Melexis MLX71122 Programming Manual

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Programming Software Manual

MLX71122 RF Receiver

Programming Software Manual

Software Version v3.2

SW71122

MLX71122 RF Receiver

Software Revision History

Software Version Date Changes Doc. Rev.

v2.0 28.08.2006 Initial Version for MLX71122A 001

v2.1 03.01.2007 Adaptation of software to 2nd version of MLX71122A 002

v3.1 10.04.2008 Adaptation of software to 2nd version of MLX71122B 003

v3.2 26.08.2011 Description for USB-SPI converter added 004

39011 71122 01 Page 1 of 21 SW71122-Manual
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SW71122

MLX71122 RF Receiver

Programming Software Manual

Content

1 General Description ...................................................................................................4

2 Hardware and Software Requirements ....................................................................5

3 Installation and Files..................................................................................................5

4 Using the Software.....................................................................................................6

4.1 Software Start Up .............................................................................................................. 6

4.2 Menus................................................................................................................................ 7

4.2.1 File.............................................................................................................................................7

4.2.2 LPT ............................................................................................................................................7

4.2.3 Settings......................................................................................................................................7

4.2.4 About .........................................................................................................................................8

4.3 Send to IC - Button ............................................................................................................ 9

4.4 Tuning Info - Frame ........................................................................................................... 9

4.5 Program Status Line.......................................................................................................... 9

4.6 IC Status - Frame ............................................................................................................ 10

4.7 Frequency Pre-Selection - Frame.................................................................................... 10

5 Description of the Control Tabs..............................................................................11

5.1 Mode Control – Tab......................................................................................................... 11

5.1.1 Operation Mode.......................................................................................................................11

5.1.2 Multi Functional Output Mode..................................................................................................12

5.1.3 Function of LDRSSIL bit ..........................................................................................................12

5.1.4 Bit Slicer Mode ........................................................................................................................12

5.1.5 DTAO Polarity..........................................................................................................................12

5.1.6 Demodulation Type .................................................................................................................12

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5.2 Gain Control – Tab .......................................................................................................... 13

5.2.1 LNA..........................................................................................................................................13

5.2.2 IF Filter ....................................................................................................................................13

5.2.3 1st Mixer Gain ..........................................................................................................................13

5.2.4 2nd Mixer Gain..........................................................................................................................14

5.2.5 Demodulator Gain ...................................................................................................................14

5.2.6 RSSI Gain................................................................................................................................14

5.2.7 Enable AGC.............................................................................................................................14

5.2.8 Delay Settings .........................................................................................................................14

5.2.9 Delay Mode .............................................................................................................................14

5.3 PLL Control – Tab ........................................................................................................... 15

5.3.1 LDTIME ...................................................................................................................................15

5.3.2 LDERR ....................................................................................................................................15

5.3.3 CPCUR....................................................................................................................................15

5.3.4 ROCUR ...................................................................................................................................16

5.3.5 PRESCUR ...............................................................................................................................16

5.3.6 PFDPOL ..................................................................................................................................16

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SW71122

MLX71122 RF Receiver

Programming Software Manual

5.3.7 VCO Range .............................................................................................................................16

5.3.8 VCO Buffer Current .................................................................................................................16

5.3.9 VCO Core Current ...................................................................................................................16

5.4 Frequency and IFF Control – Tab.................................................................................... 17

5.4.1 Auto Adjustment ......................................................................................................................17

5.4.2 Halt ..........................................................................................................................................17

5.4.3 RIFF Divider ............................................................................................................................17

5.4.4 IFF Preset Value......................................................................................................................18

5.4.5 IFF centre freq. ........................................................................................................................18

5.4.6 f

5.4.7 R Divider..................................................................................................................................18

5.4.8 fRF............................................................................................................................................18

5.4.9 A ..............................................................................................................................................18

5.4.10 N ..............................................................................................................................................18

5.4.11 N

5.4.12 Calculate Button ......................................................................................................................18

