Microchip PIC16HV540 datasheet in PDF, 1.48 MB. The HV designation refers to a high-voltage variant of the baseline PIC family designed to run from a wider supply range with an internal regulator, as described in the document itself. Expect pinout, voltage regulator details, brown-out behaviour, register maps and electrical limits. Use it when servicing battery-powered or automotive-style circuits to check the allowed input voltage, identify the supply pins and confirm whether the chip is being driven within specification.
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