19-1490; Rev 0; 5/99
MAX1403 EV System
The MAX1403 evaluation system (EV system) is a complete, multichannel data-acquisition system consisting of
a MAX1403 evaluation kit (EV kit) and a Maxim 68HC11
microcontroller (µC) module. The MAX1403 is a lowpower, multichannel, serial-output analog-to-digital converter (ADC). Windows 95/98™-compatible software provides a handy user interface to exercise the MAX1403’s
features. Source code in C++ and 68HC11 assembly language is provided for the low-level portion of the software.
Order the EV system for comprehensive evaluation of
the MAX1403 using a personal computer. Order only
the EV kit if the 68HC11 µC module has already been
purchased with a previous Maxim EV system or for custom use in other µC-based systems.
The MAX1403 EV kit and EV system can also be used
to evaluate the MAX1401. Simply order a free sample of
the MAX1401CAI along with the MAX1403EVKIT.
Features
♦ Easy to Configure
♦ Collects Up to 8192 Samples at Full Speed
♦ Complete Evaluation System
♦ Proven PC Board Layout
♦ Fully Assembled and Tested
Ordering Information
PART
TEMP. RANGE
MAX1403EVKIT
0°C to +70°C
User-Supplied
MAX1403EVL11
0°C to +70°C
Windows Software
Note: The MAX1403 software can be used only with the complete evaluation system (MAX1403EVL11), which includes the
68L11DMODULE together with the MAX1403EVKIT.
MAX1403 EV Kit
Component List
MAX1403 Stand-Alone EV Kit
The MAX1403 EV kit provides a proven PC board layout
to facilitate evaluation of the MAX1403 with user-provided software and hardware. It must be interfaced to
appropriate timing signals for proper operation. Refer to
the MAX1403 data sheet for timing requirements. See
Table 2 for jumper functions.
MAX1403 EV System
The MAX1403 EV system operates from a user-supplied +5V to +12V DC power supply.
MAX1403 EV System
Component List
PART
QTY
DESCRIPTION
MAX1403EVKIT
1
MAX1403 Evaluation Kit
68L11DMODULE
1
68HC11 µC Module
Windows 95/98 is a trademark of Microsoft Corp.
INTERFACE TYPE
DESIGNATION QTY
DESCRIPTION
C3–C8
6
100pF ceramic capacitors (1206)
C9, C10, C11
3
0.1µF ceramic capacitors (1206)
C12, C13
0
Not installed
C15
1
2.2µF aluminum electrolytic radialleaded capacitor
J1
1
2 x 20 right-angle socket
J2
1
Female SMA connector
JU1–JU8
0
Not installed
R1–R6
6
100Ω, 5% resistors (1206)
R7, R8
2
10Ω, 5% resistors (1206)
R9
0
Not installed
R10
0
Not installed
Component
Suppliers
U1
1
Maxim MAX1403CAI
U2
1
Maxim MAX6520EUR
(SOT23 voltage reference, 1.2V,
20ppm/°C max)
Y1
1
2.4576MHz ceramic resonator
Murata CST2.45MGW040
None
1
3" x 4" PC board
MAX1403 evaluation kit
None
1
3 1/2" software disk
MAX1403 evaluation kit
None
1
Maxim 68HC11 module monitor, ROM
Version 1.1 (Version 1.0 ROM will not
work with this EV kit.)
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Evaluates: MAX1401/MAX1403
General Description
MAX1403 EV System
Evaluates: MAX1401/MAX1403
MAX1403 EV Kit Files
Windows Application Program Files
FILE
DESCRIPTION
MAX1403.EXE
Application program that runs under
Windows 95/98
MAX1403.HLP
Help file
KIT1403.L11
Software loaded into 68HC11 microcontroller
MAX1403.INI
Program settings file
Example Source Code Files
FILE
DESCRIPTION
MAX1403.CPP
Source code module for driving the
MAX1403, provided for reference. Includes
definitions of the register names and lowlevel access routines. Compiled with
Borland C++ 4.52. Maxim holds the copyright but allows customers to adapt the program for their own use without charge.
MAX1403.H
Header file for MAX1403.CPP, provided for
reference.
68HC16 Source Code Files
FILE
DESCRIPTION
KIT1403.ASM
Main source code for the KIT1403.L11 program, provided for reference. Maxim holds
the copyright but allows customers to
adapt the program for their own use without
charge.
EVKIT.ASM
Source code defining the program interface with the Maxim 68HC11 Module ROM
(Rev. 1.1).
Install/Uninstall Program Files
FILE
2
DESCRIPTION
INSTALL.EXE
Installs the EV kit files on your computer.
UNINST.INI
Database for uninstall program.
UNMAXIM.EXE
Removes the EV kit files from your computer. This file is automatically copied to
C:\WINDOWS during installation.
_________________________Quick Start
Recommended Equipment
Obtain the following equipment before you begin:
• A DC power supply that generates +5VDC to +12VDC
at 30mA to 50mA
• An IBM PC-compatible computer running Windows
95/98
• A spare serial communications port, preferably a 9pin plug
• A serial cable to connect the computer’s serial port
to the Maxim 68HC11 Module
1) Before you begin, make sure your 68HC11 module
has the Rev. 1.1 ROM. The software will not function
with the Rev. 1.0 ROM.
