19-2344; Rev 3; 2/07
MAX6952 Evaluation Kit
The MAX6952 evaluation kit (EV kit) is an assembled and
tested printed circuit board (PCB) that demonstrates the
MAX6952 SPI™-interfaced four-digit 5 x 7 matrix LED
display driver. Two cascaded MAX6952s are used to
drive eight 5 x 7 monocolor matrix displays. The EV kit is
powered by a user-supplied 2.7VDC to 5.5VDC power
supply. The SPI-compatible serial interface is connected
to an IBM- compatible PC parallel port for easy evaluation. The EV kit can be reconfigured for interfacing to a
user’s microcontroller for standalone operation.
Windows® 95/98/2000-compatible software provides a
user-friendly interface to demonstrate the features of
the MAX6952 IC. The program is menu driven and
offers a graphic interface with control buttons.
Features
♦ 8-Character Red 5 x 7 Matrix Cathode-Row
Display
♦ SPI-Compatible Serial Interface
♦ Operates from a 2.7V to 5.5V Supply Range
♦ Reconfigurable for Standalone Operation with an
External Microcontroller
♦ Easy-to-Use Menu-Driven Software
♦ Windows 95/98/2000-Compatible Software
♦ Fully Assembled and Tested
Ordering Information
PART
TEMP RANGE
MAX6952EVKIT+
0°C to +70°C
IC PACKAGE
36 SSOP
+Denotes a lead-free and RoHS-compliant EV kit.
Component List
DESIGNATION
QTY
DESCRIPTION
3
47µF, 10V low-ESR POSCAPs (C)
Sanyo 10TPB47MC
1
1µF ±20%, 10V X7R ceramic
capacitor (0805)
Taiyo Yuden LMK212BJ105MG
C3–C6, C8,
C10
6
0.1µF ±10%, 16V X7R ceramic
capacitors (0603)
Murata GRM39X7R104K016AD
D1–D8
8
C1, C7, C9
C2
D9, D10
D11
2
1
Red 0.7in 5 x 7 LED dot-matrix,
cathode-row displays
200mA, 25V Schottky diodes
(SOT23)
Diodes Inc. BAT54C-7-F or
Zetex BAT54C
200mA, 75V ultra-fast diode
(SOD-123)
Fairchild MMSD4148
J1
1
DB-25 male right-angle connector
J2
1
6-pin header
DESIGNATION
QTY
JU9
1
3-pin header
6
10kΩ ±5% resistors (0805)
R1–R4, R9, R10
DESCRIPTION
R5, R6
2
61.9kΩ ±1% resistors (0805)
R7
1
1MΩ ±5% resistor (0805)
680Ω ±5% resistor (0805)
R8
1
EXT_CLK
1
BNC connector
U1, U2
2
MAX6952EAX+ (36-pin SSOPs)
U3
1
MAX1841EUB+ (10-pin µMAX)
U4, U6
2
MAX3370EXK+ (5-pin SC70s)
U5
1
Unbuffered hex inverter (14-pin SO)
TI SN74HCU04D E4
Y1
1
4MHz ceramic resonator with
capacitors
Murata CSTCR4M00G53-R0
—
1
Shunt (JU9)
—
1
PCB: MAX6952 evaluation kit+
Windows is a registered trademark of Microsoft Corp.
SPI is a trademark of Motorola, Inc.
________________________________________________________________ Maxim Integrated Products
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.
1
Evaluates: MAX6952
General Description
Evaluates: MAX6952
MAX6952 Evaluation Kit
Component Suppliers
SUPPLIER
PHONE
WEBSITE
Diodes Inc.
805-446-4800
www.diodes.com
Fairchild Semiconductor
888-522-5372
www.fairchildsemi.com
Murata Mfg. Co., Ltd.
770-436-1300
www.murata.com
SANYO North America Corp.
619-661-6835
www.sanyovideo.com
Taiyo Yuden
800-348-2496
www.t-yuden.com
TDK Corp.
847-803-6100
www.component.tdk.com
Zetex USA
631-543-7100
www.zetex.com
Note: Indicate that you are using the MAX6952 when contacting these component suppliers.
