aduc7032 Analog Devices, Inc., aduc7032 Datasheet - Page 105

• Manufacturer Part Number: aduc7032
• Description: Microconverter Integrated, Precision Battery Sensor
• Manufacturer: Analog Devices, Inc.

Preliminary Technical Data
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 5 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
LOW VOLTAGE FLAG ( LVF )
The ADuC7032 features a Low Voltage flag, 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
HIGH VOLTAGE DIAGNOSTICS
It is possible to diagnosis fault conditions on the Wake and LIN bus as follows.
High Voltage Pin
Wake
LIN
Short Between Wake
Short Between Wake
Fault Condition
Short Between LIN
Short Between LIN
Open Circuit
and VBat
and GND
and VBat
and GND
Table 68: High Voltage Diagnostics
Resistor with Wake disabled.
Rev. PrD | Page 105 of 128
Enable OC Diagnostic
Drive Wake High
Drive Wake Low
Drive LIN High
Drive LIN Low
Method
and will be cleared after 10usecs 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 and then read the HVDAT register
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.
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].
LIN Short Circuit interrupt will be generated after 20uS if
HVMON[7] will be cleared if load is connected
Wake Short Circuit interrupt will be generated
after 400us if more than 200mA is sourced
more than 100mA is drawn continuously.
and set if wake is open circuited
LIN Read back reads back low.
Read Back high
Result
ADuC7032