Difference between revisions of "RadioShack 22-168"

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File:Rs_22_168_pcb_2_bottom_light.jpg|<small>Secondary PCB, back, illuminated</small>
File:Rs_22_168_pcb_2_bottom_light.jpg|<small>Secondary PCB, back, illuminated</small>
File:Rs_22_168_hidden_components.jpg|<small>Unidentified components protected by black coating</small>
File:Rs_22_168_hidden_components.jpg|<small>Unidentified components protected by black coating</small>
File:Rs_22_168_ics2.jpg|<small></small>
File:Rs_22_168_ics5.jpg|<small>Metex KS57C2016 CPU</small>
File:Rs_22_168_ics3.jpg|<small></small>
File:Rs_22_168_mosc.jpg|<small>4.1856 MHz crystal</small>
File:Rs_22_168_ics4.jpg|<small></small>
File:Rs_22_168_ics3.jpg|<small>MAX130CPL ADC</small>
File:Rs_22_168_ics5.jpg|<small></small>
File:Rs_22_168_ics4.jpg|<small>Metex 9005 7ACS (ST Micro logo)</small>
File:Rs_22_168_ics1.jpg|<small></small>
File:Rs_22_168_ics1.jpg|<small>MC14066B Quad Analog Switch/Quad Multiplexer (left) and unidentified IC (right)</small>
File:Rs_22_168_mosc.jpg|<small></small>
File:Rs_22_168_ics2.jpg|<small>555 Timer</small>
File:Rs_22_168_lcd.jpg|<small>LCD display</small>
File:Rs_22_168_lcd.jpg|<small>LCD display</small>
File:Rs_22_168_lcd_back.jpg|<small>LCD display, back</small>
File:Rs_22_168_lcd_back.jpg|<small>LCD display, back</small>

Revision as of 16:45, 26 November 2012

RadioShack 22-168

The RadioShack 22-168 is a 2000 counts handheld digital multimeter with RS-232 connectivity.

Hardware

  • 3 1/2 digit ADC with bandgap reference: Maxim MAX130CPL (datasheet) (marking: "Maxim MAX130CPL 0138-3 C10039")
  • ?: Metex KS57C2016 (possibly a Samsung KS57C2016 4-bit microcontroller with custom Metex firmware?) (marking: "Metex 95D3 KS57C2016-13 013D 95D3")
  • ?: Metex 9005 (marking has ST logo)
  • Crystal: 4.1856MHz crystal
  • ?: Intersil ICM7555CBA (datasheet) (marking: "H 7555 CBA L405")
  • Quad analog switch/quad multiplexer: Motorola 14066B (datasheet) (marking: "14066B PBV139")
  • Unidentified ICs: Two ICs, which appear to be SSOP8 packages are hidden behind black goo. The purpose of the goo is unknown.

Photos

TODO

Protocol

TODO

Resources