19-0141; Rev. 2; 6/08 MAX186 Evaluation System/Evaluation Kit Features The MAX186 evaluation system (EV system) consists of a MAX186 evaluation kit (EV kit) connected to a Maxim 80C32 microcontroller (µC) module. The unit connects to an IBM-compatible personal computer running software provided with the MAX186 EV kit. Both boards come fully assembled and tested. ♦ Includes EV Kit and 80C32 µC Module Using the EV system, the MAX186 input multiplexer can be software-configured in a variety of single-ended or differential modes with unipolar or bipolar input ranges. The MAX186 can be evaluated with a VSS voltage of 0V or -5V, selectable from the personal computer’s keyboard. ♦ Internal Reference Voltage The EV system is also useful for evaluating the MAX186’s shutdown feature. The MAX186 can be operated in three states of readiness between conversions. There are provisions for monitoring the supply current in the different shutdown states, and for varying the delay between conversions. ♦ Prototyping Area Provided Order the EV system (MAX186EVSYS-DIP) for comprehensive evaluation of the MAX186 or MAX188 using a personal computer. Order the EV kit (MAX186EVKIT-DIP) if the 80C32 module (80C32MODULE-DIP) has already been purchased with a previous Maxim EV system, or for custom use in other µC-based systems. The MAX186 EV kit can also perform limited evaluation on a stand-alone basis (see the MAX186 EV Kit Quick Start section). ♦ 12-Bit Resolution ADC ♦ Serial µC Interface ♦ Unipolar +4.096V or Bipolar -2.048V to +2.048V Input Ranges ♦ Low Supply-Current Shutdown Mode ♦ Evaluates All Operating Modes ♦ Proven PCB Layout ♦ Digitizes 8 Analog Inputs ♦ Fully Assembled and Tested Ordering Information PART TEMP RANGE BOARD TYPE MAX186EVSYS-DIP 0°C to +70°C Through-Hole MAX186EVKIT-DIP 0°C to +70°C Through-Hole 80C32MODULE-DIP 0°C to +70°C Through-Hole EV System ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. 1 Evaluates: MAX186 General Description Evaluates: MAX186 MAX186 Evaluation System/Evaluation Kit EV System Component List QTY 1 1 DESCRIPTION MAX186 evaluation kit (MAX186EVKIT-DIP) 80C32 µC module (80C32MODULE-DIP) MAX186 EV System Quick Start The MAX186 EV system includes a Maxim 80C32 module and a MAX186 EV kit. The two connect through a 40-pin data connector on adjoining edges of the boards. The EV system then connects to an IBM-compatible computer running software provided with the MAX186 EV kit. The personal computer and the 80C32 module are connected via a standard RS-232 serial communication port. If the serial port on the personal computer has the standard 9-pin connector, a straight through cable is used to attach the board. Systems with a 25-pin serial port connector need an adapter or adapter cable (D25 female to D9 male). Both the adapter and the cable are available at most computer supply stores. The steps for using the MAX186 EV system are outlined as follows: 1) Visit www.maxim-ic.com/evkitsoftware to download the latest version of the EV kit software. Save the EV kit software to a temporary folder and uncompress the file (if it is a .zip file). 2) Install the MAX186 EV kit software on your computer by running the INSTALL.EXE program. The program files are copied and icons are created for them in the Windows Start | Programs menu. 3) Connect the MAX186 evaluation board to the 40-pin data connector on the Maxim 80C32 module. 4) Connect an 8V to 16V source to the 2-pin power connector on the 80C32 module. The positive lead connects to the terminal marked VIN. 5) Connect a cable from the personal computer serial connector to the 9-pin RS-232 connector on the 80C32 module. 6) Turn on the power to the 80C32 module. The switch is located on one edge of the board. The LED indicates power from the on-board regulator. 