싱글셀 리튬 배터리 충전 모듈 -RT9471
(CHARGER 17 CLICK)
개요
- 본 제품은 싱글셀 리튬 배터리 충전 모듈 -RT9471입니다.
- 3A 싱글셀 스위칭 배터리 충전칩 RT9471 을 탑재하고 있는 제품입니다.
- 싱글셀 리튬이온 및 리튬 폴리머 배터리 충전에 사용이 가능한 제품입니다.
특징
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HOW DOES IT WORK?
Charger 17 Click is based on the RT9471, a 3A single-cell switching battery charger from Richtek. The RT9471 supports USB OTG current and voltage limit regulations. In addition, the charger supports several protection features, such as over-temperature, VBUS over-voltage, battery over-voltage, system over-voltage, system under-voltage, and more. The Charger 17 Click for power input uses a USB C connector and 5V, where in addition, you can use a VBUS/GND header for powering it from another external source as the VBUS RT4971 input has an operating range from 3.9 up to 13.5V. Charger 17 Click uses a properly labeled JST connector for connecting a battery, and one should take note of the battery polarity as the JST battery connector is NOT standardized. In addition to the battery connector, there is an SYS/GND header as a converter output connection point.
The device provides automatic power path selection to the supply system from the USB C connector, the connected battery, or both of them over the VSYS/GND header. There is a shipping mode that allows you to turn the battery off when shipping or in storage, thus extending the battery life. During charge status, the charger monitors the battery's voltage and selects the appropriate mode (battery supply mode to charge battery mode). In USB OtG applications, the RT9471 can achieve up to 92% boost efficiency at 1A with a 3.8V battery and a 5.15V output voltage. The RT9471 charger indicates how good the power source is over the power good PG LED indicator. This status includes applied VBUS when not in Sleep mode, charger thermal values under threshold settings when not in HZ mode, and more. The charging status can be visually monitored over the STAT LED indicator.
The RT9471 supports JEITA protection during charge mode. The charger can measure the battery's temperature over the TEMP/GND header and the additional NTC thermistor. This feature can be selected from the TEMP REF solder jumper, which is set to the internal position by default. In both ways, the temperature window is programmed over the resistor divider. The device will stop charging the battery if the battery's temperature is lower than T1 or higher than T4 values. For more information, please check the attached datasheet.
Charger 17 Click uses a standard 2-Wire I2C interface to communicate with the host MCU, with speeds up to 3.4Mbits. There are some other functionalities for this Click board™, such as charge enable CE pin where you can turn off battery charging when driving this pin LOW. You can also control the BATFET over the QON pin. That includes exiting the shipping mode and system reset. You can select a power source current limit between 0.5A and 2.4A over the PSL pin. The charger can alert poor source detection, VBUS source type detection, and other events over the INT interrupt pin.
This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used, as a reference, for further development.
SPECIFICATIONS
Type Battery charger Applications Can be used for the development of Li-Ion/Polymer battery chargers for portable devices and accessories, power tools, and more On-board modules RT9471 - 3A single-cell switching battery charger from Richtek Key Features JST connector for charging single-cell Li-Ion and Li-Polymer batteries, USB C external power supply, or over the VBUS/GND header, high charger efficiency, high boost efficiency, supports USB On-the-Go with current and voltage limit regulation, up to 3150mA of current charging range, over-temperature protection, VBUS over-voltage protection, battery over-voltage protection, and more Interface I2C ClickID No Compatibility mikroBUS Click board size M (42.9 x 25.4 mm) Input Voltage 3.3V