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Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

== Summary ==
The UPS HAT (C) is an uninterruptible power supply for the Raspberry Pi Zero series. It provides stable 5 V output, manages LiPo battery charging via an integrated charge controller, and monitors voltage, current and state of charge over I2C.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL19739 WSAL19739 – Uninterruptible Power Supply UPS HAT For Raspberry Pi Zero, Stable 5V Power Output]

== Technical overview ==
* Connects to Raspberry Pi Zero / Zero 2W via spring pogo pins on the board.
* ETA6003 charge manager with dynamic path management for stable battery charging.
* TPS61088 boost regulator provides a regulated 5 V output.
* INA219 measures voltage and current in real time over I2C; address per FAQ: 0x43.
* S8261/FS8205 protection circuitry offers overcharge, overdischarge, overcurrent and short-circuit protection.
* Supported battery: 803040 LiPo, 3.7 V, 1000 mAh (not included).
* HAT dimensions: 65 × 30 mm, mounting hole 3.0 mm.
* Micro USB port is the 5 V charging input; LED on while charging, off when fully charged.
* Set the power switch to OFF before inserting the battery to avoid shorting the board.
* After inserting a new or replaced battery, it must be charged first so the protection circuitry activates.

'''Commands and examples – verify before use:'''
<syntaxhighlight lang="text">
sudo raspi-config
sudo reboot
sudo apt-get install p7zip
wget https://files.waveshare.com/upload/4/40/UPS_HAT_C.7z
7zr x UPS_HAT_C.7z -r -o./
cd UPS_HAT_C
python3 INA219.py
sudo apt-get install i2c-tools
sudo i2cdetect -y 1
sudo apt-get install python-smbus
sudo apt-get install python3-smbus
</syntaxhighlight>

== Notes and version constraints ==
* The listed I2C address 0x43 comes from the FAQ section of the source; if the device is not detected, check pogo-pin contact and, if needed, solder the pin header.
* If the battery does not work after first insertion, it must be charged for a while to activate the protection circuitry.
* If the load draws too much current, the Pi may repeatedly reboot because available output current decreases as battery voltage drops (~1.8 A at full charge).
* The capacity readout is derived from battery voltage and deviates from actual capacity while charging.
* For operation with a larger battery (e.g. 5000 mAh), the voltage must remain 3.7 V; capacity itself is not a restricting factor, but no explicit confirmation exists for form factors other than 803040.
* If 'No module named smbus' appears, install python-smbus or python3-smbus.

== Source and revision record ==
* [https://www.waveshare.com/wiki/UPS_HAT_(C) UPS HAT (C) - Waveshare Wiki]
* Source revision: 87392
* Captured: 2026-09-02T02:46:59+00:00
* SHA-256: <code>2d6be09dc2f9db0ef374b4f737914df0c6c525e8fc1579bfe6c43fdc9e704a05</code>

WSAL19739 – UPS HAT (C)/en - Versionsgeschichte

JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex