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FAULT CONDITIONS AND SELFTEST PROCEDURES
The fault conditions below may be detected by the software:
• EEPROM data error;
• I2C internal bus failure;
• code dead loop.
EEPROM data error can be detected through EEPROM
test procedure at startup or when explicitly requested using
setup menu.
When an EEPROM error is detected, user is given the op-
tion to perform a reset of EEPROM. Thus the reset can be
performed whenever needed. It may be useful to provide a
means to reset EEPROM directly (without a previous EEPROM
error detection). This is done by pressing CFM first and then
SETUP,
and CAL DATA simultaneously.
Note
When an EEPROM reset has been
performed calibration data are reset
to default. An intermittent CAL will
blink on the display to advise the user
of this status.
A I2C failure is detected when the I2C transmission is not
acknowledged or a bus fault occurs for more than a certain
number of attempts (this can be due, for example, to damage
sustained by one of the ICs connected to I2C bus).
If so, the controller stops any tasks and displays a perpetual
sliding message “Serial bus error” (i.e. this is a fatal error).
