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19-0349; Rev 1; 3/95
MAX194 Evaluation System/Evaluation Kit
_______________General Description
The MAX194 Evaluation System (MAX194EVC16-DIP) includes the MAX194 evaluation kit and Maxim's 68HC16 module. Evaluation software supplied with the kit demonstrates the use of the MAX194 (or the MAX195) with Motorola's high-speed QSPI serial interface. Complete source code is included. The EV system requires an IBM PC with a serial port and a 5 1/4" disk drive. The stand-alone MAX194 Evaluation Kit (MAX194 EVKIT-DIP) is an assembled and tested PC board that embodies the standard application circuit. Separate power, digital, and analog ground planes minimize noise. Jumpers allow several operating modes. The board generates its own interface timing signals, or can be connected to a user-provided serial interface.
____________________________Features
o Proven PC Board Layout o Complete Source Code Provided o Shutdown-Mode Evaluation o High-Speed Serial Interface o Convenient Test Points Provided On-Board o Operates from a Single 9V to 15V DC Power Supply o Evaluates Both the 14-Bit MAX194 and the 16-Bit MAX195
Evaluates: MAX194/MAX195
______________Ordering Information
PART MAX194EVC16-DIP MAX194EVKIT-DIP 68HC16MODULE TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C BOARD TYPE Through-Hole Through-Hole Through-Hole
___________________________________________________________________EV System
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68HC16 MODULE Note: PC board labeled MAX195 for both MAX194 EV kit and MAX195 EV kit.
________________________________________________________________ Maxim Integrated Products
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MAX194/MAX195 EV BOARD
1
Call toll free 1-800-998-8800 for free samples or literature.
MAX194 Evaluation System/Evaluation Kit Evaluates: MAX194/MAX195
________EV System Component List
QUANTITY 1 1 DESCRIPTION MAX194 Evaluation Kit (MAX194EVKIT-DIP) 68HC16 C Module (68HC16MODULE)
___MAX194 EV System Quick Start
This section applies only to the use of the MAX194 EV kit with the 68HC16 module. 1) Copy the files from the distribution disk to your hard disk. Store the MAX194 EV kit software in its own directory. 2) Carefully align the 40-pin header of the MAX194 EV kit with the 40-pin connector of the C module. Gently press them together. The two boards should be flush against each other. Note: The MAX194 EV kit is not supported by the 80C32 module. 3) Make sure the jumpers are configured in accordance with Table 1. 4) Connect a 9V to 15V DC power source to the C module, using a small screwdriver. The terminal block is located next to the on/off switch, in the upper right corner of the C module. Plus and minus are marked on the board. 5) Connect a cable from the computer's serial port to the C module. If using a 9-pin serial port, use a straight-through 9-pin female-to-male cable. If the
available serial port uses a 25-pin connector, use a standard 25-pin to 9-pin adapter. 6) To start up the MAX194 software on the IBM PC, set the current directory to match the directory where the Maxim software is stored, and then type the program name "MAX194". 7) The program will ask which serial port is connected to the C module. Press the space bar until the correct port is highlighted, then press ENTER. The MAX194 program will switch to terminal-emulation mode. 8) At this point, apply power to the 68HC16 module. The LED should light, and within 5 seconds the program will display a logon banner. Note that the LED is a status indicator, not a power light. It flashes to indicate module readiness. 9) To download and run the RAM resident code on the C module, press ALT+L (that is, hold down the ALT key as you strike the L key). The program prompts for the file name. Press the ENTER key to download and run the file KIT194.S19 on the 68HC16 module. The KIT194.S19 RAM resident program offers a menu of commands listed in Table 2. To evaluate the MAX195, replace U1 with the MAX195.
Table 1. Jumper Configuration when Used with 68HC16 Module
JUMPER JU1 JU3 JU4 JU5 JU6 STATE Closed QSPI QSPI QSPI Open FUNCTION Ground the SCLK pin Conversion clock comes from QSPI clock Chip-select is driven by QSPI PCS0 Conversion start is driven by QSPI PCS0 Open = Normal Operation. Closed = Reset; do not close this jumper when using the C module, because the C drives the reset pin. 68HC16 module selects bipolar/ unipolar/shutdown modes
Table 2. List of Commands Available in KIT194.S19
COMMAND ? R -- O ! B U H D L T S FUNCTION List available commands. Read the MAX194. Perform continuous conversions. Oscilloscope demonstration--observe system timing relationships by operating the MAX194 at full speed without processing data. Reset the MAX194. Select bipolar mode. Select unipolar mode. Select hexadecimal output. Select decimal output. Toggle low-power mode on/off. Set power-up delay and sleep time. Collect a fixed number of samples.
