AS3715 datasheet(70/160 Pages) AMSCO

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ams Datasheet, Confidential

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[v1-00] 2014-Sep-10

AS3715 − Detailed Description – System Functions

Supervisor

All LDO’s, the DCDC step ups and DCDC step downs 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 (main die)

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 over-temperature 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 72:

Temperature Supervision Characteristics

Temperature Supervision Characteristic: Shows the key electrical parameter of the over-temperature

supervision.

Temperature Supervision SD4 (sub die)

A similar supervision is installed for the power stage controlled

by SD4. temp_sd4_alarm and temp_sd4_shutdown are

indicating a >110°C or >140°C temperature condition of the sub

die. For both events an interrupt can be triggered. With

mask_ovtemp=0 reaching 140°C is initiating a reset cycle. If

mask_ovtemp=1 only an interrupt is generated (if enabled)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

T110

ov_temp_110 rising threshold

110

125

ºC

T140

ov_temp_140 rising threshold

125

140

155

ºC

Thyst

ov_temp_110 and

ov_temp_140 hysteresis

5ºC

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