MAX1403EVL11 [MAXIM]
Easy to Configure;型号: | MAX1403EVL11 |
厂家: | MAXIM INTEGRATED PRODUCTS |
描述: | Easy to Configure |
文件: | 总20页 (文件大小:1550K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
19-1490; Rev 0; 5/99
MAX1 4 0 3 EV S ys t e m
Evluates:/MAX1403
Ge n e ra l De s c rip t io n
Fe a t u re s
♦ Easy to Configure
The MAX1403 evaluation system (EV system) is a com-
plete, multichannel data-acquisition system consisting of
a MAX1403 evaluation kit (EV kit) and a Maxim 68HC11
microcontroller (µC) module. The MAX1403 is a low-
power, multichannel, serial-output analog-to-digital con-
verter (ADC). Windows 95/98™-compatible software pro-
vides a handy user interface to exercise the MAX1403’s
features. Source code in C++ and 68HC11 assembly lan-
guage is provided for the low-level portion of the software.
♦ Collects Up to 8192 Samples at Full Speed
♦ Complete Evaluation System
♦ Proven PC Board Layout
♦ Fully Assembled and Tested
Ord e rin g In fo rm a t io n
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 cus-
tom use in other µC-based systems.
PART
TEMP. RANGE
0°C to +70°C
0°C to +70°C
INTERFACE TYPE
User-Supplied
MAX1403EVKIT
MAX1403EVL11
Windows Software
Note: The MAX1403 software can be used only with the com-
plete evaluation system (MAX1403EVL11), which includes the
68L11DMODULE together with the MAX1403EVKIT.
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.
MAX1 4 0 3 EV Kit
Co m p o n e n t Lis t
MAX1 4 0 3 S t a n d -Alo n e EV Kit
The MAX1403 EV kit provides a proven PC board layout
to facilitate evaluation of the MAX1403 with user-provid-
ed 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.
DESIGNATION QTY
DESCRIPTION
100pF ceramic capacitors (1206)
0.1µF ceramic capacitors (1206)
Not installed
C3–C8
C9, C10, C11
C12, C13
6
3
0
2.2µF aluminum electrolytic radial-
leaded capacitor
MAX1 4 0 3 EV S ys t e m
The MAX1403 EV system operates from a user-sup-
plied +5V to +12V DC power supply.
C15
1
J1
J2
1
1
0
6
2
0
0
1
2 x 20 right-angle socket
Female SMA connector
Not installed
JU1–JU8
R1–R6
R7, R8
R9
MAX1 4 0 3 EV S ys t e m
Co m p o n e n t Lis t
100Ω, 5% resistors (1206)
10Ω, 5% resistors (1206)
Not installed
PART
QTY
DESCRIPTION
MAX1403 Evaluation Kit
68HC11 µC Module
MAX1403EVKIT
68L11DMODULE
1
1
R10
Not installed
U1
Maxim MAX1403CAI
Maxim MAX6520EUR
(SOT23 voltage reference, 1.2V,
20ppm/°C max)
U2
1
2.4576MHz ceramic resonator
Murata CST2.45MGW040
Y1
1
1
1
3" x 4" PC board
MAX1403 evaluation kit
None
None
3 1/2" software disk
MAX1403 evaluation kit
Maxim 68HC11 module monitor, ROM
Version 1.1 (Version 1.0 ROM will not
work with this EV kit.)
None
1
Windows 95/98 is a trademark of Microsoft Corp.
________________________________________________________________ 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.
MAX1 4 0 3 EV S ys t e m
MAX1 4 0 3 EV Kit File s
_________________________Qu ic k S t a rt
Win d o w s Ap p lic a t io n P ro g ra m File s
Re c o m m e n d e d Eq u ip m e n t
Obtain the following equipment before you begin:
FILE
DESCRIPTION
• A DC power supply that generates +5VDC to +12VDC
at 30mA to 50mA
Application program that runs under
Windows 95/98
MAX1403.EXE
MAX1403.HLP
KIT1403.L11
MAX1403.INI
• An IBM PC-compatible computer running Windows
95/98
Help file
Software loaded into 68HC11 microcon-
troller
• A spare serial communications port, preferably a 9-
pin plug
Program settings file
• A serial cable to connect the computer’s serial port
to the Maxim 68HC11 Module
Ex a m p le S o u rc e Co d e File s
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.