2) Carefully connect the boards by aligning the 40-pin
header of the MAX1403 EV kit with the 40-pin connector of the 68HC11 module. Gently press them
together. The two boards should be flush against
one another.
3) Connect the DC power source to the µC module at
terminal block J2, located next to the ON/OFF
switch, along the top edge of the µC module.
Observe the polarity marked on the board.
4) Connect a cable from the computer’s serial port to
the µC module. If using a 9-pin serial port, use a
straight-through, 9-pin female-to-male cable. If the
only available serial port uses a 25-pin connector, a
standard 25-pin to 9-pin adapter will be required.
The EV kit software checks the modem status lines
(CTS, DSR, DCD) to confirm that the correct port
has been selected.
5) Install the software on your computer by running the
INSTALL.EXE program from the floppy disk. The
program files are copied and icons are created for
them in the Windows 95/98 Start Menu. The EV kit
software evaluates both the MAX1403 and the
MAX1401.
6) Start the MAX1403 program by opening its icon in
the Start Menu.
7) The program will prompt you to connect the µC
module and turn its power on. Slide SW1 to the “ON”
position. Select the correct serial port, and click OK.
The program will automatically download the file
KIT1403.L11 to the module.
_______________________________________________________________________________________
MAX1403 EV System
Upgrading the 68HC11 Module
The MAX1403 EV kit requires Rev. 1.1 of the Maxim
68HC11 Module ROM. Check the label on device U10
on the module; if it says “Rev. 1.0,” the device must be
replaced.
The Rev. 1.1 ROM is a 28-pin DIP that comes with the
EV kit. If it was omitted, contact the factory for a
replacement.
To install the new ROM, use the following procedure.
Use antistatic handling precautions. To reduce the risk
of ESD damage, gather all required materials and perform the installation at one sitting.
1) Slide the ON/OFF switch to the OFF position.
2) Using a flat-blade screwdriver, gently pry U10, the
REV 1.0 ROM, out of its socket.
3) Remove the REV 1.1 ROM from its antistatic packaging.
4) Align the REV 1.1 ROM in the U10 socket pins.
Observe correct polarity (the notch at the top of the
ROM). Verify that the pins are lined up with the
socket, and gently press the ROM into place.
Proceed to the regular Quick Start instructions.
Detailed Description
_________________________of Software
The MAX1403 digitizes up to seven inputs. The various
program functions are grouped into windows that are
accessible from the Show menu on the main menu bar.
Main Display
The main display shows the calculated input voltage
and raw A/D output code for each active channel.
Although there are nine input channels, only certain
configurations are allowed.
Select any single channel or one of the scanning
sequences from the Inputs menu. AIN 1-6 designates
an analog input between the AIN1 pin and the AIN6 pin.
CALOFF designates the signal between the CALOFF+
and CALOFF- pins. CALGAIN designates the signal
between the CALGAIN+ and CALGAIN- pins.
The EV kit software assumes that CALOFF+ and
CALOFF- are grounded so that CALOFF measures 0V.
Similarly, the software assumes that CALGAIN+ is connected to REFIN+ and CALGAIN- is connected to
REFIN- so that CALGAIN measures the reference voltage. These two points calibrate the code-to-voltage
translation function performed in the software.
The MAX1403 automatically triggers its measurements,
unless the FSYNC control bit is set. The EV kit software
communicates with the MAX1403 at intervals determined by the Update Every combo box. To halt this
automatic update, uncheck the Update Every checkbox
or change the Update Every to a value between 100ms
and 60,000ms.
Normally, the microcontroller collects new data as soon
as it becomes available by using the INT pin to trigger
an interrupt service routine. If the INT pin is not used as
an interrupt, then the MAX1403 must not be operated in
free-running mode. Check or uncheck the Use INT
Interrupt checkbox to configure the evaluation kit software.
Configuration Tool
The Configuration Tool controls parameters that apply
to the entire EV kit. Like the other windows, the
Configuration Tool can be activated from the Show
menu of the main menu bar. The CLK control should
match the external ceramic resonator or crystal that
sets the master clock frequency. The VREF Reference
Voltage control tells the software what the reference
voltage is. This is used to convert the raw A/D output
codes into the corresponding input voltage to speed
user evaluation. The Data-Rate control determines how
often the MAX1403 performs a measurement. Some
data rates provide 16-bit, noise-free resolution when
used with the SINC3 filter (discussed below). The Filter
Sync control can be used to inhibit the MAX1403 from
performing its self-timed measurements. The Buffer
Inputs checkbox enables the internal input buffers. The
Burnout Test Currents checkbox enables two small
(0.1µA) current sources to provide an input stimulus.
When used with a transducer, these current sources
can be used to verify that the transducer has not failed
open or short circuit.
At the bottom of the window are input voltage-range
selection buttons. These buttons configure all input
channels for the same input voltage range. Although
the MAX1403 can be operated with three different input
ranges at the same time, the EV kit software supports
only a single range for all channels.