JU7
AUTO
2
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MAX194 Evaluation System/Evaluation Kit
Stand-Alone EV Kit ____________________Component List
DESIGNATION C1, C2, C4, C5, C19, C20, C23-C26, C29 C3 C6, C7 C8-C11, C13-C16, C21 C12, C18, C27 C17, C171 C22 D1, D2 J1 J2 JU1, JU6 JU3, JU7 JU4, JU5 R1, R2 R3, R8 R4, R41 R5, R51 R6, R10, R11, R13, R61 R7 R9 U1 U2 U3 U4 U5, U8 U6 U7 QTY 11 1 2 9 3 2 1 2 1 1 2 2 2 2 2 2 2 5 1 1 1 1 1 1 2 1 1 DESCRIPTION 0.1F ceramic capacitors 1F ceramic capacitor 15F, 20V low-ESR capacitors Sanyo OS-CON 20SA14 10F, 25V tantalum capacitors 100F, 25V electrolytic capacitors 0.01F ceramic capacitors 47F low-ESR capacitor Sanyo OS-CON 6SA47M 1N5819 Schottky diodes 2x20 female data connector 10-pin header 2-pin headers 3-way headers 3-pin headers 10, 5% resistors 680, 5% resistors 22, 5% resistors 47k, 5% resistors 1k, 5% resistors 10k, 5% resistor 10M, 5% resistor Maxim MAX194 Maxim MAX874 79L05 negative linear regulator Optional crystal oscillator Maxim MAX400 78L05 positive linear regulator ICL7662 inverter JU7 UNI JU5 JU6 CONT Open
Stand-Alone MAX194 _________________EV Kit Quick Start
This section applies only to the use of the MAX194 EV kit by itself, without the C module. 1) Make sure the jumpers are configured in accordance with Table 3. 2) Connect the oscilloscope's channel A probe to the EOC test point on header J2, and the channel B probe to the DOUT test point. Ground the scope probes to the DGND test point or to the GND power pad. Trigger on the positive edge of channel A. Set the time base to 2s per division, and set the vertical gain to 2V per division. 3) Apply +12V DC to the terminals labeled +12V and GROUND. The board draws less than 30mA of supply current. 4) Momentarily close JU6 to reset the MAX194 EV kit. Leave JU6 open for normal operation. 5) Apply a 0V to 4V signal source between the terminals labeled INPUT+ and INPUT-. The conversion codes may be observed on the oscilloscope's channel A. See the appropriate data sheet for timing information.
Evaluates: MAX194/MAX195
Table 3. Jumper Configuration for StandAlone MAX194 EV Kit
JUMPER JU1 JU3 JU4 STATE Closed OSC GND FUNCTION Ground the SCLK pin Conversion clock comes from crystal oscillator module Tie CS to GND, enabling data output on DOUT Tie CONV to EOC, continuous-conversion mode Open = Normal Operation Closed = Reset Select unipolar mode
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MAX194 Evaluation System/Evaluation Kit Evaluates: MAX194/MAX195
__Detailed Description of Software
EPROM Resident Program
A small bootstrap program is stored in the EPROM located on the 68HC16 board. The EPROM resident program initializes the 68HC16, tests the static RAM, configures the chip-select logic, establishes serial communications with the host, and downloads program KIT194 into RAM. It starts operating on power-up or whenever the RESET button is pressed. After RESET, it tests the RAM, then waits to receive a serial character on its serial port before transmitting its identification banner. name already exists, the old file will be erased. To close the file, press ALT+C. The log file will contain the complete text of the terminal session from the time the file is opened until it is closed.
Using the QSPI to Read the MAX194
The 68HC16 module uses its Queued Serial Peripheral Interface (QSPI) in master mode to read the MAX194. The MAX194 EV kit software uses the algorithm described below. Refer to the example program of Listing 1, which assigns QSPI entries 0 and 1 and programmable chip-select PCS0 to the MAX194. Note: This interface scheme requires that the QSPI clock be active during the MAX194 reset (see Reset and Calibration Procedure section). 1) Initialize the QSPI parameters as follows:
PARAMETER SPBR CPOL CPHA VALUE 5 0 1 EXPLANATION 1.68MHz serial clock Serial clock is low when idle CPOL CPHA, data valid on falling clock edge Ten bits per QSPI transfer. Use two consecutive QSPI transfers to read the MAX194. Delay 119ns between CS and first clock in the first QSPI transfer to satisfy MAX194 tDA. Control RAM for first QSPI transfer: CONT = 1, BITSE = 1, DTL = 0, DSCK = 1, PSC0 = 0 Control RAM for second QSPI transfer: CONT = 0, BITSE = 1, DTL = 0, DSCK = 0, PSC0 = 0 Index of first queue entry to execute Index of last valid queue entry
RAM Resident Program
KIT194.S19 is a 68HC16 RAM-resident program that is transferred from disk to the static RAM on the 68HC16 module. When the KIT194 program is running, it offers the commands listed in Table 2.
Personal Computer Program
MAX194.EXE, which runs on an IBM-compatible computer, is a terminal program that establishes communication with the 68HC16 module and allows the user to download and run the Maxim-provided RAM resident program. The serial communication baud rate is initiated at 1200 baud (default setting) to ensure proper operation with basic systems. The MAX194.EXE program provides several commands that are associated with the host computer. These commands are listed in Table 4. The MAX194.EXE program can store the text of a terminal session in a log file. To begin recording the terminal session, press ALT+O [the letter O]. The program will ask for a file name. Press ENTER to accept the default file name, or type in a different name. If a file with that
BITS
$0A
DSCKL
2
COMD.0
$D0
COMD.1
$40
Table 4. Commands Available in MAX194.EXE Terminal Program
KEY ALT+L ALT+X ALT+P ALT+R ALT+O ALT+C ALT+B ALT+1 ALT+4 ALT+9 ALT+2 4 Exit to DOS. Change port (COM1, COM2). Send RESET command to 68HC16. Open a log file. Close the log file. Display baud rate menu. 1200 baud 4800 baud 9600 baud 19200 baud COMMAND Load and run resident code on 68HC16.
