jfm92/powerTimer49Module to jump from miliAmperes to nanoAmperes on Idle mode.
PowerTimer is an open-source printed circuit board by jfm92, from the jfm92/powerTimer repository on GitHub. It is a 2-layer board of 35.4 × 25.6 mm with 33 parts on 19 nets, routed with 173 tracks and 33 vias.
It is built around the AO3401A, LL4148 and S8050H, with the TAJA475K016RNJ and TS-1185EC-C-D-B among its other parts. Its parts include 12 resistors, 5 transistors, 4 diodes, 3 capacitors and 2 connectors.
The Power Timer is an ultra-low power module that allows you to control the output power by software. It is mainly based on a Real-Time Clock (RTC) and an RS circuit. Thanks to the RTC, you can control the exact wake-up date or the periodicity. It also allows for external interruptions, which gives you the benefits of ultra-low power consumption while being able to connect other types of sensors. The module is based on the RV3028-C7 chip. It is also compatible with Arduino, thanks to its custom library.
The sleep current of the module is around 50nA at 3.3V, making it ideal for battery-powered applications.
Demo with software sleep modes:
Same demo with powerTimer:
The module is designed to be a versatile power control unit for your projects. It can be used as a simple timer to power on a device at a specific time or periodically, or it can be used as a power management unit that can be woken up by external events.
The PCB is divided into two parts:
Input: The input voltage (VINput) can be from 1.1V to 5.5V. This wide input range makes it compatible with a variety of power sources, from a single-cell Li-Po battery to a 5V power supply.
Output:
The logic levels of the I2C bus and the external interrupt input depend on the selected input voltage.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 10K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R3, R5, R6, R10, R11, R14 |
| 4 | 100K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R2, R4, R7, R8 |
| 4 | MountingHole | MountingHole:MountingHole_2.2mm_M2_ISO7380 | H1, H2, H3, H4 |
| 3 | AO3401A | Package_TO_SOT_SMD:SOT-23 | Q1, Q4, Q5 |
| 3 | LL4148 | Diode_SMD:D_MiniMELF | D1, D2, D3 |
| 2 | S8050H | RTCSwitch:SOT-23-3_L2.9-W1.6-P1.90-LS2.8-BR | Q2, Q3 |
| 1 | 0805G (Green) | RTCSwitch:LED0805-R-RD | LED1 |
| 1 | 100nF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1 |
| 1 | 10uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C2 |
| 1 | 470 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R9 |
| 1 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | Conn_01x06 | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J2 |
| 1 | LOGO | LOGO | G*** |
| 1 | RV-3028-C7 32.768KHZ 1PPM TA QC | RTCSwitch:OSC-SMD_8P-L3.2-W1.5-P0.90-BL | U1 |
| 1 | TAJA475K016RNJ | RTCSwitch:CASE-A_3216 | C3 |
| 1 | TS-1185EC-C-D-B | RTCSwitch:SW-SMD_4P-L3.7-W3.0-P1.50-LS4.7 | SW1 |
It measures 35.4 × 25.6 mm and has 2 copper layers, 1.6 mm thick.
33 parts, built around the AO3401A, LL4148, S8050H and TAJA475K016RNJ. 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.
From the jfm92/powerTimer repository on GitHub, at the commit this page was made from: the board is powerTimerPCB/powerTimer.kicad_pcb and its schematic powerTimerPCB/powerTimer.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask jfm92 before reusing the design.
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