Maxim MAX1415EUE User Manual

19-3084; Rev 0; 12/03  
MAX1416 Evaluation Kit/  
Evaluation System  
General Description  
The MAX1416 evaluation kit (EV kit) is an assembled and  
tested circuit board that demonstrates the MAX1416  
multichannel, 16-bit, sigma-delta data-acquisition system.  
Windows 98/2000/XP software provides a convenient  
user interface to exercise the features of the MAX1416.  
Features  
Proven PC Board Layout  
Complete Evaluation System  
®
Convenient On-Board Test Points  
Fully Assembled and Tested  
Order the complete evaluation system (EV system)  
(MAX1416EVC16) for a comprehensive evaluation of the  
MAX1416 using a personal computer. Order the EV kit  
(MAX1416EVKIT) if the 68HC16MODULE-DIP has been  
purchased with a previous Maxim EV system, or for cus-  
tom use in other microcontroller (µC)-based systems.  
Ordering Information  
PART  
TEMP RANGE INTERFACE TYPE  
To evaluate the MAX1415, request a free sample of the  
MAX1415EUE. To evaluate the MX7705, request a free  
sample of the MX7705EUE.  
MAX1416EVC16  
MAX1416EVKIT  
0°C to +70°C  
0°C to +70°C  
Windows software  
User supplied  
Note: The MAX1416 software is designed for use with the com-  
plete EV system (MAX1416EVC16). It includes a 68HC16MOD-  
ULE-DIP module and a MAX1416EVKIT. If the MAX1416 evalua-  
tion software is not used, the MAX1416EVKIT board can be pur-  
chased by itself, without the µC.  
MAX1416EVC16 System  
Component List  
PART  
QTY  
DESCRIPTION  
MAX1416 evaluation kit  
68HC16 µC module  
MAX1416EVKIT  
68HC16MODULE-DIP  
1
1
MAX1416EVKIT Parts List  
REFERENCE  
H1  
QTY  
1
DESCRIPTION  
8-pin header  
REFERENCE  
QTY  
DESCRIPTION  
C1–C4, C10,  
C11  
0.01µF, 10V X7R ceramic capacitors  
(radial leaded)  
6
J1  
1
2 x 20 right-angle socket  
2-pin header  
JU1  
1
0.01µF 10%, 50V X7R ceramic  
capacitor (0603)  
Taiyo Yuden UMK107B103KZ  
TDK C1608X7R1H103KT  
JU2  
1
2-pin header  
C5  
1
JU3  
1
3-pin header  
JU4  
1
2-pin header  
JU1–JU4  
R1–R4  
R5, R6  
TB1  
4
Shunts  
4.7µF 20%, 10V X5R ceramic  
capacitor (1206)  
Taiyo Yuden LMK316BJ475ML  
TDK C3216X5R1A475MT  
4
105% resistors (axial leaded)  
105% resistors (1206)  
0.200in 2-circuit screw terminal  
C6  
C7, C8  
1
2
3
1
2
1
22pF 5%, 50V C0G ceramic  
capacitors (0603)  
TDK C1608C0G1H220J  
0.200in 3-circuit screw terminal  
blocks  
TB2, TB3  
2
U1  
U2  
1
1
2
MAX1416EUE  
MAX873ACSA  
MAX1840EUB  
0.1µF 10%, 50V X7R ceramic  
capacitors (0805)  
Taiyo Yuden UMK212BJ104KG  
TDK C2012X7R1H104KT  
U3, U4  
C9, C12, C13  
C14  
4.9152MHz crystal (HC49/US),  
parallel resonant, 20pF load  
ECS 49-20-4  
Y1  
1
1µF, 10V X7R ceramic capacitor  
(0805)  
TDK C2012X7R1A105K  
None  
None  
1
1
MAX1416 PC board  
Software disk, MAX1416  
Evaluation Kit  
Windows is a registered trademark of Microsoft Corp.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
MAX1416 Evaluation Kit/  
Evaluation System  
The Setup, Clock, Offset, and Gain tab sheets provide  
read/ write access to each of the registers. See  
Figures 2–5.  