NEWQP ENDQP
0 1
2) Verify that EOC is low before starting the conversion. 3) Start the QSPI transfer. 4) Wait until QSPI transfer is complete. The CPU may perform other tasks while waiting. 5) Extract the significant bits from QSPI RAM. Bits B13-B06 are located in QSPI receive RAM entry RR0 bits 7-0, and bits B05-B00 are located in entry RR1 bits 9-4. RR1 bits 3-2 are the sub-LSB bits of the MAX194 (see Table 5).
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MAX194 Evaluation System/Evaluation Kit Evaluates: MAX194/MAX195
Listing 1. Sample Code for 68HC16 Interface
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MAX194 Evaluation System/Evaluation Kit Evaluates: MAX194/MAX195
Using Bit-Pushing to Read the MAX194
The MAX194 may be interfaced using a bit-pushing algorithm, such as the following: 1) Verify that EOC is low before starting the conversion. 2) Assert CONV low to begin conversion. 3) Wait until EOC becomes high. Conversion has begun. 4) Set CONV high. 5) Wait until EOC becomes low. Conversion is complete. 6) Assert SCLK low. 7) Assert CS low. 8) Clear the 16-bit result register. 9) Repeat 16 times: 9-1. Set SCLK high. 9-2. Rotate the 16-bit result register left. 9-3. Read DOUT into least significant bit of the result register. 9-4. Assert SCLK low. 10) Set CS high.
_Detailed Description of Hardware
Jumper Options
Several jumper blocks allow different configurations of the MAX194. Jumper functions are listed in Table 6. See the Voltage Reference and Measuring Supply Current sections.
Table 6. Jumper Settings
JUMPER JU1 Open "OSC" JU3 "EXT" "QSPI" "QSPI" JU4 "GND" "QSPI" JU5 "CONT" Open JU6 Closed "SHDN" "AUTO" "UNI" Open POSITION Closed FUNCTION Ground the SCLK pin. Allows the SCLK pin to be driven by the user. Conversion clock is driven by crystal oscillator U4. Conversion clock is driven by the EXTCLK input pad. Conversion clock is driven by the QSPI serial clock. Connects CS to QSPI chip-select PCS0. Connects CS to ground; data output is always enabled. Connects CONV to QSPI chip-select PCS0. Connects CONV to EOC for continuous conversion mode. Normal operating mode. Momentary closure resets and re-calibrates the MAX194. Do not close this jumper if the C module is connected. Select shutdown mode. Lets 68HC16 drive the BP/UP/SHDN pin. If no C is connected, bipolar input mode is selected. Select unipolar mode. Select bipolar mode.
Reset and Calibration Procedure
When the MAX194 is installed in an environment with an unregulated temperature, thermal variation can cause DC offset errors. Transients on the power supply or reference during the power-on calibration are also a source of DC offset error. These errors can be eliminated by performing re-calibration, as outlined below: 1) Assert the MAX194 RESET pin low. 2) Run the conversion clock until EOC becomes high. 3) Set the MAX194 RESET pin high. 4) Run the conversion clock until EOC becomes low. For best accuracy, a typical application circuit should allow time for the power supply and ambient temperature to settle before re-calibrating the MAX194. Refer to the Calibration section of the MAX194 data sheet.
JU7
Data Connector Interface
The 68HC16 module and MAX194 communicate through the QSPI port on the 40-pin data connector. Table 7 lists the function of each pin.
Table 5. QSPI Receive Format for MAX194
ADDR RR0 RR1 6 15 x x 14 x x 13 x x 12 x x 11 x x 10 x x 9 x B5 8 x B4 7 B13 B3 6 B12 B2 5 B11 B1 4 B10 B0 3 B9 sub 2 B8 sub 1 B7 x 0 B6 x
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MAX194 Evaluation System/Evaluation Kit
Analog Input Buffer
The analog input to the MAX194 may be buffered by U8. A MAX400 is used because of its low VOS drift. The feedback circuit consists of four passive components: R41, R61, C171, and R51. R41 isolates the op-amp's output from the dynamic capacitive load at the AIN input. R61 makes the network accurate at the reference input (without R61, the reference voltage would appear at the output of the op amp). C171 compensates the high-frequency response by making R51 dominate at high frequencies. Input offset may be improved by adding a 1000pF to 0.01F ceramic capacitor at site C28. by making R5 dominate at high frequencies. The reference buffer U5 draws its power through the lowpass filter formed by R3 and C18. The filter provides the necessary power-supply rejection. U5 is powered by the unregulated input supply to ensure enough headroom to buffer the 4.096V reference.
Evaluates: MAX194/MAX195
Layout, Power Supplies, and Grounding
Good PC board layout necessary to achieve specified performance, and an analog ground plane is essential for optimum performance. The PC board layout artist must be provided with explicit instructions, preferably a pencil sketch of the placement of sensitive analog components and the routing of ground connections. See the EV kit PC board layout for an example. Use the following guidelines: 1) At the schematic level, keep the analog power supplies and grounds separate from all other power supplies and grounds. Digital power may be connected to analog power through a 10 series resistor to attenuate digital noise. 2) Cluster the MAX194, the voltage reference, and any input or reference buffers near the site where the analog signal enters the board. Place 0.1F ceramic decoupling capacitors within 10mm of the MAX194's power-supply and voltage-reference pins. 3) Keep the analog-input signal ground return separate from the analog ground plane, connecting to analog ground only at the AGND pin of the MAX194. The analog input and its signal groundreturn traces should both follow the same route to help reject common-mode noise.
Voltage Reference
The voltage reference U2 provides a 4.096V reference, which is buffered by U5. The buffer isolates the reference from the MAX194's capacitive switching load. To eliminate the buffer circuit, cut traces JU8 and JU9 and connect a wire from JU9 pin 1 to the VREF pad.