FILE
DESCRIPTION
Source code module for driving the
2) Carefully connect the boards by aligning the 40-pin
header of the MAX1403 EV kit with the 40-pin con-
nector of the 68HC11 module. Gently press them
together. The two boards should be flush against
one another.
MAX1403, provided for reference. Includes
definitions of the register names and low-
level access routines. Compiled with
Borland C++ 4.52. Maxim holds the copy-
right but allows customers to adapt the pro-
gram for their own use without charge.
MAX1403.CPP
3) Connect the DC power source to the µC module at
termina l b loc k J 2, loc a te d ne xt to the ON/OFF
s witc h, a long the top e d g e of the µC mod ule .
Observe the polarity marked on the board.
Header file for MAX1403.CPP, provided for
reference.
MAX1403.H
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.
6 8 HC1 6 S o u rc e Co d e File s
FILE
DESCRIPTION
Evluates:/MAX1403
Main source code for the KIT1403.L11 pro-
gram, provided for reference. Maxim holds
the copyright but allows customers to
adapt the program for their own use without
charge.
KIT1403.ASM
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
s oftwa re e va lua te s b oth the MAX1403 a nd the
MAX1401.
Source code defining the program inter-
face with the Maxim 68HC11 Module ROM
(Rev. 1.1).
EVKIT.ASM
In s t a ll/Un in s t a ll P ro g ra m File s
6) Start the MAX1403 program by opening its icon in
the Start Menu.
FILE
DESCRIPTION
INSTALL.EXE
UNINST.INI
Installs the EV kit files on your computer.
Database for uninstall program.
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.
Removes the EV kit files from your comput-
UNMAXIM.EXE er. This file is automatically copied to
C:\WINDOWS during installation.
2
_______________________________________________________________________________________
MAX1 4 0 3 EV S ys t e m
Evluates:/MAX1403
8) When the software successfully establishes commu-
nication with the EV kit board, you will see a configu-
ration tool and some other windows. Verify that the
CLKIN and Reference Voltage settings are correct.
Close or minimize this dialog box.
The EV kit s oftwa re a s s ume s tha t CALOFF+ a nd
CALOFF- are grounded so that CALOFF measures 0V.
Similarly, the software assumes that CALGAIN+ is con-
ne c te d to REFIN+ a nd CALGAIN- is c onne c te d to
REFIN- so that CALGAIN measures the reference volt-
age. These two points calibrate the code-to-voltage
translation function performed in the software.
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.
The MAX1403 automatically triggers its measurements,
unless the FSYNC control bit is set. The EV kit software
communicates with the MAX1403 at intervals deter-
mined 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.
Up g ra d in g t h e 6 8 HC1 1 Mo d u le
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.
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 soft-
ware.
The Rev. 1.1 ROM is a 28-pin DIP that comes with the
EV kit. If it wa s omitte d , c onta c t the fa c tory 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 per-
form the installation at one sitting.
Co n fig u ra t io n To o l
The Configuration Tool controls parameters that apply
to the e ntire EV kit. Like the othe r wind ows , 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.
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 pack-
aging.
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.
De t a ile d De s c rip t io n
_________________________o f S o ft w a re
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.
Ma in Dis p la y
The main display shows the calculated input voltage
a nd ra w A/D outp ut c od e for e a c h a c tive c ha nne l.
Although there are nine input channels, only certain
configurations are allowed.
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.
Se le c t a ny s ing le c ha nne l or one of the s c a nning
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.
_______________________________________________________________________________________
3
MAX1 4 0 3 EV S ys t e m
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 accu-
racy. 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.
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 sam-
ples 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.
Ca lib ra t io n To o l
The MAX1403 EV kit software can average the mea-
surements 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 CAL-
GAIN inputs are externally connected to the reference
voltage (VREF). View the calibration tool by selecting it
from the Show menu.
Re g is t e r Dis p la y To o l
This tool displays all of the internal registers of the
MAX1403. Mod ify a ny b it va lue b y c he c king or
unchecking its box. (The START bit and the zero bits in
the Special Function register (SFR) cannot be modi-
fied). The Read All Registers button causes the soft-
ware to read all of the MAX1403’s registers. (Not func-
tional when the MDOUT or FULLPD bit is set.) Refer to
Table 1 for a guide to register bit functions.
The software automatically disables calibration if either
of the c a lib ra tion c ha nne ls re p orts a c od e of 0 or
262143. This is to prevent erroneous calibration when
using a transfer function that does not include both 0V
and VREF.