7) Start the MAX186 program by opening its icon in the Windows Start | Programs menu. 2 EV Kit Component List DESIGNATION C1, C2, C3, C4, C8 QTY C6* 1 5 DESCRIPTION 10µF 16V radial electrolytic capacitors 22µF low-ESR radial electrolytic capacitor C5, C7, C9, C10 C11-C18 R1-R8 R9* U1 U2 U3 J1 None H1 None None 4 0.1µF ceramic capacitors 8 8 1 1 1 1 1 1 1 1 4 None 1 None None 1 1 0.01µF ceramic capacitors 300Ω 5% resistors 10kΩ 9-resistor SIP Maxim MAX186DCPP Maxim ICL7660CPA Maxim DG413DJ Female 40-pin data connector 20-pin IC socket for U1 8-pin header 3.00in x 3.75in PCB Rubber feet MAX186 EV kit software on a 5 1/4in floppy disk MAX186 data sheet MAX186 EV kit manual *C6 and R9 are supplied with the kit but not mounted on the PCB. 8) The 80C32 will transmit a logon message and RAM test results when communications are initialized. The MAX186 RAM resident program will then be automatically downloaded. 9) Connect the analog inputs to the CH0-CH7 pads and observe the readout on the screen. MAX186 EV Kit Quick Start This section applies only to use of the MAX186EVKITDIP without the 80C32 module. The MAX186 evaluation board can easily be configured in the quick-look circuit of Figure 5 of the MAX186/ MAX188 data sheet. All of the necessary digital pins are provided on the 8-pin header located along the bottom edge of the board. Each pin function is indicated by labels below the header. _______________________________________________________________________________________ MAX186 Evaluation System/Evaluation Kit 2) Connect +5V and ground (GND) to the appropriately labeled pads on the evaluation board. 3) To operate the MAX186 in single-supply mode, ground the header pin marked VSEL. Leaving the pin open sets the MAX186 VSS pin to -5V (dual-supply operation). 4) Connect a clock signal (0.1MHz to 0.4MHz*) to the header pin, labeled SCLK. Table 1. Port 1 Bit Functions BIT NAME P1.0 VSS SEL P1.1 SCLK Serial clock for data transfer P1.2 SHDN Drives the MAX186 SHDN pin. Cut jumper JU2 to float the SHDN pin. P1.3 – P1.4 SSTRB MAX186 SSTRB pin. Provides the busy output during internal clock mode (see MAX186/MAX188 data sheet). P1.5 DOUT MAX186 DOUT pin. Transfers conversion data from the MAX186 to the 80C32. P1.6 CS MAX186 CS pin. Enables serial communications with the MAX186. P1.7 DIN MAX186 DIN pin. Transfers data from the 80C32 to the MAX186. 5) Ground the header pin, labeled CS. 6) Connect an analog input source to the channel 7 input pad, labeled CH7. 7) Connect an oscilloscope, as shown in Figure 5 of the MAX186/MAX188 data sheet. * To run at clock frequencies up to 2MHz, an external compensation capacitor must be connected to the VREF pin. Install the 22µF capacitor supplied with the kit in location C6, and cut the trace across jumper JU2 to disable the MAX186 internal compensation. FUNCTION VSS select switches the MAX186 VSS pin between ground and -5V. Logic low, VSS = 0V; logic high, VSS = -5V. Not used Detailed Description Serial Interface VSS Circuit The 80C32 and MAX186 communicate through the 8 bits of port 1 on the 80C32. Table 1 lists the function of each bit. The 80C32 drives MAX186 input data on the DIN bit and receives data from the MAX186 on the DOUT bit. For the first eight clock cycles after chipselect ( CS ) goes low, DIN data is clocked into the MAX186 on the rising edge of the serial clock (SCLK) signal. For the 12 data-output clock cycles, the MAX186 updates DOUT data on the falling edge of SCLK. See the MAX186 data sheet for complete information concerning the serial interface; Figures 6-12 of the MAX186/MAX188 data sheet are timing diagrams for operating in the internal and external clock modes. Note that the maximum conversion rate of the EV system is limited to 5ksps, because of the speed limitation of the 80C32. For evaluation at full speed, see the MAX186 EV Kit Quick Start section. An ICL7660 +5V to -5V converter and a DG413 analog switch (mounted on the MAX186 evaluation board) provide the means to switch the MAX186’s VSS voltage between ground and -5V. The analog switch is not required for most application circuits because the VSS voltage will be fixed at either -5V or ground. A negative VSS supply is required only when the MAX186’s input is expected to go below ground. The ICL7660 provides a -5V source with minimal additional circuitry. The ICL7660 converter circuit on the MAX186 EV kit is the standard circuit for +5V to -5V conversion. Its 10mA output capacity is much more than is needed by the MAX186, which requires only 50µA. The additional current is available for user circuits in the prototyping area. For applications where the MAX186 is the only load, the 10µF capacitors may be reduced to 0.1µF. _______________________________________________________________________________________ 3 Evaluates: MAX186 1) Solder the 10-pin SIP resistor, provided with the kit, in the R9 location on the EV kit board. The SIP resistors act as pull-ups for the digital signals connected to the 8-pin header. The marked end of R9 is pin 1. Evaluates: MAX186 MAX186 Evaluation System/Evaluation Kit The MAX186 digital signals are available on the 8-pin header located on the bottom edge of the board. This header provides convenient connections for scope probes or a ribbon cable. Conversion Cycles The MAX186 performs conversions on demand or at preset intervals. The conversion sequence does not vary with the two methods. If the device is in shutdown mode, a dummy conversion brings it out of shutdown, and the program delays to allow the reference voltage to settle. Then, as many as eight conversions are performed to collect data for a complete line of the screen display. Finally, if shutdown mode is enabled, another dummy conversion returns the MAX186 to the proper shutdown state. Shutdown Mode The MAX186 has two shutdown levels. The FULL shutdown mode completely disables the MAX186 reference circuit and reduces supply current to 2µA. A delay of 300µs is required to activate from this shutdown state. The delay must be greater when the external reference compensation capacitor, C6, is installed. Be sure to set the reference settling delay whenever the FULL shutdown mode is used. Table 5 of the MAX186/MAX188 data sheet lists the reference settling times required for different external capacitors. The second shutdown level disables only the reference output buffer. This drops the supply current to 30µA, but requires a shorter delay (5µs with internal compensation) between activation and conversion cycles. This is referred to as the FAST shutdown mode. On the MAX186 evaluation board, the SHDN pin (P1.2), is programmed high so that it always enables the MAX186 in normal operation. All modes are controlled through software. In FAST or FULL shutdown mode, the MAX186 is placed in shutdown between conversion cycles and activated just before the conversions begin. This reduces the average supply current but will require a delay before the conversions. The MAX186EVKIT Personal Computer Program section has information on varying the delay and controlling the shutdown mode. 4 Jumper JU2 is in series with the SHDN pin of the MAX186. Opening this jumper floats the SHDN pin, disabling the internal compensation of the reference buffer. The external compensation capacitor, C6, is supplied with the kit but not mounted on the PCB. If you wish to use external compensation, cut the trace across JU2 and mount the 22µF capacitor, C6. The reference settling delay must be increased. See the MAX186/ MAX188 data sheet for descriptions of internal and external reference compensation. Evaluating External Reference Voltages The MAX186 can be operated with an external reference voltage if the internal reference is disabled. Connecting the REFADJ pin to VDD will disable the internal reference. Soldering a short piece of wire across jumper JU3 will make this connection. The 22µF capacitor should also be soldered into location C6 when using an external voltage. The reference voltage is then applied to the pad labeled VREF. To use the MAX188, which requires an external reference, install C6 and connect the reference source to the VREF pad. Jumper JU1 facilitates monitoring the MAX186 supply current in the shutdown modes. The jumper allows the insertion of a current meter in series with the MAX186 VDD supply. To monitor the current, cut the printed circuit trace between the two holes marked JU1. Then solder two short leads in each hole and connect the ammeter. A short piece of wire can be soldered across the jumper location to restore normal connections. Analog Inputs Each of the eight inputs has a 300Ω resistor in series. These optional resistors were included as current-limiting devices for input overvoltage conditions. There is also an optional 0.01µF capacitor on