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[v1-03] 2015-Aug-10

AS3715 − Detailed Description – System Functions

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)

Watchdog

Description

The purpose of the watchdog is to detect a deadlock of the

software. If the watchdog is active, it must receive a continuous

trigger signal within a programmable time window. If there is

no signal anymore for a certain time period from a defined pad

or special serial interface bit, it starts either a complete reset

cycle or initiates the power OFF sequence.

The watchdog is highly configurable by the following register

bits:

• The complete block can be switched ON by wtdg_on = 1

and OFF by wtdg_on = 0.

• The watchdog time window is defined by the register

wtdg_timer between 1s and 128s.

• The trigger signal can be either triggered by setting

wtdg_sw_sig or using a HW signal on one of the GPIO pins

(gpioX_iosf=9).

• If the watchdog expires, the system can start

automatically a reset cycle if wtdg_reset_on = 1 and

wtdg_pweroff = 0, or perform a power down if

wtdg_reset_on = 1 and wtdg_pweroff = 1.

• If wtdg_reset_on = 0 and wtdg_pweroff = 0 only an

interrupt is generated (if the interrupt is enabled)

• Whether the watchdog caused a reset can be seen in the

reset_reason.

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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