Calc
About the Calc PCB
Calc is an open source PIC PCB design by pparent76, published on GitHub. It is a 6-layer board measuring 50 × 50 mm, with 118 components from 38 distinct parts.
Its main chip is the PIC16F722A, from the PIC family. Other key parts include the DDR_SDRAM_MT46_X16, IMX233-BGA, SP6641A and FT230X. By type, the board carries 67 capacitors, 24 resistors, 7 ICs, 7 connectors, 5 diodes and 3 inductors.
From the project
Hardware of the librecalc project
Main components on the Calc
Calc bill of materials (BOM)
118 components, 38 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | DDR_SDRAM_MT46_X16 | TSOP66_JEDEC_DDR_SDRAM | IC1, IC2 |
| 1 | IMX233-BGA | BGA169_0.8mmPitch_11x11mm | IC3 |
| 1 | CONN_MICROSD | Memory_card_microsd_alps | U1 |
| 1 | PIC16F722A | SSOP28 | U2 |
| 1 | SP6641A | SOT23-5_Opendous | U3 |
| 1 | FT230X | QFN16_p0.65mm_MSP430F20xx | U4 |
| 1 | 32.768kHz | xtal32.768 | X1 |
| 1 | 24Mhz | SMDXTAL24mhz | X2 |
| 2 | CONN_4 | CONN_USB_MINI_PIERRE | P1, P2 |
| 1 | CONN_2 | PIN_ARRAY_2X1 | P3 |
| 1 | CONN_18 | FPC22 | P4 |
| 1 | CONN_5 | PIN_ARRAY_5x1 | P5 |
| 1 | CONN_10 | FPC10 | P7 |
| 1 | CONN_20X2 | FPC37 | P8 |
| 1 | JUMPER-2 | SM0805 | JP1 |
| 1 | SWITCH_INV | PIN_ARRAY_3X1 | SW1 |
| 1 | CONN_1 | PIN_ARRAY_1 | reg_5v1 |
| 3 | LED | LED-0805 | D1, D2, D5 |
| 2 | DIODE | SOD123 | D3, D4 |
| 2 | 22uH | INDUCTOR_BOURNS | L1, L2 |
Show 18 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ferite | SM0603 | L3 |
| 9 | 100nF | SM0603_Capa | C1, C2, C3, C4, C11, C12, C13, C14 +1 |
| 4 | 10pf | SM0603_Capa | C5, C6, C7, C8 |
| 1 | NA(100pf) | SM0603_Capa | C9 |
| 1 | 1uf | SM0603_Capa | C10 |
| 18 | 22uF | SM0805 | C16, C17, C20, C21, C22, C24, C25, C39 +10 |
| 26 | 100nf | SM0603 | C18, C19, C23, C26, C27, C28, C29, C30 +18 |
| 6 | 1uF | SM0603 | C33, C35, C47, C56, C57, C66 |
| 2 | 47pF | SM0603 | C62, C63 |
| 4 | 10k | SM0805 | R1, R2, R5, R21 |
| 4 | 1k(1%) | SM0805 | R3, R4, R6, R7 |
| 3 | 100 | SM0805 | R8, R10, R18 |
| 3 | 4.7k | SM0805 | R9, R11, R12 |
| 5 | 47k | SM0805 | R13, R14, R15, R16, R17 |
| 1 | 1K | SM0805 | R19 |
| 1 | 100k | SM0805 | R20 |
| 1 | 0R | SM0603 | R22 |
| 2 | 27R | SM0805 | R25, R26 |
Calc design files
The KiCad project lives in the pparent76/Librecalc-Hardware repository on GitHub; these links point at the commit this page was built from.
Calc: common questions
What microcontroller does the Calc use?
The Calc is built around the PIC16F722A, from the PIC family.
How big is the Calc PCB?
The Calc measures 50 × 50 mm, has 6 copper layers and is 1.6 mm thick.
How many components are on the Calc?
118 components, from 38 distinct parts. The full bill of materials is listed on this page.
Where can I download the Calc design files?
From the pparent76/Librecalc-Hardware repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Calc design in my own project?
The repository has no license, so all rights stay with pparent76. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Calc without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug PIC firmware against it before you order a PCB.
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