ST10F276Z5 datasheet(228/239 Pages) STMICROELECTRONICS

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Known limitations

ST10F276Z5

228/239

Known limitations

This section describes the functional and electrical limitations identified on the CEG silicon

revision of the ST10F276Z5.

The major revision of the device is contained in the device identification register, IDCHIP,

located at address F07Ch. For Cxx versions, IDCHIP is set to 1143h.

24.1

Functional limitations

The function limitations identified on the ST10F276Z5 are the following:

●

Injected conversion stalling the A/D converter (see Section 24.1.1: Injected conversion

stalling the A/D converter)

●

Concurrent transmission requests in DAR mode (C-CAN module) (see Section 24.1.2:

Concurrent transmission requests in DAR-mode (C-CAN module))

●

Disabling transmission requests (see Section 24.1.3: Disabling the transmission

requests (C-CAN module))

●

Spurious BREQ pulse in slave mode during external bus arbitration phase (see

Section 24.1.4: Spurious BREQ pulse in slave mode during external bus arbitration

phase)

●

Executing PWRDN instructions (see Section 24.1.5: Executing PWRDN instructions)

●

Behavior of capture/compare (CAPCOM) outputs in COMPARE mode 3 (see

Section 24.1.6: Behavior of CAPCOM outputs in COMPARE mode 3)

24.1.1

Injected conversion stalling the A/D converter

Description

The A/D converter is stalled and no further conversions are performed when a new injection

request is issued before the CPU reads the ADDAT2 register (that is when the CPU has not

read the result of the previous injection request).

Workarounds and recovery actions

The following actions allow to unlock the A/D converter:

Read the ADDAT2 register twice at the end of every injected conversion. This action

also prevents the ADC from being stalled.

Disable and then enable again the wait for read mode.

Application conditions

This problem occurs if all the following conditions are fulfilled:

●

Injection requests are hardware triggered (via CapCom CC31).

●

The results of injected conversions are read by performing a PEC transfer. This

prevents from reading twice the ADDAT2 register by software.

●

A high level task is disabling the PEC transfer for a long time (time needed for 2 analog

conversions plus time between 2 injection requests).

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