MIKROE-2858

MIKROE-2858 Datasheet

PID MIKROE-2858

Part	Datasheet
MIKROE-2858	MIKROE-2858 (pdf)

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MCP73871 click PID MIKROE-2858 MCP73871 click is a fully integrated solution for system power delivery and Li-Po/Li-Ion battery charge management. The click features many Li-Po/Li-Ion battery charging optimizations, used to maximize the battery life. Some of the MCP73871 click features include constant current and voltage charging algorithms, overvoltage protection, automatic end of charge control, automatic recharge feature, preconditioning for depleted cells and thermal management. All these features, coupled with the ability to simultaneously power up the system load and charge the connected battery, make this click a perfect solution for powering up many different battery-operated builds and projects, which use a rechargeable Li-Po/Li-Ion battery, but can also switch to an external power source. How does it work MCP73871 click uses the MCP73871 device, a system load sharing and Li-Po/Li-Ion battery charge management integrated circuit from Microchip. This device completely manages the power distribution, utilizing many different steps in this process. The input voltage is constantly monitored and with no battery connected or with a battery element which is deeply depleted, the power to the connected load will be delivered straight from the external power supply, provided from the 5V rail of the mikroBUS socket. The current that can be delivered in this mode, depends on the limiting factor selected by the PRG2 pin. If the PRG2 pin is set to a LOW logic level, the current will be limited to 80mA - 100mA. If the PRG2 pin is set to a HIGH logic level, the current supplied to the load will be limited to 400mA 500mA. There are several conditions set by the MCP73871 device, that define the behavior of the power management logic. If there is a Li-Po/Li-Ion battery connected to the battery connector, the charging procedure will go through the following steps: • If the connected battery is deeply depleted and the CE Charge Enable pin is set to a HIGH logic level, the preconditioning mode is activated. The charging current is only a fraction of the regulated charging current, used for fast charging, preventing battery damage and overheating. • If the battery voltage is above the preconditioning threshold voltage set by the MCP73871 device, the fast charging will begin, and the charging current is set by the PRG2 pin, like described above and a voltage equal to 4.35V, as per factory settings of the MCP73871 IC. • When the charging complete conditions are met, the charger circuit will stop the charging process. The battery voltage is monitored, and when it falls under the recharge threshold, another charging cycle will be repeated. • During all the charging modes, the temperature of the MCP73871 die is monitored, so the charging current is regulated accordingly. The overtemperature protection will put the device in the shutdown mode, preventing damage. • If the Timer is enabled by the TE pin, it will be used to limit the charging time, if the battery voltage never reaches the end-of-charge condition. The MCP73871 power-sharing system logic, enables to simultaneously charge and power up the system load, connected to the onboard output screw terminal. The power-sharing system is active at all times and always prioritizes connected load over the battery charging. Li-Po/Li-Ion battery can be connected to the onboard 2.54mm two-pin header. There are three LEDs that are used to indicate power good status, as well as the charging status. The status LED signalization is explained in the Status LED table, below. Specifications Type Battery charger A perfect solution for powering up many different battery-operated builds and projects, which are powered up by a rechargeable Li-Po/Li-Ion battery, but can also switch to an external power source while charging the battery. On-board modules Microchip's MCP73871 - Stand-Alone System Load Sharing and Li-Ion/Li-Po Battery Charge Management Controller Key Features Ability to simultaneously power up the system load and charge the connected Li-Ion/LiPo battery by applying optimized battery charging algorithm. Interface GPIO Input Voltage 5V Click board size M x mm Pinout diagram This table shows how the pinout on MCP73871 click corresponds to the pinout on the mikroBUS socket the latter shown in the two middle columns . Notes Notes Set Charging Current Charge Enable PG2 1 AN PWM 16 TE Enable Safety Timer NC 2 RST INT 15 NC CE 3 CS RX 14 NC 4 SCK TX 13 NC NC 5 MISO SCL 12 NC NC 6 MOSI SDA 11 NC NC 7 3.3V 5V 10 +5V Power Supply Ground GND 8 GND 9 GND Ground MCP73871 click electrical specifications Min Typ Max Unit Charge Current if PG2 is low 80

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MCP73871 click

PID MIKROE-2858

MCP73871 click is a fully integrated solution for system power delivery and Li-Po/Li-Ion battery charge management. The click features many Li-Po/Li-Ion battery charging optimizations, used to maximize the battery life. Some of the MCP73871 click features include constant current and voltage charging algorithms, overvoltage protection, automatic end of charge control, automatic recharge feature, preconditioning for depleted cells and thermal management.