each of the inputs. This provides the low source impedance required when the channel is the low side of a differential input pair. The input capacitors are not required on channels used as single-ended inputs. Refer to the Pseudo-Differential Input section of the data sheet. _______________________________________________________________________________________ MAX186 Evaluation System/Evaluation Kit Saving Graphs to Disk Data in the real-time graph and in sampled data graphs may be saved to a file. Only the raw output codes are saved, but voltages may be inferred, based on the reference voltage and the maximum code value. The MAX186’s internal 4.096V reference voltage can be adjusted over a ±1.5% range by adding resistors R10 through R13, shown on the schematic. Refer to the MAX186 data sheet for detailed information about the reference voltage. Description of Software The evaluation software’s main window controls the active control word bits, serial clock speed, and sample rate. It displays the voltage and output code for each active channel, as well as some statistics of the input signal. A separate graph window shows the data changing in real time. The update rate is limited to about 10 samples per second due to COM port bandwidth limitations. Controls The control word is divided into several fields. To change the active control word, drop down the appropriate field’s combo box and select the desired option. Statistics The Minimum and Maximum fields show the highest and lowest readings acquired. The Average field shows a running mean based on the equation ai = (k)(xi) + (1 - k) (ai-1). The Clear button resets the statistics. To remove offset errors, first apply 0V to the active input channel, clear statistics, acquire some samples, and then check Tare. This average offset voltage will now be subtracted from all subsequent measurements. Sampling Choose the desired sampling rate (QSPI Clock), sampling size (Sample! menu item), click Begin Sampling! (in Sample! pop-up window). Sample size is restricted to a power of 2 to permit FFT processing once the data is saved to a file. After the samples have been collected, the data is automatically uploaded to the host and is graphed. Once displayed, the data can optionally be saved to a file. Scanning All Channels To scan through all channels, select SCAN from the INPUT menu. Reference Voltage The evaluation software assumes a 4.096V reference voltage, unless otherwise specified. Refer to the MAX186 IC data sheet for more information. To override this value, type the new reference voltage into the Vref edit box and click the Set Vref button. RAM Resident Program The 186RAM.MAX program is an 80C32 program that is transferred from disk to the static RAM on the 80C32 module. It receives conversion commands from the 186EVKIT program running on the personal computer, controls the conversion cycle, and returns the results. Its operation is transparent to the user. EPROM Resident Program In addition to the two programs supplied with the MAX186 EV kit, a small 80C32 bootstrap program is stored in the EPROM located on the 80C32 board. The EPROM resident program initializes the 80C32, establishes communications over the RS-232 link, checks the static RAM, and downloads the 186RAM program. Its operation starts on power-up and whenever the reset button is pressed. It transmits an identification banner after receiving the first character and then tests the onboard static RAM. The last operation performed by the EPROM resident program is downloading the 186RAM program and storing it in the static RAM. Once the program is fully loaded, control of the 80C32 is transferred to the RAM resident 186RAM program. _______________________________________________________________________________________ 5 Evaluates: MAX186 Reference Adjustment The MAX186 software assumes a reference voltage of 4.096V. This value is used for calculating the displayed results after each conversion. The value can be altered to reflect the exact reference voltage of the MAX186 or to scale the displayed readings. Changing the indicated value does not alter the MAX186’s reference voltage. 