RTC
About the RTC PCB
RTC is an open source PCB design by Fred72z, published on GitHub under the GPL-2.0 license. It is a 2-layer board measuring 76.2 × 49.5 mm, with 15 components from 14 distinct parts.
Other key parts include the ICM7170 and GAL16V8. By type, the board carries 5 capacitors, 3 resistors, 2 ICs, 1 crystal, 1 connector and 1 battery holder.
From the project
Extensions pour ORIC1-ATMOS
Cette platine se branche sur la platine d'extension de bus et permet d'ajouter une horloge RTC à l'ORIC. Elle donne les informations : Heures, Minutes et secondes ainsi que la date. Elle occupe les adresses 360-371.
Les registres de l'horloge sont accessibles à l'aide des commandes PEEK et POKE. Afin d'éviter un décalage lors de la lecture de l'heure, le circuit possède un LATCH qui fige les données lues à la lecture du registre des 1/100e de secondes (adresse 360). Les données contenues dans les autres registres ne changent pas jusqu'à la prochaine lecture de l'adresse 360. Bien entendu…
Main components on the RTC
RTC bill of materials (BOM)
15 components, 14 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ICM7170 | DIP-24_W15.24mm_LongPads | U1 |
| 1 | GAL16V8 | DIP-20_W7.62mm_LongPads | U2 |
| 1 | 32.768kHz | Crystal_AT310_D3.0mm_L10.0mm_Horizontal_1EP_style2 | Y1 |
| 1 | SLOT1 | IDC-Header_2x17_P2.54mm_Horizontal | J1 |
| 1 | CR1220 | BatteryHolder_BC501SM | BT1 |
| 1 | IRQ_RTC | PinHeader_1x02_P2.54mm_Vertical | JP1 |
| 1 | 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D1 |
| 1 | 47µF | CP_Radial_D5.0mm_P2.00mm | C1 |
| 1 | 100nF | C_Rect_L7.0mm_W2.5mm_P5.00mm | C2 |
| 2 | 22pF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C3, C6 |
| 1 | 50pF | Trimmer_Cap_TZ03F | C5 |
| 1 | 2.2k | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R1 |
| 1 | 10K | R_Array_SIP5 | RN1 |
| 1 | 22k | R_Array_SIP9 | RN2 |
RTC design files
The KiCad project lives in the Fred72z/ORIC repository on GitHub; these links point at the commit this page was built from.
RTC: common questions
How big is the RTC PCB?
The RTC measures 76.2 × 49.5 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the RTC?
15 components, from 14 distinct parts. The full bill of materials is listed on this page.
Where can I download the RTC design files?
From the Fred72z/ORIC repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the RTC design in my own project?
Yes, under the terms of its GPL-2.0 license, which Fred72z chose for the repository.
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