Communications Register (COMMS)
Setting the FSYNC control bit inhibits the MAX1403
from p e rforming its s e lf-time d me a s ure me nts . 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.
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.
Setting the STDBY bit places the part in low-power
standby mode. The serial interface and the CLK oscilla-
tor continue to operate. The part can be restored to
normal operation by clearing the STDBY bit.
Evluates:/MAX1403
The EV kit software assumes that all three transfer func-
tion registers are set to the same value.
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.
This calibration affects only the displayed voltage, not
the ra w c od e numb e rs . The a ve ra g e CALOFF a nd
CALGAIN code values are used as the endpoints of a
linear interpolation, with CALOFF measuring 0V and
CALGAIN measuring VREF.
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.
The linear interpolation formula is as follows:
VREF(Code −CALOFFcode)
Voltage =
(CALGAINcode −CALOFFcode)PGAgain
Transfer Function Registers (TF1, TF2, TF3)
The three transfer function registers (TF1, TF2, TF3) con-
trol how input voltage is mapped to code values. The
transfer function registers control a programmable-gain
amplifier (PGA) and an offset-correction DAC.
Note: Whe n us ing the c a lib ra tion tool with the
MAX1403 in buffered mode, CALOFF+ and CALOFF-
should be disconnected from GND and connected
instead to REFIN+ so that they remain within the speci-
fied input range.
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-
S a m p lin g To o l
To sample data at full speed, select Sample from the
main display menu, make your selections, and click on
4
_______________________________________________________________________________________
MAX1 4 0 3 EV S ys t e m
Evluates:/MAX1403
cessing gain, reducing the full-scale voltage range by a
factor of 1, 2, 4, 8, 16, 32, 64, or 128. Finally, the offset-
correction DAC offsets the voltage range by up to ±7/6
of the full-scale voltage range.
C = 100pF). When scanning between channels, the RC
filter’s settling time may increase the acquisition time
required for full accuracy.
Eva lu a t in g t h e MAX1 4 0 1
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.
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.
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.
Me a s u rin g S u p p ly Cu rre n t
Supply current can be estimated by measuring the volt-
age 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.
De t a ile d De s c rip t io n
________________________o f Ha rd w a re
U1, the MAX1403, is a multichannel, high-resolution
A/D converter (refer to the MAX1403 data sheet). U2,
the MAX6520, is a 1.2V re fe re nc e (re fe r 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 digi-
tal power supply. The analog supply comes through fil-
ter R7/C10.
Tro u b le s h o o t in g
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-pow-
ered DVMs with battery-powered DVMs.
In p u t Filt e rin g
The EV kit has an RC filter on each input with a time
constant of approximately 0.01µs = 10ns (R = 100Ω,
_______________________________________________________________________________________
5
MAX1 4 0 3 EV S ys t e m
Table 1. Guide to Register Bit Functions
REGISTER
BIT NAME
0/DRDY
RS2–RS0
R/W
DESCRIPTION
Start bit is zero; DIN pin must be 1 when idle.
COMMS
Register select for subsequent operation
Selects subsequent read or write operation
Causes software reset when set to 1
Activates standby power-down mode when set to 1
Inhibits the A/D converter when set to 1
Selects the active channel
RESET
STDBY
FSYNC
A1
GS1
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
1
3
FAST
SCAN
M1
Selects SINC filter instead of SINC
GS2
Enables the scanning sequences
Enables the CalGain channel
Enables the CalOff channel
Enables the input buffers
M0
BUFF
DIFF
Selects differential input pairs
BOUT
IOUT
X2CLK
MDOUT
FULLPD
Enables the transducer burn-out test currents
Enables the OUT1 and OUT2 current sources (MAX1403 only)
Selects the CLKIN frequency
Evluates:/MAX1403
SFR
TF1, 2, 3
DATA
Changes the DOUT and INT pins to provide raw modulator output
Activates full power-down mode. Use hardware reset to restore normal operation.
