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| 型號： | MAXQ1004-B01+ |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | RISC MICROCONTROLLER, QCC16 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, TQFN-16 |
| 文件頁數(shù)： | 6/18頁 |
| 文件大?。?/td> | 1247K |
| 代理商： | MAXQ1004-B01+ |
MAXQ1004
1-Wire and SPI Authentication Microcontroller
14
Slave Functionality
The 1-Wire slave provides three functions. The first is
that of a totally independent slave function, which can
be externally accessed at any time to verify its identity.
The 1-Wire front-end functions in an identical fashion to
that of the DS1990 serial ID to verify the serial ID number.
The bus master must provide one of the ROM function
commands:
Read ROM
Match ROM
Search ROM
Skip ROM
Overdrive-Skip ROM
Overdrive-Match ROM
Resume
The second function is that of a 1-Wire that includes full
bidirectional data flow and data flow control. The 1-Wire
functions that become accessible after a ROM function
command is successfully executed initiate communica-
tions with the microcontroller through the use of specific
1-Wire commands:
Read I/O Buffer
Write I/O Buffer
Read Command Buffer
Write Command Buffer
Read Command Buffer Extended
Write Command Buffer Extended
Status Register Read
Status Register Write
The third function controls the operation of the 1-Wire
interface:
1-Wire Micro Reset
And the remaining are 1-Wire run commands:
Start Program
Continue Program
Write Command Buffer Extended and Start Program
Write Command Buffer Extended and Continue Program
Operating Modes
The low-power mode of operation is stop mode. In this
mode, CPU state and memories are preserved, but the
CPU is not actively running. Wake-up sources include
external I/O interrupts, the power-fail warning interrupt,
a valid 1-Wire command received, or a power-fail reset.
Any time the microcontroller is in a state where code
does not need to be executed, the user software can
enter stop mode.
An even lower stop mode is the data-retention mode,
in which the CPU is not active. When the data-retention
mode option is invoked (DRET = 1) and the regula-
tor is disabled (REGEN = 0), only the first 512 bytes
of data memory is retained (data memory word offset
0000h–00FFh). CPU status and 1-Wire/AES memory are
powered down and contents are lost. A POR occurs
when exiting stop mode from data-retention mode. This
mode can be exited from any of the following enabled
interrupt sources:
Enabled external interrupts
External reset
Enabled PFW interrupt
Valid 1-Wire command received
Wake-up timer
The wake-up timer causes the device to exit stop mode
after a user-selectable time period. The power-fail moni-
tor is always on during normal operation. However, it can
be selectively disabled during stop mode using the pow-
er-fail monitor disable (PFD) bit in the PWCN register. By
default, the power-fail monitor function is enabled during
stop mode. If power-fail monitoring is disabled (PFD = 1)
during stop mode, the circuitry responsible for generat-
ing a power-fail warning or reset is shut down and neither
condition is detected. Thus, the VDD < VRST condition
does not invoke a reset state. However, in the event that
VDD falls below the POR level, a POR is generated. The
power-fail monitor is enabled prior to stop mode exit and
before code execution begins. If a power-fail warning
condition (VDD < VPFW) is then detected, the power-fail
interrupt flag is set on stop mode exit. If a power-fail con-
dition is detected (VDD < VRST), the CPU goes into reset.
The 1-Wire peripheral can operate in a special mode
that draws minimal power, yet can serve as a wake-
up source to bring the device out of stop mode. If the
1-Wire peripheral is required to run in stop mode, it can
be enabled so a regular 1-Wire reset pulse briefly wakes
up the 1-Wire controller. The 1-Wire controller then deter-
mines if it was addressed. If so, the 1-Wire controller
wakes up the CPU from stop mode. If the microcontroller
is not being addressed, then stop mode continues and
the 1-Wire controller is powered down again, and the
device returns to its lowest power state. The device does
not respond to an overdrive reset pulse in stop mode.
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相關代理商/技術參數(shù) |
參數(shù)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 處理器系列:MSP430FR572x 數(shù)據(jù)總線寬度:16 bit 最大時鐘頻率:24 MHz 程序存儲器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風格:SMD/SMT |
| MAXQ1004-KIT# | 功能描述:開發(fā)板和工具包 - 其他處理器 MAXQ1004 Eval Kit RoHS:否 制造商:Freescale Semiconductor 產(chǎn)品:Development Systems 工具用于評估:P3041 核心:e500mc 接口類型:I2C, SPI, USB 工作電源電壓: |
| MAXQ1010 | 制造商:MAXIM 制造商全稱: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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