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MAX125 / MAX126 Evaluation Systems / Evaluation Kits

19-1322 Rev 0 10 / 97
MAX125 / MAX126 Evaluation Systems / Evaluation Kits
General Description
o Proven PC Board Layout o Complete Evaluation System Samples to 40ksps o Convenient Test Points Provided On Board o Data-Logging Software with FFT Capability o Fully Assembled and Tested
Evaluate: MAX125 / MAX126
Ordering Information
PART MAX125EVKIT MAX125EVB16 MAX126EVKIT MAX126EVB16 TEMP. RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C INTERFACE TYPE User Supplied Windows Software User Supplied Windows Software
Stand-Alone EV Kits
The MAX125 software can be used only with the complete evaluation system (MAX125EVB16 or MAX126EVB16), which includes the 68HC16MOD-16WIDE module together with the MAX125EVKIT or MAX126EVKIT.
EV Systems
MAX125EVB16 System Component List
PART MAX125EVKIT 68HC16MOD-16WIDE QTY 1 1 DESCRIPTION MAX125 evaluation kit 68HC16 µC module with 16-bit parallel interface
MAX126EVB16 System Component List
PART MAX126EVKIT 68HC16MOD-16WIDE QTY 1 1 DESCRIPTION MAX126 evaluation kit 68HC16 µC module with 16-bit parallel interface
Table 1. Power-Supply and Timing Signal Connections
PIN P1-1 P1-5 P1-9 P1-35 P1-36 P1-37 P1-38 POWER SUPPLY SIGNAL Ground AVX Positive Supply, +8V to +20V AVX Negative Supply, -8V to -20V AVX Chip AVX Select Convert-Start AVX Write AVX Strobe Read AVX Strobe
Windows 3.1 and Windows 95 are trademarks of Microsoft Corp.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468.
MAX125 / MAX126 Evaluation Systems / Evaluation Kits Evaluate: MAX125 / MAX126
MAX125EVKIT / MAX126EVKIT Component List
Quick Start
Recommended Equipment
Connections and Setup
List of Files in MAX125 EV Kit
FILE INSTALL.EXE MAX125.EXE MAX125.HLP KIT125.B16 MAX125.INI UNINST.EXE FUNCTION Installs EV kit files onto your computer Application program Help file Loads software into the 68HC16 µC Program settings Removes EV kit files from your computer
MAX125 / MAX126 Evaluation Systems / Evaluation Kits
7) Apply input signals to the inputs labeled CH1A-CH4A at the bottom edge of the MAX125 / MAX126 EV kit board. Observe the readout on the screen. You may optionally record readings into a data-log file. Click on the "New Log" button to begin or end data logging. The "Log File Format" dialog box is displayed. One complete line of data is written after all enabled channels have been sampled. The first line of the log file contains the column headings. Each subsequent line contains all enabled channels, separated by commas, tabs, or spaces (previously selected in the "Log File Format" dialog box). Once a log file has been opened, it can be paused or resumed with the corresponding Log menu commands. The program continues to write data to the log file until the "Stop Log" button is clicked.
Evaluate: MAX125 / MAX126
Detailed Description of Software
The MAX125 / MAX126 digitize up to four inputs from either the A or the B input bank. Conversion time is determined by the number of enabled inputs. The software collects samples at a maximum throughput of 40ksps (one channel) and 26ksps (four channels). The various program functions are grouped into dialog boxes, which are accessible from the Window menu on the main menu bar.
One-Shot Read Tool
The "One-Shot Read Tool" allows direct control of the analog-to-digital converter (ADC) configuration. Select the channel and mode of operation to update the "Control Byte" display. Or, change the "Control Byte" bits directly and observe the change in the "Channel Selection" control. The "Read Now" button writes the configuration information to the ADC and performs one reading.
Keyboard Navigation
If a mouse or other pointing device is not available, use the following keyboard shortcuts (Table 2): · Press ALT+W to display the Window menu, and then select a tool window. · Press the TAB key to select controls within the selected tool window. · · Activate buttons by pressing the spacebar. Use the up / down arrow keys for check boxes, radio buttons, and combo boxes.
