MCP73871 datasheet(22/36 Pages) MICROCHIP

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MCP73871

DS20002090F-page 22

 2008-2022 Microchip Technology Inc. and its subsidiaries

5.2.2

AC-DC ADAPTER AND USB PORT

POWER SOURCE REGULATION

SELECT (SEL)

With the SEL input low, the MCP73871 device is

designed to provide system power and Li-Ion battery

charging from a USB input while adhering to the current

limits governed by the USB specification. The host

microcontroller has the option to select either

a 100 mA (L) or a 500 mA (H) current limit based on

the PROG2 input. With the SEL input high, the

MCP73871 device limits the input current to 1.8A. The

programmed charge current is established using a

single resistor from PROG1 to VSS when driving SEL

high.

5.2.3

USB PORT CURRENT

REGULATION SELECT (PROG2)

Driving the PROG2 input to a logic low selects the low

USB port source current setting (maximum 100 mA).

Driving the PROG2 input to a logic high selects the high

USB port source current setting (maximum 500 mA).

5.2.4

POWER GOOD (PG)

The power good (PG) option is a pseudo open-drain

output. The PG output can sink current, but not source

current. The PG output must not be pulled up higher

than VIN because there is a diode path back to VIN. The

PG output is low whenever the input to the MCP73871

device is above the UVLO threshold and greater than

the battery voltage. The PG output can be used as an

indication to the system that an input source other than

the battery is supplying power.

5.2.5

TIMER ENABLE (TE) OPTION

The timer enable (TE) input option is used to enable or

disable the internal timer. A low signal on this pin

enables the internal timer and a high signal disables

the internal timer. The TE input can be used to disable

the timer when the charger is supplying current to

charge the battery and power the system load. The TE

input is compatible with 1.8V logic.

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