART
MAX3100EVKIT+
TYPE
EV Kit
+Denotes
lead-free and RoHS-compliant.
Component List
DESIGNATION
C1–C5, C8, C9,
C12–C16
QTY
12
DESCRIPTION
0.1µF ±10%, 16V X7R ceramic
capacitors (0603)
Murata GRM188R71C104K
39pF ±5%, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H390J
10pF ±5%, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H100J
10µF ±10%, 10V X5R ceramic
capacitor (0805)
Murata GRM21BR61A106K
Super red, 7-segment, common-
cathode LED
Green LEDs (0603)
DESIGNATION
J1
J2
J3
JU1–JU4
JU5
R1
R2, R3, R4
R5, R6, R7
SW1–SW4
SW5
SW6
QTY
1
1
0
4
1
1
3
3
4
1
1
DESCRIPTION
DB-9 female R/A 0.318in D-SUB
serial port connector
1 x 5 header
Not installed, vertical 2 x 5-pin
header
2-pin headers
2 x 8 header
150Ω ±5%, 8-element chip resistor
network (0603 x 8)
10kΩ ±5% resistors (0603)
150Ω ±5% resistors (0603)
Momentary pushbutton switches
8-position DIP switch, top-slide
surface mount
12-position DIP switch, top-slide
surface mount
C6, C7
2
C10, C11
2
C17
1
D1
D2, D3, D4
1
3
SPI is a trademark of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
Windows Vista is a registered trademark of Microsoft Corp.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX3100 Evaluation Kit
Evaluates: MAX3100
Component List (continued)
DESIGNATION
U1
QTY
1
DESCRIPTION
SPI/MICROWIRE-compatible UART
(16 QSOP)
Maxim MAX3100CEE+
RS-232 transceiver (16 TSSOP)
Maxim MAX3232ECUE+
Microcontroller (68 QFN-EP*)
Maxim MAXQ2000-RAX+
Digital temperature sensor
(6 TDFN-EP*)
Maxim MAX6626PMTT+
LDO regulator (5 SC70)
Maxim MAX8511EXK25+
Octal buffer (20 TSSOP)
3.6864MHz crystal
ECS ECS-36-20-5PX-TR
16MHz crystal
Hong Kong X’tals
SSM1600000E18FAF
Shunts
DB9 male to DB9 female serial
straight-through cable
PCB: MAX3100 Evaluation Kit+
Quick Start
Required Equipment
Before beginning, the following equipment is needed:
• MAX3100 EV kit (RS-232 serial cable included)
•
•
3.3V, 200mA DC power supply
A user-supplied Windows 2000/XP/Vista PC with a
spare serial RS-232 port
OR
•
A user-supplied Windows 2000/XP/Vista PC with a spare
USB port and Maxim’s USBTO232+ converter board
U2
U3
1
1
U4
1
U5
U6
Y1
1
1
1
Note:
In the following sections, software-related items are
identified by bolding. Text in
bold
refers to items directly
from the EV kit software. Text in
bold and underlined
refers to items from the Windows operating system.
Procedure
The MAX3100 EV kit is fully assembled and tested.
Follow the steps below to verify board operation.
Caution: Do not turn on the power supply until all
connections are completed.
1) Visit www.maxim-ic.com/evkitsoftware to download
the latest version of the EV kit software,
3100Rxx.ZIP. Save the EV kit software to a tempo-
rary folder and uncompress the ZIP file.
2) Install the EV kit software on your computer by run-
ning the INSTALL.EXE program inside the temporary
folder. The program files are copied and icons are
created in the Windows
Start | Programs
menu.
3) Verify that all jumpers (JU1–JU5) are in their default
positions, as shown in Table 1 (JU1, JU2: Open;
JU3, JU4, JU5: 1-2).
4) Verify that both DIP switches (SW5, SW6) are in
their default positions, as shown in Tables 2 and 3
(all positions On).
5) Connect the EV kit to the PC using the RS-232 serial
cable.
6) Connect the 3.3V power supply to the +3.3V and
GND pads or headers on the EV kit board.
7) Turn on the 3.3V power supply. Verify that all seg-
ments of D1 are lit up, D2, D3, D4 are off.
8) Start the MAX3100 EV kit software by opening its
icon in the
Start | Programs
menu. The EV kit soft-
ware main window appears, as shown in Figure 1.
9) Press the SW1 momentary pushbutton switch on the
EV kit board. The µC reads SW5 and SW6 DIP
switch states and configures MAX3100 through a
write-configuration command. Refer to the MAX3100
IC data sheet for details.
Y2
—
—
—
1
12
1
1
*EP
= Exposed pad.
Component Suppliers
SUPPLIER
ECS, Inc.
International
Hong Kong
X’tals Ltd.
Murata
Electronics North
America, Inc.
PHONE
800-237-1401
WEBSITE
www.ecsxtal.com
+852-3511-2388 www.hongkongcrystal.com
770-436-1300
www.murata-northamerica.com
Note:
Indicate that you are using the MAX3100 when contact-
ing these component suppliers.