Reference Buffer
The reference input to the MAX194 may be buffered by U5. The MAX400 op amp is used because of its low V OS drift. By using a bipolar (instead of CMOS) op amp, the substrate can be connected to the quiet analog ground, reducing the noise coupled through the power supplies. The feedback circuit consists of four passive components: R4, R6, C17, and R5. R4 isolates the op-amp's output from the heavy capacitive load that bypasses the VREF pin. R6 makes the network accurate at the reference input (without R6, the reference voltage would appear at the output of the op amp). C17 compensates the high-frequency response
Table 7. Data-Interface Connections
PIN NO. 1-4 5, 6 7, 8 9-26 27 28, 29, 30 31 32 33, 34 35 36 37 38 39, 40 68HC16 SIGNAL GND +12V +5V Reserved IC1 Reserved OC2 OC3 Reserved MISO Reserved SCK PCS0 Reserved MAX194 SIGNAL GND +12V VDDD Reserved EOC Reserved RESET BP/UP/SHDN Reserved DOUT Reserved CLK CS Reserved FUNCTION Ground Unregulated 12V DC Supply Regulated +5V DC from 68HC16 Module Reserved End-of-Conversion Output from MAX194 Reserved Active-Low RESET to MAX194 Shutdown/Bipolar/Unipolar Input to MAX194 Reserved QSPI Master Input; Serial Data Output from MAX194 Reserved QSPI Serial Clock from 68HC16 QSPI Chip-Select from 68HC16 Reserved 7
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MAX194 Evaluation System/Evaluation Kit Evaluates: MAX194/MAX195
The MAX194 evaluation board generates its own highquality power supplies from a single DC input (8V to 20V), such as a plug-in wall transformer. When the MAX194 evaluation board is connected to the 68HC16 C module, the C module uses the unregulated input supply to generate its own separate +5V digital supply. U6 converts the unfiltered input down to +5V to provide the VDDA analog supply. Current spikes from the digital supply VDDD are attenuated by R1. Schottky diode D1 protects the device substrate. U7 inverts the +12V to -12V, and U3 regulates the -12V to -5V, providing the VSSA analog supply.
Table 8. Current-Sense Jumpers
JUMPER IS1 IS2 IS3 IS4 POWER SUPPLY VDDA VSSA VSSD VDDD DESCRIPTION Analog +5V Analog -5V Digital -5V Digital +5V
Measuring Supply Current
To measure the supply current drawn by the MAX194, turn off the power and prepare the board by carefully cutting the traces at IS1, IS2, IS3, and IS4, and installing 2-pin headers and shunts (see Table 8).
Each supply may be measured by replacing the corresponding shunt with a current-meter connection. For example, to measure the current drawn by the +5V digital supply, replace the shunt at IS4 with a current meter. The direction of current flow is marked with arrows on the silkscreen. Do not connect or disconnect the current meter while the power is on. After observing supply current in operating and shutdown modes, the board may be restored by installing shunts at IS1-IS4.
8
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MAX194 Evaluation System/Evaluation Kit Evaluates: MAX194/MAX195
INPUT BUFFER (OPTIONAL) VDDA R51, 47k +9V / FILTERED = DIGITAL GROUND = ANALOG GROUND
VDDD
C171 0.01F D2 1N5819 JU2 R12, 20k R61 1k 6 R41 22 8
IS4
IS1
7 1
2
C29 0.1F
C6 15F
C7 15F
AIN
U8 5 MAX400CPA
3 4 C26 0.1F R9 10M BUFFERED INPUT
C5 0.1F
C1 0.1F
DIRECT INPUT
-9V / FILTERED
4 VDDD
16 VDDA
+12V / UNREGULATED C30 (OPTIONAL) 15F 20V C23 0.1F 1 2 3 4 COMP 8 7 VOUT TRIM 6 5
C19 0.1F
U1 MAX194
RESET CONV CS DOUT SCLK EOC BP / UP/ SHDN 10 RESET 9 CONV 8 CS 5 DOUT 3 SCLK 7 EOC 1 BP / UP/ SHDN AIN C28 (OPTIONAL) 1000pF 13 to 0.01F
U2
VIN TEMP GND
MAX874
4.096V
CLK
2
CONVCLK
R17 R16 R15 4M (OPTIONAL) 1M (OPTIONAL) 2M (OPTIONAL) REFERENCE BUFFER
12 REF C22 47F LOW-ESR SANYO 6SA47M
R5, 47k C17 0.01F R6 1k JU8 R4 22 VREF 6 8 3 4 C24 0.1F 3 JU9 +9V / FILTERED
DGND VSSD AGND VSSA 6 11 14 15 C3 1F
7 1
2
C9 10F
C4 0.1F
U5 5 MAX400CPA
IS3
C2 0.1F
C8 10F -9V / FILTERED 1 2 JU10 VSSA
C21 10F
C20 0.1F
VSSD
IS2
Figure 1. MAX194 EV Kit Schematic
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MAX194 Evaluation System/Evaluation Kit Evaluates: MAX194/MAX195
