MC9S12DG128 的封装有两种，一种为80 引角的，它没有引出扩展总线，且AD 转换只引出了8 路；一种为112 引角的，两种都采用了表面贴片式封装.
上传时间： 2013-10-26
上传用户：adada
特性及优点• 内嵌FLASH和CAN的低成本器件– S12系列的低端产品– 16-位的性能8-位的价格• 引脚/封装– 48/52 LQFP– 80 QFP, 与B&D 系列引脚兼容– Flash从16K-128K,易于产品升级• 8通道10位AD– 7μsec, 10-bit 单次转换时间, 具有扫描模式
上传时间： 2013-10-28
上传用户：小宝爱考拉
PHILIPS 的P89LPC900 系列FLASH 单片机部分型号提供了8 位精度的AD 转换器，为许多控制系统带来方便，诸如温度控制、运动控制等，在MCU 发出控制指令后，常常需要将执行机构的情况反馈给MCU，从而构成一个闭环系统，达到精细控制的目的。这一检测过程一般由各种传感器完成，在某些对成本有高要求的场合，为了控制成本，也常使用一些简单的分立元件替代数字传感器，通常送到MCU 接口的都是一些经过处理的电压信号，内带ADC 的芯片能够简化设计，并使成本进一步降低。一般来说，8 位的AD 精度已经足以应对，但是在一些对精度要求比较高的场合，可能会需要10 位或者更高精度，细心的用户通过仔细研究P89LPC900 单片机的特点，发现P89LPC900 系列单片机ADC 的特点非常适合进行ADC 过采样，本文正是结合P89LPC900 的特点，介绍该单片机在高精度模数转换场合的应用，以及使用过采样技术需要满足的条件和需注意事项。使这种低成本高精度的AD技术得以应用。
上传时间： 2013-10-11
上传用户：gokk
<Almost since the introduction of microcontrollers as electronic components there always has been an oscillatorcircuit on the device to make it work. From application point of view only some external components wererequired to make it work. However, to make sure that it will always work required more effort. This report is basedon feedback from the market from customers applying 8-bit mircrocontrollers.>
标签： oscillators X-tal bit mic
上传时间： 2013-11-12
上传用户：穿着衣服的大卫
The PCA9670 provides general purpose remote I/O expansion for most microcontrollerfamilies via the two-line bidirectional bus (I2C-bus) and is a part of the Fast-mode Plusfamily.The PCA9670 is a drop-in upgrade for the PCF8574 providing higher Fast-mode Plus(Fm+) I2C-bus speeds (1 MHz versus 400 kHz) so that the output can support PWMdimming of LEDs, higher I2C-bus drive (30 mA versus 3 mA) so that many more devicescan be on the bus without the need for bus buffers, higher total package sink capacity(200 mA versus 100 mA) that supports having all 25 mA LEDs on at the same time andmore device addresses (64 versus 8) are available to allow many more devices on the buswithout address conflicts.
上传时间： 2013-10-15
上传用户：stella2015
The PCA9672 provides general purpose remote I/O expansion for most microcontrollerfamilies via the two-line bidirectional bus (I2C-bus) and is a part of the Fast-mode Plusfamily.The PCA9672 is a drop-in upgrade for the PCF8574 providing higher Fast-mode Plus(Fm+) I2C-bus speeds (1 MHz versus 400 kHz) so that the output can support PWMdimming of LEDs, higher I2C-bus drive (30 mA versus 3 mA) so that many more devicescan be on the bus without the need for bus buffers, higher total package sink capacity(200 mA versus 100 mA) that supports having all LEDs on at the same time and moredevice addresses (16 versus 8) are available to allow many more devices on the buswithout address conflicts.
上传时间： 2013-10-23
上传用户：jasonheung
The PCA9674/74A is a drop-in upgrade for the PCF8574/74A providing higher Fast-modePlus I2C-bus speeds (1 MHz versus 400 kHz) so that the output can support PWMdimming of LEDs, higher I2C-bus drive (30 mA versus 3 mA) so that many more devicescan be on the bus without the need for bus buffers, higher total package sink capacity(200 mA versus 100 mA) that supports having all LEDs on at the same time and moredevice addresses (64 versus 8) are available to allow many more devices on the buswithout address conflicts.
上传时间： 2013-10-22
上传用户：wwwwwen5
The PCA9557 is a silicon CMOS circuit which provides parallel input/output expansion for SMBus and I2C-bus applications. The PCA9557 consists of an 8-bit input port register, 8-bit output port register, and an I2C-bus/SMBus interface. It has low current consumption and a high-impedance open-drain output pin, IO0. The system master can enable the PCA9557’s I/O as either input or output by writing to the configuration register. The system master can also invert the PCA9557 inputs by writing to the active HIGH polarity inversion register. Finally, the system master can reset the PCA9557 in the event of a time-out by asserting a LOW in the reset input. The power-on reset puts the registers in their default state and initializes the I2C-bus/SMBus state machine. The RESET pin causes the same reset/initialization to occur without de-powering the part.
上传时间： 2014-01-18
上传用户：bs2005
RSM-4055 是带隔离的数字量输入输出模块。模块有8 路隔离数字量输入，8 路隔离数字量输出。数字量输入可支持开关触点信号或电平信号，数字量输出采用开漏输出，最大负载可达50V，50mA，同时模块的DI 通道还具有计数功能，能对小于2kHz 的数字脉冲信号进行计数，DI 输入检测和计数都具有数字滤波功能能有效滤掉干扰信号，数字输入检测和计数可同时使用。模块适用于采集工业现场的数字量信号以及控制功率继电器等。
上传时间： 2013-11-10
上传用户：zl520l
Although Stellaris microcontrollers have generous internal SRAM capabilities, certain applicationsmay have data storage requirements that exceed the 8 KB limit of the Stellaris LM3S8xx seriesdevices. Since microcontrollers do not have an external parallel data-bus, serial memory optionsmust be considered. Until recently, the ubiquitous serial EEPROM/flash device was the only serialmemory solution. The major limitations of EEPROM and flash technology are slow write speed, slowerase times, and limited write/erase endurance.Recently, serial SRAM devices have become available as a solution for high-speed dataapplications. The N256S08xxHDA series of devices, from AMI Semiconductor, offer 32 K x 8 bits oflow-power data storage, a fast Serial Peripheral Interface (SPI) serial bus, and unlimited write cycles.The parts are available in 8-pin SOIC and compact TSSOP packages.
上传时间： 2013-10-14
上传用户：cxl274287265
