ADUC7034BCPZ-RL Analog Devices Inc, ADUC7034BCPZ-RL Datasheet - Page 20

• 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

ADuC7034
THEORY OF OPERATION
The ADuC7034 is a complete system solution for battery
monitoring in 12 V automotive applications. This 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 dropout regula-
tor generates the supply voltage for two integrated 16-bit Σ-Δ
ADCs. The ADCs precisely measure battery current, voltage,
and temperature to characterize the state of health and state of
charge of the car battery.
A Flash/EE memory-based ARM7™ microcontroller (MCU)
is also integrated on chip. It is used both to preprocess the
acquired battery variables and to manage communication from the
ADuC7034 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 oper-
ating modes, the MCU can be totally powered down, waking
up only in response to an ADC conversion result being ready, a
digital comparator event, a wake-up timer event, a power-on
rest (POR) event, 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 mode and low power plus mode—that
generate conversion results to a lower performance specification.
On-chip factory firmware supports in-circuit Flash/EE repro-
gramming 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 ADuC7034.
The ADuC7034 operates directly from the 12 V battery supply
and is fully specified over a temperature range of −40°C to
+115°C. The ADuC7034 is functional but has 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
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 can
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be 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, called the Thumb
instruction set, which is compressed into 16 bits. Faster code
execution from 16-bit memory and greater code density can
be achieved by using the Thumb instruction set; therefore,
the ARM7TDMI core is particularly suited for embedded
applications.
However, the Thumb mode has three limitations:
•
•
•
Multiplier (M)
The ARM7TDMI instruction set includes an enhanced
multiplier with four extra instructions to perform 32-bit ×
32-bit multiplication with a 64-bit result, or 32-bit × 32-bit
multiplication-accumulation (MAC) with a 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 con-
trolled through the JTAG test port. When a breakpoint or
watchpoint is encountered, the processor halts and enters the
debug state. When in the debug state, the processor registers
can be interrogated, as can the Flash/EE, SRAM, and memory-
mapped registers.
Relative to ARM, the Thumb code usually requires more
instructions to perform a 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 instruct-
tions that are needed for exception handling; therefore,
ARM code may be required for exception handling.
When an interrupt occurs, the core vectors to the interrupt
location in memory and executes the code present at that
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