AS3709 datasheet(33/74 Pages) AMSCO

33 / 74 page

ams Datasheet, Confidential: 2013-Aug [1-02]

AS3709 – 33

Detaile d Desc rip t ion - S y st em Fu nc tions

PWRGOOD Output

This signal will go high at the end of the start-up sequence. This

can be used as a second reset signal to the processor to e.g.

start oscillators.

The gpioX_mode should be set to output.

Supervisor

All Step-Down DCDCs have an integrated over-current

protection.

An over-temperature protection of the chip is also integrated

which can be switched on with the serial interface signal

temp_pmc_on (enabled by default; it is not recommended to

disable the over-temperature protection).

Temperature Supervision

The chip has two signals for the serial interface: ov_temp_110

and ov_temp_140.

The flag ov_temp_110 is automatically reset if the

overtemperature condition is removed, whereas ov_temp_140

has to be reset by the serial interface with the signal

rst_ov_temp_140. If the flag ov_temp_140 is set, an automatic

reset of the complete chip is initiated. The chip will only start-up

when the temperature falls below the T110 level (including

hysteresis). The flag ov_temp_140 is not affected by this reset

cycle allowing the software to detect the reason for this

unexpected shutdown.

Figure 44:

Over-Temperature Protection

Symbol

Parameter

Min

Typ

Max

Unit

T110

ov_temp_110 rising threshold

110

125

°C

T140

ov_temp_140 rising threshold

125

140

155

°C

THYST

ov_temp_110 and ov_temp_140 hysteresis

°C

AS3709 数据表(PDF) 33 Page - ams AG

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