Quick Start
Required Equipment
Before beginning, the following equipment is needed:
• Compatible PC running Windows 95/98/2000
• Parallel printer port LPT1, LPT2, or LPT3 (25-pin female socket)
• Standard 25-pin, straight-through, male-to-female
cable (6ft maximum printer extension cable) to connect
the computer’s parallel port to the MAX6952 EV kit
• DC power supply capable of supplying between
2.7V and 5.5V and at least 500mA of current
Procedure
The MAX6952 EV kit is fully assembled and tested.
Caution: Do not turn on the power until all connections are made.
1) Connect the computer’s parallel port to the MAX6952
EV kit. Use a straight-through 25-pin female-to-male
cable. The EV kit software uses a loopback connection to confirm that the correct port has been selected.
2) Use the INSTALL.EXE program to install the files and
create icons for them in the Windows 95/98/2000
Start menu. For Windows 2000, check to confirm that
you have the required administrator privilege.
3) Turn on the power supply and set it to 5V and turn it off.
4) Connect the power-supply positive terminal to the
V CC pad and negative terminal to the GND pad.
Turn on the power supply.
5) Start the MAX6952 program by opening its icon in
the Start menu.
6) Observe as the program automatically detects the
parallel port address of the MAX6952 EV kit and
starts the main program.
(5V signals), and loopback signals. The CS, DIN,
CLK, DOUT, and BLINK pads on the EV kit’s left side
are VCC level-shifted signals from the MAX1841 and
MAX3370 level translators, respectively. Both signal
locations can be used for monitoring.
Note: An uninstall program is included with the software. Click on the UNINSTALL icon to remove the EV
kit software from the hard drive.
Detailed Description of Software
Note: Words in boldface are user-selectable features in
the software.
Software Startup
A mouse or the Tab key is used to navigate between
items on the Main display window. Upon starting the
program, the MAX6952 EV kit display is programmed to
initialize in Normal mode, display eight digits, blink at
the Slow Rate with an 8/16 (50% duty cycle) display
intensity, and display the contents of the initialized
MAX6952 SRAM Plane P0 and P1 contents. The User
RAM characters are blank. The MAX6952 EV kit eightdigit 5 x 7 matrix LED display should alternate between
MAX6952 and ->EV KIT. The number of digits displayed is fixed at eight digits, four digits per MAX6952.
Main Window Display Controls
The Display Mode radio buttons determine the mode of
operation of the MAX6952 EV kit. Clicking on the
Shutdown radio button puts the MAX6952 drivers into
shutdown mode. The display is blank and the EV kit
draws the least amount of current in this mode.
Selecting the Normal radio button places the MAX6952
EV kit in the normal mode of operation. The Test radio
button puts the MAX6952 EV kit in test mode. All eight
digits of the 5 x 7 LED matrix display on the MAX6952
EV kit are illuminated with a 50% duty cycle (8/16).
7) Header J2 is provided to monitor the parallel port
pins supplying the CLK_P, CS_P, DIN_P, DOUT_P
2
_______________________________________________________________________________________
MAX6952 Evaluation Kit
Figure 2. MAX6952 Evaluation Software User RAM Window Determines the Shape of the 24 User-Definable Characters
To change the blink rate, click on one of the Blink Rate
radio buttons. Once selected, the Blink Rate can be
adjusted by using the up-down arrows on the keyboard. The red ON caption on the left side of each
plane indicates which plane is currently displayed on
the EV kit hardware. Intensity of the MAX6952 EV kit
LEDs can be adjusted by using the mouse to move the
Intensity Control track bar. Once selected, the
Intensity Control can be adjusted with the left-right
arrows on the keyboard.
_______________________________________________________________________________________
3
Evaluates: MAX6952
Figure 1. MAX6952 Evaluation Software’s Main Window Controls the Display, Intensity, Blink Rate, and Character Code of Each 5 x 7
LED Matrix Digit
Evaluates: MAX6952
MAX6952 Evaluation Kit
Both SRAM Data Planes P0 and P1 are displayed on
the computer monitor eight-digit 5 x 7 LED matrix and
are updated when a new hexadecimal digit value is
entered above the digit in the edit box. The program
keeps track of data written to all registers in the
MAX6952 hardware. To clear the MAX6952 P0 and P1
Plane registers, click on the Clear Planes button and
both planes are set to the blank ASCII character, hexadecimal value 20. Note that the EV kit is still in Normal
display mode although all of the 5 x 7 LED matrix segments are off.