Evaluating the MAX1415  
To evaluate the MAX1415, request a free sample of the  
MAX1415EUE and replace U1. Follow the Quick Start  
procedure, with the following exceptions:  
The Comms and Data (Figure 6) tab sheet provides  
access to the Standby bit. The comms registers RS2,  
RS1, RS0, and R/W bits are automatically set by each  
register’s read and write buttons. The channel select  
bits CH1 and CH0 are determined by which channel is  
selected on the Measurement tab sheet.  
• In step 1, leave JU1 and JU2 open.  
• In step 3, apply a +3VDC power supply (instead of  
+5V) to TB1. Apply an external +1.225VDC differen-  
tial reference between TB3 pins 3 and 2.  
• After step 10, go to the software’s Measurement tab  
sheet and type the new reference voltage of 1.225  
next to REF voltage.  
Sampling  
To collect data, go to the Measurement tab sheet and  
click Sample. Select the sample size and click Begin  
Sampling. After the samples have been collected, the  
data is automatically uploaded to the host and is  
graphed. Once displayed, the data can be saved to a  
file (optional).  
Evaluating the MX7705  
To evaluate the MX7705, request a free sample of the  
MX7705EUE and replace U1. The MX7705 is similar to  
the MAX1415/1416 except it does not support internal  
clock mode (INT must always be zero).  
Saving Graphs to Disk  
Data in the real-time graph and in the sampled data  
graphs can be saved to a file (Figures 7–8). Only the  
raw output codes are saved, but voltages can be  
inferred based on the reference voltage and the maxi-  
mum code value.  
Using an External Reference  
To use an external reference, remove the shunts from  
JU1 and JU2, and connect a differential reference  
between TB3 pins 3 and 2. The evaluation software  
assumes a 2.500V reference voltage, unless otherwise  
specified. To override this value, go to the Measurement  
tab sheet and type the new reference voltage next to  
REF voltage.  
Evaluating Power-Down Mode  
To enter standby mode, first make sure that Auto Read  
is not checked in the Measurement tab sheet. Then go  
to the Comms and Data tab sheet and check power-  
down, then click write.  
Troubleshooting  
Problem: No output measurement. System seems to  
report zero voltage, or fails to make a measurement.  
Reference Voltage  
The evaluation software assumes a 2.500V reference  
voltage, unless otherwise specified. To override this  
value, go to the Measurement tab sheet and type the  
new reference voltage next to REF voltage.  
Check VDD supply voltage at TB1. The EV kit requires  
a separate supply in addition to the supply on the  
microcontroller module. Check the reference voltage  
using a digital voltmeter. Use an oscilloscope to verify  
that the CS, SCLK, and DIN waveforms are correct. If  
the DRDY signal is pulsing, then the software has suc-  
cessfully initialized the MAX1416 and conversions have  
been triggered.  
Software Listing  
The EV kit software disk contains the driver source and  
header file. Refer to DRV1416.cpp and DRV1416.h.  
Problem: Cannot see MCLK waveform on oscillo-  
scope.  
Detailed Description  
of Hardware  
When using an external crystal, the MCLKIN and  
MCLKOUT nodes are very sensitive to extra load  
capacitance. Connecting a typical 10x scope probe  
effectively doubles the load capacitance from 20pF to  
40pF, which can slow down or even halt oscillation.  
When using the internal oscillator (clock register INT =  
1 and CLKDIS = 0), the oscillator signal is visible on the  
MCLKOUT pin. In this mode, MCLKOUT can be mea-  
sured using a typical 10x scope probe.  
The MAX1416 (U1) is a multichannel, 16-bit, sigma-  
delta data-acquisition system. Resistors R1–R4 and  
C1–C4 act as anti-aliasing filters. The MAX873 (U2) is a  
2.5V reference. C14 ensures the MAX873’s stability for  
arbitrary values of input capacitor C11. Level transla-  
tors U3 and U4 allow the kit to support the 3V  
MAX1415, as well as the 5V MAX1416. The input signal  
can be applied directly to terminal blocks TB2 and TB3.  
C5 and C6 bypass the analog-to-digital converter’s  
power supply. See Figure 9, and refer to the MAX1416  
data sheet.  
