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根据I2C总线功能问答集锦

问:如果热拔插I2C总线上的设备,是否易对总线及总线上的设备会产生严重影响,如何影响。情况1:拔插当时总线上的空闲设备;情况2:插拔当时

问:假如热拔插I2C总线上的设备,是否易对总线及总线上的设备会产生严重影响,怎样影响。状况1:拔插其时总线上的闲暇设备;状况2:插拔其时总线上的BUSY设备,MASTER或SLAVE。

[答:Alex] 1 支撑热插拔
2 假如声明支撑热插拔的I2C器材不会对总线产生任何的影响,器材刺进的时分它会主动的检测线路状况,并且只在总线闲暇的时分衔接器材,所以不会对总线产生任何的影响
[问:kkwd] I2C上拉电阻怎样承认
[答:Bruce] 这里有一个核算公式:
Rmin={Vdd(min)-o.4V}/3mA
Rmax=T/0.874.c, T=”1us” 100KHz, T=”0″.3us 400KHz
[问:applebig] I2C对热插拔是否支撑?有没有热插拔时数据传送正确性的维护方法?
[答:Timothy] Yes, Philips I2C devices support Hot swap functions, please refere to Philips website @ WWW.standardproducts.philips.com and search for PCA951X series for details

[问:zhongshan] 请介绍一下I2C总线的运用范畴和运用留意事项。
[答:Bruce] I2C总线是一个通用的串行总线,能够在许多范畴中运用,比方核算机制作、电信设备、消费类电子、手持设备等。运用中需求留意的首要有:总线容量、信号传输间隔 、总线频率、slave地址、上拉电阻阻值核算等
[问:jameswl] 请问,我在I2C总线的芯片中在寄存的数据会丢掉,怎样处理?
[答:Alex] 我想这是存储芯片的问题,和什么接口并无联络,除非你没有写进去,若你能承认数据现已写入,我主张你触摸你的芯片供货商恳求帮助测验处理该问题。
[问:mocan] 1、I2C是否支撑热拔插。

[问:khadgar02] 请问一家ic公司怎样取得i2c操控器的出产授权?交纳license?直接向philips购买硬核?能够自行研发然后通过测验吗?
[答:Timothy] Apply for a license or text of the Philips I2C Standard License Agreement please contact Mr. Hesselmann (I2C.Support at philips.com)

[问:kkwd] 怎样把GPIO口编程为I2C总线?
[答:Paul] PCA9564 can do this job, 8 GPIOs and several control signals transfer to I2C bus.

[问:abucaiwang] 咱们把I2C通过迷你USB接口从机器上引了出来,和其他的一台机器衔接。现在线长1米左右,速度是280Kbps能够正常传输。咱们想知道按这种速度能够不犯错传多远,假如间隔很长,中心是否需求加什么设备,你们是否有相应的处理方案。
[答:Lily] 假如选用USB 1.1能够传送25米,咱们有相应的芯片进行I2C 和USB间的转化。
[问:xiaoyudz] 我一向搞不清I2C总线和CAN总线它们的真实差异,期望专家能结合实例运用帮助彻底差异。首要深表感谢!!!
[答:Alex] CAN总线通过杂乱的传输协议能够完结很高容错功用,所以多用于对数据精确要求很高的场合,比方轿车,机械等范畴,可是其速度很低,协议杂乱。而I2C总线协议完结十分的简略,速度更高,可是没有供给如CAN那样杂乱的纠错和检测机制。所以归纳而言,CAN杂乱,可是容错度高,速度低。而I2C简略,高速,容错度相对低
[问:wookay] I2C总线的最高数据传输速度能到达多少?I2C接口应该是半双工的吧?
[答:Vincent] at this moment, our I2C product support max of 400Khz speed. It is half duplex.
[问:lbgy] 通过缓冲器能够扩展I2C总线传输间隔,答应选用多少级缓冲器?
[答:Alex] Philips许多的缓冲器能够级联,所以答应无限的缓冲器
[问:qinzhiwoo] I2C总线怎样于并行总线转化
2)I2C总线怎样辨认同种带有I2C接口的器材,并对他们读写
[答:Victor] 1. You can add a BUS SWITCH or MULTIPLEXER to switch the I2C bus.
2. each devive has its own device ID and I2C bus will confirm the ID before read and write
[问:carelisan] IIC总线与RS232,RS458有怎样的不同?
[答:Alex] 最首要的差异在于:
1 I2C首要用于体系内部,而RS485/232多用于外部设备的衔接
2 I2C从技术上说归于同步串行总线,RS485/232归于异步串行总线
3 I2C总线上不需求专门的收发器设备,所以简略,而RS485/232需求专门的电平转化器材
[问:lbgy] I2C总线的传输速度有多高?它的数据完好性和安全性怎样?
[答:Bruce] I2C总线理论上传输速度能够为100KHz(规范)、400KHz(快速)和3.4MHz(高速)。 现在还没有老练的3.4MHz速率的产品。 I2C总线是板内总线,总线内部有地址办理和裁定机制,在总线容量、slave地址等技术指标正确的状况下,数据的完好性和安全性是有确保的
[问:david_liao] SDA SCL 的pull up 电阻是否有特定的要求?
[答:Victor] the value is not fixed, so pls refer to application note for detail
[问:Cris Tsin] How to solve I2C address conflicts