Figure 1 shows the evaluation software’s Main window.
Pulldown Menus and Saving Data
All available functions, except for altering a digit’s
value, can be changed using the Pulldown menus. A
reset function is also provided in the View|Reset menu
to reinitialize the program and hardware.*
Pressing the Save Data button saves all the current
registers, P0 and P1 planes, and user-definable character data to the MAX6952.ini file. The Restore Data
button retrieves the saved registers, P0 and P1 planes,
user-definable characters data, and sends them to the
MAX6952 EV kit hardware. The Main window and User
RAM window are also restored to the saved condition.
User RAM Interface
Clicking on the User RAM button brings up the User
RAM display window (Figure 2), allowing the user to
configure all 24 user-definable characters RAM00–
RAM23. Clicking on the desired digit’s dot illuminates
the segment and automatically updates both
MAX6952’s user RAM in the EV kit with the new pattern
for that particular character. Entering the hexadecimal
value of a user-defined character in the Main window’s
plane P0 or P1 edit box displays the user-defined character. For example, entering 00 displays the character
designed at RAM00 in the user RAM window. The EV
kit’s appropriate digit is also updated with the character.
To clear all 24 user-definable characters RAM00–
RAM23, use the Clear All User RAM button. User RAM
in both MAX6952s on the EV kit is cleared. Clicking the
Exit User RAM button closes the User RAM display
window.
General-Purpose SPI Utility
There are two methods for communicating with the
MAX6952: through the Main window display or through
the general-purpose SPI utility using the View|SPI
Utility command. The utility configures the SPI parameters such as clock polarity (CPOL), clock phase
(CPHA), and chip select (CS) polarity. The fields where
pin numbers are required apply to the pins of the parallel port connector. When using the SPI utility, the Main
window display no longer keeps track of changes sent
to hardware. The SPI utility is preconfigured for the
proper setting of CPOL, CPHA, and CS. The EV kit and
PC program can be reinitialized to the startup screen
settings by using the View|Reset EV kit command.
The utility handles data as 8-bit hexadecimal bytes.
Data longer than 1 byte must be handled as multiple
bytes. Thus, for the MAX6952 EV kit, 16-bit words are
broken into two 8-bit bytes:
1) Click on the Bit-Banging Serial Interface tab and
set bits per byte to 8 (Figure 3).
2) Enter the command byte first and then the data byte.
Figure 3. Parallel Port Diagnostic Window’s Bit-Banging
Serial Interface Tab Provides Direct, Low-Level Access to
the MAX6952 Through the SPI Interface
3) To write data to the MAX6952 EV kit hardware, enter
the data into the Data bytes to be written field. The
data bytes must be hexadecimal and prefixed by 0x.
4) Separate each byte with a comma.
*Active and inactive dot colors can be changed using the
View|Reset Matrix color menu.
4
_______________________________________________________________________________________
MAX6952 Evaluation Kit
MAX6952 EV KIT
VCC
PC
PARALLEL
PORT
5V
MAX6952
MAX6952
MAX3370
MAX1841
EIGHT 5 × 7 MATRIX DIGITS
VCC VOLTAGE SIDE
5) Press the Send Now button to write the data to the
MAX6952 EV kit. For example, to set the MAX6952
EV kit’s display intensity to 2/16 for digits 1, 2, 5, and
6, enter the command word 0x01 and data word
0x11 as: 0x01,0x11, 0x01,0x11 and click the Send
Now button. Multiple commands and data sets must
be sent to the EV kit since two MAX6952 ICs are
serially cascaded. Setting the repeat to 2 automatically accomplishes this. Data received from the
MAX6952 ICs is displayed under the Data Bytes
received.
