PCA9698 是56 腳的CMOS 器件,能夠?qū)崿F(xiàn)I2C/SMBUS 應(yīng)用中40 位通用GPIO 的擴(kuò)展。改進(jìn)的特性包括4000pF 的驅(qū)動(dòng)能力、5V I/O 口、工作電流低于1mA、單獨(dú)的I/O 口配置、400kHz I2C 總線時(shí)鐘頻率和更小的封裝形式。當(dāng)應(yīng)用中需要額外的I/O 口來連接ACPI(“高級(jí)配置與電源接口“這是英特爾、微軟和東芝共同開發(fā)的一種電源管理標(biāo)準(zhǔn))電源開關(guān)、傳感器、按鈕、LED、風(fēng)扇等時(shí),可使用 I/O 擴(kuò)展器件實(shí)現(xiàn)簡單的解決方案。
標(biāo)簽: 9698 PCA 應(yīng)用筆記
上傳時(shí)間: 2013-11-11
上傳用戶:gundamwzc
信號(hào)傳輸距離有限,常用于一個(gè)PCB板之內(nèi);總線上掛接的節(jié)點(diǎn)器件有限,受容性負(fù)載最大值400pF的限制;拓?fù)浣Y(jié)構(gòu)只能是二線總線型,不能擴(kuò)充到星型結(jié)構(gòu);速度只能取最低值,高速I2C器件速度發(fā)揮不出來;不同電平的器件不能掛接在同一總線上;如果要解決上述問題,一般方法是再增加一或多條I2C總線,為不同的總線編寫不同的程序,增加了工作量還降低了軟件的可移植性。
上傳時(shí)間: 2013-10-17
上傳用戶:Jesse_嘉偉
該器件可橋接SMBUS(350μA)、3.3V邏輯器件,15V電平及低阻抗導(dǎo)線可以延長通信距離,增加抗干擾能力。該器件對(duì)I2C總線協(xié)議和時(shí)鐘速率沒有特殊要求。P82B96能增加I2C總線節(jié)點(diǎn)上掛接的最小負(fù)載數(shù)、新總線負(fù)載數(shù)和遠(yuǎn)程I2C總線器件數(shù),且不會(huì)對(duì)本地節(jié)點(diǎn)造成影響。掛接器件數(shù)目和物理上的限制也會(huì)大大減小。通過平衡傳輸線(雙絞線)或光耦隔離(光纖)發(fā)送信號(hào),Tx、Rx結(jié)構(gòu)上的分隔使其發(fā)送變得簡單,且Tx和Rx信號(hào)直接相連時(shí)而不會(huì)鎖死。
標(biāo)簽: P82B96 I2C 通信 中的應(yīng)用
上傳時(shí)間: 2013-10-27
上傳用戶:sxdtlqqjl
PCA9515 是一款采用BiCMOS 工藝的總線中繼器,通過它可以擴(kuò)展I2C 和SMBUS 系統(tǒng)。PCA9515 在保持總線操作模式和特性的情況下,通過緩存數(shù)據(jù)線(SDA)和時(shí)鐘線(SCL)的數(shù)據(jù)實(shí)現(xiàn)I2C 總線擴(kuò)展,總線容性負(fù)載能力最大為400pF。
上傳時(shí)間: 2013-11-10
上傳用戶:asdgfsdfht
The PCA9516 is a BiCMOS integrated circuit intended forapplication in I2C and SMBUS systems.While retaining all the operating modes and features of the I2Csystem, it permits extension of the I2C-bus by buffering both the data(SDA) and the clock (SCL) lines, thus enabling five buses of 400 pF.The I2C-bus capacitance limit of 400 pF restricts the number ofdevices and bus length. Using the PCA9516 enables the systemdesigner to divide the bus into five segments off of a hub where anysegment to segment transition sees only one repeater delay.
標(biāo)簽: 5channel 9516 PCA I2C
上傳時(shí)間: 2013-11-21
上傳用戶:q123321
The PCA9535 and PCA9535C are 24-pin CMOS devices that provide 16 bits of GeneralPurpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBUS applications and wasdeveloped to enhance the NXP Semiconductors family of I2C-bus I/O expanders. Theimprovements include higher drive capability, 5 V I/O tolerance, lower supply current,individual I/O configuration, and smaller packaging. I/O expanders provide a simplesolution when additional I/O is needed for ACPI power switches, sensors, push buttons,LEDs, fans, etc.
上傳時(shí)間: 2013-10-21
上傳用戶:愛死愛死
PCA9516 是一款基于BICMOS 工藝的I2C/SMBUS 總線中繼器。PCA9516 保持I2C 總線系統(tǒng)所有的模式與特性的同時(shí),允許擴(kuò)展I2C/時(shí)鐘總線和連接5 條最大容限為400pF 電容的總線。當(dāng)I2C 總線上有400pF 的電容時(shí),總線長度和器件的數(shù)量都會(huì)被限制。系統(tǒng)設(shè)計(jì)者把總線分成五部分,各部分之間的傳輸只有一個(gè)復(fù)用器的延時(shí)。
上傳時(shí)間: 2013-11-13
上傳用戶:75119158
The PCA9517 is a CMOS integrated circuit that provides level shifting between lowvoltage (down to 0.9 V) and higher voltage (2.7 V to 5.5 V) I2C-bus or SMBUS applications.While retaining all the operating modes and features of the I2C-bus system during thelevel shifts, it also permits extension of the I2C-bus by providing bidirectional buffering forboth the data (SDA) and the clock (SCL) lines, thus enabling two buses of 400 pF. Usingthe PCA9517 enables the system designer to isolate two halves of a bus for both voltageand capacitance. The SDA and SCL pins are over voltage tolerant and arehigh-impedance when the PCA9517 is unpowered.
標(biāo)簽: translating Level 9517 PCA
上傳時(shí)間: 2013-12-25
上傳用戶:wsf950131
PCA9517 是一款基于CMOS 工藝的低電壓I2C 中繼器,在I2C 總線或SMBUS 應(yīng)用中進(jìn)行高低電壓轉(zhuǎn)換。PCA9517 能夠在電平轉(zhuǎn)換期間保持總線所有的操作模式和特性,通過數(shù)據(jù)線(SDA)和時(shí)鐘線(SCL)的雙向緩存實(shí)現(xiàn)I2C 總線擴(kuò)展,總線最大容性負(fù)載為400pF。PCA9517 能夠隔離器件總線兩端的電壓和容性負(fù)載。SDA 和SCL 引腳具有過壓保護(hù)功能,在掉電的情況下為高阻狀態(tài)。
上傳時(shí)間: 2013-10-08
上傳用戶:zgz317
The PCA9518 is a BiCMOS integrated circuit intended forapplication in I2C and SMBUS systems.While retaining all the operating modes and features of the I2Csystem, it permits extension of the I2C-bus by buffering both thedata (SDA) and the clock (SCL) lines, thus enabling virtuallyunlimited buses of 400 pF.
標(biāo)簽: Expandable 5channel 9518 PCA
上傳時(shí)間: 2013-10-23
上傳用戶:dumplin9
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