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What are the current and voltage maximum and minimum limits for the push buttons / tactile switches on the TI Launchpad MSP-EXP430G2 ? Also, what is the manufacturer number for this component ? I have not found any datasheet that details this information.

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  • \$\begingroup\$ Look at the eval board BOM \$\endgroup\$
    – Voltage Spike
    Mar 4 at 2:21
  • \$\begingroup\$ thanks for the post. that was the first thing i did using the texas instrument user's guide for this launchpad, with literature number: SLAU318F. the BOM in this document (page 23) does not list the manufacturer numbers of the components in the circuit for some reason, nor does it list the minimum and maximum limits of each component. \$\endgroup\$
    – keikaku
    Mar 4 at 23:11

1 Answer 1

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https://www.ti.com/tool/download/SLAC437 on the TI website contains a link to download the MSP-EXP430G2 Hardware Design Files.

Inside the download there is a MSP-EXP430G2_LaunchPad_BOM.xls spreadsheet containing the Bill Of Materials (BOM) for the launchpad. This has the row with:

Pos. Ref Des Number per board Description DigiKey part #
43 S1, S2 2 Push Button P12225STB-ND 

P12225STB-ND is the DigiKey page the switch part number.

The switch is EVQ-21505R manufactured by Panasonic Electronic Components. The description is:

SWITCH TACTILE SPST-NO 0.02A 15V

The EVQ-21505R is reported as obsolete, and can't seem to find the datasheet on the Panasonic website.

Light Touch Switches/EVQ2 is the datasheet found on the Mouser website and lists following electrical parameters: enter image description here

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  • \$\begingroup\$ thanks for the answer. i reviewed the info you posted. it is pretty close to what i was looking for. that information must be for a different version of the same type of launchpad. it is remarkable how much information there is pertaining to different versions of the same or similar model numbers. following your logic, i found this link: ti.com/tool/msp-exp430g2. it also leads to hardware design files. i found this link from the user's guide with literature number: SLAU318F. it appears to match the specs i was looking for: 50 mA at 12VDC. \$\endgroup\$
    – keikaku
    Mar 3 at 18:28
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    \$\begingroup\$ @keikaku Do you have the MSP-EXP430G2ET launchpad, which is a later version of the MSP-EXP430G2? \$\endgroup\$ Mar 3 at 18:35
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    \$\begingroup\$ @keikaku ti.com/tool/msp-exp430g2 on the TI website now redirects to ti.com/tool/MSP-EXP430G2ET, which is for the later version of the launchpad. web.archive.org/web/20160315014538/http://www.ti.com/tool/… is an old archived version of the TI webpage for the MSP-EXP430G2, which is where I found the link to download the MSP-EXP430G2 Hardware Design Files. \$\endgroup\$ Mar 3 at 18:47
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    \$\begingroup\$ @keikaku Can you edit the question to include a picture of the launchpad and highlight switch you are asking about. \$\endgroup\$ Mar 3 at 18:59
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    \$\begingroup\$ @keikaku The image shows the switches are the EVQ-21505R through-hole mounting parts I listed in the answer, for the MSP-EXP430G2. The 1188E-1K2-V-TR from the comments is surface mount side push type switch, used on the later generation MSP-EXP430G2ET launchpad. \$\endgroup\$ Mar 3 at 19:13

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