_______________________________________________________________________________________
3
Evaluates: MAX1401/MAX1403
8) When the software successfully establishes communication with the EV kit board, you will see a configuration tool and some other windows. Verify that the
CLKIN and Reference Voltage settings are correct.
Close or minimize this dialog box.
9) Apply input signals to the inputs labeled AIN1–AIN5,
at the bottom edge of the MAX1403 EV kit board.
AIN6 is analog common. Observe the readout on
the screen.
Evaluates: MAX1401/MAX1403
MAX1403 EV System
The digital filter on the MAX1403 can be configured for
SINC3 or SINC1 operation, which affects the filter cutoff
frequency. (SINC1 means SIN(X) ÷ X, and SINC3 means
(SIN(X) ÷ X)3.) The SINC3 filter is required for 16-bit accuracy. The SINC1 filter provides faster settling time with less
accuracy. Alternatively, the raw modulator output can be
driven out the DOUT pin; however, the EV kit software
cannot read data from the MAX1403 in this mode.
Calibration Tool
The MAX1403 EV kit software can average the measurements from the calibration channels and use the
measured values to correct the voltage displays. The
calibration algorithm assumes that the CALOFF inputs
are externally connected together and that the CALGAIN inputs are externally connected to the reference
voltage (VREF). View the calibration tool by selecting it
from the Show menu.
The software automatically disables calibration if either
of the calibration channels reports a code of 0 or
262143. This is to prevent erroneous calibration when
using a transfer function that does not include both 0V
and VREF.
When Use CALOFF and CALGAIN for Calibration is
checked, the software averages the raw A/D codes for
the CALOFF and CALGAIN channels. The average is
calculated as a weighted sum of the new data and the
old average value. The Slower/Faster slide bar controls
the weight of the new data vs. the weight of the old
average.
The EV kit software assumes that all three transfer function registers are set to the same value.
This calibration affects only the displayed voltage, not
the raw code numbers. The average CALOFF and
CALGAIN code values are used as the endpoints of a
linear interpolation, with CALOFF measuring 0V and
CALGAIN measuring VREF.
The linear interpolation formula is as follows:
Voltage =
VREF(Code − CALOFFcode)
(CALGAINcode − CALOFFcode)PGAgain
Note: When using the calibration tool with the
MAX1403 in buffered mode, CALOFF+ and CALOFFshould be disconnected from GND and connected
instead to REFIN+ so that they remain within the specified input range.
Sampling Tool
To sample data at full speed, select Sample from the
main display menu, make your selections, and click on
4
the Begin Sampling button. Sampling rate is controlled
by the Configuration tool. Sample size is restricted to a
power of two. Sample Size controls the number of samples collected on each selected channel. After the
samples have been collected, the data is automatically
uploaded to the host and is graphed. Once displayed,
the data may be saved to a file.
While the Sampling tool is open, the other windows are
locked out. Close the Sampling tool by clicking the
Close icon in the upper corner.
Register Display Tool
This tool displays all of the internal registers of the
MAX1403. Modify any bit value by checking or
unchecking its box. (The START bit and the zero bits in
the Special Function register (SFR) cannot be modified). The Read All Registers button causes the software to read all of the MAX1403’s registers. (Not functional when the MDOUT or FULLPD bit is set.) Refer to
Table 1 for a guide to register bit functions.
Communications Register (COMMS)
Setting the FSYNC control bit inhibits the MAX1403
from performing its self-timed measurements. If
FSYNC = 1 when it is time to perform a measurement,
the MAX1403 simply skips that measurement. Thus,
power-line frequency rejection is not affected by the
FSYNC bit.
Setting the STDBY bit places the part in low-power
standby mode. The serial interface and the CLK oscillator continue to operate. The part can be restored to
normal operation by clearing the STDBY bit.
Special Function Register (SFR)
Setting the MDOUT bit makes the raw modulator output
available on the DOUT pin; however, the EV kit software
cannot read data from the MAX1403 in this mode.
Setting the FULLPD bit in the SFR register places the
part in full power-down mode. The master oscillator
does not run. To restore normal operation, click on the
Reset menu item in the main display. This causes the
68HC11 software to pulse the MAX1403 RESET pin.
Transfer Function Registers (TF1, TF2, TF3)
The three transfer function registers (TF1, TF2, TF3) control how input voltage is mapped to code values. The
transfer function registers control a programmable-gain
amplifier (PGA) and an offset-correction DAC.
If U/B = 1, the transfer function maps unipolar voltages
between 0V and VREF. If U/B = 0, then the transfer
function maps bipolar voltages between -VREF and
+VREF. Next, the PGA increases the code-per-volt pro-
_______________________________________________________________________________________
MAX1403 EV System
When SCAN = 1, the CALOFF and CALGAIN channels
are controlled by TF3. When SCAN = 0, the CALOFF
and CALGAIN channels are controlled by one of the
transfer function registers, as selected by the A1 and
A0 bits.
For simplicity, the EV kit software assumes that all three
transfer functions are configured alike.
