Microchip Technology MCP7386X, Руководство пользователя

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Installation and Operation
©
2006 Microchip Technology Inc. DS51475C-page 9
2.3.4 Battery Headers
Independent battery connections are provided. The battery pack positive terminal
should be connected to J5 (V
BAT
+). The battery pack negative terminal should be
connected to J6 (V
BAT
–). In addition, a connection is provided for a nominal 10 k
Ω
at
+25°C NTC thermistor, situated in the battery pack for temperature sensing. When the
cell temperature is between -5°C and +55°C, installed resistors provide a charging
window when a thermistor with a sensitivity index (
β
) of 3982 is utilized. Charging is
inhibited when the cell temperature deviates outside the preset window. The resistor
values can be adjusted to provide the desired charging window for a variety of
thermistors. Refer to the MCP73861/2/3/4 data sheet (DS21893) for details.
2.3.5 Device Support Options
The MCP7386X Battery Charger Evaluation Board supports the entire MCP7386X
family. The MCP7386X Battery Charger Evaluation Board is provided with one
reference design utilizing the MCP73861. Alternate devices can be substituted in
order to evaluate the different MCP7386X family options.
2.3.6 Microcontroller Option
Connection points provide easily-accessible locations for interface to a host
microcontroller. The host microcontroller can be used to disable the charger, monitor
charge status or terminate a charge.
2.3.7 Output Voltage Options
The MCP7386X Battery Charger Evaluation Board is provided with a
Constant-Voltage mode output voltage of 4.2V per cell, the evaluation of which can be
achieved by moving resistor R
4
to R
3
, or by shorting the R
3
pads.
Note: Improper connection of the battery may result in damage to the battery
and increase the possibility of personal injury. It is also important to avoid
shorting the battery terminals together.