ADUC7034BCPZ-RL Analog Devices Inc, ADUC7034BCPZ-RL Datasheet - Page 103

• Manufacturer Part Number: ADUC7034BCPZ-RL
• Description: IC,Battery Management,LLCC,48PIN,PLASTIC
• Manufacturer: Analog Devices Inc
• Series: MicroConverter® ADuC7xxxr

Specifications of ADUC7034BCPZ-RL

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 20.48MHz
• Connectivity: LIN, SPI, UART/USART
• Peripherals: POR, PSM, Temp Sensor, WDT
• Number Of I /o: 9
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 3.5 V ~ 18 V
• Data Converters: A/D 2x16b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 115°C
• Package / Case: 48-LFCSP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

HANDLING INTERRUPTS FROM THE HIGH
VOLTAGE PERIPHERAL CONTROL INTERFACE
An interrupt controller is integrated in the high voltage circuits.
If the interrupt controller is enabled through IRQEN[16], one
of six high voltage sources can assert the high voltage interrupt
(IRQ3) signal and interrupt the MCU core.
Although the normal MCU response to this interrupt event is
to vector to the IRQ or FIQ 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 that a transfer is in progress and then is cleared after
10 μs to indicate that the HVSTA contents are available in HVDAT.
The interrupt handler, therefore, can poll the busy bit in HVCON
until it deasserts. After the busy bit is cleared, HVCON[1] must
be checked to ensure that the data was read correctly. Next, the
Table 77. High Voltage Diagnostics
High
Voltage Pin
LIN or STI
WU
Fault Condition
Short between LIN or
STI and VBAT
Short between LIN or
STI and GND
Short between WU
and VBAT
Short between WU
and GND
Open circuit
Method
Drive LIN or STI low
Drive LIN or STI high
Drive WU low
Drive WU high
Enable OC diagnostic resistor
with WU disabled
Rev. B | Page 103 of 136
HVDAT register can be read. At this time, HVDAT holds 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 can be taken.
LOW VOLTAGE FLAG (LVF)
The ADuC7034 features a low voltage flag (LVF) that allows the
user to monitor REG_DVDD. When enabled via HVCFG0[2],
the low voltage flag can be monitored through HVMON[3]. If
REG_DVDD drops below 2.1 V, HVMON[3] is cleared and the
RAM contents are corrupted. After the low voltage flag is
enabled, it is only reset by REG_DVDD dropping below 2.1 V
or by disabling the LVF functionality using HVCFG0[2].
HIGH VOLTAGE DIAGNOSTICS
It is possible to diagnose fault conditions on the WU, LIN, or
STI pin, as described in Table 77.
Result
LIN or STI short-circuit interrupt is generated after 20 μs if
more than 100 mA is continuously drawn.
LIN or STI readback is low.
Readback high in HVMON[7].
WU short-circuit interrupt is generated after 400 μs if more
than 100 mA typically is sourced.
HVMON[7] is cleared if the load is connected and set if WU is
open-circuited.
ADuC7034