Detailed Description
________________________of Hardware
U1, the MAX1403, is a multichannel, high-resolution
A/D converter (refer to the MAX1403 data sheet). U2,
the MAX6520, is a 1.2V reference (refer to the
MAX6520 data sheet). Y1 contains a ceramic resonator
and its load capacitors. R1–R6, together with C3–C8,
form anti-aliasing input filters. R8 and C11 filter the digital power supply. The analog supply comes through filter R7/C10.
Input Filtering
The EV kit has an RC filter on each input with a time
constant of approximately 0.01µs = 10ns (R = 100Ω,
C = 100pF). When scanning between channels, the RC
filter’s settling time may increase the acquisition time
required for full accuracy.
Evaluating the MAX1401
The MAX1401 can be evaluated by shorting across
jumpers JU6 and JU7. The MAX1401 is exactly like the
MAX1403, except that the function of pins 5, 6, 7, and 8
is changed. Instead of the OUT1/OUT2 outputs and
DS0/DS1 inputs, these pins are used to provide access
to the analog signal between the multiplexer and the
A/D converter. Tables 2 and 3 list the jumper functions
and default settings. Refer to the MAX1401 data sheet
for detailed information.
Measuring Supply Current
Supply current can be estimated by measuring the voltage across a series resistor. On the EV kit board, the
MAX1403 draws all of its analog and digital power
through R8, which is 10Ω. In addition, all analog supply
current flows through R7, which is also 10Ω.
Troubleshooting
Problem: unacceptable amounts of noise in the signal.
Collect a sample of 1024 measurements at a 60Hz data
rate. Observe whether the problem is caused by 60Hz
noise.
Any AC-powered equipment connected to the analog
signal ground can inject noise. Try replacing AC-powered DVMs with battery-powered DVMs.
_______________________________________________________________________________________
5
Evaluates: MAX1401/MAX1403
cessing gain, reducing the full-scale voltage range by a
factor of 1, 2, 4, 8, 16, 32, 64, or 128. Finally, the offsetcorrection DAC offsets the voltage range by up to ±7/6
of the full-scale voltage range.
Input pins AIN1 and AIN2 are controlled by TF1. Input
pins AIN3 and AIN4 are controlled by TF2. Input pin
AIN5 is controlled by TF3. Input pin AIN6 is the analog
common.
Evaluates: MAX1401/MAX1403
MAX1403 EV System
Table 1. Guide to Register Bit Functions
REGISTER
COMMS
BIT NAME
0/DRDY
RS2–RS0
R/W
GS1
GS2
SFR
DESCRIPTION
Start bit is zero; DIN pin must be 1 when idle.
Register select for subsequent operation
Selects subsequent read or write operation
RESET
Causes software reset when set to 1
STDBY
Activates standby power-down mode when set to 1
FSYNC
Inhibits the A/D converter when set to 1
A1
Selects the active channel
A0
Selects the active channel
MF1
Selects the data output rate
MF0
Selects the data output rate
CLK
Selects the CLKIN frequency
FS1
Selects the data output rate
FS0
Selects the data output rate
FAST
Selects SINC1 filter instead of SINC3
SCAN
Enables the scanning sequences
M1
Enables the CalGain channel
M0
Enables the CalOff channel
BUFF
Enables the input buffers
DIFF
Selects differential input pairs
BOUT
Enables the transducer burn-out test currents
IOUT
Enables the OUT1 and OUT2 current sources (MAX1403 only)
X2CLK
Selects the CLKIN frequency
MDOUT
Changes the DOUT and INT pins to provide raw modulator output
FULLPD
Activates full power-down mode. Use hardware reset to restore normal operation.
All other bits in SFR must be zero
TF1, 2, 3
G2–G0
U/B
DATA
Selects unipolar or bipolar coding
D3–D0
Selects the offset correction DAC code; D3 = sign, D2–D0 = magnitude
D17–D0
Raw code value
DS1
Value of the DS1 input pin (MAX1403 only)
DS0
Value of the DS0 input pin (MAX1403 only)
CID2–CID0
6
Selects the PGA Gain
Channel identification tag
______________________________________________________________________________________
MAX1403 EV System
JUMPER
JU1
JU2
JU3
JU4
JU5
STATE
Closed*
Open
Closed*
Open
Closed*
Open
Closed*
Open
Closed*
Open
Evaluates: MAX1401/MAX1403
Table 2. Jumper Functions
FUNCTION
Use CalGain inputs for gain calibration (CALGAIN+ = REFIN+)
Use CalGain inputs as general purpose signal inputs
Use CalGain inputs for gain calibration (CALGAIN- = REFIN-)