Power Cycling Tool
To reduce average supply current demand, the MAX125 / MAX126 can be shut down between conversions. From the Window menu, select "Power Cycling Tool." The amount of power saved depends primarily on how long the part is off between conversions. Conversion accuracy depends on the power-up delay, reference capacitor, and time in power-down. Adjust the off-time with the "Delay Between Samples" command. Adjust the on-time with the "Power-Up Delay" command. Using an adequate power-up delay ensures that the desired conversion accuracy is achieved during powercycling modes. The reference must be allowed enough time to stabilize before the measurement is performed. Start with zero power-up delay, and increase the delay time until no further change in accuracy is observed. The power-up delay requirement depends on the value of the reference capacitor and the off-time (delay between samples). The MAX125 / MAX126 EV kit software performs powerup by writing a configuration word with the shutdown bit cleared. After power-up, the power-up delay is executed to allow time for the reference voltage to stabilize so that an accurate measurement can be performed.
Scan Tool
Table 2. Keyboard-Navigation Shortcuts
KEY TAB ALT+W ALT+space ALT+minus Spacebar ALT+PrintScreen FUNCTION Selects next control Window menu System menu of main program window System menu of child window Clicks on the selected button Copies the image of the main window onto the clipboard
MAX125 / MAX126 Evaluation Systems / Evaluation Kits Evaluate: MAX125 / MAX126
Sampling Tool
To sample data at rates up to 40ksps, select "Sampling Tool" from the Window menu, make your selections, and click on the Start button. Adjust the timing delays as appropriate to control the sample rate. Estimate the effective sample rate by taking the reciprocal of the sum of the delay between samples, the power-up delay, and the conversion time. Sample size is restricted to a power of two so that the "Fast Fourier Transform" (FFT) tool can process the data. "Sample Size" controls the number of samples collected on each selected channel. After the samples have been collected, the data is automatically uploaded to the host and graphed. Once displayed, the data can optionally be saved to a file.
Changing the Reference Voltage The EV kit software assumes a 2.5V reference voltage, unless otherwise specified. Apply an external 2.5V reference to the REFIN pad to overdrive the internal reference. See the MAX125 / MAX126 data sheet for more information. From the Window menu, select "Device Characteristics." Next, type the new reference voltage into the "Reference Voltage" edit box.
Detailed Description of Hardware
FFT Tool
The EV software includes an FFT tool that can display the spectral content of data collected with the highspeed sampling tool. To view the spectral content of a waveform, first select a data sample that was previously collected with the "Sampling Tool." Then select "FFT Tool" from the Window menu. Check the output plots desired and click on the Start button. A data-windowing function preprocesses the data sample before performing an FFT.1) When the input signal is not synchronized to the sampling clock, spectral energy appears to leak into nearby frequency buckets. A suitable data window tapers the raw data to zero amplitude at the beginning and end, reducing this spectral leakage.
Measuring Supply Current
Device Characteristics
The "Device Characteristics" dialog box contains parameters that are not expected to change often. The device selection is used to select between the MAX125 and the MAX126.
Table 3. Troubleshooting Guide
PROBLEM · · No output measurement. System seems to report zero voltage or fails to make a measurement. CORRECTIVE ACTIONS Check the +5V and -5V supply voltages. Check the 2.5V REFOUT reference voltage using a digital voltmeter. Use an oscilloscope to verify that the 16MHz clock is running and that the conversion-start signal is being strobed.
