Winbond Electronics Corporation America 2727 First Street, Jose, 95134

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Winbond WMS720X Evaluation System User's Guide
Winbond Electronics Corporation America 2727 First Street, Jose, 95134
WMS-E720X Rev: 1.01 Page
TABLE CONTENTS
INTRODUCTION: APPLICATIONS SOFTWARE GLANCE: EASY STEPS ES-WMS720X EVALUATION BOARD:. ES-WMS720X BOARD LAYOUT JUMPER SETTINGS: SWITCH:. DAISY CHAIN OPERATION MODE:. ES-WMS720X SYSTEM SCHEMATICS: WMS720X SOCKET CONNECTION: INTERFACE: ES-WMS720X APPLICATION SOFTWARE: ES-WMS720X SOFTWARE OPERATION: ES-WMS720X SOFTWARE OPERATION EXAMPLES: COMMAND FILE
Winbond Electronics Corporation America 2727 First Street, Jose, 95134
WMS-E720X Rev: 1.01 Page
Introduction:
ES-WMS720 evaluation system easy-to-use PC-based evaluation tool Winbond's WMS720X family. WMS7201/WMS7202/WMS7204 family provides single/dual-/quad-channel, digitally controlled variable resistor (VR) with resolution positions single chip. These devices perform both functions potentiometer variable resistor. ES-WMS720 evaluation system hardware very flexible, provides user generous amount prototype area, variable power supply (2.7v 5.5V) well connectors user's test equipment evaluate performance WMS720X family. output potential resistance) determined wiper position (VW) (Bar graph software), which change from ES-WMS720 hardware board) according Register (TR) settings. settings provided either directly through interface non-volatile memory (NVMEM) where previous settings stored. When changes made register establish wiper position, value setting saved into NVMEM executing NVMEM save operation. Once settings saved NVMEM, them will transferred automatically wiper position system power
Content ES-WMS720X evaluation system Kit:
evaluation system package contains Evaluation Board (batteries included) with following directories: User's Guide Applications Software Data sheets Application Notes
Winbond Electronics Corporation America 2727 First Street, Jose, 95134
WMS-E720X Rev: 1.01 Page
Applications Software Glance:
Figure -Software Overview
Data written NVMEM Output Buffer ON/OFF indicator Changes Register content Register Content
Directly Send Command
Enable Disable Write Protection
Click here send these commands
Available function each channel
Turning knob Selects memory locations displays it's content automatically
Exit program
Winbond Electronics Corporation America 2727 First Street, Jose, 95134
WMS-E720X Rev: 1.01 Page
Easy Steps ES-WMS720X Evaluation Board:
Setup.exe file from ROM. Connect Parallel Port cable evaluation system. Connect (500 above) power supply connect battery turn ON/OFF switch position. Installing application software will have created `Winpot' folder start menu. Start application clicking `Winpot' application Click Wake Command button activate chip (see application software description more details). Connect test equipment such Voltmeter desired channel. Resistor increment decrement resistance. Figure ES-WMS720x Board Layout. Parallel Port Power Supply Jack
Variable Power Supply (2.7V-5.5V) Switches enable disable
User Prototype Area
Test Points Various Channels main socket
Jumpers Test points WMS7201 soldered board
Main Socket
`7201
Winbond Electronics Corporation America 2727 First Street, Jose, 95134
WMS-E720X Rev: 1.01 Page
Jumper Settings:
Enables isolation from connection. Isolates device from (can used measure device's power consumption) Jumper selects correct pin-out WMS7202 devices. Isolates device from (can used measure device's power consumption) used daisy chain operation. (Default Open) J6-J10: Header pins each channel.
Jumper
Enables from WMS720X Socket WMS7202 WMS7201 Device Enables Daisy Chain
Disables from Disables Socket WMS7201, Disables `7201 Disables Daisy Chain
Normal
Required selected device.
Switch:
Switch used disabling SCLK pins daisy chain operation mode. default positions table below.
SW1-1
SW1-2
SW1-3
SW1-4
SW1-5
SW1-6
Daisy Chain Operation mode:
same control multiple devices without need extra lines from microcontroller daisy chaining devices with first device connected next device.
Winbond Electronics Corporation America 2727 First Street, Jose, 95134
WMS-E720X Rev: 1.01 Page
ES-WMS720X System Schematics:
following pages reference only.
Power Supply:
Figure Power Supply Schematics
OFF/ON
EG1903-ND 0.33uF
UA78L05AC/TO3 0.1uF
0.1uF
TL317/TO
470R tant 600R
+9VDC
202A POWER JACK
Cell
