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19-2467; Rev 0; 4/02
MAX1236 Evaluation Kit
General Description
The MAX1236 evaluation kit (EV kit) is designed to evaluate the MAX1236. The MAX1236 is a 12-bit, four-channel (two differential-channel) ADC with a 2-wire serial interface. The MAX1236 EV kit board supports three standard 2-wire interface speeds: standard mode (S-Mode), fast mode (F-Mode), and high-speed mode (HS-Mode). The software provided with this EV kit only supports S-Mode. The Windows(R) 95/98 software provided with the EV kit uses the parallel (printer) port of an IBM-compatible PC to emulate a processor with a 2-wire interface (S-Mode). The Windows software also provides a friendly graphicaluser interface (GUI) to exercise the features of the MAX1236 with control buttons and menus. Order the MAX1236EVKIT for comprehensive evaluation of the MAX1236 using a personal computer with an available parallel port. o Proven PC Board Layout o Windows 95/98 Software o 2-Wire Serial Interface o Fully Assembled and Tested
Features
Evaluates: MAX1236
Ordering Information
PART MAX1236EVKIT TEMP RANGE 0C to +70C IC PACKAGE 8 MAX
MAX1236 EV Kit Files
FILE INSTALL.EXE MAX1236.EXE DESCRIPTION Installation program Application program
Component Suppliers
SUPPLIER Diodes Inc. TDK PHONE 805-446-4800 847-803-6100 WEBSITE www.diodes.com www.component.tdk.com
Windows is a registered trademark of Microsoft Corp.
Note: Please indicate you are using the MAX1236 when contacting these component suppliers.
Component List
DESIGNATION C1-C4 QTY 4 DESCRIPTION 0.22F 10%, 16V X7R ceramic capacitors (0603) TDK C1608X7R1C224KT 100pF 5%, 50V COG ceramic capacitor (0603) TDK C1608C0G1H101JT 0.1F 10%, 16V X7R ceramic capacitors (0603) TDK C1608X7R1C104KT 10F 20%, 16V X5R ceramic capacitors (1210) TDK C3225X5R1C106M Zener diodes, Vz = 5.1V (3-pin SOT23) Diodes Inc. BZX84C5V1 3-pin SOT23 top mark KZ2 Surface-mount ferrite bead (0603) TDK MMZ1608B601C DESIGNATION J1 R1-R4 R5, R7 R6, R8, R9, R13 R10, R12, R14, R16 R11, R15 U1 U2 QTY 1 4 2 4 4 2 1 1 DESCRIPTION Male DB-25 right-angle plug Mouser 152-3325 14 1% resistors (0603) Open (1206) (not installed) 47k 5% resistors (1206) 100 5% resistors (1206) 4.7k 5% resistors (0603) MAX1236EUA (8-MAX) Open-collector logic inverter (14-pin SO) SN74HC05 PC board, MAX1236 evaluation kit 3.5in software disk, MAX1236 evaluation kit MAX1236 data sheet
C5
1
C6, C9
2
C7, C8
2
D1-D4
4
None None None
1 1 1
FB1
1
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642,or visit Maxim's website at www.maxim-ic.com.
MAX1236 Evaluation Kit Evaluates: MAX1236
Quick Start
Recommended Equipment
Before you begin, the following equipment is needed: * A fixed +5VDC power supply * An IBM-compatible PC with Windows 95/98 * An available parallel port (DB-25 female connector on back of PC) * A standard 25-pin, straight-through male-to-female cable to connect the computer's parallel port to the MAX1236 EV kit board of the reference. The CLK bit selects either internal clock or external clock mode. The UNI/BIP bit selects either unipolar or bipolar mode. Setting RST to zero resets the configuration register. The setup register remains unchanged. The X Don't Care bit can be ignored. Refer to the MAX1236 data sheet for more information on the SEL2, SEL1, and SEL0 bits within the Setup Byte.
Config Byte
The Config Byte always begins with a start bit value of zero. The SCAN1 and SCAN0 bits select the scanning mode. The CS1 and CS0 bits select one of the four analog input channels. The CS3 and CS2 bits are ignored by the MAX1236. The SE/DIFF bit selects either singleended or differential mode. See the MAX1236 data sheet for more information on the SCAN1, SCAN0, CS3, CS2, CS1, and CS0 bits within the Config Byte.
Procedure
1) Connect a cable from the computer's parallel port to the MAX1236 EV kit board. Use a 25-pin straightthrough, female-to-male cable. 2) Install the MAX1236 EV kit software on your computer by running the INSTALL.EXE program on the floppy disk. The program files are copied and icons are created in the Programs section within the START menu. 3) Connect a +5VDC power supply between the 5V and the GND pads of the MAX1236 EV kit board. 4) Start the MAX1236 EV kit program by clicking its icon in the Programs section within the START menu. 5) Apply an analog input voltage (0 to VREF) between the AIN0 and GND pads of the MAX1236 EV kit board. 6) The program automatically detects the MAX1236 EV kit board and displays 2-Wire Hardware Detected in green. The AIN0 label automatically displays the voltage applied to the pad labeled AIN0 on the MAX1236 EV kit board.