Use CalGain inputs as general purpose signal inputs
Use CalOff inputs for offset calibration (CALOFF+ = GND)
Use CalOff inputs as general purpose signal inputs
Use CalOff inputs for offset calibration (CALOFF- = GND)
Use CalOff inputs as general purpose signal inputs
Use on-board reference U2 (REFIN- = GND)
REFIN+ and REFIN- must be driven by an external reference
Closed
Connects pin 5 to pin 7
MAX1403: pin 5 = digital input DS1, pin 7 = current source
MAX1401: normal operation
Open
Disconnects pin 5 from pin 7
MAX1403: pin 5 = digital input DS1, pin 7 = current source
MAX1401: insert filter between mux and A/D
Closed
Connects pin 6 to pin 8
MAX1403: pin 6 = digital input DS0, pin 8 = current source
MAX1401: normal operation
Open
Disconnects pin 6 from pin 8
MAX1403: pin 6 = digital input DS0, pin 8 = current source
MAX1401: insert filter between mux and A/D
JU6
JU7
JU8
Closed*
Open
Use on-board reference U2 (REFIN+ = 1.2V)
REFIN+ and REFIN- must be driven by an external reference
* Default trace on top layer of PC board
Table 3. Default Jumper Settings
JUMPER
STATE
FUNCTION
JU1
Closed*
Use CalGain inputs for gain calibration (CALGAIN+ = REFIN+)
JU2
Closed*
Use CalGain inputs for gain calibration (CALGAIN- = REFIN-)
JU3
Closed*
Use CalOff inputs for offset calibration (CALOFF+ = GND)
JU4
Closed*
Use CalOff inputs for offset calibration (CALOFF- = GND)
JU5
Closed*
Use on-board reference U2 (REFIN- = GND)
JU6
Open
Disconnects pin 5 from pin 7
MAX1403: pin 5 = digital input DS1, pin 7 = current source
MAX1401: insert filter between mux and A/D
JU7
Open
Disconnects pin 6 from pin 8
MAX1403: pin 6 = digital input DS0, pin 8 = current source
MAX1401: insert filter between mux and A/D
JU8
Closed*
Use on-board reference U2 (REFIN+ = 1.2V)
* Default trace on top layer of PC board
_______________________________________________________________________________________
7
8
AIN4
AIN3
AIN2
AIN1
OUT1
OUT2
DS0
DS1
J1-33
J1-34
AVDD
1
R1
100Ω
R4
100Ω
R3
100Ω
R2
AGND
JU7
AGND
AGND
AGND
AGND
JU6
DGND
100Ω
2
Y1
2.4576MHz
3
C6
100pF
C5
100pF
C4
100pF
14
13
12
11
10
9
8
7
6
5
4
3
2
1
U1
AIN4
AIN3
AIN2
AIN1
V+
AGND
OUT1 (ADCIN-)
OUT2 (ADCIN+)
DS0 (MUXOUT-)
DS1 (MUXOUT+)
DGND
VDD
INT
DOUT
DIN
SCLK
AIN5
AIN6
CALGAIN-
CALGAIN+
REFIN-
REFIN+
CALOFF-
CALOFF+
MAX1403
RESET (MAX1401)
CS
CLKOUT
CLKIN
DGND
EXTCLK
C3
100pF
J2
15
16
17
18
19
20
21
22
23
24
25
26
27
28
C7
100pF
C8
100pF
C12
OPEN
R10
DVDD
10Ω
R7
R9
AGND
AGND
R6
100Ω
R5
100Ω
SHORT
C9
0.1µF
JU4
C13 SHORT
OPEN
DGND
INT
MISO
MOSI
SCLK
JU2
JU1
AGND
JU3
C10
0.1µF
J1-29
J1-35
J1-36
J1-37
AIN5
AIN6
AVDD
DVDD
C11
0.1µF
GAIN-
GAIN+
REF-
REF+
OFFSET-
OFFSET+
DGND
10Ω
R8
JU5
JU8
1
VIN
GND
3
2
VOUT
MAX6520
U2
J1-8
J1-7
AGND
C15
2.2µF
J1-6
J1-5
J1-4
J1-3
J1-2
J1-1
Evaluates: MAX1401/MAX1403
MAX1403 EV System
Figure 1. MAX1403 EV Kit Schematic
_______________________________________________________________________________________
MAX1403 EV System
Evaluates: MAX1401/MAX1403
1.0"
Figure 2. MAX1403 EV Kit Component Placement Guide—Component Side
_______________________________________________________________________________________
9
Evaluates: MAX1401/MAX1403
MAX1403 EV System
1.0"
Figure 3. MAX1403 EV Kit PC Board Layout—Component Side
10
______________________________________________________________________________________
MAX1403 EV System
Evaluates: MAX1401/MAX1403
1.0"
Figure 4. MAX1403 EV Kit PC Board Layout—Solder Side
______________________________________________________________________________________
11
Evaluates: MAX1401/MAX1403
MAX1403 EV System
NOTES
12
______________________________________________________________________________________
68L11D Module
The 68L11D module is an assembled and tested PC
board intended for use with Maxim’s low-voltage dataacquisition evaluation kits (EV kits). The module uses
Motorola’s MC68L11D0FN2 microcontroller (µC) to collect data samples using the SPI interface. It requires an
IBM PC computer and an external DC power supply of
+5V to +16V, or as specified in the appropriate EV kit
manual.
Maxim’s 68L11D module allows customers to evaluate
selected Maxim products. It is not intended to be a
microprocessor development platform, and Maxim
does not support such use.
