Download

PDF Abstract Text:

19-0349 Rev 1 3 / 95

MAX194 Evaluation System / Evaluation Kit

19-0349 Rev 1 3 / 95
MAX194 Evaluation System / Evaluation Kit
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
PART MAX194EVC16-DIP MAX194EVKIT-DIP 68HC16MODULE TEMP. RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C BOARD TYPE Through-Hole Through-Hole Through-Hole
68HC16 MODULE Note: PC board labeled MAX195 for both MAX194 EV kit and MAX195 EV kit.
MAX194 / MAX195 EV BOARD
Call toll free 1-800-998-8800 for free samples or literature.
MAX194 Evaluation System / Evaluation Kit Evaluates: MAX194 / MAX195
QUANTITY 1 1 DESCRIPTION MAX194 Evaluation Kit (MAX194EVKIT-DIP) 68HC16 C Module (68HC16MODULE)
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 µC 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 µC 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
Table 2. List of Commands Available in KIT194.S19
MAX194 Evaluation System / Evaluation Kit
Evaluates: MAX194 / MAX195
Table 3. Jumper Configuration for StandAlone MAX194 EV Kit
MAX194 Evaluation System / Evaluation Kit Evaluates: MAX194 / MAX195
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:
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
DSCKL
COMD.0
COMD.1
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
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).
MAX194 Evaluation System / Evaluation Kit Evaluates: MAX194 / MAX195
Listing 1. Sample Code for 68HC16 Interface
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.
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 µC module is connected. Select shutdown mode. Lets 68HC16 drive the BP / UP / SHDN pin. If no µC 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.
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
MAX194 Evaluation System / Evaluation Kit
Analog Input Buffer
Evaluates: MAX194 / MAX195
Layout, Power Supplies, and Grounding
Voltage Reference
Reference Buffer
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
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 µC module, the µC 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.
MAX194 Evaluation System / Evaluation Kit Evaluates: MAX194 / MAX195
C171 0.01µF D2 1N5819 JU2 R12, 20k R61 1k 6 R41 22 8
C29 0.1µF
C6 15µF
C7 15µF
U8 5 MAX400CPA
3 4 C26 0.1µF R9 10M BUFFERED INPUT
C5 0.1µF
C1 0.1µF
DIRECT INPUT
-9V / FILTERED
4 VDDD
16 VDDA
+12V / UNREGULATED C30 (OPTIONAL) 15µF 20V C23 0.1µF 1 2 3 4 COMP 8 7 VOUT TRIM 6 5
C19 0.1µF
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 0.01µF
VIN TEMP GND
MAX874
4.096V
CONVCLK
R17 R16 R15 4M (OPTIONAL) 1M (OPTIONAL) 2M (OPTIONAL) REFERENCE BUFFER
12 REF C22 47µF LOW-ESR SANYO 6SA47M
R5, 47k C17 0.01µF R6 1k JU8 R4 22 VREF 6 8 3 4 C24 0.1µF 3 JU9 +9V / FILTERED
DGND VSSD AGND VSSA 6 11 14 15 C3 1µF
C9 10µF
C4 0.1µF
U5 5 MAX400CPA
C2 0.1µF
C8 10µF -9V / FILTERED 1 2 JU10 VSSA
C21 10µF
C20 0.1µF
Figure 1. MAX194 EV Kit Schematic
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
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
JU5 CONV Select
14 C25 0.1µF
SCLK EXTCLK1 JU1
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
RESET
CONVCLK
R19 270 (OPTIONAL)
Figure 1. MAX194 EV Kit Schematic (continued)
MAX194 Evaluation System / Evaluation Kit Evaluates: MAX194 / MAX195
GND GND GND GND
J1-1 J1-2 J1-3 J1-4
R3 600
+9V / FILTERED C18 100µF
2x20 HEADER C27 100µF -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 10µF HC16 +5V 2x20 HEADER J1-7 J1-8 X3 PGND AGND GND 2 C15 10µF JU11 VDDD 1 R1 10 D1 1N5819 VDDA
+12V / UNREG
C10 10µF
U7 ICL7662 1 2 NC CAP+ GND CAPV+ OSC LV VOUT 8 7 6 5 -12V / UNREG 2 IN C13 10µF 1 GND U3 79LO5 OUT 3 C14 10µF R2 10 VSSA VSSD
C11 10µF
C12 100µF
NEG12
Figure 1. MAX194 EV Kit Schematic (continued)
MAX194 Evaluation System / Evaluation Kit Evaluates: MAX194 / MAX195
Figure 2. MAX194 EV Kit Component Placement Guide-Component Side
MAX194 Evaluation System / Evaluation Kit Evaluates: MAX194 / MAX195
