參數(shù)資料
型號: ADUC7034BCPZ-RL
廠商: Analog Devices Inc
文件頁數(shù): 50/136頁
文件大?。?/td> 0K
描述: IC MCU FLASH 32K ANLG IO 48LFCSP
標準包裝: 2,500
系列: MicroConverter® ADuC7xxx
核心處理器: ARM7
芯體尺寸: 16/32-位
速度: 20.48MHz
連通性: LIN,SPI,UART/USART
外圍設(shè)備: POR,PSM,溫度傳感器,WDT
輸入/輸出數(shù): 9
程序存儲器容量: 32KB(16K x 16)
程序存儲器類型: 閃存
RAM 容量: 1K x 32
電壓 - 電源 (Vcc/Vdd): 3.5 V ~ 18 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 2x16b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 115°C
封裝/外殼: 48-VFQFN 裸露焊盤,CSP
包裝: 帶卷 (TR)
ADuC7034
Rev. B | Page 20 of 136
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
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
Description
T
Support for the Thumb (16-bit) instruction set
D
Support for debug
M
Enhanced multiplier
I
Includes the EmbeddedICE module to support
embedded system debugging
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:
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.
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.
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