MCP73837AMIMF datasheet(19/30 Pages) MICROCHIP

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DS22071A-page 19

MCP73837/8

5.2.2

USB-PORT CURRENT

REGULATION SELECT (PROG2)

For the MCP73837/8, driving the PROG2 input to a

logic Low selects the low charge current setting

(maximum 100 mA). Driving the PROG2 input to a logic

High selects the high charge current setting (maximum

500 mA).

TABLE 5-1:

STATUS OUTPUTS

5.2.3

POWER GOOD (PG) OPTION

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

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

current. However, there is a diode path back to the

input, and as such, the output should be pulled up only

to the input. The PG output is low whenever the input

to the MCP73837 is above the UVLO threshold and

greater than the battery voltage. If the supply voltage is

above the UVLO, but below VREG(typical)+0.3V, the

MCP73837 will pulse the PG output as the device

determines if a battery is present. The PG option is

available only on MCP73837.

5.2.4

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. The TE option is

available only on MCP73838.

5.2.5

DEVICE DISABLE (PROG1/2)

The current regulation set input pin (PROG1/2) can be

used to terminate a charge at any time during the

charge cycle, as well as to initiate a charge cycle or to

initiate a recharge cycle. Placing a programming

resistor from the PROG1/2 input to VSS enables the

device. Allowing the PROG1/2 input to float or applying

a logic-high input signal, disables the device and

terminates a charge cycle. When disabled, the device’s

supply current is reduced to 75 µA, typically.

CHARGE CYCLE STATE

STAT1

STAT2

Shutdown

Hi-Z

Standby

Hi-Z

Preconditioning

Hi-Z

Constant Current

Hi-Z

Constant Voltage

Hi-Z

Charge Complete - Standby

Hi-Z

Temperature Fault

Hi-Z

Timer Fault

Hi-Z

System Test Mode

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