5.4.13 LO1..........................................................................................................................................19

5.4.14 LO2..........................................................................................................................................19

5.4.15 LO2DIV....................................................................................................................................19

5.5 Register Set - Tab ........................................................................................................... 19

..........................................................................................................................................18

XTAL

.........................................................................................................................................18

TOT

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39011 71122 01 Page 3 of 21 SW71122-Manual
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SW71122

FSK

DEMOD

Control

BIAS

V

E

E

A

N

A

V

C

C

D

I

G

V

E

E

D

I

G

OA2

DFO

OA1

PKDET+

PKDET

SLC

PDP

PDN

DTAO

D

F

2

D

F

1

27

26

25

32

22

A

/

S

C

L

K

B

/

S

D

T

A

C

/

S

D

E

N

18

19710

200k

200k

SW2

SW1

2

0

0

k

1

M

1

M

ASK

FSK

L

N

A

O

E

L

N

A

V

C

C

A

N

A

V

E

E

I

F

M

I

X

N

M

I

X

P

R

S

S

I

IFA

IF2

MLX71122 RF Receiver

Programming Software Manual

1 General Description

The PC programming software can be used to control the operational modes of the MLX71122 RF receiver at
its Serial Programming Interface (SPI) through the three pins A/SCLK, B/SDTA and C/SDEN. The pin
SPISEL must be at logic HIGH in order to set the MLX71122 to SPI mode. Otherwise the receiver operates in
stand-alone (or ABC) mode and cannot be programmed via the three pins A/SCLK, B/SDTA and C/SDEN.

In SPI mode, it is possible to write in and read out the seven control registers R0 to R6. Register R7 is a
read-only register for status information. In ABC mode, 8 predefined frequency channels between 369.5 MHz
and 395.9 MHz can be selected by parallel programming at the three pins A/SCLK, B/SDTA and C/SDEN.

A block diagram of the receiver is shown below.

2

1

VE

5

6

43

8

9

28

MODSEL

29

LO2

RO

R

counter

24

IFF

_

SLCSEL

Logic

30

ROI

17

SPISEL

2016 21

ENRX

RBIAS

LNAI

31

MIX1 MIX2

N / A

counter

LF

15

LO1

LF

IF1

PFD

CP

MFO

23

LNA

LO2DIV

VCO

TNK1 TNK2

VCCVCO

VEEVCO

1411

12 13

The following tables show the functionality of the three digital control pins that are used for general operating
mode selection.

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Pin Value Function

SPISEL

0 ABC mode - stand-alone mode, 8 pre-defined frequencies

1 SPI mode - programmable mode, full control via SPI

Pin Value SPISEL Function

0

MODSEL

1

0

ENRX

1

0 FSK receive mode

1 no effect

0 ASK receive mode

1 no effect

0 Receiver in shutdown mode

1 Receiver in last programmed operational mode

0 Receiver in receive mode

1 Receiver in receive mode

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MLX71122 RF Receiver

Programming Software Manual

2 Hardware and Software Requirements

The MLX71122 program has been developed for Windows XP and has been tested for later Windows ver­sions. The program uses TVicPort I/O driver to interface to the parallel port.

The EVB71122 can be used either with a USB-SPI converter connected to the PC’s USB port or it can be
directly connected to the PC’s printer port (LPT). If the LPT port is used then port addresses 0x278, 0x378
and 0x3BC (hexadecimal) are supported. A programming cable with a male 25-pole SUB-D connector can be
purchased together with the evaluation board EVB71122.

The following LPT ports can be connected to the corresponding IC pins:

LPT port Direction IC pin Cable pin

BUSY (pin11) ←

GND (pin18-25)

D1 (pin3)

D2 (pin4) →

D0 (pin2) →

If the PC’s USB port is used, a USB-SPI converter is required. It is available on request or can be purchased
together with the evaluation board EVB71122.

Note that pin 7 of the MLX71122 (SPISEL) is connected to logic HIGH on the EVB71122. This is to set the
receiver to SPI mode.