[答:Paul] I2C protocol define each chip one unique slave address.So if you communicate to several identical ICs, I2C address should be different.
If not, the same address ICs will be replied at the same time.
[问:lljiang] 当i2c总线接多个slave设备时,能够直接衔接么?
[答:Alex] 我不是很清楚你的直接衔接是是指什么,但一切的slave设备都是并联在总线上,是直接衔接的
[问:huanggang] I2C 总线SDA信号双向阻隔完结电路?
[答:Alex] 我主张你运用咱们的P82B96器材,它能够完结SDA,SCL信号的双向阻隔
[问:henryxiang] 在我的运用中,是多个P82B715挂在一条I2C上,运转几个小时后,就会呈现数据线被拉低导致I2C死掉,请问是什么原因?其他,I2C假如要支撑热插拔,有必要满意什么条件?
[答:Paul] The distance of I2C bus was limited by capacitance, so you should pull higher voltage level or reduce the distance.

PCA9510~14 can support hot plug, please refer to the datasheet and AP note.
[问:LEOPAN] 各時序的門隔時間,及復位時要求的狀態怎样.
[答:Alex] 对不住,我不是很清楚你的问题,能否请你问的更清楚一些呢?I2C上的时序是由SCL的边缘驱动的,不动器材对复位有不同的要求,I2C总线上的复位实践便是指一次传输的完毕吧,这个能够参阅传输时序的
[问:zmdcg] 在i2c装备中受外界(比方电压安稳性、振荡等)的搅扰会产生什么影响?
[答:Victor] If I2C is effected by cross-talk, then the data might be wrong, that mean the function of device might be wrong.
[问:tianke999] 你好!
我想请问,假如运用音频紧缩的dsp芯片需求与arm的cpu相联,假如运用iic会不会呈现速度问题,运用hpi怎样?
[答:Alex] 我想这是由你需求的数据带宽承认的,你在体系规划的时分需求先核算你需求的最大的数据带宽(音频数据),这个考虑对不管任何接口或许总线都需求你自己承认的。现在I2C支撑的最大带宽为400kbps
[问:lbgy] I2C总线的数字信号的颤动功用的最低要求是什么?能给出它和传输间隔的联络吗?
[答:Bruce] I2C总线为同步总线,对颤动功用没有要求?
[问:zmyf] 请问高速I2C一般运用多少的波特率呢?咱们一般运用80K/100Kbits/S,有最优值吗?
[答:Alex] 高速I2C总线最高速率支撑3.4MHz,只需主总器材支撑,其下恣意速率都是能够的,并无最优值,咱们一般会运用较高的速率,可是在长间隔传输的时分,一般会考虑较低的速率
[问:zzkeng] I2C的速度不够高,假如处理?或是I2C的将来会向那个方向开展?有无或许开展新协议?
[答:Timothy] Since it is set for maintainace, so the speed is not requested as high as others! now the highest is 3.4Mhz.
[问:qihong] 请问lpc系列单片机的iic接口是否支撑热插拔?
[答:Alex] 不支撑,I2C总线上的热插拔需求专门的器材支撑,比方PCA9511
[问:chenhezhi] I2C总线在接连写EEPROM时简略呈现什么问题,100K的传输速率。
[答:Alex] 在我的经历中,好像没有发觉有任何问题
[问:david_liao] I2C的layout时,对线长、线宽、线距有没有要求?
[答:Timothy] Just remember the max C value on the bus is 400pf.
[问:applebig] PCA9512对正在运用状况的器材拔出时有什么维护吗?比方主发状况的期间拔出时,由谁来宣布stop信号
[答:Paul] We use ACC this signal to control the VCC2, when VCC1 = VCC2 I2C bus was connected. If not, disconnect this bus suddenly. I2C bus won”t communicate anymore.
[问:abucaiwang] I2C仅仅能够在板内传输吗,假如把它引到外面有什么要留意的?
[答:Victor] I2C can be used in PCB and also applied by cable, if by cable, the capacitance will be the factor to decide the cable length
[问:binelf] 请问I2C Master设备和Slave 设备各自完结的功用的相同点和不同点.
EEPRom归于I2C Slave设备吗?为什么许多IC的装备都是通过I2C总线直接与EEProm直接相连.