All these features, coupled with the ability to simultaneously power up the system load and charge the connected battery, make this click a perfect solution for powering up many different battery-operated builds and projects, which use a rechargeable Li-Po/Li-Ion battery, but can also switch to an external power source.

How does it work

MCP73871 click uses the MCP73871 device, a system load sharing and Li-Po/Li-Ion battery charge management integrated circuit from Microchip. This device completely manages the power distribution, utilizing many different steps in this process.

The input voltage is constantly monitored and with no battery connected or with a battery element which is deeply depleted, the power to the connected load will be delivered straight from the external power supply, provided from the 5V rail of the mikroBUS socket. The current that can be delivered in this mode, depends on the limiting factor selected by the PRG2 pin. If the PRG2 pin is set to a LOW logic level, the current will be limited to 80mA - 100mA. If the PRG2 pin is set to a HIGH logic level, the current supplied to the load will be limited to 400mA 500mA.

There are several conditions set by the MCP73871 device, that define the behavior of the power management logic. If there is a Li-Po/Li-Ion battery connected to the battery connector, the charging procedure will go through the following steps:
• If the connected battery is deeply depleted and the CE Charge Enable pin is set to a HIGH logic level, the preconditioning mode is activated. The charging current is only a fraction of the regulated charging current, used for fast charging, preventing battery damage and overheating.
• If the battery voltage is above the preconditioning threshold voltage set by the MCP73871 device, the fast charging will begin, and the charging current is set by the PRG2 pin, like described above and a voltage equal to 4.35V, as per factory settings of the MCP73871 IC.
• When the charging complete conditions are met, the charger circuit will stop the charging process. The battery voltage is monitored, and when it falls under the recharge threshold, another charging cycle will be repeated.
• During all the charging modes, the temperature of the MCP73871 die is monitored, so the charging current is regulated accordingly. The overtemperature protection will put the device in the shutdown mode, preventing damage.
• If the Timer is enabled by the TE pin, it will be used to limit the charging time, if the battery voltage never reaches the end-of-charge condition.

The MCP73871 power-sharing system logic, enables to simultaneously charge and power up the system load, connected to the onboard output screw terminal. The power-sharing system is active at all times and always prioritizes connected load over the battery charging. Li-Po/Li-Ion battery can be connected to the onboard 2.54mm two-pin header. There are three LEDs that are used to indicate power good status, as well as the charging status. The status LED signalization is explained in the Status LED table, below.

Specifications

Type

Battery charger

A perfect solution for powering up many different battery-operated builds and projects, which are powered up by a rechargeable Li-Po/Li-Ion battery, but can also switch to an external power source while charging the battery.

On-board modules

Microchip's MCP73871 - Stand-Alone System Load Sharing and Li-Ion/Li-Po Battery Charge Management Controller

Key Features

Ability to simultaneously power up the system load and charge the connected Li-Ion/LiPo battery by applying optimized battery charging algorithm.

Interface

GPIO

Input Voltage 5V

Click board size

M x mm

Pinout diagram

This table shows how the pinout on MCP73871 click corresponds to the pinout on the mikroBUS socket the latter shown in the two middle columns .

Notes

Notes

Set Charging Current Charge Enable

PG2 1 AN PWM 16 TE Enable Safety Timer NC 2 RST INT 15 NC CE 3 CS RX 14 NC 4 SCK TX 13 NC

NC 5 MISO SCL 12 NC

NC 6 MOSI SDA 11 NC

NC 7 3.3V 5V 10 +5V Power Supply

Ground

GND 8 GND 9 GND Ground

MCP73871 click electrical specifications

Min Typ Max Unit

Charge Current if PG2 is low 80

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived MIKROE-2858 Datasheet file may be downloaded here without warranties.

Datasheet ID: MIKROE-2858 649459