____________________Component List
DESIGNATION QTY
DESCRIPTION
C1, C2
2
22pF ceramic capacitors
C3
1
0.01µF ceramic capacitor
C4–C9,
C12–C18
13
0.1µF ceramic capacitors
C10, C11
2
22µF, 20V tantalum capacitors
D1
1
1N4001 diode
J1
1
40-pin, right-angle header
____________________Getting Started
J2
1
2-circuit terminal block
All system components are guaranteed by their various
manufacturers over the +3V to +3.6V power-supply
range. Not all system components are guaranteed over
the entire 2.5V to 5V V DD power-supply adjustment
range. Verify correct operation using the following
procedures:
1) Connect a +5V DC power source (16V max) to the
µC module at the terminal block located next to the
on/off switch, in the upper-right corner of the µC
module. Turn the power switch on.
2) Connect a cable from the computer’s serial port to
the µC module. If using a 9-pin serial port, use a
straight-through, 9-pin, female-to-male cable. If the
only available serial port uses a 25-pin connector, a
standard 25-pin to 9-pin adapter is required.
3) Start the evaluation kit software on the IBM PC.
When the program asks which port the µC module is
connected to, press the space bar until the correct
port is highlighted, and then press ENTER. The software will be in terminal-emulation mode. (If using a
generic terminal-emulation program instead of
Maxim EV kit software, select 1200 baud, eight-bit
character, no parity, one stop bit. Send a space
character to start the monitor program.)
4) Adjust trim potentiometer R2 for the desired VDD
supply voltage. Measure V DD between test point
TP1 and ground. The mounting hole next to R2 is
grounded.
5) To verify correct system operation, press the ESC
key, type a capital “T”, and then select the countdown memory test. If the memory test fails or any
other malfunction is reported, the VDD voltage is too
low; increase VDD and repeat from step 4.
6) Turn the power switch off and connect the µC board
to an appropriate Maxim EV kit board.
J3
1
DB9 right-angle socket
JU1, JU2
2
Open
LED1
1
Light-emitting diode
R1
1
10MΩ, 5% resistor
R2
1
100kΩ potentiometer
R3
1
274kΩ, 1% resistor
R4
1
133kΩ, 1% resistor
R5
1
200Ω, 5% resistor
R6
1
10kΩ SIP resistor pack, pin 1 common
SW1
1
Slide switch
SW2
1
Momentary push-button switch
U1
1
Motorola MC68L11D0FN2
U2
1
Maxim MAX3232CSE
U3
1
74HC00
U4
1
Maxim MAX667CSA
U5
1
32k x 8 static RAM 28-pin socket
Motorola MCM6306DJ15
U10
1
28-pin socket
U6
1
74HCT245
U7
1
Maxim MAX708RCSA
U8
1
74HC573
U9
1
74HC139
U10
1
3V, 8k x 8 ROM
Y1
1
8MHz crystal
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
68L11D Module
_______________General Description
68L11D Module
68L11D Module
_______________Detailed Description
Power Requirements
The 68L11D module draws its power from a user-supplied
power source connected to terminal block J2. Note the
positive and negative markings on the board. Nominal
input voltages should be between +5V and +16V. The
input current requirement for the 68L11D module is typically 20mA plus the current drawn by the evaluation kit
(EV kit).
The VDD supply is set by U4, a MAX667 low-dropout
CMOS regulator. Trim potentiometer R2 sets the supply
voltage, with an adjustment range of approximately 2.5V
to 5V. Although the board is designed primarily for 3V
applications, all of the circuitry is rated to withstand 5V
levels.
68L11D Microcontroller (µC)
Module Hardware
U1 is Motorola’s 68L11D µC. Contact Motorola for µC
information, development, and support.
A MAX708R supervisory circuit on the module monitors
the VDD logic supply, generates the power-on reset,
and produces a reset pulse whenever the manual reset
button (SW2) is pressed. Note that the MAX708R resets
the CPU if the supply voltage falls below 2.66V.
The module provides 32kbytes of external CMOS static
RAM (U5).
The 74HCT245 octal buffer (U6) provides access to an
eight-bit port on the 40-pin interface connector. This
memory-mapped port consists of Intel-compatible read
and write strobes, four chip selects, four address
LSB's, and eight data bits. Table 3 lists the address
ranges for each of the memory-mapped elements on
the 68L11D module.
The MAX3232 is a 3V-powered, RS-232 interface voltage-level shifter. Its built-in charge pump uses external
capacitors to generate the output voltages necessary
to drive RS-232 lines.
2
The 20 x 2-pin header (J1) connects the 68L11D module to a Maxim EV kit. Table 2 lists the function of each
pin. Use the 68L11D module only with EV kits that are
designed to support it, and download only code that is
targeted for the Maxim 68L11D module. Downloading
incorrect object code into the 68L11D module will produce unpredictable results.
The 8k x 8 boot ROM (U10) checks the system and
waits for commands from the host. Refer to the EV kit
manual for specific startup procedures.
Software
All software is supplied on a disk with the EV kit.
Software operating instructions are included in the EV
kit manual.
Serial Communications
J3 is an RS-232 serial port, designed to be compatible
with the IBM PC 9-pin serial port. Use a straight-through
DB9 male-to-female cable to connect J3 to the IBM PC
serial port. If the only available serial port has a 25-pin
connector, use a standard 25-pin to 9-pin adapter.
