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Part: MAX191EVKIT
Category:
Others
Description: Evaluation System/evaluation Kit For Max191
Company: Maxim Integrated Products
Datasheet: Download MAX191EVKIT datasheet File size : 649 kB
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Datasheet text preview:
19-4506; Rev 4; 2/97
MAX191 Evaluation System/Evaluation Kit
General Description
The MAX191 evaluation system (EV system) consists of a MAX191 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 MAX191 EV kit. Both boards come fully assembled and tested. The MAX191 EV system can configure the MAX191 in a variety of ways: It can operate in serial- or parallel-interface mode and in unipolar or bipolar mode, and VSS can be connected to ground or -5V. All functions are controlled through keyboard commands entered on the personal computer. The MAX191 EV system supersedes the MAX190 EV kit. The MAX190 kit was limited to the positive input range (0V to +4.096V) and serial-interface mode only. Order the EV system (MAX191EVSYS-DIP) to evaluate t h e MAX191 using software. Order the EV kit (MAX191EVKIT-DIP) if the 80C32 module (80C32MODULE-DIP) has already been purchased separately or with another Maxim EV system. The MAX191 EV kit alone can be used for limited evaluation of the MAX191 (see the EV Kit Quick Start section).
Features
o EV System Includes EV Kit and 80C32 µC Module o 12-Bit Resolution, 1/2LSB Linearity ADC o MAX191 Operates in Single- or Dual-Supply Mode o EV System Operates in: Unipolar- or Bipolar-Input Mode Serial- or Parallel-Interface Mode o Fully Assembled and Tested o Software Source-Code Provided o Interfaces to IBM-Compatible Computer through RS-232 Communications Port o Kit Supports Conversion Rates Beyond 50ksps
Evaluates: MAX191
Ordering Information
PART MAX191EVSYS-DIP MAX191EVKIT-DIP 80C32MODULE-DIP 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
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MAX191 Evaluation System/Evaluation Kit Evaluates: MAX191
EV System Component List
QTY 1 1 DESCRIPTION MAX191 evaluation kit (MAX191EVKIT-DIP) Maxim 80C32 µC module (80C32MODULE-DIP)
EV Kit Component List
DESIGNATION C1 C2, C3, C4, C5, C6, C13 C7 C8, C9, C11, C12, C14 C10 R1, R2 RS1 U1 U2 U3 U4 H1 J1 None None None QTY 1 6 1 5 1 2 1 1 1 1 1 1 1 1 1 1 DESCRIPTION 200pF ceramic capacitor 10µF 16V electrolytic capacitors 22µF ceramic capacitor 0.1µF ceramic capacitors 0.01µF ceramic capacitor 1k 5% resistors 10k 9-resistor SIP 74HCT157A Maxim DG413DJ Maxim ICL7660CPA Maxim MAX191BCNG 10-pin header Female data connector Software on 5 1/4" floppy disk 3.00" x 3.00" PC board MAX191 data sheet
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. The Maxim 80C32 module requires approximately 100mA. The MAX191 evaluation board draws less than 10mA. 5) Connect a cable from the personal computer to the 9-pin connector on the 80C32 module. If the serial port on the personal computer has a standard 9-pin c o n n e c t o r , a straight-through cable is used to attach the board. Computers with a 25-pin serial port connector need an adapter or adapter cable (D25 female to D9 male); both are available at most computer stores. 6) Turn on the power to the 80C32 module. The switch is located near the 2-pin power connector. The LED indicates power from the on-board regulator. 7) To start the Maxim EV system software on the personal computer, set the default drive or directory to match the storage location of the Maxim programs, then enter the program name "191EVKIT". 8) Set the active serial port, shown on the bottom line, to indicate the port connected to the Maxim 80C32 module. The Ctrl-T command toggles the active p o r t between COM1 and COM2. A list of commands affecting the communications link appears at the bottom of the screen. 9) The 80C32 module will transmit a logon message and RAM test results when communications are initialized. The MAX191 RAM resident program will then be downloaded automatically. The system is ready for use when the MAX191 revision banner appears and the status indication on the bottom display line changes to "*** READY ***". 10) Enter a "?" to display a menu of available MAX191 conversion commands. This help list is available whenever the MAX191 system is ready for use. 11) Connect an analog input across the MAX191 inputs (AIN+ and AIN-). The input range is 0V to +4.096V f o r unipolar and -2.048V to +2.047V for bipolar operation. 12) S i n g l e conversions are displayed whenever the Enter key is pressed. Continuous conversions are initialized with a "C" and continue until any key is pressed.
