Date: Sun, 8 Dec 2024 13:12:29 +0900 From: =?UTF-8?B?6aKo5L6G5pWj5Lq6?= <furaisanjin@gmail.com> To: "Daniel O'Connor" <darius@dons.net.au> Cc: FreeBSD ARM List <freebsd-arm@freebsd.org> Subject: Re: DS1307 on rpi4B Message-ID: <CAJzLSnyf0z=TOOaQyCuobfhhHT8F%2Bpx=VbqqEooiP%2Bcs%2BBQ2Qw@mail.gmail.com> In-Reply-To: <BCFF0CD3-574A-4472-B8BB-7EECFCFFE22A@dons.net.au> References: <CAJzLSnxOALkCztZUa-zpUH30g1O0nUfQb4X2=4o_VDv3WTEdaQ@mail.gmail.com> <431FB386-F515-4D77-A855-18055A48E432@dons.net.au> <CAJzLSnw5uuVhc9=HC5sCRv0nBzPXfbq_WVfYrmMg-h99hyRO-A@mail.gmail.com> <BCFF0CD3-574A-4472-B8BB-7EECFCFFE22A@dons.net.au>
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--0000000000001859970628ba775e Content-Type: text/plain; charset="UTF-8" Hello. I'm using this module ( https://www.electronicwings.com/sensors-modules/real-time-clock-rtc-ds1307-module) and there are R2 and R3 for pull-up on the module. The registers are connected to 5V. This probably harms RPI4B because the voltage is 3.3V at RPI4B side. So I removed R2 and R3. That's why internal pull-up is required. Best regards, furaisanjin --0000000000001859970628ba775e Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div dir=3D"ltr"><div>Hello.</div><div><br></div><div>I= 9;m using this module (<a href=3D"https://www.electronicwings.com/sensors-m= odules/real-time-clock-rtc-ds1307-module">https://www.electronicwings.com/s= ensors-modules/real-time-clock-rtc-ds1307-module</a>) and there are R2 and = R3 for pull-up on the module. The registers are connected to 5V. This proba= bly harms RPI4B because the voltage is 3.3V at RPI4B side. So I removed R2 = and R3. That's why internal pull-up is required.</div><div><br></div><d= iv>Best regards,</div><div>furaisanjin</div></div><br><div class=3D"gmail_q= uote gmail_quote_container"></div></div> --0000000000001859970628ba775e--
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