Table 1 shows J3’s pinout. The hardware-handshake
lines are used by the evaluation software to confirm that
the EV kit is connected to the correct serial port.
Table 1. Serial Communications Port J3
PIN
1
NAME
DCD
FUNCTION
Handshake; hard-wired to DTR and DSR
2
RXD
RS-232-compatible data output from
68L11D module
3
TXD
RS-232-compatible data input to
68L11D module
4
DTR
Handshake; hard-wired to DCD and DSR
5
GND
Signal ground connection
6
DSR
Handshake; hard-wired to DCD and DTR
7
RTS
Handshake; hard-wired to CTS
8
9
CTS
None
Handshake; hard-wired to RTS
Unused
_______________________________________________________________________________________
68L11D Module
PIN
1–4
NAME
GND
5, 6
V++
7, 8
VDD
FUNCTION
Ground
Table 3. 68L11D Module Memory Map
ADDRESS RANGE
(HEX)
FUNCTION
9
RD
Unregulated input voltage
VDD from on-board MAX667
regulator
Read strobe
10
WR
Write strobe
11
CS0
Chip select for 8000-8FFF
12
CS1
Chip select for 9000-9FFF
13
CS2
Chip select for A000-AFFF
14
CS3
ADDR0
Chip select for B000-BFFF
C100-CFFF
Unused
Address bit 0 (LSB)
D000-D03F
Internal register area (U1)
Unused
Boot ROM (U10)
15
0000-7FFF
User RAM area (U5)
8000-8FFF
External chip-select 0 (J1 pin 11)
9000-9FFF
External chip-select 1 (J1 pin 12)
A000-AFFF
External chip-select 2 (J1 pin 13)
B000-BFFF
External chip-select 3 (J1 pin 14)
C000-C03F
Unused
C040-C0FF
Internal RAM (U1)
16
ADDR1
Address bit 1
D040-DFFF
17
ADDR2
Address bit 2
E000-FFFF
18
ADDR3
Address bit 3
19
DB0
20–26
DB1–DB7
27
PA0/IC3
General I/O port bit 0 (LSB)
28
PA1/IC2
General I/O port
29
PA2/IC1
General I/O port
30
PA3/IC4/OC5
General I/O port
31
PA4/OC4
General I/O port
32
PA5/OC3
General I/O port
33
PA6/OC2
General I/O port
34
PA7/OC1/PAI
35
MISO
SPI master-in, slave-out
36
MOSI
SPI master-out, slave-in
37
SCK
SPI serial clock
38
RESERVED
39
40
E
SS
68L11D Module
Table 2. 40-Pin Data-Connector Signals
Data bus bit 0 (LSB)
Data bus bits 1–7
General I/O port MSB
Reserved for factory use
System E-clock output
SPI slave-select input
_______________________________________________________________________________________
3
68L11D Module
68L11D Module
J2
VPREREG
D1
1N4001
VDD
U4
SW1
C10
22µF
20V
1
2
VDD
VDD
3
C16
4
C13
C12
0.1µF
0.1µF
TXD
1
3
4
5
16
VCC
C1+
C1C2+
C2-
U2
V+
MAX3232
V-
C14
2
C15
6
11
T1
T2
12
LBI
VSET
GND
SHDN
J3-7
RTS
14
J3-2
RXD
7
J3-3
TXD
C3
0.01µF
6
1.255V
R2
100k
5
VDD
VCC
U7
J3-4
DTR
8
R2
7
R4
133k
1%
C4
0.1µF
MAX708R
1
J3-6
DSR
9
LBO
C11
22µF
20V
R3
274k
1%
0.1µF
13
R1
VOUT
8
VDD
J3-8
CTS
0.1µF
10
RXD
0.1µF
DD MAX667 VIN
PFO
MR
SW2
RESET
NC
J3-1
DCD
RESET
GND
4
15
J3-5
GND
PFI
GND
3
RESET
5
6
8
7
RESET
J3-9
RI
POWER CONNECTIONS
U1
GND
VDD
1, 2
22
PA0/IN3
PA1/IN2
PA2/IN1
PA3/IN4/OUT5
PA4/OUT4
PA5/OUT3
PA6/OUT2
PA7/OUT1/PULSE ACCIN
VDD
C17
0.1µF
RXD
TXD
MISO
MOSI
SCK
SS
C2
22pF
Y1
8.00MHz
C1
22pF
R1
10M
RESET
XIRQ
IRQ
E
30
29
28
27
26
25
24
23
16
17
18
19
20
21
14
11
15
44
43
42
3
PA0
PC0
U1
4
PA1
PC1
5
PA2
PC2
MC68L11D0FN2 PC3 6
PA3
7
PA4
PC4
8
PA5
PC5
9
PA6
PC6
10
PA7
PC7
13
PD6/AS
PD0/RXD
PD1/TXD
12
PD7/R/W 39
PD2/MISO
PB0 38
PD3/MOSI
PD4/SCK
PB1 37
PD5/SS
PB2 36
PB3 35
RESET
PB4 34
XIRQ/VPP
PB5 33
IRQ/CE
PB6 32