Detailed Description
of Hardware
5V SIDE
Figure 4. MAX6952 EV Kit Level-Translation Block Diagram
The MAX6952 EV kit demonstrates two MAX6952 fourdigit 5 x 7 LED matrix display drivers cascaded together driving eight red LED 5 x 7 matrix displays. The red
Table 1. Standalone Mode
JUMPER
JUMPER,
PCB TRACE
JU1
Cut open
U6 level-translator BLINK signal
isolated from EV kit
Standalone, external controller connected to
BLINK pad
JU2
Cut open
U3 level-translator CLK signal isolated
from EV kit
Standalone, external controller connected to CLK
pad
JU3
Cut open
U3 level-translator CS signal isolated
from EV kit
Standalone, external controller connected to CS
pad
JU4
Cut open
U3 level-translator DIN signal isolated
from EV kit
Standalone, external controller connected to DIN
pad
JU5
Cut open
U3 level-translator VCC pin isolated
U3 power disconnected
JU6
Cut open
U4 level-translator DOUT signal
isolated from EV kit
Standalone, external controller connected to
DOUT pad
JU7
Cut open
U4 level-translator VCC pin isolated
U4 power disconnected
JU8
Cut open
U6 level-translator VCC pin isolated
U6 power disconnected
JUMPER FUNCTION
EV KIT MODE
Table 2. PC/Software Control Mode
JUMPER
JUMPER,
PCB TRACE
JU1
Shorted
U6 level translator provides BLINK signal
JU2
Shorted
U3 level translator provides CLK signal
PC/software control through parallel port
JU3
Shorted
U3 level translator provides CS signal
PC/software control through parallel port
JU4
Shorted
U3 level translator provides DIN signal
PC/software control through parallel port
JU5
Shorted
U3 level translator powered from VCC rail
U3 power connected
JU6
Shorted
U4 level translator provides DOUT signal
PC/software control through parallel port
JU7
Shorted
U4 level translator powered from VCC rail
U4 power connected
JU8
Shorted
U6 level translator powered from VCC rail
U6 power connected
JUMPER FUNCTION
EV KIT MODE
PC/software control through parallel port
_______________________________________________________________________________________
5
Evaluates: MAX6952
2.7V TO 5.5V POWER SUPPLY
Evaluates: MAX6952
MAX6952 Evaluation Kit
5 x 7 LED matrix displays are cathode-row type. The
user must provide the EV kit with a DC power supply
capable of supplying between 2.7V and 5.5V and
capable of providing at least 500mA.
The EV kit connects to a compatible PC parallel port to
control the EV kit. The EV kit’s SPI-compatible serial
interface is connected to a MAX1841 (U3) and two
MAX3370 (U4, U6) level translators. The translators
level shift the computer’s parallel port logic 5V signals
to the EV kit’s logic VCC voltage level chosen by the
user. The translators can function with voltages down to
2.7V. The level translators’ parallel port side is powered
by the parallel port’s D5–D7 data pins, diodes D9/D10,
and capacitor C2, which provides approximately 5V to
the translators’ power input. The power supply connected to VCC provides power to the translators’ outputs. A
6-pin header (J2) is provided for monitoring the 5V
CLK_P, CS_P, DIN_P, DOUT_P non-level-translated
and loopback signals coming from the parallel port
cable.
The EV kit can be reconfigured for standalone operation and connected to an external microcontroller for
evaluation. Pullup resistors R1–R4 and R10 are provided on the EV kit for the MAX6952’s CLK, CS, DIN,
DOUT, and BLINK pins. PCB pads are provided for
interfacing or monitoring the CLK, CS, DIN, DOUT, and
BLINK level-translated pins of the MAX6952 ICs.
The MAX6952 ICs are configured for an external 4MHz
oscillator provided by IC U5, ceramic resonator (Y1),
and resistors R8 and R7. Resistor R7 provides positive
feedback to the inverter’s input (U5-A) and damping
resistor R8 provides attenuated coupling between the
feedback circuit and inverter. Inverters U5-B and U5-C
provide buffering and sharpen the clock signal. The EV
kit can be reconfigured for evaluating other frequencies
by applying an external TTL/CMOS-compatible clock to
BNC connector EXT_CLK and reconfiguring jumper
JU9. The external clock’s frequency range should be
within 1MHz to 8MHz.
Both MAX6952’s (U1, U2) blink signals can be monitored with an oscilloscope at test points TP1 and TP2,
respectively. Each MAX6952’s peak segment current is
set to 30mA by resistors R5 and R6 for U1 and U2,
respectively.
The parallel port signals are level translated and
buffered from the EV kit by the level translators.
However, the two sides are not galvanically isolated.
Figure 4 shows the parallel port and level-translation
interface for the MAX6952 EV kit.