All other bits in SFR must be zero
G2–G0
U/B
Selects the PGA Gain
Selects unipolar or bipolar coding
D3–D0
D17–D0
DS1
Selects the offset correction DAC code; D3 = sign, D2–D0 = magnitude
Raw code value
Value of the DS1 input pin (MAX1403 only)
Value of the DS0 input pin (MAX1403 only)
Channel identification tag
DS0
CID2–CID0
6
______________________________________________________________________________________
MAX1 4 0 3 EV S ys t e m
Evluates:/MAX1403
Table 2. Jumper Functions
JUMPER
STATE
Closed*
Open
FUNCTION
Use CalGain inputs for gain calibration (CALGAIN+ = REFIN+)
JU1
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)
Closed*
Open
JU2
JU3
JU4
JU5
Closed*
Open
Closed*
Open
Closed*
Open
REFIN+ and REFIN- must be driven by an external reference
Connects pin 5 to pin 7
Closed
Open
MAX1403: pin 5 = digital input DS1, pin 7 = current source
MAX1401: normal operation
JU6
Disconnects pin 5 from pin 7
MAX1403: pin 5 = digital input DS1, pin 7 = current source
MAX1401: insert filter between mux and A/D
Connects pin 6 to pin 8
Closed
Open
MAX1403: pin 6 = digital input DS0, pin 8 = current source
MAX1401: normal operation
JU7
JU8
Disconnects pin 6 from pin 8
MAX1403: pin 6 = digital input DS0, pin 8 = current source
MAX1401: insert filter between mux and A/D
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
JU1
STATE
Closed*
Closed*
Closed*
Closed*
Closed*
FUNCTION
Use CalGain inputs for gain calibration (CALGAIN+ = REFIN+)
Use CalGain inputs for gain calibration (CALGAIN- = REFIN-)
Use CalOff inputs for offset calibration (CALOFF+ = GND)
Use CalOff inputs for offset calibration (CALOFF- = GND)
Use on-board reference U2 (REFIN- = GND)
JU2
JU3
JU4
JU5
Disconnects pin 5 from pin 7
JU6
Open
MAX1403: pin 5 = digital input DS1, pin 7 = current source
MAX1401: insert filter between mux and A/D
Disconnects pin 6 from pin 8
JU7
JU8
Open
MAX1403: pin 6 = digital input DS0, pin 8 = current source
MAX1401: insert filter between mux and A/D
Closed*
Use on-board reference U2 (REFIN+ = 1.2V)
* Default trace on top layer of PC board
_______________________________________________________________________________________
7
MAX1 4 0 3 EV S ys t e m
2U
AMX6502
Evluates:/MAX1403
1
AMX1430
M(AX410)
Figure 1. MAX1403 EV Kit Schematic
8
_______________________________________________________________________________________
MAX1 4 0 3 EV S ys t e m
Evluates:/MAX1403
1.0"
Figure 2. MAX1403 EV Kit Component Placement Guide—Component Side
_______________________________________________________________________________________
9
MAX1 4 0 3 EV S ys t e m
1.0"
Evluates:/MAX1403
Figure 3. MAX1403 EV Kit PC Board Layout—Component Side
10 ______________________________________________________________________________________
MAX1 4 0 3 EV S ys t e m
Evluates:/MAX1403
1.0"
Figure 4. MAX1403 EV Kit PC Board Layout—Solder Side
______________________________________________________________________________________ 11
MAX1 4 0 3 EV S ys t e m
NOTES
Evluates:/MAX1403
12 ______________________________________________________________________________________
6 8 L1 1 D Mo d u le
68L1DModule
_______________Ge n e ra l De s c rip t io n
____________________Co m p o n e n t Lis t
The 68L11D module is an assembled and tested PC
board intended for use with Maxim’s low-voltage data-
acquisition evaluation kits (EV kits). The module uses
Motorola’s MC68L11D0FN2 microcontroller (µC) to col-
lect 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.
DESIGNATION QTY
DESCRIPTION
C1, C2
C3
2
1
22pF ceramic capacitors
0.01µF ceramic capacitor
0.1µF ceramic capacitors
C4–C9,
C12–C18
13
C10, C11
D1
2
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
22µF, 20V tantalum capacitors
1N4001 diode
Maxim’s 68L11D module allows customers to evaluate
selected Maxim products. It is not intended to be a
mic rop roc e s s or d e ve lop me nt p la tform, a nd Ma xim
does not support such use.
