Datasheet

MCP1631HV Multi-Chemistry Battery Charger Reference Design

FIGURE 2-4: Simulated Battery Load.

2.3.1.3 SELECTING BATTERY CHEMISTRY AND NUMBER OF CELLS

• Three push buttons are used to start a charge cycle, select chemistry and select

number of series cells. There are two LEDs, (red - NiMH, green - Li-Ion, red +

green - LED Driver) used to indicate chemistry type and four yellow LEDs to

indicate the number of series cells selected (D6, D7, D8, D9).

• S1 (ON/OFF) is used to start and stop the charge cycle or to enter the program-

ming mode. When the input voltage is within the specified operating range (+5.3V

to +16V), press and hold the ON/OFF button for 5 seconds, all LEDs with the

exception of D3 should be illuminated. Release S1 and STATUS LED (D3) will be

flashing, indicating that the board is in programming mode.

• Press S2 (CHEM) to select the desired chemistry, indication is provided by red

LED D4 (Li-Ion) or green LED D5 (NiMH/NiCd) or both (LED Driver).

• Press S3 (CELLS) to select the number of series cells, indication is provided by

yellow LEDs D6 thru D9 where D6 = bit 0 and D9 = bit 3 of a 4-bit hexadecimal

value.

• Once the desired chemistry and number of cells is selected, press S1 (ON/OFF)

to store the settings. The selected chemistry LED and number of series cells LED

both should be illuminated.

• To start a charge cycle press and release S1. D3 (green) will be illuminated

indicating a charge cycle has begun, the selected chemistry LED should flash

slowly indicating normal charge cycle conditions.

• If the chemistry LED is not flashing and the Status LED is flashing, a fault

condition has persisted for 5 attempts indicating that the charge cycle has

terminated.

• Remove input voltage and check connections and verify the proper battery pack

chemistry and number of series cells.

• Once the problem is corrected, apply the input voltage, verify chemistry and # of

cells LEDs and press S1 to start a charge cycle.

BAT+

BAT–

Variable

Power Supply

0V - 6V

1,000 µF

10V Al

2Ω

10W

Note: For single cell Li-Ion, a 3600 mA-Hr battery with internal protection circuitry

is recommended for evaluation. For NiMH charge cycle, Panasonic

HHR-210AA/B2B were used to develop the -dV/dt and +dT/dt termination

methods.