VDDD P1.0 / IC1 P1.1 / IC2 P1.2 / IC3 P1.3 / OC1 P1.4 / OC2 P1.5 / OC3 P1.6 / OC4 P1.7 / IC4 J1-27 J1-28 J1-29 J1-30 J1-31 J1-32 J1-33 J1-34 R11, 1k "SHDN" 2 JU7 1 2x20 HEADER 4 "UNI" R10, 1k "AUTO" 3 R7, 10k EOC JU6
RESET
= DIGITAL GROUND = ANALOG GROUND
VDDD QSPI_PCSO BP / UP/ SHDN 1
CS 2 3 "QSPI" JU4 "GND" Chip Select
MISO MOSI SCK PCSO / SS CLKOUT PWMA
J1-35 J1-36 J1-37 J1-38 J1-39 J1-40 VDDD
DOUT R13, 1k EOC QSPI_PCSO QSPI_PCSO "OSC" 2 8 3 "QSPI" "EXT" JU3 4 1 CONVCLK "CONT" 1 2 "QSPI" 3
CONV
JU5 CONV Select
14 C25 0.1F
11
SCLK EXTCLK1 JU1
U4
XTAL OSC. 7
TEST POINTS
J2-10 J2-1 J2-2 J2-3 J2-4 J2-5 J2-6 J2-7 J2-8 J2-9 VDDD EOC DOUT (CLKR) J3-9 (XF1) J3-8 J3-1 J3-10 CONV J3-2 (FSR) J3-4 (DR) R18 270 (OPTIONAL) CONCLK
CONV
BP / UP/ SHDN
DGND
SCLK
CS
DOUT
EOC
RESET
CONVCLK
VDDD
R19 270 (OPTIONAL)
Figure 1. MAX194 EV Kit Schematic (continued)
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MAX194 Evaluation System/Evaluation Kit Evaluates: MAX194/MAX195
+12V / UNREG = ANALOG GROUND = POWER GROUND
GND GND GND GND
J1-1 J1-2 J1-3 J1-4
GND
R3 600
+9V / FILTERED C18 100F
2x20 HEADER C27 100F -9V / FILTERED POS12 -12V / UNREG R8 600
UNREG +12VDC UNREG +12VDC
J1-5 J1-6
+12V / UNREG
POS5 U6 +12V / UNREG 3 IN OUT 78LO5 C16 10F HC16 +5V 2x20 HEADER J1-7 J1-8 X3 PGND AGND GND 2 C15 10F JU11 VDDD 1 R1 10 D1 1N5819 VDDA
+12V / UNREG
C10 10F
U7 ICL7662 1 2 NC CAP+ GND CAPV+ OSC LV VOUT 8 7 6 5 -12V/UNREG 2 IN C13 10F 1 GND U3 79LO5 OUT 3 C14 10F R2 10 VSSA VSSD
C11 10F
3 4
C12 100F
NEG12
NEG5
Figure 1. MAX194 EV Kit Schematic (continued)
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MAX194 Evaluation System/Evaluation Kit Evaluates: MAX194/MAX195
Figure 2. MAX194 EV Kit Component Placement Guide--Component Side
12
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MAX194 Evaluation System/Evaluation Kit Evaluates: MAX194/MAX195
Figure 3. MAX194 EV Kit PC Board Layout--Component Side
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MAX194 Evaluation System/Evaluation Kit Evaluates: MAX194/MAX195
Figure 4. MAX194 EV Kit PC Board Layout--Solder Side
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MAX194 Evaluation System/Evaluation Kit
_____________________________________________68HC16 Module Component List
DESIGNATION C1, C2, C3 C4, C5 C6, C7 C8 C9 C10-C14 D1 J1 J2 J3 J4 JU1 JU2 JU3 JU4 JU5 L1 L2 LED1 R1 QTY 3 2 2 1 0 5 1 1 1 1 0 0 0 0 0 0 0 0 1 1 DESCRIPTION 1F ceramic capacitors 22F, 25V radial-lead electrolytic capacitors 22pF capacitors 0.01F capacitor Reference designator, not used 0.1F capacitors 1N4001 diode 40-pin right-angle male connector 2-circuit terminal block Right-angle printed circuit board mount, DB9 female socket Empty Empty Reference designator, not used Empty Empty Empty Empty Empty Light-emitting diode 10M, 5% resistor DESIGNATION C1, C2, C3 C4, C5 C6, C7 C8 C9 C10-C14 D1 J1 J2 J3 J4 JU1 JU2 JU3 JU4 JU5 L1 L2 LED1 R1 QTY 3 2 2 1 0 5 1 1 1 1 0 0 0 0 0 0 0 0 1 1 DESCRIPTION 1F ceramic capacitors 22F, 25V radial-lead electrolytic capacitors 22pF capacitors 0.01F capacitor Reference designator, not used 0.1F capacitors 1N4001 diode 40-pin right-angle male connector 2-circuit terminal block Right-angle printed circuit board mount, DB9 female socket Empty Empty Reference designator, not used Empty Empty Empty Empty Empty Light-emitting diode 10M, 5% resistor
Evaluates: MAX194/MAX195
68HC16 Module ________________General Description
The 68HC16 module is an assembled and tested printed-circuit board intended for use with Maxim's highspeed serial-interface evaluation kits (EV kits). The module uses an inexpensive 8-bit implementation of Motorola's MC68HC16Z1 microcontroller (C) to collect data samples at high speed using the QSPITM interface. It requires an IBM-compatible personal computer and an external DC power supply, typically 12V DC or as specified in EV kit manual. Maxim's 68HC16 module is provided to allow customers to evaluate selected Maxim products. It is not intended to be used as a microprocessor development platform, and such use is not supported by Maxim.