J1
40-pin, right-angle header
2-circuit terminal block
DB9 right-angle socket
Open
J2
____________________Ge t t in g S t a rt e d
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
J3
JU1, JU2
LED1
R1
Light-emitting diode
10MΩ, 5% resistor
the entire 2.5V to 5V V
power-supply adjustment
DD
ra ng e . Ve rify c orre c t op e ra tion us ing the following
procedures:
R2
100kΩ potentiometer
274kΩ, 1% resistor
133kΩ, 1% resistor
200Ω, 5% resistor
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.
R3
R4
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.
R5
R6
10kΩ SIP resistor pack, pin 1 common
Slide switch
SW1
SW2
U1
Momentary push-button switch
Motorola MC68L11D0FN2
Maxim MAX3232CSE
74HC00
3) Sta rt the e va lua tion kit s oftwa re 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 soft-
ware will be in terminal-emulation mode. (If using a
g e ne ric te rmina l-e mula tion p rog ra m ins te a d 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.)
U2
U3
U4
Maxim MAX667CSA
32k x 8 static RAM 28-pin socket
Motorola MCM6306DJ15
U5
1
4) Adjust trim potentiometer R2 for the desired V
DD
U10
U6
1
1
1
1
1
1
1
28-pin socket
74HCT245
supply voltage. Measure V
between test point
DD
TP1 and ground. The mounting hole next to R2 is
grounded.
U7
Maxim MAX708RCSA
74HC573
5) To verify correct system operation, press the ESC
key, type a capital “T”, and then select the count-
down memory test. If the memory test fails or any
U8
U9
74HC139
other malfunction is reported, the V voltage is too
DD
U10
Y1
3V, 8k x 8 ROM
8MHz crystal
low; increase V and repeat from step 4.
DD
6) Turn the power switch off and connect the µC board
to an appropriate Maxim EV kit board.
________________________________________________________________ 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.
6 8 L1 1 D Mo d u le
The 20 x 2-pin header (J1) connects the 68L11D mod-
ule 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 pro-
duce unpredictable results.
_______________De t a ile d De s c rip t io n
P o w e r Re q u ire m e n t s
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 typ-
ically 20mA plus the current drawn by the evaluation kit
(EV kit).
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.
The V
supply is set by U4, a MAX667 low-dropout
DD
S o ft w a re
All s oftwa re is s up p lie d on a d is k with the EV kit.
Software operating instructions are included in the EV
kit manual.
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.
68L1DModule
S e ria l Co m m u n ic a t io n s
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.
6 8 L1 1 D Mic ro c o n t ro lle r (µC)
Mo d u le Ha rd w a re
U1 is Motorola’s 68L11D µC. Contact Motorola for µC
information, development, and support.
A MAX708R supervisory circuit on the module monitors
the V
logic supply, generates the power-on reset,
DD
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.
Table 1. Serial Communications Port J3
The module provides 32kbytes of external CMOS static
RAM (U5).
PIN
NAME
FUNCTION
1
DCD
Handshake; hard-wired to DTR and DSR
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
a nd write s trob e s , four c hip s e le c ts , four a d d re s s
LSB's, and eight data bits. Table 3 lists the address
ranges for each of the memory-mapped elements on
the 68L11D module.
RS-232-compatible data output from
68L11D module
2
3
RXD
TXD
RS-232-compatible data input to
68L11D module
4
5
6
7
8
9
DTR
GND
DSR
RTS
Handshake; hard-wired to DCD and DSR
Signal ground connection
The MAX3232 is a 3V-powered, RS-232 interface volt-
age-level shifter. Its built-in charge pump uses external
capacitors to generate the output voltages necessary
to drive RS-232 lines.
