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19-2479; Rev 0; 6/02
MAX1238 Evaluation Kit
General Description
The MAX1238 evaluation kit (EV kit) is designed to evaluate the MAX1238. The MAX1238 is a 12-bit, 12-channel (six differential-channel) ADC with a 2-wire serial interface. The MAX1238 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 provided Windows(R) 95/98 software 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 MAX1238 with control buttons and menus. Order the MAX1238 EV kit for comprehensive evaluation of the MAX1238 using a personal computer with an available parallel port. o Proven PC Board Layout o Windows 95/98 Evaluation Software o 2-Wire Serial Interface o Fully Assembled and Tested
Features
Evaluates: MAX1238
Ordering Information
PART MAX1238EVKIT TEMP RANGE 0C to +70C IC PACKAGE 16 QSOP
MAX1238 EV Kit Files
INSTALL.EXE MAX1238.EXE 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 MAX1238 when contacting these component suppliers.
Component List
DESIGNATION C1-C4, C10-C17 QTY 12 DESCRIPTION 0.22F 10%, 10V X7R ceramic capacitors (0603) TDK C1608X7R1A224KT 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 Diodes Inc. BZX84C5V1 3-pin SOT23 top mark KZ2 Surface-mount ferrite bead (0603) TDK MMZ1608B601C DESIGNATION J1 R1-R4, R17-R24 R5, R7 R6, R8, R9, R13 R10, R12, R14, R16 R11, R15 U1 U2 None None None QTY 1 12 2 4 4 2 1 1 1 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) MAX1238EEE (16-pin QSOP) Open-collector logic inverter (14-pin SO) SN74HC05D PC board, MAX1238 EV kit 3.5in software disk, MAX1238 EV kit MAX1238 data sheet
C5
1
C6, C9
2
C7, C8
2
D1-D4
4
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.
MAX1238 Evaluation Kit Evaluates: MAX1238
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 MAX1238 EV kit board 3) Connect a +5VDC power supply between the +5V and the GND pads of the MAX1238 EV kit board. 4) Start the MAX1238 EV kit program by clicking its icon in the Programs section within the Start menu. 5) Apply an analog input voltage (0V to +V REF ) between the AIN0 and GND pads of the MAX1238 EV kit board. 6) The program automatically detects the MAX1238 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 MAX1238 EV kit board.
Procedure
1) Connect a cable from the computer's parallel port to the MAX1238 EV kit board. Use a 25-pin straightthrough, female-to-male cable. 2) Install the MAX1238 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.
Detailed Description of Software
The evaluation software's main window (shown in Figure 1) controls the setup byte and configuration byte. It also displays the voltage and output code of the input signal(s), depending on the configuration of the MAX1238.
Figure 1. MAX1238 Evaluation Software Main Window 2 _______________________________________________________________________________________
MAX1238 Evaluation Kit
Read ADC
The Read ADC button manually reads the MAX1238 while using the current setup and configuration byte settings. When the AutoRead checkbox is checked, the software automatically reads the MAX1238 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.
Detailed Description of Hardware
The MAX1238 is a 12-channel (six differential-channel) 12-bit ADC with a 2-wire serial interface. The open-collector 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 MAX1238 EV kit from a +5VDC power supply. To prevent damage to the MAX1238 EV kit, do not exceed +5.5VDC on the supply.
Evaluates: MAX1238
Setup Byte
The Setup Byte always begins with a start bit value of one. The SEL2, SEL1, and SEL0 bits control the state 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 MAX1238 data sheet for more information on the SEL2, SEL1, and SEL0 bits within the Setup Byte.
User-Supplied 2-Wire Interface
The MAX1238 EV kit provides a proven PC board layout and software to evaluate the features of the MAX1238. The Windows software only supports a 2-wire serial interface in S-Mode. To evaluate the MAX1238 with a user-supplied 2-wire serial interface in F-Mode or HS-Mode, do the following: 1) Disconnect the MAX1238 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 MAX1238 EV kit board.) 4) Refer to the MAX1238 data sheet to ensure all timing specifications are met.
Config Byte
The Config Byte always begins with a start bit value of zero. The SCAN1 and SCAN0 bits select the scanning mode. The CS3, CS2, CS1, and CS0 bits select one of the 12 analog input channels. The SE/DIFF bit selects either single-ended or differential mode. Refer to the MAX1238 data sheet for more information on the SCAN1, SCAN0, CS3, CS2, CS1, and CS0 bits within the Config Byte.
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 keys. 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.
_______________________________________________________________________________________ 3
MAX1238 Evaluation Kit Evaluates: MAX1238
DVDD +5V SDA SDA 10 SCL SCL R1 14 1% R2 14 1% R3 14 1% R4 14 1% R17 14 1% R18 14 1% C1 0.22F 2 C2 0.22F 3 C3 0.22F 4 C4 0.22F 5 C10 0.22F 6 C11 0.22F AIN1 AIN10 9 SCL AIN8 16 C14 0.22F 15 C15 0.22F 14 C16 0.22F R24 14 1% C17 0.22F R20 14 1% C13 0.22F 7 C12 0.22F R19 14 1% SDA VDD 12 C5 100pF C6 0.1F R21 14 1% R22 14 1% C7 10F FB1 +5V
AIN8
AIN0
1
AIN0
AIN9
U1
AIN9
AIN1
MAX1238
R23 14 1%
AIN10 VREF
AIN2
AIN2 REF/AIN11 AIN3 GND 13 11
AIN11 GND
AIN3
AIN4
AIN4
AIN7
8
AIN7
AIN5
AIN8
AIN5
AIN6
Figure 2. MAX1238 EV Kit Schematic (Sheet 1 of 2)
4
_______________________________________________________________________________________
MAX1238 Evaluation Kit Evaluates: MAX1238
J1-5 DVDD J1-13 J1-18 J1-11 J1-19 J1-20 J1-21 J1-22 J1-23 J1-24 J1-DB-25 CONNECTOR J1-25 J1-3 1 3 1 D1 R12 100 3 D2 R11 4.7k U2-B 74HC05 3 4 14 C9 0.1F C8 10F 11 R10 100 R9 U2-A 47k 74HC05 2 1 R6 47k R5 OPEN SDA U2-E 74HC05 10 DVDD DVDD DVDD
J1-1 J1-4 J1-6 J1-7 J1-8 J1-9 J1-10 J1-14 J1-15 J1-16 J1-17
N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C.
DVDD
DVDD
DVDD
13
7 12 U2-F 74HC05
J1-12 R14 100 3 1 D3 R16 100 3 J1-2 D4 1
R13 U2-C 47k 74HC05 6 5
R8 47k
R7 OPEN SCL
U2-D 74HC05 9 R15 4.7k 8
N.C. N.C.
Figure 2. MAX1238 EV Kit Schematic (Sheet 2 of 2)
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5
MAX1238 Evaluation Kit Evaluates: MAX1238
1.0"
Figure 3. MAX1238 EV Kit Component Placement Guide-- Component Side
1.0"
Figure 4. MAX1238 EV Kit PC Board Layout--Component Side
6
_______________________________________________________________________________________
MAX1238 Evaluation Kit Evaluates: MAX1238
1.0"
Figure 5. MAX1238 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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