6
Jumper Selection
Standalone Configuration
The MAX6952 EV kit features several jumpers (JU1–
JU8) to reconfigure the EV kit for standalone operation
mode or PC/software control mode. Tables 1 and 2 list
the jumpers to cut open or short for the desired evaluation mode. Note: All jumpers must be configured for
only one mode at a time. A suitable voltage must be
selected for standalone mode. Configure all jumpers for
either standalone or PC/software control mode.
Evaluating Other Oscillator Frequencies
The MAX6952 EV kit features a jumper to select the multiplex clock source. The MAX6952 EV kit is configured to
be driven at 4MHz by an external oscillator formed by
ceramic resonator Y1, resistors R7/R8, and inverter U5.
The user can connect an external TTL/CMOS clock
oscillator to the EXT_CLK pad to evaluate other frequencies (1MHz (min) to 8MHz (max)). The 3-pin jumper JU9
selects the source for the MAX6952 multiplex clock.
Table 3 lists the various jumper options.
Troubleshooting
Problem: Cannot find MAX6952 EV kit parallel port
connection.
Ensure that the I/O extension cable is connected to a
parallel port, and not a SCSI or other type of port. Verify
that the supplied LPTCON.VXD is in the same directory
as MAX6952.EXE. If a local printer driver is installed,
temporarily disable it. The software does not work if the
program icon is dragged onto the windows desktop;
instead, install the software using the install program.
Table 3. Jumper JU9 Functions
SHUNT
LOCATION
OSCILLATOR
SOURCE
OSCILLATOR
FREQUENCY
1 and 2
Inverter U5-C
4MHz, set by EV kit
oscillator
2 and 3
EXT_CLK pad,
D11, and U5-F
provide VCC level
clock
External TTL/CMOS
clock range (1MHz to
8MHz) for the external
oscillator
_______________________________________________________________________________________
MAX6952 Evaluation Kit
R9
10kΩ
EXT_CLK
1
BNC
2
D11
U5-E
11
U5-F
13
3
2
1
U5-A
1
U5-C
U5-B
3
5
4
10
U5-D
JU9
9
8
VCC
R7
1MΩ
DVCC
R8
680Ω
Y1
JU8
5 V
CC
VL 1
3
U6
VCC
MAX3370
GND
2
2
VCC
R10
10kΩ
VCC
4
BLINK_P
C1
47µF
GND
MUX_CLK2
6
7
1
MUX_CLK1
12
C10
0.1µF
14
Evaluates: MAX6952
VCC
I/O_VL
IO_VCC
3
JU1
BLINK
BLINK
Figure 5a. MAX6952 EV Kit Schematic (Sheet 1 of 4)
DVCC
1
J1-6
J1-1
N.C.
J1-11
N.C.
L
D9
3
2 R
J1-7
VCC
J1-14
N.C.
J1-15
N.C.
J1-9
L
D10
3
DVCC
C2
1µF
2 R
JU5
2
VCC 9
DVCC
J1-25
J1-24
DB-25 MALE CONNECTOR
VCC
1
J1-8
3
J2-1
J1-23
CIN
J1-22
CLK_P
J1-21
J2-2
4
J1-20
U3
CLK
VCC
8
CS
CLK
JU2
R2
10kΩ
CLK
MAX1841
RIN
R1
10kΩ
C3
0.1µF
RST
JU3
R3
10kΩ
J1-19
CS_P
J1-18
J2-3
DIN_P
5
DRRV
IO
1 DATA
10
VCC
JU4
GND 6
VCC
J2-6
DVCC
LOOPBACK
J1-5
J2-4
J1-17
N.C.
J1-16
N.C.
