Difference between revisions of "RadioShack 22-168"
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== Hardware == | == Hardware == | ||
* '''3 1/2 digit ADC with bandgap reference''': [http://www.maxim-ic.com/datasheet/index.mvp/id/1288 Maxim MAX130CPL] ([http://datasheets.maxim-ic.com/en/ds/MAX130-MAX131.pdf 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) | |||
* '''?''': 4.1856MHz crystal (?) | |||
* '''?''': [http://www.intersil.com/content/intersil/en/products/timing-and-digital/counters-time-base-ics/counter-time-base-ics/ICM7555.html Intersil ICM7555CBA] ([http://www.intersil.com/content/dam/Intersil/documents/fn28/fn2867.pdf datasheet]) (marking: "7555 CBA P136FAM") | |||
* '''Quad analog switch/quad multiplexer''': [http://www.onsemi.com/PowerSolutions/product.do?id=MC14066B Motorola 14066B] ([http://www.onsemi.com/pub/Collateral/MC14066B-D.PDF 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 == | == Photos == |
Revision as of 15:11, 26 November 2012
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)
- ?: 4.1856MHz crystal (?)
- ?: Intersil ICM7555CBA (datasheet) (marking: "7555 CBA P136FAM")
- 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