P1-5 8 IN OUT GND GND N.C. 17 P2-1 D0 / A0 D1 / A1 D2 / A2 D3 / A3 D4 D5 D6 D7 D8 CH4A 32 CH4A CLK 14 R7 10 8 C11 100pF -5V REFIN 6 C5 0.1µF REFOUT 7 C6 0.1µF REFOUT C7 4.7µF 6.3V 8 CONVST DGND AVSS 31 AGND AGND 36 REFIN 25 CH4B 33 CH4B CH3A 34 CH3A +5V CH3B 35 CH3B CH2B 1 CH2B CH2A 2 CH2A CH1B 3 CH1B CH1A CH1A P2-2 P2-3 P2-4 P2-5 P2-6 P2-7 16 15 14 13 D9 D10 D11 D12 D13 INT JU1 12 11 10 9 30 19 20 21 22 23 24 DVDD 4 AVDD 5 4 3 C2 0.1µF C1 0.1µF R8 10 2 GND GND N.C. +5V 7 C4 0.1µF 6 5 C3 10µF 25V 1
R1 100
U2 LM78L05ACM
Figure 1. MAX125 EV Kit Schematic
1 OE 2 A0 Y0 Y1 Y2 Y3 P2-14 P1-20 28 RD WR CS 27 +5V R3 10k +5V R2 10k 18 29 26 R4 10k +5V 9 7 5 3 12 R5 10k P2-13 14 P2-12 16 +5V P2-11 A1 A2 A3 74HCT244 4 6 8 18 P2-10 P2-9 P2-8
CS7 / 7E000
P1-35
P1-38
1 U5 16MHz 7 OSCILLATOR
P1-37
MAX125 MAX126
CS8 / 7E800
P1-36
19 OE A0 Y0 Y1 Y2 Y3 A1 A2 A3 74HCT244 11 13 15 17
R6 100 8 N.C. IN IN GND 7 C8 10µF 25V C9 0.1µF 6 5 OUT IN IN N.C. 1 2 3 4
U4 LM79L05ACM
P1-1 P1-2 -5V C10 0.1µF P1-3 P1-4 GND
Evaluate: MAX125 / MAX126
MAX125 / MAX126 Evaluation Systems / Evaluation Kits
MAX125 / MAX126 Evaluation Systems / Evaluation Kits Evaluate: MAX125 / MAX126
Figure 2. MAX125 / MAX126 EV Kit Component Placement Guide
Figure 3. MAX125 / MAX126 EV Kit PC Board Layout- Component Side
MAX125 / MAX126 Evaluation Systems / Evaluation Kits Evaluate: MAX125 / MAX126
Figure 4. MAX125 / MAX126 EV Kit PC Board Layout-Solder Side
MAX125 / MAX126 Evaluation Systems / Evaluation Kits Evaluate: MAX125 / MAX126
NOTES
68HC16MOD-16WIDE
Component List
68HC16MOD-16WIDE
General Description
Detailed Description
Power Input Connector J2
The 68HC16MOD-16WIDE 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 68HC16MOD-16WIDE module typically requires 200mA of input current.
68HC16 Microcontroller
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468.
68HC16MOD-16WIDE 68HC16MOD-16WIDE
The 68HC16MOD-16WIDE module 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 68HC16MOD-16WIDE module 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 and U8, the user RAM area, are 32kbyte CMOS static RAMs. The 74HCT245 octal buffers let the 68HC16MOD16WIDE module access a 16-bit port on the interface connectors. This memory-mapped port consists of separate read and write strobes, four chip selects, four address LSBs, and sixteen data bits.
Table 1. 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 68HC16MOD-16WIDE module RS-232-compatible data input to 68HC16MOD-16WIDE 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
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.
Serial Communications
J3 is an RS-232 serial port, designed to be compatible with the IBM PC 9-pin serial port. Use a straightthrough 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 1 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.
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. Use the 68HC16MOD-16WIDE module only with those EV kits that are designed to support it, and only download code that is targeted for the 68HC16MOD-16WIDE module. Downloading incorrect object code into the 68HC16MOD-16WIDE module will have unpredictable results.
40-Pin Connectors P1 and P2
The 20 x 2 pin headers (P1 and P2) connect the 68HC16MOD-16WIDE module to a Maxim EV kit. Table 2 lists the function of each pin.
