Applicable for MouseWarrior24

Transcription

1 AN: Migrating MWWheel and MWEyeII to the new chips Applicable for MouseWarrior. Introduction This application note is intended for those of you who have existing designs using MouseWarriorWheel or MouseWarriorEyeII. The old versions of these chips had to be replaced as the silicon on which the chips were based has been discontinued. In this application note we will outline the changes between the chip versions and show how to use exisiting designs with the new chips.. What has changed MouseWarriorWheel II and MouseWarriorEyeIII do only support and PS/ interfaces. Serial port and have been removed as their market significance has turned negligible. In place of the old interfaces the chips do now offer inputs for up to six buttons. External circuitry has been cut significantly, removing most of the discrete parts including the resonator which is replaced by an internal oscillator.. How to migrate Existing PCBs can in most cases be used with the new chip by simply changing some of the components and omitting others. For optimal use of the new capabilities a revision of the PCB is recommended. The impact of this change should be minimal as in most cases unused parts have to be removed. In the following we will refer to the application circuit diagrams found on pages to. The old ones had been used in past versions of the MouseWarrior data sheet and we will refer to them to tell you which components to remove or replace etc. The parts of the circuits that change are the same for MouseWarriorWheel and MouseWarriorEye... Resistors For MouseWarriorWheel II all resistors except R and the series resistor for the encoder LEDs are removed. For MouseWarrior Eye III all resistors except R and Rb are removed. If possible connect R to Pin as shown in the new circuit diagrams (.,.), in this case use a K resistor. Should that not be possible just continue to use the K resistor connected to +V... Capacitors C is removed... Diodes No Diodes are used for the new chips. Replace D and D by bridges, remove D... LED drive pin The LED driver pin is significantly stronger in the new chips, it can sink up to 0mA at 0.V. Make sure to check if this is compatible with the LEDs you are using or add an appropriate resistor... Serial and Do not connect the serial and/or interface. These pins are now used as additional button inputs... The resonator The new chips no longer need the ceramic resonator X. Do not put it on the PCB any more and leave the pins and unconnected. If you do supply an external clock remove it if possible. Pin is now used to disable the internal pull up resistors for the axis inputs. So make sure that pin is left unconnected unless you want to disable the pull ups. AN:Migrating MWWheel and MWEyeII to the new chips, May rd 00

2 AN: Migrating MWWheel and MWEyeII to the new chips. Old circuit for MouseWarriorWheel +V PON +V PS/ +V Serial DCD RxD TxD DTR DSR RTS CTS RI D R K R M D D D D D C 0nF ZD V C 00nF X R M MHz R 0Ω R K MWWheel XIN XOut CExt X X Y Y th RTS PSData PSClk/Ser / Buttons Z Z Gnd PullTo T R 00K R K 0 Sw R K Y- Axi s X- Axi s Sw Sw Sw0 Z- Axi s Cl ose for Button scrolling Up Dow n Circuit: Version: Date: MouseWarri orwheel 0. Oct. st Data PS/ Data PS/ Clock AN:Migrating MWWheel and MWEyeII to the new chips, May rd 00

3 AN: Migrating MWWheel and MWEyeII to the new chips. Current circuit for MouseWarriorWheel II +V PS/ +V C 00nF R K MWWheel PullOff VREG X X Y Y th th th PSData PSClk /Buttons Z/Down Z/Up Gnd PullTo 0 Rx Close JP for Close JP to disable internal pull ups on Z/Z Z-Axis Up Down Y-Axis X-Axis JP Sw Sw Sw Sw Sw Sw0 Circuit: MouseWarriorWheel II Version:. Date: May nd 00 0 JP PS/ Data PS/ Clock AN:Migrating MWWheel and MWEyeII to the new chips, May rd 00

4 AN: Migrating MWWheel and MWEyeII to the new chips. Old circuit for MouseWarriorEyeII +V PON +V PS/ +V D D R K R M D C 0nF C 00nF R M X MHz Z- Axi s S Xa Xb Yb Ya Vdd ADNS0 OSCi n XY-LED REFA OSCout REFB R-BIN Rb JP Sw Sw Sw Sw Sw0 Up Dow n Cl ose JP for Rb = See Agi l ent data sheet for val ue X=Tw o pi n cerami c resonator Circuit: MouseWarri or Eye I I Version:.0 Date: Dec th 00 X MHz C 00nF C µ C 00nF C µ LED HLMP ED0 0 XIN MWEYEII S XOut CExt th th PSData PSClk / Buttons Z/ Down Z/ Up Gnd PullTo 0 0 Data PS/ Data PS/ Clock AN:Migrating MWWheel and MWEyeII to the new chips, May rd 00

5 AN: Migrating MWWheel and MWEyeII to the new chips. Current circuit for MouseWarriorEyeIII +V PS/ +V C 00nF R K Z-Axis JP Up Down Close JP for Close JP to disable internal pull ups on Z/Z S Xa Xb Yb Ya Vdd ADNS0 OSCin XY-LED REFA OSCout REFB R-BIN X MHz C 00nF Rb Sw Sw Sw Sw0 Rb = See Agilent data sheet for value Circuit: MouseWarrior Eye III Version:. Date: May nd 00 C µ C 00nF C µ LED HLMP ED0 0 MWEYEIII PullOff VREG S th th th PSData PSClk /Buttons Z/Down Z/Up Gnd PullTo 0 Rx Sw Sw 0 JP PS/ Data PS/ Clock AN:Migrating MWWheel and MWEyeII to the new chips, May rd 00