6 11 DG413 S1A VSS 27 8 3 16 2 7 6 DG413 S1D 15 14 DG413 S1B 1 JU2 2 3 DG413 S1C C1 10μF EXT VSS C5 0.1μF 9 10 P1.0 +5V 1k 1k 1k 1k 1k 1k 1k 1k 0.1μF 0.1μF 0.1μF 0.1μF 0.1μF 0.1μF 0.1μF 0.1μF SHDN 29 R1 R2 R3 R4 R5 R6 R7 R8 C18 C17 C16 C15 C14 C13 C12 C11 P1.2 CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 5 6 7 8 9 10 1 2 3 4 1 8 N.C. V+ 2 7 CAP+ OSC 3 6 GND LV 4 5 CAP- VOUT ICL7660 U2 MAX186 U1 CH0 VDD CH1 SCLK CH2 CS CH3 DIN CH4 SSTRB CH5 DOUT CH6 DGND CH7 AGND VSS REFADJ SHDN VREF +5V 16 15 14 13 12 11 20 19 18 17 -5V C10 0.01μF C6 10μF C7 0.1μF JU3 5 6 R12 15k R10 5k R13 11k 7 8 10k SIP RESISTOR C9 0.1μF 4 7 +5V C8 10μF C3 10μF C2 10μF JU1 8 +5V R11 100k 87654321 REFADJ VREF H1 28 33 34 31 32 GND 4 GND 3 GND 2 GND 1 SSTRB P1.4 DOUT P1.5 SCLK P1.1 CS P1.6 DIN P1.7 CS Evaluates: MAX186 MAX186 Evaluation System/Evaluation Kit C4 10μF Figure 1. MAX186 EV Kit Schematic _______________________________________________________________________________________ MAX186 Evaluation System/Evaluation Kit Evaluates: MAX186 Figure 2. MAX186 EV Kit Component Placement Guide _______________________________________________________________________________________ 7 Evaluates: MAX186 MAX186 Evaluation System/Evaluation Kit Figure 3. MAX186 EV Kit Component-Side Layout 8 _______________________________________________________________________________________ MAX186 Evaluation System/Evaluation Kit Evaluates: MAX186 Figure 4. MAX186 EV Kit Solder-Side Layout _______________________________________________________________________________________ 9 Evaluates: MAX186 MAX186 Evaluation System/Evaluation Kit 80C32 Module 80C32 Module General Description The Maxim 80C32 microcontroller (µC) module is intended for use with this and other Maxim evaluation kits (EV kits). It contains the 80C32 µC, RS-232 interface, 8kbytes of EPROM, 32kbytes of static RAM, and address decoding logic. A 40-pin connector mates with a connector found on Maxim EV kits designed to interface with the 80C32 module. 80C32 Module Component List DESIGNATION C1, C2 C4, C5, C6, C7, C8, C9, C10, C11, C12 QTY 2 C3, C13, C14 3 D1 J1 J2 R1 RS1 SW1 SW2 IC1 IC2 IC3 IC4 IC5 IC6 IC7 IC8 IC9 IC10 Y1 None 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 None 1 None None 4 1 10 9 DESCRIPTION 15pF ceramic capacitors 0.1µF, 50V ceramic capacitors 22µF, 16V radial electrolytic capacitors 1N4001 diode 40-pin right-angle male connector DB9 right-angle socket 620Ω resistor 10kΩ 10-pin, 9-resistor SIP Power switch Reset switch 80C32 MAX233CPP 27C64 74HCT573 74HCT139 74HCT08 74HCT245 62256 78M05 MAX707CPA 11.059MHz crystal 2-pin power connector 28-pin 600-mil socket for IC3 (the EPROM) Rubber feet 3.00in x 5.50in PCB The module is connected to an IBM-compatible personal computer over a serial communications port. Software provided with each EV kit runs on the computer and controls the unit consisting of the 80C32 module and EV kit. The program uses a routine stored in the 27C64 EPROM to download special 80C32 code for each kit. The downloaded code controls the EV kit and, together with the program running on the personal computer, displays the output data. The board operates from a single 8V to 22V supply. Both the pre-regulated and regulated +5V levels are available to the EV kit through the 40-pin connector. 80C32 Module Power Supply The Maxim 80C32 module requires an input of 8V to 22V for normal operation. An on-board 78M05 power regulator supplies the 5V required for the logic on the module, and any 5V requirements for the EV kit attached to the 40-pin connector. The pre-regulated voltage is also available on the data connector. The source must be capable of supplying 100mA for the module and meeting the load requirements of the EV kit. Microprocessor Supervisor 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. A watchdog function was not included because they frequently interfere while debugging programs, and debugging is a prime function of this board. 80C32 Microcontroller The 80C32 is a member of the popular Intel 8051 family of µCs. It is a low-power CMOS version that requires external ROM for program storage, 256 bytes of internal RAM, and four 8-bit I/O ports. Three of the ports are required by the system for serial communications and memory control. The fourth port (P1) is available through the data connector. The 80C32 communicates with the PC over a serial RS232 link. A MAX233 acts as a level shifter between the ±15V RS-232 signals and the TTL levels of the 80C32. ______________________________________________________________________________________ MAX186 Evaluation System/Evaluation Kit Port 0 (pins 32-39) of the 80C32 multiplexes the lower eight bits of memory address and the eight bits of read/write data. The lower eight bits of address data are latched during each I/O cycle by the 74HCT573 octal latch. The latch is controlled by the address latch enable (ALE) signal of the 80C32. Port 2 (pins 21-28) of the 80C32 supplies the upper eight bits of address information. The port 3 pins (10-17) provide several unrelated functions. Pins 10 and 11 are used as the receive data (RxD) and transmit data (TxD) pins of the RS-232 link. Pins 16 and 17 act as the write (WR) and read (RD) control signals for the data I/O cycles. Four other pins are configured as interrupt and timer controls, but are not used on this board. Memory The board has a 27C64 EPROM containing code for initializing the 80C32 and downloading additional program code to the 62256 RAM. After a reset, the EPROM resident code initializes the 80C32, determines the address range of the RAM, sets the RS-232 baud rate to 1200, and waits for communications from the PC. Receiving any character will prompt the program to send an initial banner that includes the program name, revision level, and boundaries of the on-board RAM. The 62256 CMOS (32kbyte) static RAM is used to hold program code for the various Maxim EV kits that use the 80C32 module as the controller. Programs are transferred from disk to the RAM using software running on a personal computer, such as MAXLOAD or other programs provided with Maxim EV kits. Programs written to execute from this RAM start at 4000 (HEX) and are typically less than 4kbytes long. The remaining RAM is available for data storage. Address Ranges Logic on the module board generates various enable signals for different address ranges. The ROM and RAM enable signals are fed directly to the respective chips. Several additional signals (CS0-CS3) are available on the data connector to be used by Maxim EV kits. Table 1 outlines the address range for each of the elements found on the 80C32 module. Table 1. Address Ranges in Hexadecimal ADDRESS RANGE (HEX) 0000 4000 C000 D000 E000 F000 ➔ ➔ ➔ ➔ ➔ ➔ ENABLE SIGNAL 3FFF BFFF CFFF DFFF EFFF FFFF ROM RAM CS0 CS1 CS2 CS3 Data I/O Connector A 40-pin connector mounted on the edge of the PCB provides connection between the µC module and other Maxim EV kits. Both power and digital signals are transferred via the connector. To join the module board with an EV kit, carefully align and insert the pins on the connector with the mating 40-pin female connector of the kit. The pin functions are listed in Table 2. Table 2. I/O Connector Pin Functions PIN 1-4 5, 6 7, 8 9 10 11 12 13 14 15-18 19-26 27-34 35-40 FUNCTION Ground Pre-regulator input Regulated +5V RD WR CS0 CS1 CS2 CS3 ADDR0-ADDR3 DB0-DB7 P1.0-P1.7 Reserved DESCRIPTION Read strobe Write strobe Address C000-CFFF Address D000-DFFF Address E000-EFFF Address F000-FFFF Lowest 4 bits of address 8-bit data bus 8 bits of port 1 ______________________________________________________________________________________ 11 Evaluates: MAX186 The MAX233 also generates the output voltages necessary to drive RS-232 lines. Evaluates: MAX186 MAX186 Evaluation System/Evaluation Kit Software Architecture Software for EV kits using the Maxim 80C32 module is divided into three elements: the interface program running on an IBM-compatible PC, a module program located in EPROM, and a program supplied on disk that is transferred to the RAM located on the module. EPROM Resident Program The EPROM resident program initializes the 80C32, establishes communications over the RS-232 link, verifies the static RAM, and downloads other programs. Its operation starts on power-up and whenever the reset button is pressed. After reset, the program waits indefinitely to receive a character over the RS-232 port. When the first character is received, a logon banner identifying the module and firmware revision is transmitted. 