Figure 3. MAX194 EV Kit PC Board Layout-Component Side
MAX194 Evaluation System / Evaluation Kit Evaluates: MAX194 / MAX195
Figure 4. MAX194 EV Kit PC Board Layout-Solder Side
MAX194 Evaluation System / Evaluation Kit
Evaluates: MAX194 / MAX195
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
QSPI is a trademark of Motorola Corp.
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
MAX194 Evaluation System / Evaluation Kit
Table 11. 68HC16 Module Memory Map (all address values are in 20-bit hex)
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 µC 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.
MAX194 Evaluation System / Evaluation Kit Evaluates: MAX194 / MAX195
Table 12. 68HC16 Chip-Select Outputs Truth Table
R5 470
LED1 PWMB
GROUND UNREGULATED 7V TO 20V REGULATED +5V INTEL COMPATIBLE READ / WRITE STROBES CHIP SELECTS LOW ADDRESS BITS
C13 0.1µF GND
CS6 / IOBUFFER CS1 / RDIO D08 D09 D10 D11 D12 D13 D14 D15
OE DIR A1 A2 A3 A4 A5 A6 A7 A8
U6 74HCT245
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
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
Figure 5. 68HC16 Module Schematic
MAX194 Evaluation System / Evaluation Kit Evaluates: MAX194 / MAX195
C14 0.1µF C8 0.01µF 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
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
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
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
DO8 DO9 VCC VSSE D10 D11 D12 D13 D14 D15 AOO DSACKO DSACK1 DS VCC
JU4 VSSE VCC
EXTAL VSSI VDDI
VCC VSSE CLKOUT FREEZE TSTME BKPT / DSCLK IPIPEO / DS0 IPIPE1 / DSI RESET HALT BERR IRQ7
MODCLK
L2 10µH OPTIONAL VSSI
C3 1µF 20V
C10 0.1µF
Figure 5. 68HC16 Module Schematic (continued)
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
J3-8 CTS J3-7 RTS T1OUT 5 T2OUT 18 R1IN 4 R2IN 19 C2+ 15 C2+ 10 C216 C211
T1IN T2IN R1OUT R2OUT C1+ C1VVV+
J3-2 RXD
VCC SW2 RESET
U7 MAX707
MR PFI PFO 6 N.C. 8 RESET 7 RESET GND
J3-3 TXD GND J3-4 DTR J3-6 DSR J3-1 DCD J3-5 GND
RESET
U2 MAX233
SW1 POWER D1 1N4001 VPREREG JU5 GND L1 10µH
J3-9 RI
U4 78M05
IN OUT GND
VCC VCC C4 22µF 25V
C1 OPTIONAL 1µF 20V JU3
C2 1µF 20V
C5 22µF 20V
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
A0 A1 U5 A2 62256 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 CS OE WE
A(00:18)
D08 D09 D10 D11 D12 D13 D14 D15
A00 A01 A02 A03 A04 A05 A06 A07 A08 A09 A10 A11 A12 A13
C12 0.1µF VCC CSBOOT / RDROM
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
D08 D09 D10 D11 D12 D13 D14 D15
D(00:15)
C11 0.1µF
GND CS2 / RDRAM CS0 / WRRAM
A14 32k x 8-BIT HIGH-SPEED CMOS STATIC RAM
VCC 32k x 8-BIT CMOS EPROM
Figure 5. 68HC16 Module Schematic (continued)
D(00:15)
MAX194 Evaluation System / Evaluation Kit Evaluates: MAX194 / MAX195
Figure 6. 68HC16 Module Component Placement Guide-Component Side
MAX194 Evaluation System / Evaluation Kit Evaluates: MAX194 / MAX195
Figure 7. 68HC16 Module PC Board Layout-Component Side
MAX194 Evaluation System / Evaluation Kit Evaluates: MAX194 / MAX195
Figure 8. 68HC16 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.
Evaluates: MAX194 / MAX195
MAX194 Evaluation System / Evaluation Kit
MAX194 EV DS REV 1
FAX NUMBERS:
Featuring:
Product Data Sheets Evaluation Kit Manuals Free Literature Request Cards
Call toll free 1-800-998-8800 for free samples or literature.
Germany (Maxim GmbH)
UK (01734) 305577
US (408) 737-7194
1994 EVALUATION KIT DATA BOOK
1994 New Releases Data Book 1994 Battery Management and DC-DC Converter Circuit Collection 1994 Applications & Product Highlights Book 1993 New Releases Data Book, Vol. II 1993 Applications & Product Highlights Book 1992 New Releases Data Book, Vol. I 1992 Applications & Product Highlights Book
Other Data Books Available from Maxim:
1994 EVALUATION KIT DATA BOOK FAXBACK OFFER
Printed USA
France (1) 30 64 73 48
Italy
is a registered trademark of Maxim Integrated Products.
Taiwan (2) 555 6348 Japan (03) 3232-6149