PT6105-Multi-cell Battery Management Front End with I2C Interface

GENERAL DESCRIPTION
    The PT6105 is a highly integrated, digitally programmable, charging/discharging management IC for 3 to 7 serially connected Li-Ion or LiFePO4, batteries used in portable electrical tools or other multi-cell battery powered systems. It contains a multi-channel 10-bit ADC digitizing battery voltages, environment temperature, and battery discharge current. The converted data is transferred to MCU via I2C interface and is used for battery balancing and safety protections against battery over-voltage, under-voltage, discharging over current, and over temperature. The integrated battery balance circuitry could deliver a programmable shunt current as high as 200mA without the need of external transistors. The PT6105 buffers both DC and PWM (Pulse Width Modulation) MOSFET control signals generated from MCU to drive an electrical motor. Key parameters in the PT6105 are programmable by a microprocessor through an I2C interfacing port, which features customers to achieve flexible and optimal multi-cell Li-ion/LiFePO4 battery charging/discharging progress control and safety protection. The package is QFN-24.

FEATURES
Charging Control
􀂂 3~7 Li-ion or LiFePO4 battery cells system
􀂂 Cell balancing with programmable shunt currents up to 200mA
􀂂 Accurately sensing battery cell voltages and temperature through a 10-bit ADC.
􀂂 MCU controlled protection cutoff voltages.
Discharging
􀂂 Programmable discharge over-current or short-circuit protection thresholds
􀂂 MCU controlled battery under-voltage protection thresholds
􀂂 10~15V PWM or DC MOSFET gate driving voltages
􀂂 200mA maximum MOSFET gate driving current
􀂂 Load protection to prevent discharging on short-circuit or light load between two
terminals connected to the motor
MCU Interfacing
􀂂 A 10-bit ADC samples up to 7 individual cell voltages, environmental temperature, and discharge current.
􀂂 ADC sampling time <20ms through all channels
􀂂 ADC fail bit indicates overflow
􀂂 100 kHz I2C communication port
􀂂 2 seconds watchdog function for MUC.
􀂂 5~3.2V supply voltage to MCU
Other Protections
􀂂 6V under voltage lockout voltage (UVLO)
􀂂 Protected from <1.0ms negation glitch toward ground generated from battery pack
􀂂 Internal over temperature shutdown (TSD)