4 layers49.2 × 28 mm
Ais usbc
xenbedded/pixel-c-support
Support hardware and software for running custom code on the Google Pixel C.
61 parts
2 layers40 × 29 mm
Reverse battery protection
voltlog/reverse-battery-protection6More info about this project in Voltlog #353.
- Size
- 40 × 29 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 19
- Nets
- 29
- Pads
- 67
- Tracks, vias
- 124, 14
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 2 Mar 2021
- Updated
- 3 Mar 2021
Overview
Reverse battery protection is an open-source printed circuit board by voltlog, from the voltlog/reverse-battery-protection repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 40 × 29 mm with 19 parts on 29 nets, routed with 124 tracks and 14 vias.
It is built around the ATTINY48-MMU and DMG1012T-7. Its parts include 3 resistors, 1 capacitor, 1 IC, 1 diode and 1 transistor. It belongs with the power boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
2
ATTINY48-MMU
QFN-28-EP(4x4)-40℃~+85℃ 1.8V~5.5V 12MHz 24 256Byte 4KB 64Byte 8 Bit AVR Built-in FLASH QFN-28-EP(4x4) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
DMG1012T-7
SOT-523-55℃~+150℃ 1 N-channel 150mW 20V 500mA 700mΩ@4.5V 750pC 900mV N-Channel ±6V SOT-523 MOSFETs ROHSKUUMOSFETs
README
README.mdReverse Battery Protection Using N-ch Mosfet
I designed this circuit to show a simple circuit to achieve reverse battery protection in low power devices. Everyone knows the classic solution of using an in-line diode but that has one major drawback: the voltage drop on the diode. If your circuit is powered by a CR2032 you can’t afford losing 0.5V on the diode. The circuit I’m showing uses a mosfet to achieve the protection feature but minimises the voltage drop and the losses because a mosfet will have a very low internal resistance when conducting.
More info about this project in Voltlog #353.
Parts
19| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | TestPoint | TestPoint:TestPoint_Pad_1.0x1.0mm | TP1, TP2, TP3, TP4 |
| 3 | Fiducial | Fiducial:Fiducial_0.5mm_Mask1mm | FID1, FID2, FID3 |
| 1 | 0.1uF | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | 100K | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | 120R | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 1K | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | ATtiny48-MMU | Package_DFN_QFN:QFN-28-1EP_4x4mm_P0.45mm_EP2.4x2.4mm | U1 |
| 1 | AVR-ISP-6 | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J1 |
| 1 | Battery_Cell | Battery:BatteryHolder_Keystone_1060_1x2032 | BT1 |
| 1 | DMG1012T-7 | Voltlog:sot-523 | Q1 |
| 1 | Jumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP1 |
| 1 | LED_ALT | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | SW_Push | Button_Switch_SMD:SW_Push_1P1T_NO_6x6mm_H9.5mm | SW1 |
| 1 | VOLTLOG_LOGO | Voltlog:voltlog_mask_3mm | V1 |
Questions
How big is the Reverse battery protection PCB?
It measures 40 × 29 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Reverse battery protection use?
19 parts, built around the ATTINY48-MMU and DMG1012T-7. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Reverse battery protection KiCad files?
From the voltlog/reverse-battery-protection repository on GitHub, at the commit this page was made from: the board is reverse.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Reverse battery protection design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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