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参数资料
| 型号： | MAXQ1004-B01+ |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | RISC MICROCONTROLLER, QCC16 |
| 封装： | 4 X 4 MM, ROHS COMPLIANT, TQFN-16 |
| 文件页数： | 7/18页 |
| 文件大小： | 1247K |
| 代理商： | MAXQ1004-B01+ |
MAXQ1004
1-Wire and SPI Authentication Microcontroller
15
In-Circuit Debug
Embedded debugging capability is available through
the JTAG-compatible test access port (TAP). Embedded
debug hardware and embedded ROM firmware provide
in-circuit debugging capability to the user application,
eliminating the need for an expensive in-circuit emulator.
See Figure 2. The in-circuit debug features include the
following:
Hardware debug engine
Set of debug service routines stored in the utility ROM
The embedded hardware debug engine is an indepen-
dent hardware block in the microcontroller. The debug
engine can monitor internal activities and interact with
selected internal registers while the CPU is executing
user code. Collectively, the hardware and software fea-
tures allow two basic modes of in-circuit debugging:
Background mode allows the host to configure and set
up the in-circuit debugger while the CPU continues to
execute the application software at full speed. Debug
mode can be invoked from background mode.
Debug mode allows the debug engine to take control
of the CPU, providing read/write access to internal
registers and memory and single-step trace operation.
Applications Information
Grounds and Bypassing
Careful PCB layout significantly minimizes crosstalk
among the high-speed external address/data bus sig-
nals and with digital I/O that could cause improper
operation. The use of multilayer boards is essential to
allow the use of dedicated power planes. Bypass VDD
on each microcontroller with a 0.1FF capacitor located
as close as possible to the pin.
Design Guidelines for ESD Protection
CMOS design guidelines for any semiconductor require
that no pin be taken above VDD or below ground.
Violation of this guideline can result in a hard failure
(damage to the silicon inside the device) or a soft failure
(unintentional modification of memory contents). Voltage
spikes above or below the device’s absolute maximum
ratings can cause a temporary brownout of the internal
power rail, possibly corrupting memory.
Microcontrollers commonly experience negative volt-
age spikes through either their power pins or general-
purpose I/O pins. Negative voltage spikes on power pins
are especially problematic as they directly couple to the
internal power buses. Devices such as keypads can
conduct electrostatic discharges directly into the micro-
controller and seriously damage the device. System
designers must protect components against these tran-
sients that can corrupt system memory.
In a practical application, it is difficult to remove all volt-
ages above VDD or below ground. Undershoots of 0.3V
can be tolerated by the microcontroller, and 5V tolerant
pins can accept up to 5.5V. Figure 3 demonstrates a
diode protection scheme that can be used to protect the
I/O pins of a microcontroller. The scheme relies on the
use of a Schottky diode and current limiting resistor to
reduce the effect of current spikes on the device. When
the voltage approaching the device pin exceeds VDD
or GND by more than 0.1V to 0.2V, the Schottky diodes
become forward biased, conducting the excess voltage
away from the device pins. The current limiting resistors
also help dampen the effect of the voltage spike on the
microcontroller.
Figure 2. In-Circuit Debugger
TAP
CONTROLLER
CPU
DEBUG
ENGINE
DEBUG
SERVICE
ROUTINES
(UTILITY ROM)
CONTROL
BREAKPOINT
ADDRESS
DATA
MAXQ1004
TMS
TCK
TDI
TDO
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAXQ1004-B01+ | 功能描述:16位微控制器 - MCU 1-Wire and SPI Authentication MCU RoHS:否 制造商:Texas Instruments 核心:RISC 处理器系列:MSP430FR572x 数据总线宽度:16 bit 最大时钟频率:24 MHz 程序存储器大小:8 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:VQFN-40 安装风格:SMD/SMT |
| MAXQ1004-KIT# | 功能描述:开发板和工具包 - 其他处理器 MAXQ1004 Eval Kit RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压: |
| MAXQ1010 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Security Token Microcontroller with RTC and USB |
| MAXQ1010-A01+ | 制造商:Maxim Integrated Products 功能描述:MAXQ1010 PSWD GEN MICRO 48 TQFN - Rail/Tube |
| MAXQ1010-DNS+ | 制造商:Maxim Integrated Products 功能描述:MAXQ1010 PSWD GEN MICRO DIE WAFFLE - Gel-pak, waffle pack, wafer, diced wafer on film |
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