Datasheet

MCP1631HV Multi-Chemistry Battery Charger Reference Design

2.3.1.5 CHARGE PROFILE

•Li-Ion

- Qualification: Precharge at 200 mA for V

CELL

< 3.0V

- Constant Current = 2A for 1 Cell, 1A for 2 Cell

- Constant Voltage = 4.20V, User Calibrated

- Charge Termination = 140 mA for 1 Cell and 2 Cell

- Overvoltage Detection, once detected, attempt to restart charge cycle 5 times,

if overvoltage is persistent, terminate attempts and flash STATUS LED.

• NiMH/NiCd

- Qualification: Precharge at 200 mA for V

CELL

< 0.9V.

- Constant Current = 1.5A for 1 to 5 Cells.

- Terminate Fast Charge for -dV/dT or +dT/dt.

- Timed 50 mA top off charge for 1 hour.

- Overvoltage Detection, once detected, will attempt to restart charge cycle five

times. If overvoltage is still present, charging will terminate and STATUS LED

will flash.

• LED Driver

- Constant Current = 0 to 300 mA for 1 to 2 LEDs.

- Pressing CHEM switch increments output current. Limited to 300 mA.

- Pressing CELLS switch decrements output current. Limited to 0 mA.

- Overvoltage Detection, once detected, will attempt to restart charge cycle five

times. If overvoltage is still present, charging will terminate and STATUS LED

will flash.

2.3.1.6 PROGRAMMING

Header J3 is provided for in-system circuit programming using either ICD 2 or

PICkit

™

2.3.1.7 DATA LOGGING

Header J5 is provided for serial data logging using the PICkit

™

Serial Analyzer. The

source code for the evaluation board contains the code necessary to transmit data via

a PICkit

™

Serial interface to a PC running the PICkit Serial Analyzer GUI interface. The

data currently logged consists of charging current setpoint, output voltage, temperature

thermistor voltage, current system state, and termination code.

The data logging feature allows the user to create and save a complete charging profile

for a specific battery pack. The interface software provided with the PICkit Serial

Analyzer allows the user to save the logged data to a file.