Handshake; hard-wired to DCD and DTR
Handshake; hard-wired to CTS
Handshake; hard-wired to RTS
Unused
CTS
None
2
_______________________________________________________________________________________
6 8 L1 1 D Mo d u le
68L1DModule
Table 2. 40-Pin Data-Connector Signals
Table 3. 68L11D Module Memory Map
PIN
1–4
5, 6
NAME
GND
V++
FUNCTION
ADDRESS RANGE
FUNCTION
(HEX)
Ground
Unregulated input voltage
from on-board MAX667
0000-7FFF
8000-8FFF
9000-9FFF
A000-AFFF
B000-BFFF
C000-C03F
C040-C0FF
C100-CFFF
D000-D03F
D040-DFFF
E000-FFFF
User RAM area (U5)
External chip-select 0 (J1 pin 11)
External chip-select 1 (J1 pin 12)
External chip-select 2 (J1 pin 13)
External chip-select 3 (J1 pin 14)
Unused
V
DD
7, 8
V
DD
regulator
9
10
11
12
13
14
15
16
17
18
19
20–26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
Read strobe
RD
WR
Write strobe
Chip select for 8000-8FFF
Chip select for 9000-9FFF
Chip select for A000-AFFF
Chip select for B000-BFFF
Address bit 0 (LSB)
Address bit 1
CS0
CS1
CS2
Internal RAM (U1)
Unused
CS3
ADDR0
Internal register area (U1)
Unused
ADDR1
ADDR2
ADDR3
DB0
Boot ROM (U10)
Address bit 2
Address bit 3
Data bus bit 0 (LSB)
Data bus bits 1–7
General I/O port bit 0 (LSB)
General I/O port
DB1–DB7
PA0/IC3
PA1/IC2
PA2/IC1
PA3/IC4/OC5
PA4/OC4
PA5/OC3
PA6/OC2
PA7/OC1/PAI
MISO
General I/O port
General I/O port
General I/O port
General I/O port
General I/O port
General I/O port MSB
SPI master-in, slave-out
SPI master-out, slave-in
SPI serial clock
MOSI
SCK
RESERVED
E
Reserved for factory use
System E-clock output
SPI slave-select input
SS
_______________________________________________________________________________________
3
6 8 L1 1 D Mo d u le
J2
VPREREG
D1
1N4001
VDD
U4
SW1
C10
22µF
20V
C11
22µF
20V
8
7
6
5
1
DD MAX667 VIN
R3
274k
1%
2
3
4
VOUT
LBI
LBO
VSET
SHDN
VDD
VDD
1.255V
R2
100k
C16
GND
C13
C12
16
R4
133k
1%
0.1µF
V
C14
CC
VDD
1
3
4
5
0.1µF
0.1µF
2
6
J3-8
CTS
C1+
C1-
C2+
C2-
V+
U2
C15
68L1DModule
0.1µF
MAX3232
V-
J3-7
RTS
C3
0.01µF
C4
0.1µF
0.1µF
11
10
12
14
7
J3-2
RXD
T1
TXD
VDD
V
CC
J3-3
TXD
T2
R1
U7
J3-4
DTR
MAX708R
13
1
4
5
6
8
7
RXD
MR
PFI
PFO
J3-6
DSR
SW2
RESET
NC
RESET
RESET
9
8
J3-1
DCD
R2
GND
RESET
15
J3-5
GND
GND
3
J3-9
RI
30
29
28
27
26
25
24
23
3
4
5
6
7
8
9
10
13
PA0/IN3
PA1/IN2
PA2/IN1
PA0
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
D0
D1
D2
D3
D4
D5
D6
D7
AS
U1
PA1
PA2
PA3
PA4
PA5
PA6
PA7
MC68L11D0FN2
PA3/IN4/OUT5
PA4/OUT4
PA5/OUT3
PA6/OUT2
POWER CONNECTIONS
GND VDD
VDD
C17
0.1µF
PA7/OUT1/PULSE ACCIN
U1 1, 2
22
PD6/AS
16
17
18
19
20
21
RXD
TXD
MISO
MOSI
SCK
SS
PD0/RXD
PD1/TXD
PD2/MISO
PD3/MOSI
PD4/SCK
PD5/SS
12
39
38
37
36
35
34
33
32
PD7/R/W
PB0
R/W
A8
A9
A10
A11
A12
A13
A14
A15
PB1
PB2
PB3
PB4
PB5
PB6
PB7
C2
22pF
14
11
15
RESET
XIRQ
IRQ
RESET
XIRQ/VPP
IRQ/CE
Y1
8.00MHz
R1
10M
44
43
42
XTAL
EXTAL
E
41
40
MODA/LIR
MODB/VSTBY
MODA
MODB
E
C1
22pF
Figure 1. 68L11D Module Schematic Diagram