MAX3100 EV Kit Files
FILE
MAX3100.EXE
INSTALL.EXE
UNINST.INI
DESCRIPTION
Application program
Installs the EV kit files on your computer
Uninstalls the EV kit software
2
_______________________________________________________________________________________
MAX3100 Evaluation Kit
Note:
The EV kit sets the following MAX3100 register
bits to a fixed logic because the µC firmware relies on
these settings to function properly; a user cannot
change these settings:
•
FEN
= 0 (FIFO Enable. Enables the receive FIFO
when
FEN
= 0. When
FEN
= 1, FIFO is disabled.)
•
•
•
•
TM
= 1 (Mask for T bit.
IRQ
is asserted if
TM
= 1
and T = 1.)
RM
= 1 (Mask for R bit.
IRQ
is asserted if
RM
= 1
and R = 1.)
PM
= 1 (Mask for Pr bit.
IRQ
is asserted if
PM
= 1
and Pr = 1.)
RAM
= 1 (Mask for RA/FE bit.
IRQ
is asserted if
RAM
= 1 and RA/FE = 1.)
Note:
Many PCs do not support 230.4kbps baud rate. If
this is the case, select a lower baud rate on the GUI
and open the port. Change the B3–B0 settings on the
EV kit board and press SW1 to configure the MAX3100
accordingly.
11) Click the up or down arrow on the spin box. The PC
sends a single ASCII character to the EV kit. Verify that
the seven-segment LED follows the GUI selections.
Evaluates: MAX3100
Detailed Description of Software
The EV kit is only designed to demonstrate the features
of the MAX3100. No robust error checking or flow-
control algorithms are implemented. All data is in raw
binary format without coding and decoding. A user
should connect an oscilloscope to monitor the wave-
forms on the signal lines to better understand the data
transactions.
The software main window includes seven group
boxes, as shown in Figure 1.
10) On the software GUI, accept the default settings for
the PC UART. Click the
Select Port
drop-down list to
select the COM port that connects to the EV kit.
Press the
Open
button to open and configure the PC
COM port setting as defined in the
PC UART Setting
group box. Check the status bar at the bottom of the
GUI to verify that the port is opened successfully.
Figure 1. Software Main Window
_______________________________________________________________________________________
3
MAX3100 Evaluation Kit
Evaluates: MAX3100
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.
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.
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 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.
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.
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).
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
4
_______________________________________________________________________________________
MAX3100 Evaluation Kit
Detailed Description of Hardware
The MAX3100 EV kit uses the MAXQ2000-RAX as a
host µC to communicate with the MAX3100 through the
SPI interface. The µC converts received characters to a
seven-segment LED display. The µC also implements a
master I
2
C-compatible interface to communicate with
the on-board MAX6626 temperature sensor.
The EV kit has a MAX3232 RS-232 transceiver to facili-
tate communication with a PC.
The EV kit is designed as a DCE device. The J1 female
DB9 connector pin functions are shown in Figure 2. EV
kit TX line is connected to PC RX line. EV kit RX line is
connected to PC TX line. EV kit RTS line is connected to
PC CTS line. EV kit CTS line is connected to PC RTS line.
The data communication between the EV kit and the PC
only requires TX and RX lines.
The logic of the
RTS
line (J2, pin 4) on the EV kit is con-
trolled by the MAX3100’s RTS configuration bit. RTS = 1
sets the
RTS
line to logic 0. RTS = 0 sets the RTS line to
logic 1. The logic of the
CTS
line (J2, pin 5) on the EV
kit is controlled by the PC’s hardware flow control
(MAX3100’s
CTS
= 0, D3 = On; MAX3100’s
CTS
= 1,
D3 = Off).
MAX3100 Baud Rate Generation
Bits B3–B0 in the MAX3100 write-configuration register
determine the baud-rate divisor (BRD), which divides
the X1 oscillator frequency. The MAX3100 internal oscil-
lator operates with either a 1.8432MHz or a 3.6864MHz
crystal, or is driven at X1 with a 45% to 55% duty-cycle
square wave. The MAX3100 IC data sheet shows BRDs
for given input codes, as well as the baud rate for
1.8432MHz and 3.684MHz crystals. The generator’s
clock is 16 times the baud rate.
On the EV kit board, a 3.684MHz crystal is installed. A
user can replace it with a 1.8432MHz crystal or remove
Y1 and apply an external square wave on the EXTERNAL
CLOCK pad.
A user should first set B3–B0 bits to the desired values
on SW6 and then press and release SW1 to configure
the MAX3100 BRD.
Evaluates: MAX3100
Hardware Reset
Press SW4 on the EV kit to reset the µC and the
MAX3100 to its initial power-on-reset (POR) state.
Jumper and Switch Settings
See Tables 1, 2, and 3 for a description of the EV kit
jumpers and switch settings.
Figure 2. EV Kit J1 Female DB9 Connector Pin Functions
_______________________________________________________________________________________
5
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