MCP16501 datasheet(16/42 Pages) MICROCHIP

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MCP16501

DS20006388E-page 16

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4.3.2

nSTRT, nSTRTO, PWRHLD

FUNCTIONALITY

The nSTRT (push button input) serves as an external

wake-up input to the PMIC+MPU system. nSTRT is

internally pulled up to VIN and monitored. When the

nSTRT is pulled/detected as low (e.g., by means of a

push button or any other pull-down device) for longer

than a minimum debouncing time, the MCP16501

initiates the turn-on sequence.

The nSTRTO signal is asserted low whenever the

nSTRT is detected to be low; otherwise, it is High-Z

(typically, nSTRTO has an external pull-up resistor).

The only exception to this input (nSTRT)/output

(nSTRTO) relationship is the so called Automatic

Wake-up Pulse (AWKP) that is described in

Section 4.4.6 “Restart Sequence After Fault and

Automatic

Wake-up

Pulse

(AWKP)

Genera-

tion-MCP16501D only”(applicable to MCP16501D

only).

After the start-up sequence has been initiated, the

MCP16501 expects the assertion of the PWRHLD

signal (Power-Hold) from the MPU to validate the

start-up. PWRHLD could already be high in a typical

application using a backup supply. If PWRHLD has not

been asserted high by the MPU before the completion

of the start-up sequence (i.e., when nRSTO is about to

be asserted high), the MCP16501 will automatically

initiate a turn-off sequence.

During run time (PWRHLD = High), the nSTRT (thus

nSTRTO) can again be asserted low. No automatic

action is taken by the MCP16501 in this case.

4.3.3

nSTRT/PWRHLD TYPICAL USE

CASES

Depending on the presence of a backup supply and the

availability of an external wake-up signal connected at

nSTRT (push button input), four different scenarios can

be defined for the turn-on of the MCP16501 as

described in Figure 4-1.

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