_______________________________________________________________________________________
4
6 8 L1 1 D Mo d u le
68L1DModule
U9A
74HC139
2
3
4
5
6
7
11
10
9
A0
A1
Y0
I/0
I/1
I/2
I/3
I/4
I/5
I/6
I/7
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A14
A15
A0
A1
A2
A3
A4
A5
A6
A7
A8
U5
12
13
15
16
17
18
19
8
Y1
Y2
Y3
32 x 8 STATIC RAM
7
6
IOBUFFER
CS-11XXX
5
1
4
3
E
GND
VDD
VDD
25
24
21
23
2
A9
U9B
74HC139
A10
A11
A12
A13
A14
C5
0.1µF
C7
0.1µF
12
11
10
9
14
13
26
1
A0
A1
Y0
A12
A13
CS8XXX
CS9XXX
CSAXXX
CSBXXX
Y1
Y2
Y3
20
22
27
A15
RD
WR
CS
OE
WE
15
E
IOBUFFER
1
2
11
12
13
15
16
17
18
19
10
9
8
7
6
5
4
3
25
24
3
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A0
A1
A2
A3
A4
A5
A6
A7
A8
U10
U3A
R/W
R/W
27LV64 8k x 8 ROM
74HC00
4
5
R/W
E
6
8
VDD
VDD
RD
U3B
74HC00
A9
21
23
2
9
C6
0.1µF
C8
0.1µF
A10
A11
A12
A13
R/W
E
WR
U3C
10
26
74HC00
27
VDD
VDD
PGM
VPP
OE
1
22
20
12
13
E
11
DATA-XX1X
U3D
A13
CS-11XXX
CE
74HC00
POWER CONNECTIONS
VDD GND
1
11
OE
C
GND
AS
U8
74HC573
U3
U5
U8
U9
14
28
20
16
7
VDD
19
2
3
4
5
6
7
8
9
Q0
A0
A1
A2
A3
A4
A5
A6
A7
D0
14
10
8
D0
D1
D2
D3
D4
D5
D6
D7
18
17
16
15
14
13
12
Q1
Q2
Q3
Q4
Q5
Q6
Q7
D1
D2
D3
D4
D5
D6
D7
C18
0.1µF
U10 28
14
Figure 1. 68L11D Module Schematic Diagram (continued)
_______________________________________________________________________________________
5
6 8 L1 1 D Mo d u le
VDD
GND
GND
J1-1
J1-2
J1-4
GND
R5
200Ω
J1-3
GND
GND
VPREREG
VDD
J1-5
J1-6
VPREREG
VDD
LED1
J1-7
J1-8
19
RD
J1-9
J1-10
J1-12
J1-14
J1-16
J1-18
J1-20
J1-22
J1-24
J1-26
J1-28
J1-30
J1-32
J1-34
J1-36
J1-38
J1-40
WR
IOBUFFER
RD
OE
DIR
74HCT245
1
U6
CS8XXX
CSAXXX
A0
J1-11
J1-13
J1-15
J1-17
J1-19
J1-21
J1-23
J1-25
J1-27
J1-29
J1-31
J1-33
J1-35
J1-37
J1-39
CS9XXX
CSBXXX
A1
18
17
16
15
14
13
12
11
2
3
4
5
6
7
8
9
B1
EXTD0
EXTD1
EXTD2
EXTD3
EXTD4
EXTD5
EXTD6
EXTD7
A1
A2
A3
A4
A5
A6
A7
A8
D0
D1
D2
D3
D4
D5
D6
D7
B2
B3
B4
B5
B6
B7
B8
A2
A3
68L1DModule
EXTD0
EXTD2
EXTD4
EXTD6
PA0/IN3
PA2/IN1
PA4/OUT4
PA6/OUT2
MISO
EXTD1
EXTD3
EXTD5
VDD
C9
0.1µF
EXTD7
VDD GND
20 10
U6
PA1/IN2
PA3/IN4/OUT5
PA5/OUT3
PA7/OUT1/PULSE ACCIN
VDD
VDD
MOSI
RESERVED
R6G
10k
8
R6A
10k
SCK
R6F
10k
SS
7
2
E
XIRQ
IRQ
VDD
VDD
SS
R6E
10k
R6B
10k
6
3
R6H
10k
R6C
10k
JU1
JU2
9
4
5
MODA
MODA
MODB
R6I
10k
R6D
10k
10
MODB
Figure 1. 68L11D Module Schematic Diagram (continued)
6
_______________________________________________________________________________________
6 8 L1 1 D Mo d u le
68L1DModule
Figure 2. 68L11D Module Component Placement Guide
Figure 3. 68L11D Module PC Board Layout—Component Side
_______________________________________________________________________________________
7
6 8 L1 1 D Mo d u le
68L1DModule
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 _____________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 4 0 8 -7 3 7 -7 6 0 0
© 1999 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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