PB7
XTAL
41
EXTAL
MODA/LIR 40
E
MODB/VSTBY
Figure 1. 68L11D Module Schematic Diagram
4
_______________________________________________________________________________________
D0
D1
D2
D3
D4
D5
D6
D7
AS
R/W
A8
A9
A10
A11
A12
A13
A14
A15
MODA
MODB
68L11D Module
68L11D Module
U9A
74HC139
A14
A15
2
3
A0
A1
Y0
Y1
Y2
GND
VDD
1
E
Y3
4
5
6
IOBUFFER
7
CS-11XXX
U9B
74HC139
C5
0.1µF
A12
14 A0
Y0
A13
13 A1
Y1
Y2
IOBUFFER
15 E
Y3
12
CSAXXX
9
U3A
2
CS9XXX
10
1
R/W
CS8XXX
11
A15
RD
WR
CSBXXX
3
R/W
74HC00
4
R/W
VDD
6
RD
U3B
5
E
74HC00
C6
0.1µF
9
R/W
U3C
10
E
8
WR
74HC00
12
E
U3D
13
A13
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
11 DATA-XX1X
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
VDD
VDD
CS-11XXX
10
9
8
7
6
5
4
3
25
24
21
23
2
26
1
A0
U5
A1
A2 32 x 8 STATIC RAM
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
20
22
27
CS
OE
WE
10
9
8
7
6
5
4
3
25
24
21
23
2
26
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
27
1
22
20
PGM
VPP
OE
CE
10
U10
9
8
27LV64
8k x 8 ROM
7
6
5
4
3
25
24
21
23
2
26
I/0
I/1
I/2
I/3
I/4
I/5
I/6
I/7
11
12
13
15
16
17
18
19
D0
D1
D2
D3
D4
D5
D6
D7
VDD
C7
0.1µF
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
11
12
13
15
16
17
18
19
D0
D1
D2
D3
D4
D5
D6
D7
VDD
C8
0.1µF
74HC00
POWER CONNECTIONS
GND
AS
D0
D1
D2
D3
D4
D5
D6
D7
1
OE
11
C U8
2
3
4
5
6
7
8
9
VDD
74HC573
D0
D1
D2
D3
D4
D5
D6
D7
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
19
18
17
16
15
14
13
12
A0
A1
A2
A3
A4
A5
A6
A7
GND
U3
14
7
U5
28
14
U8
20
10
U9
16
8
U10
28
14
VDD
C18
0.1µF
Figure 1. 68L11D Module Schematic Diagram (continued)
_______________________________________________________________________________________
5
68L11D Module
68L11D Module
VDD
R5
200Ω
GND
GND
J1-1
J1-2
GND
GND
J1-3
J1-4
GND
VPREREG
J1-5
J1-6
VPREREG
VDD
J1-7
J1-8
VDD
RD
J1-9
J1-10
WR
CS8XXX
J1-11
J1-12
CS9XXX
CSAXXX
J1-13
J1-14
CSBXXX
A0
J1-15
J1-16
A1
A2
J1-17
J1-18
A3
EXTD0
J1-19
J1-20
EXTD1
EXTD2
J1-21
J1-22
EXTD3
EXTD4
J1-23
J1-24
EXTD5
EXTD6
J1-25
J1-26
EXTD7
PA0/IN3
J1-27
J1-28
PA1/IN2
LED1
19
1 OE
DIR U6
IOBUFFER
RD
2
3
4
5
6
7
8
9
D0
D1
D2
D3
D4
D5
D6
D7
U6
VDD
GND
20
10
VDD
74HCT245 18
B1
A1
A2
A3
A4
A5
A6
A7
A8
B2
B3
B4
B5
B6
B7
B8
EXTD0
EXTD1
EXTD2
EXTD3
EXTD4
EXTD5
EXTD6
EXTD7
17
16
15
14
13
12
11
C9
0.1µF
VDD
R6A
10k
2
XIRQ
PA2/IN1
J1-29
J1-30
PA3/IN4/OUT5
PA4/OUT4
J1-31
J1-32
PA5/OUT3
PA6/OUT2
J1-33
J1-34
PA7/OUT1/PULSE ACCIN
MISO
J1-35
J1-36
SCK
J1-37
J1-38
E
J1-39
J1-40
VDD
MOSI
8
RESERVED
SS
7
R6F
R6G
10k
10k
VDD
R6E
10k
R6H
10k
R6I
10k
VDD
6
9
10
R6B
10k
R6C
10k
R6D
10k
SS
3
4
IRQ
JU1
MODA
MODA
MODB
5
JU2
MODB
Figure 1. 68L11D Module Schematic Diagram (continued)
6
_______________________________________________________________________________________
68L11D Module
68L11D Module
Figure 2. 68L11D Module Component Placement Guide
Figure 3. 68L11D Module PC Board Layout—Component Side
_______________________________________________________________________________________
7
68L11D Module
68L11D Module
Figure 4. 68L11D Module PC Board Layout—Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 1999 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
工商网监
湘ICP备2023018690号
