PowerBank Click is a USB charging expansion board which can be used for creating power bank devices or adding charging option to your device. For battery charging management this board uses MP2632B a highly integrated 3A Lu-ion and Li-polymer battery charger from Microchip. In addition to battery charger PowerBank Click also has a MCP3221 analog to digital converter, which is serving for monitoring battery voltage over I2C interface. Beside battery charging and monitoring feature, this board also has an operation section button, notification LEDs for operational mode selection and battery status. Power banks are popular for charging USB charged devices and can be used as a power supply for various USB powered devices such as lights and small fans.
PowerBank Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.
PowerBank Click can supply power from the connected battery through a USB port as well as charge the battery. The MP2632B can operate in both charge mode and boost mode to allow for full-system and battery-power management. It has an integrated VIN-to-SYS pass-through path to pass the input voltage to the system. The pass-through path has built-in over-voltage (OVP) and over-current protection (OCP) and a higher priority over the charging path.
This board can also re-charge connected battery from microUSB connector on the bottom side by providing input power. When the input power is present, the MP2632B operates in charge mode. The MP2632B detects the battery voltage automatically and charges the battery in three phases: trickle current, constant current, and constant voltage. Other features include charge termination and auto-recharge. The MP2632B also integrates both input current limit and input voltage regulation to manage the input power and prioritize the system load.
In the absence of an input source, the MP2632B switches to boost mode through PB to power SYS from the battery. In boost mode, the OLIM pin programs the output current limit, and the MP2632B turns off at light load automatically. The MP2632B also allows for output short-circuit protection (SCP) to disconnect the battery completely from the load in the event of a short-circuit fault. Normal operation resumes once the short-circuit fault is removed.
The operational mode selector button on the PowerBank Click has few purposes. If the button is pressed for more than 1.5ms, the boost is enabled and latched if V IN is not available. LEDs 1-4 are ON for five seconds whenever the button is pressed for more than 1.5ms. If the button is pressed for more than 1.5ms twice within one second, it serves as a torch light ON/OFF switch. If the button is held pressed for more than 2.5 seconds, this is defined as a long push, and boost is shut down manually.
A 4-LED driver is integrated for voltage-based fuel gauge indication. Together with torch-light control, the MP2632B provides an all-in-one solution for power banks and similar applications without an external microcontroller.
The PowerBank Click is also equipped with a MCP3221, a successive approximation A/D converter (ADC) with a 12-bit resolution to monitor battery voltage over I2C bus over mikroBUS™ socket.
This Click board™ is designed to be operated only with 5V logic level. A proper logic voltage level conversion should be performed before the Click board™ is used with MCUs with logic levels of 3V3.
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