12 Immediately following transmission of the logon banner, the program runs a checker routine for the on-board 256kbit static RAM. The RAM is filled with several patterns and then read to verify that each pattern has been retained. A pass or fail indication is displayed on the personal computer after each pass. EV kit software requires proper operation of the RAM. Do not attempt to use the board if any of the RAM checks fail. Two other programs for the EV kits are provided on a floppy disk shipped with each kit. One program acts as the user interface and transmits commands to the 80C32 module. The other is an 80C32 application program that executes from the RAM located on the module. The procedure for loading the programs varies with each kit, so follow the instructions provided. ______________________________________________________________________________________ MAX186 Evaluation System/Evaluation Kit Evaluates: MAX186 Figure 5. 80C32 Module Component Placement Guide (x2) ______________________________________________________________________________________ 13 Evaluates: MAX186 MAX186 Evaluation System/Evaluation Kit 34 P1.0-P1.7 27-34 ALL D9 MNEMONICS REFER TO THE HOST (DTE) 5 GND 1 DCD 4 DTR 6 DSR 27 2 TXD 3 RXD 7 RTS 8 CTS MAX233A U2 +5V 2 +5V 5 T1 OUT T1IN 18 T2 T2 4 R1OUT R1 IN 19 R2IN R2OUT OUT 11 IN C1+ C2+ 15 C1C2+ 10 VC216 VC2GND GNDV+ 6 2 1 3 20 8 13 12 17 14 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 9 9 MAX707 +5V U10 1 MR RESET 2 RESET V SW1 3 CC GND N.C. RESET 4 PFO PFI P1.0 P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7 RXD TXD -INT0 -INT1 T0 T1 -WR -RD RST C1 27pF18 8 7 6 5 AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD7 ALE -EA A15 A14 A13 A12 A11 A10 A9 A8 39 38 37 36 35 34 33 32 30 31 28 27 26 25 24 23 22 21 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 11 2 1 Q1 D1 3 4 74HCT 5 573 6 U4 7 D 8 9 D8 Q8 19 18 17 16 15 14 13 12 15 14 13 12 11 10 9 8 XTAL2 29 XTAL1 -PSEN XX1 11.059MHz C2 1 U6 HCT08 27pF 3 2 +5V 4 U6 HCT08 6 +5V 12 5 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 8 9 10 11 12 13 10 9 8 7 6 5 4 3 25 24 21 23 2 26 22 20 A0 O0 A1 O1 A2 O2 A3 O3 A4 O4 A5 O5 A6 O6 A7 O7 A8 27C64 A9 U3 A10 A11 VPP A12 N.C./A13 PCM C E 11 12 13 15 16 17 18 19 +5V 1 27 19 14 2 A0 0 3 A1 U5 1 15 HCT139 2 1 EN 3 4 5 6 7 9 U6 HCT08 8 10 11 13 U6 HCT08 Figure 6. 80C32 Module Schematic 14 ______________________________________________________________________________________ MAX186 Evaluation System/Evaluation Kit +5V RS1 U8 62256 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 10 9 8 7 6 5 4 3 25 24 21 23 2 26 1 20 22 27 A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 -CS -OE -WR I/O1 I/O2 I/O3 I/O4 I/O5 I/O6 I/O7 I/O8 11 12 13 15 16 17 18 19 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 1 19 2 DIR EN B1 3 A1 4 74HCT 5 /245 6 U7 7 H 8 9 A8 B8 10k 18 17 16 15 14 13 12 11 12 0 11 1 LS139 10 2 U5 15 9 EN 3 13 ADDR0-4 15-18 DB00-DB07 19-26 14 A0 13 A1 12 3 Evaluates: MAX186 0 1 2 -CS0 - -CS3 11-14 -RD 9 -WR 10 RESERVED 35-40 +5V POWER LED R1 620Ω 70M05 U9 C4-C12 0.1μF + C3 47μF + C13 47μF VOUT VIN +5V 7-8 V++ 5-6 SW2 POWER SWITCH VIN POWER CONNECTOR C14 47μF GND GND 1-4 Figure 6. 80C32 Module Schematic (continued) ______________________________________________________________________________________ 15 Evaluates: MAX186 MAX186 Evaluation System/Evaluation Kit Figure 7. 80C32 Module Component-Side Layout (x2) 16 ______________________________________________________________________________________ MAX186 Evaluation System/Evaluation Kit Evaluates: MAX186 Figure 8. 80C32 Module Solder-Side Layout (x2) ______________________________________________________________________________________ 17 Evaluates: MAX186 MAX186 Evaluation System/Evaluation Kit Revision History REVISION NUMBER REVISION DATE 0 — 1 1/96 — 2 6/08 Deleted references to obsolete DOS software. DESCRIPTION Initial release PAGES CHANGED — — 1, 2, 4–7 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 18 © 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.