Reference Voltage
The evaluation software assumes a +4.096V reference voltage, unless otherwise specified. To override the internal 4.096V reference value, ensure bit SEL2 equals zero and bit SEL1 equals one within the Setup Byte. Then, apply the new reference voltage at the VREF pad on the board, type in the new reference voltage, without the volt unit, and press the Set Vref button. The EV kit software uses the value typed in the Vref field to translate the digital code to a voltage.
Keyboard Navigation
When you type on the keyboard, the system must know which control should receive the keystrokes. Press the TAB key to move the keyboard's focus from one control to the next. The focused control is indicated by a dotted outline. SHIFT + TAB moves the focus to the previously focused control. Buttons respond to the keyboard's SPACE bar. Some controls respond to the keyboard's UP and DOWN arrow keys. Activate the program's menu bar by pressing the F10 key, and then press the letter of the menu item you want. Most menu items have one letter underlined, indicating their shortcut key.
Detailed Description of Software
The evaluation software's main window (Figure 1) controls the setup byte. It also displays the voltage and output code of the input signal(s), depending on the configuration of the MAX1236.
Read ADC
The Read ADC button manually reads the MAX1236 while using the current setup and configuration byte settings. When the AutoRead checkbox is checked, the software automatically reads the MAX1236 approximately every 300ms. AutoRead allows users to modify the setup and configuration bytes on the fly without having to manually press the Read ADC button each time.
Setup Byte
The Setup Byte always begins with a start bit value of one. The SEL2, SEL1, and SEL0 bits control the state
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MAX1236 Evaluation Kit
Detailed Description of Hardware
The MAX1236 is a four-channel (two differential-channel) 12-bit ADC with a 2-wire serial interface. The opencollector inverter (U2) interfaces the PC parallel port to the 2-wire serial interface. U2 and the associated circuitry are only required when interfacing to the parallel port. Power the MAX1236 EV kit from a 5VDC power supply. To prevent damage to the MAX1236 EV kit, do not exceed +5.5VDC on the supply. 1) Disconnect the MAX1236 EV kit from the PC parallel port. 2) Install 3k resistors at locations R5 and R7. (This resistor value may require optimization for each system.) 3) Connect the user-supplied 2-wire bus to the SDA, SCL, and GND pads. (Connect to the GND pad nearest the 5V pad on the MAX1236 EV kit board.) 4) Refer to the MAX1236 data sheet to ensure all timing specifications are met.
Evaluates: MAX1236
User-Supplied 2-Wire Interface
The MAX1236 EV kit provides a proven PC board layout and software to evaluate the features of the MAX1236. The Windows software only supports a 2-wire serial interface in S-Mode. To evaluate the MAX1236 with a user-supplied 2-wire serial interface in F-Mode or HS-Mode, do the following:
NOTE: MAX1236 EVALUATION SOFTWARE'S MAIN WINDOW CONTROLS THE MAX1236 AND DISPLAYS CONVERSION RESULTS.
Figure 1. MAX1236 EV Kit Software Main Window
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MAX1236 Evaluation Kit Evaluates: MAX1236
5V 5V C7 10F FB1 DVDD
GND
5V SDA SDA SCL SCL 5 SCL AINO 6 SDA VDD 8 C5 100pF C6 0.1F R1 14 1% C1 0.22F 2 C2 0.22F 3 C3 0.22F 4 C4 0.22F VREF GND GND GND
1
AIN0
U1 MAX1236
AIN1
R2 14 1%
AIN1
R3 14 1%
AIN2
AIN2
7
R4 14 1%
AIN3
GND
AIN3/REF
Figure 2. MAX1236 EV Kit Schematic (Sheet 1 of 2)
4
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MAX1236 Evaluation Kit Evaluates: MAX1236
DVDD J1-5 J1-13 J1-18 J1-19 J1-20 J1-21 J1-22 J1-23 J1-DB-25 CONNECTOR J1-24 J1-25 N.C. N.C. N.C. J1-12 N.C. D3 N.C. N.C. N.C. N.C. N.C. N.C. N.C. J1-2 R16 100 D4 9 8 U2-D 74HC05 U2-E 74HC05 10 U2-F 74HC05 11 13 7 J1-3 R12 100 D2 3 J1-11 D1 R10 100 U2-B 74HC05 4 R9 47k 2 U2-A 74HC05 1 R6 47k R5 OPEN SDA DVDD DVDD
R11 4.7k
DVDD DVDD R14 100 R13 47k 6 U2-C 74HC05 5 R8 47k R7 OPEN SCL DVDD DVDD
J1-1 J1-4 J1-6 J1-7 J1-8 J1-9 J1-17 J1-16 J1-15 J1-14 J1-10
14 12 C9 0.1F C8 10F
R15 4.7k
Figure 2. MAX1236 EV Kit Schematic (Sheet 2 of 2)
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MAX1236 Evaluation Kit Evaluates: MAX1236
1.0"
Figure 3. MAX1236 EV Kit Component Placement Guide-- Component Side
1.0"
Figure 4. MAX1236 EV Kit PC Board Layout--Component Side
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MAX1236 Evaluation Kit Evaluates: MAX1236
1.0"
Figure 5. MAX1236 EV Kit 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.
7 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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