EV System Quick Start
The MAX191 EV system includes a Maxim 80C32 µC module and a MAX191 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 MAX191 EV kit. The following steps outline the procedure for using the MAX191 EV system: 1) Copy the MAX191 software disk to another disk or to a hard-disk directory in the personal computer. Store the original disk in a safe location. 2) Read the README text file found on the floppy disk. It contains information on any hardware or software changes made after this manual was written. 3) Connect the MAX191 evaluation board to the 40-pin data connector on the Maxim 80C32 module.
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MAX191 Evaluation System/Evaluation Kit
EV Kit Quick Start
W i t h o u t the 80C32 module, the MAX191 evaluation board can perform a limited evaluation of the MAX191 using external signals. To evaluate the device in the serial-interface mode, refer to the timing diagram in Figure 10b of the MAX191 data sheet and connect the board as follows: 1) Connect a +5V power supply to the marked pads (GND and +5V) on the board. 2) Ground the PAR pin on the 10-pin header to set the MAX191 in the serial-interface mode. 3) Connect the clock signal (0.1MHz to 1.6MHz) to the SCK pin on the 10-pin header. 4) Connect the chip-select signal (CS) to the serial chip-select pin (SCS) on the 10-pin header. 5) C o n n e c t an oscilloscope to the serial data pin (SDAT) on the 10-pin header. 6) The MAX191 VSS voltage can be changed to -5V by grounding the VSS select pin (VSEL) on the 10-pin header. The VSS voltage is 0V when this pin is left open. 7) Leaving the BIP pin of the 10-pin header open will operate the MAX191 in bipolar mode. Grounding the pin will change the mode to unipolar.
Evaluates: MAX191
Table 1. Port 1 Bit Functions
BIT P1.0 P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7 NAME SCK VSEL BSY PAR BIP HBE SRD SCS FUNCTION Clock signal for serial mode Selects 0V or -5V for MAX191's VSS pin: Low = 0V, High = -5 The MAX191 BUSY output The MAX191 PARallel mode select pin. Also controls the 74HCT157 multiplexer. The MAX191 BIPolar pin The MAX191 HBEN (high-byte enable) pin The MAX191 D7/SDATA (serial data) pin Serial mode chip-select signal
Interface Modes
Communications between the 80C32 module and the MAX191 can be in serial or parallel mode. A 74HC157 multiplexer is used to toggle the MAX191 chip-select signal (CS) between the serial chip select (SCS, P1.7) and a decoded address signal (CS0). In either mode, the MAX191 BIP, PAR, and HBEN pins are controlled by the 80C32 port 1 programmable bits. In serial mode, port 1 also toggles the clock pin and receives the serial data. Table 1 lists the functions of the port 1 bits.
_______________Detailed Description
VSS Circuit
An ICL7660 +5V to -5V converter and a DG413 analog switch are the means for switching the MAX191'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. The MAX191 requires a negative supply only if the input voltage is expected to go below ground. The ICL7660 provides a -5V source with minimal additional circuitry. The ICL7660 converter circuit on the MAX191 EV kit is the standard application circuit for +5V to -5V conversions. Its 10mA output capacity is much more than the 100µA needed for the MAX191 EV kit. The additional current is available for user circuits in t h e prototyping area. For applications where the MAX191 is the only load, the 10µF capacitors may be reduced to 0.1µF.
Reference Circuit
The MAX191 EV kit is configured to operate with the MAX191's internal 4.096V reference, using external refe r e n c e compensation mode (PD p i n floating--see MAX191 data sheet). Access to the PD pin is provided via connector location JJ1. To evaluate the MAX191 in internal reference compens a t i o n mode, remove the reference compensation capacitors C7 and C11, and force the PD pin high at location JJ1. To place the MAX191 in its low-current power-down mode, connect PD to ground using JJ1.
Monitoring the MAX191 Supply Current
A jumper position (JJ2) included on the MAX191 EV kit printed circuit board provides a convenient place to monitor the MAX191's VDD supply current. To insert a current meter, cut the trace across the position marked
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