aduc7030 Analog Devices, Inc., aduc7030 Datasheet - Page 116

• Manufacturer Part Number: aduc7030
• Description: Integrated Precision Battery Sensor For Automotive
• Manufacturer: Analog Devices, Inc.

ADuC7030/ADuC7033
HANDLING INTERRUPTS FROM THE HIGH
VOLTAGE PERIPHERAL CONTROL INTERFACE
An interrupt controller is also integrated with the high voltage
circuits. If enabled via IRQEN[16], one of 6 high voltage
sources can assert the high voltage interrupt (IRQ3) signal and
interrupt the MCU core.
While the MCU response to this interrupt event is, as normal,
to vector to the IRQ or FIQ interrupt vector address. The high
voltage interrupt controller simultaneously and automatically
loads the current value of the high voltage Status register
(HVSTA) into the HVDAT register. During this time the BUSY
bit in HVCON[0] is set to indicate the transfer is in progress
and will be cleared after 10µsecs to indicate the HVSTA
contents are now available in HVDAT.
The interrupt handler can therefore poll the busy bit in
HVCON until it de-asserts. Once the busy bit is cleared,
HVCON[1] must be checked to ensure the data was read
Table 72. High Voltage Diagnostics
High
Voltage Pin
LIN/STI
Wake
Fault Condition
Short Between
LIN/STI and VBAT
Short Between
LIN/STI and GND
Short Between Wake
and VBAT
Short Between Wake
and GND
Open Circuit
Method
Drive LIN Low
Drive LIN High
Drive Wake Low
Drive Wake High
Enable OC Diagnostic Resistor
with Wake disabled.
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correctly. Then the HVDAT register can be read. At this time
HVDAT will then hold the value of the HVSTA register. The
status flags can then be interrogated to determine the exact
source of the high voltage interrupt and the appropriate action
taken.
LOW VOLTAGE FLAG (LVF)
The ADuC7030 features a Low Voltage Flag (LVF), which when
enabled allows the user to monitor REG_DVDD. When enabled
via HVCFG0[2], the Low Voltage Flag may be monitored via
HVMON[3]. If REG_DVDD drops below 2.1V, then
HVMON[3] is cleared. If REG_DVDD drops below 2.1V the
RAM contents are corrupted. Once the Low Voltage Flag is
enabled, it is only reset by REG_DVDD dropping below 2.1V or
the disabling of the LVF functionality via HVCFG0[2].
HIGH VOLTAGE DIAGNOSTICS
It is possible to diagnosis fault conditions on the Wake, LIN and
STI bus as follows.
Result
LIN/STI Short Circuit interrupt will be generated after 20µS if
more than 100mA is drawn continuously.
LIN/STI Read back reads back low.
Read Back high in HVMON[7]
Wake Short Circuit interrupt will be generated after 400us if
more than 100mA typically is sourced
HVMON[7] will be cleared if load is connected and set if wake
is open circuited
Preliminary Technical Data