68HC16 Module ________________Detailed Description
Power Input Connector J2
The 68HC16 module draws its power from a user-supplied power source connected to terminal block J2. Be sure to note the positive and negative markings on the board. A three-terminal 5V regulator allows input voltages between 8V and an absolute maximum of 20V. The 68HC16 module typically requires 200mA of input current.
68HC16 Microcontroller
U1 is Motorola's 68HC16Z1 C. Contact Motorola for C information, development, and support. Maxim EV kits use the high-speed queued serial peripheral interface (QSPI) and the internal chip-select generation. A MAX707 on the module monitors the 5V logic supply, generates the power-on reset, and produces a reset pulse whenever the reset button is pressed.
TM QSPI is a trademark of Motorola Corp.
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MAX194 Evaluation System/Evaluation Kit Evaluates: MAX194/MAX195
The 68HC16 uses a phase-locked loop (PLL) to set its bus speed. Crystal Y1 is a 32.768kHz frequency reference. The internal oscillator runs 256 times faster than the external crystal. When the 68HC16 is reset, it waits for the PLL to lock before it executes any software. After the PLL locks onto the reference frequency, the software doubles the clock speed by writing to the clock synthesizer control register, selecting a bus speed of 16.78MHz. U5, the user RAM area, is a 32kbyte CMOS static RAM. The 74HCT245 octal buffer lets the 68HC16 module access an 8-bit port on the 40-pin interface connector. This memory-mapped port consists of separate read and write strobes, four chip selects, four address LSBs, and eight data bits.
Table 9. Serial Communications Port J3
PIN 1 2 3 4 5 6 7 8 9 NAME DCD RXD TXD DTR GND DSR RTS CTS None FUNCTION Handshake; hard-wired to DTR and DSR RS-232-compatible data output from 68HC16 module RS-232-compatible data input to 68HC16 module Handshake; hard-wired to DCD and DSR Signal ground connection Handshake; hard-wired to DCD and DTR Handshake; hard-wired to CTS Handshake; hard-wired to RTS Unused
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 this port. If the only available serial port has a 25-pin connector, you may use a standard 25-pin to 9-pin adapter. Table 9 shows the pinout of J3. The MAX233 is an RS-232 interface voltage level shifter with two transmitters and two receivers. It includes a built-in charge pump with internal capacitors that generates the output voltages necessary to drive RS-232 lines.
Table 10. 40-Pin Data-Connector Signals
PIN 1-4 5, 6 7, 8 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 NAME GND VPREREG VCC RD WR 7E000 7E800 7F000 7F800 A00 A01 A02 A03 EXTD0 EXTD1-7 IC1 IC2 IC3 OC1 OC2 OC3 OC4 IC4 MISO MOSI SCK PCS0/SS CLKOUT PWMA FUNCTION Ground Unregulated input voltage +5V from on-board regulator Read strobe Write strobe Chip select for 7E000-7E7FF Chip select for 7E800-7EFFF Chip select for 7F000-7F7FF Chip select for 7F800-7FFFF Address bit 0 (LSB) Address bit 1 Address bit 2 Address bit 3 Buffered data bus 0 (LSB) Buffered data bus bits 1-7 General I/O port bit 0 (LSB) General I/O port bit 1 General I/O port bit 2 General I/O port bit 3 General I/O port bit 4 General I/O port bit 5 General I/O port bit 6 General I/O port bit 7 QSPI master-in, slave-out QSPI master-out, slave-in QSPI serial clock QSPI chip-select output System clock output Pulse-width-modulator output
40-Pin Data Connector J1
The 20 x 2 pin header connects the 68HC16 module to a Maxim EV kit. Table 10 lists the function of each pin. Note that 68HC16 object code is not compatible with 68HC11 object code. Use the 68HC16 module only with those modules that are designed to support it, and only download code that is targeted for the 68HC16 module. Downloading incorrect object code into the 68HC16 module will have unpredictable results.
Address Ranges
The 68HC16 C generates various enable signals for different address ranges. The ROM and RAM enable signals are fed directly to the respective chips. Several additional signals (J1.11-J1.14) are available on the data connector to be used by Maxim EV kits. Table 11 outlines the address ranges for each of the elements found on the 68HC16 module, and Table 12 is a truth table that describes the logic for each of the 68HC16's chip-select outputs. Because the addresses are not completely decoded, the boot ROM and user RAM have shadows.
16
______________________________________________________________________________________
MAX194 Evaluation System/Evaluation Kit
Table 11. 68HC16 Module Memory Map (all address values are in 20-bit hex)
PIN 00000-07FFF 08000-0FFFF 10000-17FFF 18000-1FFFF 20000-203FF 20400-7DFFF 7E000-7E7FF 7E800-7EFFF 7F000-7F7FF 7F800-7FFFF 80000-F7FFF F8000-FF6FF FF700-FF73F FF740-FF8FF FF900-FF93F FF940-FF9FF FFA00-FFA7F FFA80-FFAFF FFB00-FFB07 FFB08-FFBFF FFC00-FFDFF FFE00-FFFFF FUNCTION Boot ROM (U3, strobed by CSBOOT) Shadow of boot ROM User RAM (U5, strobed by CS0 and CS2) Shadow of user RAM Internal standby RAM; 1kbyte Unused External chip select (J1 pin 11) (CS7) External chip select (J1 pin 12) (CS8) External chip select (J1 pin 13) (CS9) External chip select (J1 pin 14) (CS10) Not accessed by the 68HC16 Unused 68HC16's built-in ADC (not used) Unused General-purpose timer module (GPT) Unused System integration module (SIM) Unused Internal standby RAM (SRAM) control registers Unused Queued serial module (QSM) Unused
Boot ROM
The boot ROM, U3, is configured as an 8-bit memory device. Resistor R4 pulls data bit 0 low during system reset, forcing the C to fetch instructions using only the upper eight data bits. The boot ROM checks the system and waits for commands from the host. Refer to the EV kit manual for specific start-up procedures.