Varies 2.8-5.5V +VBat
Winbond Electronics Corporation America 2727 First Street, Jose, 95134
WMS-E720X Rev: 1.01 Page
WMS720X Socket Connection:
Figure Socket Connection Schematics
used isolating devices from introducing ammeter test each device
CSB_HV 0.1uF
required correct WMS7202 pinout required Daisy chain operation
DIP-6
header pins each resistor
V1-U3
V2-U3
WMS7204/2 TRIM
SOCKET
V3-U3
CSB_HV
V4-U4
0.1uF WMS7201 single
SOLDER
Winbond Electronics Corporation America 2727 First Street, Jose, 95134
WMS-E720X Rev: 1.01 Page
Interface:
Figure Parallel port Schematics
CONNECTOR DB25
0.1uF
74LVX244
JUMPER
enables isolation from connection, OPEN: output CLOSED: output input with pull
0.1uF
74HC244
Winbond Electronics Corporation America 2727 First Street, Jose, 95134
WMS-E720X Rev: 1.01 Page
ES-WMS720X Application Software:
application software automatically detects which device socket. following panels appear based WMS720X device using. example using WMS7202, since there only channels available device software will only display active channels. same true single- channel four channel- devices follows. Figure Single Channel Device WMS7201
Figure Channels Active WMS7202
Winbond Electronics Corporation America 2727 First Street, Jose, 95134
WMS-E720X Rev: 1.01 Page
Figure Four Channels Active WMS7204
ES-WMS720x Software Operation:
application software allows READ selected NV-memories, WRITE selected NV-memory, ERASE selected NV-memory chose setting Register configure each channel individually output buffer output buffer operation. software also enables send direct command. Please make sure send Wake Command first before using system. application software features defined following commands that allow users send them without actually typing equivalent these commands. Sleep: Sends sleep command device. Wake Sends Power command device Reset: Sends Reset Command device Sends operation command device Write Protection On/Off: Enables Disables Write Protection Write NVMEM: writes data directly NVMEM (You input 3-digit number 9bit binary data. most significant selects output buffer status. NVMEM needs erased first before writing Load From NVMEM: Loads content memory register selects operation modes that channel. Save NVMEM: Programs content register only memory. Erase NVMEM: Erases four selected memory locations. Select NVMEM: selects NVMEM address displays content
Winbond Electronics Corporation America 2727 First Street, Jose, 95134
WMS-E720X Rev: 1.01 Page
ES-WMS720x Software Operation Examples:
this section will operation two- channel device WMS7202, with examples, however operation software same devices. WMS7202 channels configured independently operate modes Buffer OFF. following graphics illustrate settings. Figure Buffer Mode Example:
Active Channels
change
Input 9-bit data (with selects buffer mode) click Write NVMEM Button
Click Load from NVMEM configures device buffer mode) updates
Example Configure Channel variable resistor save desired value memory location follow these steps
Select memory location
Select Write Protection position
Click Save NVEM save setting Memory. Also saves buffer mode.
Erase NVMemory Location
Send wake command
Winbond Electronics Corporation America 2727 First Street, Jose, 95134
WMS-E720X Rev: 1.01 Page
Figure Three-Terminal Mode Example:
change
Input 9-bit data (with selects buffer mode) click Write NVMEM Button
Click Load from NVMEM configures device buffer mode) updates
Example Configure Channel bufferON save desired value memory location follow these steps
Select Memory Location
Click Save NVEM save setting Memory. Also saves buffer state. Erase Selected memory Location
Select Write Protection position
Send wake command
Winbond Electronics Corporation America 2727 First Street, Jose, 95134
WMS-E720X Rev: 1.01 Page
Command File
command file turned record commands being used application software file. This feature allows users analyze command sequence used when software communicates W7202X device. Figure Command Function
Start/Stop Command logging
Clear File
When Command Logging button `ON' position, file selection menu comes commands send from application written selected file. stop logging, press button `OFF' position.
Winbond Electronics Corporation America 2727 First Street, Jose, 95134
WMS-E720X Rev: 1.01 Page

Winbond Electronics Corporation America 2727 First Street, Jose, 95134

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