J1-12
DOUT_P
J1-10
BLINK_P
J1-4
DIN_P
J1-3
CS_P
CLK_P
6-PIN HEADER
J1-13
J1-2
CS
7
5
C4
0.1µF
JU7
VCC
VL
DIN
1
GND
C5
0.1µF
U4
MAX3370
GND
DIN
VCC
2
DOUT_P
R4
10kΩ
J2-5
4
IO_VCC
I/O_VL
3
JU6
DOUT
DOUT
Figure 5b. MAX6952 EV Kit Schematic (Sheet 2 of 4)
_______________________________________________________________________________________
7
Evaluates: MAX6952
MAX6952 Evaluation Kit
A15
VCC
A3
32
C7
47µF
33
C6
0.1µF
4
5
VCC
01
VCC
02
03
GND
04
GND
05
U1
CLK
19
CLK
MAX6952
DIN
18
DIN
CS
21
20
DOUT1
CS
DOUT
BLINK
17
TP1
BLINK
MUX_CLK1
22 MUX_CLK
15
ISET
R5
61.9kΩ
1%
16
GND
1
2
3
6
7
8
06
9
07
10
08
11
09
12
010
13
011
14
012
23
013
24
014
25
015
26
016
27
017
28
018
29
019
30
020
31
021
34
022
35
023
36
024
A1
A16
A2
A5
A6
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A7
A20
A3
A21
A5
A6
A7
1
2
3
4
C1
R1
R3
R2
C2
D1
C3
R5
R4
R6
C5
R7
C4
C1
2
R3
3
C2
4
R5
5
R6
6
R7
R1
5
6
1
R2
D2
C3
R4
C5
C4
12
11
10
9
8
7
12
11
10
9
8
7
A1
A2
A17
A4
A19
A18
A1
A2
A22
A4
A24
A23
A13
A14
A15
A15
A10
A16
A17
A18
A19
A16
A12
A13
A14
1
2
3
4
5
6
C1
R1
R3
R2
C2
D3
C3
R5
R4
R6
C5
R7
C4
C1
R1
R3
R2
12
11
10
9
8
7
A8
A9
A17
A11
A19
A18
A20
A21
A22
A23
A20
A24
A21
A10
A12
A13
A14
1
2
3
4
5
6
C2
D4
C3
R5
R4
R6
C5
R7
C4
12
11
10
9
8
7
A8
A9
A22
A11
A24
A23
Figure 5c. MAX6952 EV Kit Schematic (Sheet 3 of 4)
B15
VCC
B3
32
C9
47µF
33
C8
0.1µF
4
5
VCC
01
VCC
02
03
GND
04
GND
05
U2
CLK
19
CLK
MAX6952
DOUT1
18
DIN
CS
21
20
DOUT
17
TP2
CS
DOUT
BLINK
MUX_CLK2
22 MUX_CLK
15
ISET
R6
61.9kΩ
1%
020
021
023
GND
3
6
7
8
06
9
07
10
08
11
09
12
010
13
011
14
012
23
013
24
014
25
015
26
016
27
017
28
018
29
019
022
16
1
2
024
30
31
34
35
36
B1
B16
B2
B5
B6
B3
B4
B5
B6
B7
B8
B9
B10
B11
B12
B7
B20
B3
B21
B5
B6
B7
1
2
3
4
C1
R1
R3
R2
C2
D5
C3
R5
R4
R6
C5
R7
C4
C1
2
R3
3
C2
4
R5
5
R6
6
R7
R1
5
6
1
R2
D6
C3
R4
C5
C4
12
11
10
9
8
7
12
11
10
9
8
7
B1
B2
B17
B4
B19
B18
B1
B2
B22
B4
B24
B23
B13
B14
B15
B15
B10
B16
B17
B16
B18
B19
B12
B13
B14
1
2
3
4
5
6
C1
R1
R3
R2
C2
D7
C3
R5
R4
R6
C5
R7
C6
C1
R1
R3
R2
12
11
10
9
8
7
B8
B9
B17
B11
B19
B18
B20
B21
B22
B23
B20
B24
B21
B10
B12
B13
B14
1
2
3
4
5
6
C2
D8
C3
R5
R4
R6
C5
R7
C6
12
11
10
9
8
7
B8
B9
B22
B11
B24
B23
Figure 5d. MAX6952 EV Kit Schematic (Sheet 4 of 4)
8
_______________________________________________________________________________________
MAX6952 Evaluation Kit
Evaluates: MAX6952
Figure 6. MAX6952 EV Kit Component Placement Guide—Component Side
Figure 7. MAX6952 EV Kit PCB Layout—Component Side
_______________________________________________________________________________________
9
Evaluates: MAX6952
MAX6952 Evaluation Kit
Figure 8. MAX6952 EV Kit PCB Layout—Solder Side
Revision History
Pages changed at Rev 3: 1, 2, 5–10
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.
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