Evaluates: MAX194/MAX195
Software
All software is supplied on a disk with the EV kit. Instructions for operating the software are included in the EV kit manual. Refer to the EV kit manual for more information.
_______68HC16 Module Self Check
To test the 68HC16 module's integrity, connect the power supply to the power terminals (J2). Do not connect anything to J1 or J3. Slide the power switch SW1 to the "ON" position. The LED will light up, and will flash within 5 seconds. If the LED flashes with a 50%-on/50%-off duty cycle, then it passed its self check. Note that this test does not exercise the RS-232 port or the EV kit 40-pin interface, but it does confirm that the power supply, microprocessor, ROM, and RAM passed the self test. If the LED flashes with a 10%-on/90%-off duty cycle, then it failed its self check. Most likely, the RAM chip (U5) is bad. If the LED remains on and does not flash, then the problem is either U3 (the EPROM), U1 (the microprocessor), U4 (the regulator), the MAX707 reset generator, or the power supply. Use a voltmeter to verify that the power supplies are good. Check the powersupply input and the +5V output from the regulator. Use an oscilloscope to see if the 32.768kHz reference oscillator is running.
______________________________________________________________________________________
17
MAX194 Evaluation System/Evaluation Kit Evaluates: MAX194/MAX195
Table 12. 68HC16 Chip-Select Outputs Truth Table
ADDRESS RANGE 0xxxx read 1xxxx read 1xxxx write 7E0xx read 7E0xx write 7E8xx read 7E8xx write 7F0xx read 7F0xx write 7F8xx read 7F8xx write CSBOOT L H H H H H H H H H H CS0 H H L H H H H H H H H CS1 H H H L H L H L H L H CS2 H L H H H H H H H H H CS5 H H H H L H L H L H L CS6 H H H L L L L L L L L CS7 H H H L L H H H H H H CS8 H H H H H L L H H H H CS9 H H H H H H H L L H H CS10 H H H H H H H H H L L
VCC
R5 470
LED1 PWMB
GROUND UNREGULATED 7V TO 20V REGULATED +5V INTEL COMPATIBLE READ/WRITE STROBES CHIP SELECTS LOW ADDRESS BITS
VCC
C13 0.1F GND
CS6/IOBUFFER CS1/RDIO D08 D09 D10 D11 D12 D13 D14 D15
19 1 2 3 4 5 6 7 8 9
OE DIR A1 A2 A3 A4 A5 A6 A7 A8
U6 74HCT245
B1 B2 B3 B4 B5 B6 B7 B8
18 17 16 15 14 13 12 11
EXTD0 EXTD1 EXTD2 EXTD3 EXTD4 EXTD5 EXTD6 EXTD7
8-BIT BUFFERED BIDIRECTIONAL DATA BUS
8-BIT GENERAL I/O PORT
HIGH-SPEED SERIAL INTERFACE (QSM/QSPI) VCC
1 2 3 4
GND GND VPREREG VCC CS1/RDIO CS7/7E000 CS9/7F000 A00 A02 EXTD0 EXTD2 EXTD4 EXTD6 IC1 IC3 OC2 OC4 MISO SCK CLKOUT
J1-1 J1-3 J1-5 J1-7 J1-9 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
J1-2 J1-4 J1-6 J1-8 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
GND GND VPREREG VCC CS5/WRIO CS8/7E800 CS10/7F800 A01 A03 EXTD1 EXTD3 EXTD5 EXTD7 IC2 OC1 OC3 IC4 MOSI PCSO/SS PWMA
TSTME BKPT/DSCLK BKPT/DSCLK HALT BERR MODCLK DSACK1 DSACK0 IRQ7 DS GND GND RESET VCC J4-1 J4-3 J4-5 J4-7 J4-9 J4-2 J4-4 J4-6 J4-8 J4-10 BERR BKPT/DSCLK FREEZE IPIPE1/DSI IPIPE0/DS0
R6 10k SIP RESISTOR
5 6 7 8 9 10
Figure 5. 68HC16 Module Schematic
18 ______________________________________________________________________________________
MAX194 Evaluation System/Evaluation Kit Evaluates: MAX194/MAX195
C14 0.1F C8 0.01F MISO MOSI SCK PCSO/SS PWMA PWMB VSSE VCC IC1 IC2 IC3 OC1 OC2 VSSI VDDI OC3 OC4 IC4 VCC CS10/7F800 CS9/7F000 CS8/7E800 CS7/7E000 CS6/IOBUFFER CS2/RDRAM CS1/RDIO VSSE
A01 A02 VCC VSSE A03 A04 A05 A06 A07 A08 VSSI A09 A10 A11 A12 A13 A14
VCC
VSSE
VRL ADA6 ADA7 VSTBY XTAL VDDSYN EXTAL VSSI VDDI XFC VDDE VSSE CLKOUT FREEZE/QUOT TSTME/TSC BKPT/DSCLK IPIPE0/DS0 IPIPE1/DS1 RESET HALT BERR IRQ7 IRQ6 IRQ5 IRQ4 IRQ3 IRQ2 IRQ1 MODCLK R/W SIZ1 SIZ0 VSSE
18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
