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Why won my existing design startup the UV40 miniature GPS with carrier board?

April 26, 2017design existing GPS miniature startup uv40

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Why won my existing design startup the UV40 miniature GPS with carrier board?

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With the TF10 GPS module it was possible to tie the reset line high or to tie to the main system reset line. The UV40 miniature GPS requires power to be applied for 100mS before a reset pulse is generated. It doesn’t have internal reset circuitry and won’t startup unless this criteria is met.