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TS-430 Control Board: IC-5 Waveforms

 

TS-430 Control Board: IC-5 Waveforms

Filed in TS-430 on Dec.08, 2018

**Note: All measurements below were using a x10 probe, but I forgot to set the scope to show that.  So rather than the 100mv/division that shows in the photos, I was actually using 1.0v/division.

IC-5 is an 8-Channel Data Selector switch that is used to read the status of various switches or buttons from the front of the rig, as well as the microphone.

The Processor (IC-1) chooses which data input line to read by setting an address on pins 11-13, and setting the Disable pin low. IC-5 then passes the state of the selected input line to the processor on pin 14.

 
TC4512 Pinout

 

TC4512BP_datasheet

IC-5 Pin 1: RXB (Receive) mode

 
IC-5 Pin 1: RXB(Low active)

 

IC-5 Pin 2: HLD (Hold Button Active Low)

 
IC-5 Pin 2: HLD (Not pressed)

 

IC-5 Pin 3: Not used

 
IC-5 Pin 3: Not Used

 

IC-5 Pin 4: AM/FM buttons (Not pressed)

 
IC-5 Pin 4: AM/FM

IC-5 Pin 5: LSB/USB/AM/FM Switches (Not pressed)

 
IC-5 Pin 5: LSB/USB/AM/FM Switches

IC-5 Pin 6: Microphone LSB/CW/AM Switches (Not pressed)

 
IC-5 Pin 6 LSB/CW/AM Switches

IC-5 Pin 7: Microphone UP/DWN Switches (Not Pressed)

 
IC-5 Pin 7: Mic UP/DWN

IC-5 Pin 8: GND

 
IC-5 Pin 8: Ground

 

IC-5 Pin 9: Normally High, but my radio has a mod that uses this line…

 
IC-5 Pin 9: Normally tied high, but not this radio

 

IC-5 Pin 10: GND

 
IC-5 Pin 10: Ground

 

IC-5 Pin 11-13: Data Select Lines A, B C

 
IC-5 Pin 11: Data Select A

 
IC-5 Pin 12: Data Select B

 
IC-5 Pin 13: Data Select C

IC-5 Pin 14: Data Output to processor

 
IC-5 Pin 14: Data Output Z

IC-5 Pin 15: Disable (Like a chip select low)

 
IC-5 Pin 15: Disable

 

IC-5 Pin 16: +5 volt source

 
IC-5 Pin 16: +5 volt source

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