AN3077 datasheet(9/82 Pages) STMICROELECTRONICS

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AN3077

General information

2.1

Mission profile

The assumed mission profile is:

●

Lifetime: 20 years

●

Total operating hours: 12000 hours

●

Trip time: 10 hours (Trip time is defined as the maximum time of operation of the MCU

without power-on reset)

●

Fault Tolerant Time Interval (FTTI, also named Process Safety Time (PST)): 10 ms

(maximum time between the first faulty output and a failure indication or reset)

Temperature profiles for packaged devices (Table 1) and bare die (Table 2) are shown

below.

Note:

The temperature profile is an assumption of the Device_Number safety analysis and shall

be fulfilled during integration into an ASIL D compliant system.

2.2

Safe state

By definition, the Safe states of the Device_Number are as follows:

●

Completely unpowered

●

Reset

–

All pins except possibly the error output pins (FCCU_F[0:1]) are tristated.

●

Operating correctly

–

Outputs depend on application.

●

Explicitly indicating an internal error

–

Error output pins FCCU_F[0:1] are in a state indicating an error, and the state of

other I/O pins will not be reliable.

Table 1. Temperature profile for packaged device

Temperature range (°C)

Operation time (h)

125–135

120

110–120

960

90–100

7680

30–40

3240

Table 2. Temperature profile for bare die device

Temperature range (°C)

Operation time (h)

120–125

120

100–110

960

80–90

7680

20–30

3240

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