MCP73830 datasheet(12/22 Pages) MICROCHIP

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MCP73830/L

DS20005049D-page 12

 2011-2014 Microchip Technology Inc.

5.9

Thermal Shutdown

The MCP73830/L suspends charging if the die tem-

perature exceeds +150°C. Charging will resume when

the die temperature has cooled by approximately

10°C. The thermal shutdown is a secondary safety

feature in the event that there is a failure within the

thermal regulation circuitry.

5.10

Status Indicator

The charge status output of the MCP73830/L is open-

drain, and, as such, has two different states: Low (L),

and High-Impedance (High Z). The charge status out-

puts can be used to illuminate the LEDs. Optionally,

the charge status output can be used as an interface

to a host microcontroller. The faulty indication of a pre-

conditioning timer also indicates defective batteries,

when it fails to pass preconditioning threshold during

the given time.

Table 5-1 summarizes the state of the status outputs

during a charge cycle.

TABLE 5-1:

STATUS OUTPUTS

Charge Cycle State

STAT

Shutdown

High Z

No Battery Present

High Z

Preconditioning

Constant Current Fast Charge

Constant Voltage

Charge Complete

High Z

Timer Fault

High Z

Preconditioning Timer Fault

Flashing

(2 Hz)

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