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According to the datasheet, the 7 pins are from the 4 rows and 3 columns. What are the other 2 pins connected to ? The image shows 9 pin outs. enter image description here

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1 Answer 1

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They are unconnected. Possibly for use on a different model with more features (more keys, background illumination or similar) which shares components with this one.

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  • \$\begingroup\$ So there is no Vcc and GND here, right? \$\endgroup\$ Jun 21, 2016 at 6:47
  • \$\begingroup\$ @BhavanaBRao Correct. \$\endgroup\$
    – winny
    Jun 21, 2016 at 7:48
  • \$\begingroup\$ The data sheet says- Contact rating : 20mA, 24V dc. What does that mean? \$\endgroup\$ Jun 26, 2016 at 11:23
  • \$\begingroup\$ That the keys (contacts) are not rated for any more than 24 V and 20 mA. This sets the limit for your pull-up voltage and current. Most implementations would be some kind of 3.3 or 5 volt matrix with perhaps 1 mA. \$\endgroup\$
    – winny
    Jun 26, 2016 at 14:30

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