_______________________________________________________________________________________  
3
MAX1416 Evaluation Kit/  
Evaluation System  
Problem: Internal oscillator does not work.  
Table 1. Jumper Functions  
The internal-oscillator mode is a feature of the  
MAX1416/MAX1415 only, and is not supported on the  
MX7705. The MX7705 requires an external clock, and  
can only be used with INT = 0. To observe the internal  
oscillator driving the MCLKOUT pin, U1 must be a  
MAX1416 or MAX1415, and the clock register must  
have INT = 1 and CLKDIS = 0.  
SHUNT  
POSITION  
JUMPER  
FUNCTION  
U2 (MAX873) supplies REF+  
reference voltage  
Closed*  
JU1  
Open  
Closed*  
Open  
1-2*  
REF+ must be externally connected  
REF- connects to ground at U2  
REF- must be externally connected  
MCLKIN connects to crystal Y1  
MCLKIN is not connected  
JU2  
Problem: Measurements are erratic or unstable or  
there is poor accuracy.  
Check the reference voltage using a digital voltmeter.  
Use an oscilloscope to check for noise. When probing  
for noise, keep the oscilloscope ground-return lead as  
short as possible, preferably less than 1/2 in (10mm).  
Open  
JU3  
MCLKIN connects to ground  
(MAX1416/MAX1415 internal-  
oscillator mode only)  
2-3  
Problem: Unacceptable errors when measuring a  
transducer.  
Closed*  
Open  
MCLKOUT drives crystal Y1  
Although most signal sources can be connected direct-  
ly to the MAX1416’s analog input, some high-imped-  
ance signal sources may require using the internal  
input buffer (BUF = 1).  
MCLKOUT is not connected  
(MAX1416/MAX1415 internal-  
oscillator mode only)  
JU4  
*Default configuration  
Problem: PDA hot-sync software or other device soft-  
ware interferes with EV kit software.  
COM ports can only be used by one device at a time.  
Disable PDA hot-sync manager.  
QSPI is a trademark of Motorola, Inc.  
4
_______________________________________________________________________________________  
MAX1416 Evaluation Kit/  
Evaluation System  
Figure 1. MAX1416—Main Window of the Evaluation Software—Measurement Tab Sheet  
_______________________________________________________________________________________  
5
MAX1416 Evaluation Kit/  
Evaluation System  
Figure 2. MAX1416—Main Window of the Evaluation Software—Setup Tab Sheet  
6
_______________________________________________________________________________________  
MAX1416 Evaluation Kit/  
Evaluation System  
Figure 3. MAX1416—Main Window of the Evaluation Software—Clock Tab Sheet  
_______________________________________________________________________________________  
7
MAX1416 Evaluation Kit/  
Evaluation System  
Figure 4. MAX1416—Main Window of the Evaluation Software—Offset Tab Sheet  
8
_______________________________________________________________________________________  
MAX1416 Evaluation Kit/  
Evaluation System  
Figure 5. MAX1416—Main Window of the Evaluation Software—Gain Tab Sheet  
_______________________________________________________________________________________  
9
MAX1416 Evaluation Kit/  
Evaluation System  
Figure 6. MAX1416 —Main Window of the Evaluation Software—Comms and Data Tab Sheet  
10 ______________________________________________________________________________________  
MAX1416 Evaluation Kit/  
Evaluation System  
Figure 7. MAX1416—Saving Graphs to Disk  
Figure 8. MAX1416—Saving Graphs to Disk  
______________________________________________________________________________________ 11  
MAX1416 Evaluation Kit/  
Evaluation System  
Figure 9. MAX1416 EV Kit Schematic  
12 ______________________________________________________________________________________  
MAX1416 Evaluation Kit/  
Evaluation System  
Figure 10. MAX1416 EV Kit Component Placement Guide—Component Side  
Figure 11. MAX1416 EV Kit PC Board Layout—Component Side  
______________________________________________________________________________________ 13  
MAX1416 Evaluation Kit/  
Evaluation System  
Figure 12. MAX1416 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.  
14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600  
© 2003 Maxim Integrated Products  
Printed USA  
is a registered trademark of Maxim Integrated Products.  

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