Address Ranges
68HC16MOD-16WIDE
Self Check
68HC16MOD-16WIDE
Table 2. P1 and P2 Data-Connector Signals
HEADER PIN 1, 4 5, 6 7, 8 9, 10 11 12 13 14 15 16 17 P1 18 19 20 21 22 23 24 25 26 27 28 29 30 NAME GND VPREREG +5V -12V PCS2 PCS3 PCS0 / SS PCS1 MOSI SCK - MISO IC2 IC1 OC1 IC3 - OC2 OC4 OC3 PAI IC4 PWMB PWMA 68HC16-16WIDE MODULE FUNCTION Ground return +12V from wall cube +5V from 78M05 -12V from ICL7662 (typically -8V at 15mA load) QSPI peripheral chip select 2 QSPI peripheral chip select 3 QSPI peripheral chip select 0 QSPI peripheral chip select 1 QSPI Master Output, Slave Input QSPI Serial Clock Not used QSPI Master Input, Slave Output General purpose I / O Input Capture 2 can be used as an IRQ General purpose I / O Input Capture 1 can be used as an IRQ General purpose I / O Output Compare 1 General purpose I / O Input Capture 3 can be used as an IRQ Not used General purpose I / O Output Compare 2 General purpose I / O Output Compare 4 General purpose I / O Output Compare 3 Pulse Accumulator Input General purpose I / O Input Capture 4 can be used as an IRQ Pulse-Width Modulator B output (drives the status LED) Pulse-Width Modulator A output
68HC16MOD-16WIDE 68HC16MOD-16WIDE
Table 2. P1 and P2 Data-Connector Signals (continued)
HEADER PIN 31 32 33 34 P1 35 36 37 38 39, 40 1 2-15 16 17, 18 P2 19 20 21 22 23-40 NAME
PCLK CS10 / 7F800 CS9 / 7F000 CS7 / 7E000 CS8 / 7E800 CS5 / WRIO CS1 / RDIO
EXTD0 EXTD1-14 EXTD15
A01 A02 A03 A04
Table 3. Memory Map (all address values are in 20-bit hex)
68HC16MOD-16WIDE 68HC16MOD-16WIDE
Table 4. Chip-Select Outputs Truth Table
R5 470
LED1 PWMB
C9 0.1µF GND
CS6 / IOBUFFER CS1 / RDIO D00 D01 D02 D03 D04 D05 D06 D07
OE DIR A1 A2 A3 A4 A5 A6 A7 A8
GND GND VPREREG VCC -12V PCS2 PCO / SS MOSI IC2 OC1 OC4 PAI PWMB CS10 / 7F800 CS7 / 7E000 CS5 / WRIO
U6 74HCT245
EXTD0 EXTD1 EXTD2 EXTD3 EXTD4 EXTD5 EXTD6 EXTD7
P1-1 P1-3 P1-5 P1-7 P1-9 P1-11 P1-13 P1-15 P1-17 P1-19 P1-21 P1-23 P1-25 P1-27 P1-29 P1-31 P1-33 P1-35 P1-37 P1-39
P1-2 P1-4 P1-6 P1-8 P1-10 P1-12 P1-14 P1-16 P1-18 P1-20 P1-22 P1-24 P1-26 P1-28 P1-30 P1-32 P1-34 P1-36 P1-38 P1-40
GND GND VPREREG VCC -12V PCS3 PCS1 SCK MISO IC1 IC3 OC2 OC3 IC4 PWMA PCLK CS9 / 7F000 CS8 / 7E800 CS1 / RDIO
EXTD0 EXTD2 EXTD4 EXTD6 EXTD8 EXTD10 EXTD12 EXTD14 A01 A03
P2-1 P2-3 P2-5 P2-7 P2-9 P2-11 P2-13 P2-15 P2-17 P2-19 P2-21 P2-23 P2-25 P2-27 P2-29 P2-31 P2-33 P2-35 P2-37 P2-39
P2-2 P2-4 P2-6 P2-8 P2-10 P2-12 P2-14 P2-16 P2-18 P2-20 P2-22 P2-24 P2-26 P2-28 P2-30 P2-32 P2-34 P2-36 P2-38 P2-40
EXTD1 EXTD3 EXTD5 EXTD7 EXTD9 EXTD11 EXTD13 EXTD15 A02 A04
TSTME BKPT / DSCLK BKPT / DSCLK HALT BERR MODCLK DSACK1 DSACK0 IRQ7 CS6 / IOBUFFER CS1 / RDIO D08 D09 D10 D11 D12 D13 D14 D15
