aduc7030 Analog Devices, Inc., aduc7030 Datasheet - Page 22

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

ADuC7030/ADuC7033
THEORY OF OPERATION
The ADuC7030/ADuC7033 are each a complete system
solution for battery monitoring in 12 V automotive applica-
tions. The device integrates all of the required features to
precisely and intelligently monitor, process, and diagnose 12 V
battery parameters including battery current, voltage, and
temperature over a wide range of operating conditions.
Minimizing external system components, the device is powered
directly from the 12 V battery. An on-chip, low drop-out
regulator generates the supply voltage for three integrated 16-bit
Σ-Δ ADCs. The ADCs precisely measure battery current,
voltage, and temperature to characterize the car battery’s state of
health and charge.
A Flash/EE memory-based ARM7® microcontroller (MCU) is
also integrated on-chip and is used both to pre-process the
acquired battery variables, and to manage communications
from the ADuC7030/ADuC7033 to the main electronic control
unit (ECU) via a local interconnect network (LIN) interface that
is integrated on-chip.
Both the MCU and the ADC subsystem can be individually
configured to operate in normal or flexible power saving modes
of operation.
In its normal operating mode, the MCU is clocked indirectly
from an on-chip oscillator via the phase locked loop (PLL) at a
maximum clock rate of 20.48 MHz. In its power saving
operating modes, the MCU can be totally powered down,
waking up only in response to an ADC conversion result ready,
digital comparators, the wake-up timer, a POR, or an external
serial communication event.
The ADC can be configured to operate in a normal (full power)
mode of operation, interrupting the MCU after various sample
conversion events. The current channel features two low power
modes, low power and low power plus, generating conversion
results to a lower performance specification.
On-chip factory firmware supports in-circuit Flash/EE
reprogramming via the LIN or JTAG serial interface ports, and
nonintrusive emulation is also supported via the JTAG
interface. These features are incorporated into a low-cost
QuickStart™ Development System supporting the
ADuC7030/ADuC7033.
The ADuC7030/ADuC7033 operate directly from the 12 V
battery supply and are fully specified over a temperature range
of −40°C to +115°C. The ADuC7030/ADuC7033 are functional,
but with degraded performance, at temperatures from 115°C to
125°C.
OVERVIEW OF THE ARM7TDMI CORE
The ARM7 core is a 32-bit reduced instruction set computer
(RISC), developed by ARM Ltd. The ARM7TDMI is a Von
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Neumann-based architecture, meaning that it uses a single
32-bit bus for instruction and data. The length of the data can
be 8, 16 or 32 bits and the length of the instruction word is
either 16 bits or 32 bits, depending on the mode in which the
core is operating.
The ARM7TDMI is an ARM7 core with four additional features
as listed in Table 8.
Table 8. ARM7TDMI
Feature
T
D
M
I
Thumb Mode (T)
An ARM instruction is 32 bits long. The ARM7TDMI
processor supports a second instruction set compressed into
16 bits, the thumb instruction set. Faster code execution from
16-bit memory and greater code density can be achieved by
using the thumb instruction set, which makes the ARM7TDMI
core particularly suited for embedded applications.
However, the thumb mode has three limitations:
x
x
x
Multiplier (M)
The ARM7TDMI instruction set includes an enhanced
multiplier, with four extra instructions to perform 32-bit by
32-bit multiplication with 64-bit result, and 32-bit by 32-bit
multiplication-accumulation (MAC) with 64-bit result.
EmbeddedICE (I)
The EmbeddedICE module provides integrated on-chip debug
support for the ARM7TDMI. The EmbeddedICE module
contains the breakpoint and watchpoint registers that allow
nonintrusive user code debugging. These registers are
controlled through the JTAG test port. When a breakpoint or
watchpoint is encountered, the processor halts and enters debug
state. Once in a debug state, the processor registers can be
interrogated, as well as the Flash/EE, the SRAM, and the
memory mapped registers.
Relative to ARM, the thumb code usually requires more
instructions to perform that same task. Therefore, ARM
code is best for maximizing the performance of time-
critical code in most applications.
The thumb instruction set does not include some
instructions that are needed for exception handling, so
ARM code can be required for exception handling.
When an interrupt occurs, the core vectors to the interrupt
location in memory and executes the code present at this
address. The first command is required to be in ARM code.
Description
Support for the thumb (16-bit) instruction set
Support for debug
Enhanced multiplier
Includes the EmbeddedICE module to support
embedded system debugging
Preliminary Technical Data