→

MFO (pin 23) Connected (1)

GND

A/SCLK (pin 19) Connected (3)

B/SDTA (pin 18) Connected (4)

C/SDEN (pin17) Connected (5)

Connected (2)

3 Installation and Files

The installation program will ask you for a folder where you want to install the files. By default, the program
installs the software in the directory:
C:\Program Files\Melexis\MLX71122_V32
The following files will be installed:

File Function

MLX71122_V32.exe Main program executable

unins000.exe Program to uninstall the software

unins000.dat Uninstall data file

MLX71122.ini Init file for windows start of main program

TVicPort.dll Dynamic library to support parallel port programming

ReadMe.txt ReadMe file

mpusbapi.dll Dynamic library to support USB interface

\MLX_SPIUSB_Driver\mchpusb.cat USB driver

\MLX_SPIUSB_Driver\MLX-SPIUSB.inf USB driver

\MLX_SPIUSB_Driver\mchpusb.sys USB driver

\MLX_SPIUSB_Driver\mchpusb64.sys USB driver

Copyrights:
TVicPort I/O driver, © En Tech Taiwan
Windows XP, © Microsoft Corporation.

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SW71122

MLX71122 RF Receiver

Programming Software Manual

We recommend creating the icon of the main program on your PC’s desktop to easily access the program.
The working directory folder of the link should be set to the installation folder.

4 Using the Software

4.1 Software Start Up

Please make sure the evaluation board EVB71122 and the USB-SPI converter (or the LPT cable) are con­nected to the PC. This ensures that the software automatically detects whether the USB or the LPT port are
used.

The software can be started by double clicking on the main program icon in the installation directory or by
double clicking on the link. During start-up the software reads out the corresponding init-file and restores all
settings that were active when the software was regularly closed the last time.

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A typical first menu view of the program is shown in the figure above. The program starts up with the tab
Mode Control activated.

Data is only sent to the IC if the Send to IC button is pressed or Send always is activated.

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SW71122

MLX71122 RF Receiver

Programming Software Manual

4.2 Menus

4.2.1 File

The menu File contains three menu items:

• Load Config load a previously defined config-file and activate the new state

• Save Config save the actual state in a new config-file

The Exit field in the window frame has the same function as the Exit menu item. After a configuration is
loaded its file name is displayed in the window title as reminder.

4.2.2 LPT

This menu enables the user to choose a LPT port address to use for the programming. Three port addresses
are supported (in hexadecimal):

The port address is displayed in the Program Status Line at the lower-right corner of the program window.

Note that if the USB-SPI converter is used the LPT menu cannot be selected (LPT appears gray shaded).
The Program Status Line shows that the USB-SPI converter has been found.

4.2.3 Settings

The menu Settings contains three menu items:

The Defaults menu item of this menu restores the state that is hard-coded on the MLX71122 and that is ac­tive after powering up the IC. The default receive frequency is 384MHz. After recovering the default settings
the text Default Settings is displayed in the window title as reminder.

The Set Vpwm menu item activates the internal reference voltage of the USB-SPI converter. It is freely pro­grammable in a range of 0 to 5V. The voltage should be entered in millivolts.

If ext. Vref menu item is selected, the Set Vpwm menu item cannot be selected (appears gray shaded).

If the LPT port is used the ext. Vref and Set Vpwm menu items cannot be selected (appear gray shaded).

If the ext. Vref menu item is selected, but no external reference voltage is connected to the USB-SPI con­verter the SPI logical high level will be set internally to about 1.83V.

• Exit close the program and save the state into the init-file

• 0x278

• 0x378 (default)

• 0x3BC

• Defaults restores the state that is hard-coded on the MLX71122

• ext. Vref SPI logical high level set by external reference voltage (e.g. provided by supply

voltage of EVB71122)

• Set Vpwm SPI logical high level set by internal reference voltage

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39011 71122 01 Page 7 of 21 SW71122-Manual
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