R6 10k SIP RESISTOR
OE DIR A1 A2 A3 A4 A5 A6 A7 A8
U9 74HCT245
EXTD8 EXTD9 EXTD10 EXTD11 EXTD12 EXTD13 EXTD14 EXTD15
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
Figure 1. 68HC16MOD-16WIDE Module Schematic
68HC16MOD-16WIDE 68HC16MOD-16WIDE
C14 0.1µF MISO MOSI SCK PCSO / SS PCS1 PCS2 PCS3 RXD TXD VCC CS10 / 7F800 CS9 / 7F000 CS8 / 7E800 CS7 / 7E000 CS6 / IOBUFFER CS2 / RDRAM CS1 / RDIO
A01 A02 VCC A03 A04 A05 A06 A07 A08 A09 A10 A11 A12 A13 A14 A15
VCC VSS
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
VCC OC3 OC4 IC4 PAI PWMA PWMB PCLK
VCC IC1 IC2 IC3 OC1 OC2
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 / WRRAMHIGH CS5 / WRIO VCC CS3 / WRRAMLOW CSBOOT / RDROM DOO DO1 DO2 DO3 DO4 DO5 DO6 DO7 DO8 DO9 VCC VSS D10 D11 D12 D13 D14 D15 AOO DSACKO DSACK1 DS VCC
EXTAL
CLKOUT FREEZE TSTME BKPT / DSCLK IPIPEO / DS0 IPIPE1 / DSI RESET HALT BERR IRQ7
VCC C3 1µF 20V
C10 0.1µF
Figure 1. 68HC16MOD-16WIDE Module Schematic (continued)
MODCLK
68HC16MOD-16WIDE 68HC16MOD-16WIDE
R2 330k C7 22pF Y1 32.768kHz C6 22pF XTAL R1 10M EXTAL TXD VCC GND
C8 0.1µF GND
J3-8 CTS J3-7 RTS T1OUT 5 T2OUT 18 R1IN 4 R2IN 19 C2+ 15 C2+ 10 C216 C211
VCC T1IN T2IN R1OUT R2OUT
J3-2 RXD
VCC SW2 RESET
U7 MAX707
PFO 1 6 N.C. MR 8 RESET 4 7 RESET PFI GND
J3-3 TXD GND J3-4 DTR J3-6 DSR J3-1 DCD J3-5 GND
RESET
C1+ C112 V17 V14 V+
U2 MAX233
SW1 POWER D1 1N4001 VPREREG 1 N.C CAP+ GND CAP8 U10 V+ ICL7662 OSC LV VOUT 7 6 5 C13 100µF GND R7 100 D2 IN4742A 12V R4 10k D00 R3 10k D09
J3-9 RI
U4 78M05
IN OUT GND
VCC C4 22µF 25V
C5 22µF 25V
C1 10µF
RESET
A00 A01 A02 A03 A04 A05 A06 A07 A08 A09 A10 A11 A12 A13 A14 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
C12 0.1µF
A01 A02 A03 A04 A05 A06 A07 A08 A09 A10 A11 A12 A13 A14 A15
A0 A1 U8 A2 62256 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 CS OE WE
D00 D01 D02 D03 D04 D05 D06 D07
C2 0.1µF
A01 A02 A03 A04 A05 A06 A07 A08 A09 A10 A11 A12 A13 A14 A15
A0 A1 U5 A2 62256 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 CS OE WE
D08 D09 D10 D11 D12 D13 D14 D15
C11 0.1µF
GND GND CS2 / RDRAM CS3 / WRRAMLOW
GND CS2 / RDRAM CS0 / WRRAMHIGH
32k x 8-BIT CMOS EPROM
32k x 8-BIT HIGH-SPEED CMOS STATIC RAM
Figure 1. 68HC16MOD-16WIDE Module Schematic (continued)
68HC16MOD-16WIDE 68HC16MOD-16WIDE
Figure 2. 68HC16MOD-16WIDE Module Component Placement Guide
68HC16MOD-16WIDE 68HC16MOD-16WIDE
Figure 3. 68HC16MOD-16WIDE Module PC Board Layout-Component Side
68HC16MOD-16WIDE 68HC16MOD-16WIDE
Figure 4. 68HC16MOD-16WIDE Module PC Board Layout-Solder Side
68HC16MOD-16WIDE 68HC16MOD-16WIDE
NOTES
68HC16MOD-16WIDE 68HC16MOD-16WIDE
NOTES
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