RXD PCS3 PCS2 PCS1 PCS0/SS SCK MOSI MISO VSSE VDDE IC1 IC2 IC3 OC1 OC2 VSSI VDDI OC3 OC4 IC4/OC5 PAI PWMA PWMB PCLK VSSE VDDE ADDR23 ADDR22 ADDR21 ADDR20 ADDR19 BGACK BG TXD ADDR1 ADDR2 VDDE VSSE ADDR3 ADDR4 ADDR5 ADDR6 ADDR7 ADDR8 VSSI ADDR9 ADDR10 ADDR11 ADDR12 ADDR13 ADDR14 ADDR15 ADDR16 ADDR17 ADDR18 VDDE VSSE VDDA VSSA ADA0 ADA1 ADA2 ADA3 ADA4 ADA5 VRH
116 115 114 113 112 111 110 109 108 107 106 105 104 103 102 101 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84
17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 132 131 130 129 128 127 126 125 124 123 122 121 120 119 118 117
RXD TXD
U1 MOTOROLA MC68HC16Z1CFC16
BR FC2 FC1 VDDE VSSE FCO CSBOOT DATA0 DATA1 DATA2 DATA3 VSSI DATA4 DATA5 DATA6 DATA7 DATA8 DATA9 VDDE VSSE DATA10 DATA11 DATA12 DATA13 DATA14 DATA15 ADDRO DSACK0 DSACK1 AVEC DS AS VDDE
CSO/WRRAM CS5/WRIO VCC VSSE CSBOOT/RDROM DOO
VSSI
DO8 DO9 VCC VSSE D10 D11 D12 D13 D14 D15 AOO DSACKO DSACK1 DS VCC
JU4 VSSE VCC
XTAL
EXTAL VSSI VDDI
VCC VSSE CLKOUT FREEZE TSTME BKPT/DSCLK IPIPEO/DS0 IPIPE1/DSI RESET HALT BERR IRQ7
MODCLK
L2 10H OPTIONAL VSSI
C3 1F 20V
C10 0.1F
Figure 5. 68HC16 Module Schematic (continued)
______________________________________________________________________________________ 19
VSSE
51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83
VSTBY
MAX194 Evaluation System/Evaluation Kit Evaluates: MAX194/MAX195
R2 330k C7 22pF Y1 32.768kHz C6 22pF XTAL R1 10M EXTAL TXD VCC GND
2
VCC
7
J3-8 CTS J3-7 RTS T1OUT 5 T2OUT 18 R1IN 4 R2IN 19 C2+ 15 C2+ 10 C216 C211
VCC
2
T1IN T2IN R1OUT R2OUT C1+ C1VVV+
J3-2 RXD
1
VCC SW2 RESET
1
RXD
5
3
U7 MAX707
MR PFI PFO 6 N.C. 8 RESET 7 RESET GND
3
J3-3 TXD GND J3-4 DTR J3-6 DSR J3-1 DCD J3-5 GND
20 8 13
J2 + -
4
RESET
12 17 14
U2 MAX233
GND
9
GND
6
SW1 POWER D1 1N4001 VPREREG JU5 GND L1 10H
3
VSSE
J3-9 RI
1
U4 78M05
IN OUT GND
2
VCC VCC C4 22F 25V
C1 OPTIONAL 1F 20V JU3
C2 1F 20V
VDDI
C5 22F 20V
VSSI
VSSE
R4 10k D00 RESET A(00:18)
R3 10k D09 RESET
A00 A01 A02 A03 A04 A05 A06 A07 A08 A09 A10 A11 A12 A13 A14
10 9 8 7 6 5 4 3 25 24 21 23 2 26 1 20 22 27
A0 A1 U5 A2 62256 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 CS OE WE
VCC
A(00:18)
I/O0 I/O1 I/O2 I/O3 I/O4 I/O5 I/O6 I/O7
11 12 13 15 16 17 18 19
D08 D09 D10 D11 D12 D13 D14 D15
A00 A01 A02 A03 A04 A05 A06 A07 A08 A09 A10 A11 A12 A13
10 9 8 7 6 5 4 3 25 24 21 23 2 26 27 1 22 20
C12 0.1F VCC CSBOOT/RDROM
2
A0 A1 U3 A2 27C256 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 VPP OE CE
DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7
11 12 13 15 16 17 18 19
D08 D09 D10 D11 D12 D13 D14 D15
D(00:15)
VCC
C11 0.1F
GND CS2/RDRAM CS0/WRRAM
A14 32k x 8-BIT HIGH-SPEED CMOS STATIC RAM
1
3
VCC 32k x 8-BIT CMOS EPROM
Figure 5. 68HC16 Module Schematic (continued)
20 ______________________________________________________________________________________
D(00:15)
MAX194 Evaluation System/Evaluation Kit Evaluates: MAX194/MAX195
Figure 6. 68HC16 Module Component Placement Guide--Component Side
______________________________________________________________________________________
21
MAX194 Evaluation System/Evaluation Kit Evaluates: MAX194/MAX195
Figure 7. 68HC16 Module PC Board Layout--Component Side
22 ______________________________________________________________________________________
MAX194 Evaluation System/Evaluation Kit Evaluates: MAX194/MAX195
Figure 8. 68HC16 Module PC Board Layout--Solder Side
______________________________________________________________________________________
23
(c) 1995 Maxim Integrated Products
24 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600
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.
Evaluates: MAX194/MAX195
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MAX194 Evaluation System/Evaluation Kit
MAX194 EV DS REV 1
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