[答:Alex] 1 master主张传输并一向传输SCL信号,而slave被迫的接受总线上的信号,并根据接受到的SCL信号作为同步时钟
2 EEPROM是I2C slave设备,”许多I2C的装备“-我不是很了解你的意思,装备IC当然应该是与该IC相连
[问:dabao123] sda 线为什么需求一个 漏极开路的下拉电阻? 这个电阻是否一切IIC器材内部都现已集成?
[答:Bruce] 应该是有上拉电阻。通过将总线拉至低电平,漏极开路驱动,一切总线上设备都能够传送数据。 有的I2C器材内部现已集成了上拉电阻,如PCA9555等,有的则没有,请运用前查阅DATASHEET
[问:hezexue_mail] 请问I2C和smbus有何不同?
[答:Paul] Basically, these two bus are the same but the protocol and software definition have a bit different.
[问:margi] 怎样解決data loss.
[答:Alex] 只能通过软件检测并要求重发,硬件并无处理data loss的机制
[问:panther2000] 假如一个体系中有多个I2C设备要操控,而有些设备是时间敏感性的,请问这是否会影响体系呼应时间?
[答:Paul] Base on your frequency, the rising and falling time will be different. Please refer to I2C standard SPEC.
[问:dabao123] 请问 IIC总线通讯和串口通讯比较,哪个安稳性高?
[答:Alex] 我没发现有此类测验的比较,根据我的个人经历,I2C更安稳,可是由于I2C一般间隔较短,而串口一般连线较长,所以此类比较好像无意义
[问:abucaiwang] 请问:I2C能传多远?
[答:Timothy] Basically, Maximum bus capacitance = 400 pF (without repeaters) which is about 20 – 30 devices or 10 ft of wire
[问:KZXYA] 1.I2C总线的作业速度是否有下限?假如有,是多少?
2。I2C总线的2个上拉电阻怎样核算?
[答:Lily] 1。I2C总线的作业速度取决于主控器的功用,是有下限的,假如是待机形式速度为0。
2。I2C总线的2个上拉电阻取决于电源电压, 总线电容, 衔接器材的数量。电源电压决议了最小值,容线和上升时间决议了最大值。
[问:bellsleep] IIC总线是否会呈现锁死?假如呈现锁死,主设备怎样才干发觉总线毛病,以及扫除?
[答:Alex] 就总线自身而言,不会锁死,锁死一般是由于外部器材的失效和毛病形成,此刻主设备会接连收到总线busy的中止,若是slave器材毛病形成的,那么有必要移除或许通过I2C开关器材阻隔毛病器材
[问:my_zxj] I2C总线在外表主动化中的运用?
[答:Lily] 请明确是哪一类外表。
[问:binelf] 请问总线的Capacitive load 是什么意思?怎样判别总线上的Capacitive load超越400pF

[答:Alex] capacitive load是指总线的容性负载,这个能够通过相加总线上器材的作业容抗来得到,IC器材的容抗能够在datasheet上查到
[问:wyifan_99] 1.传送间隔最远是多少?
2.最快速度可达多少:
[答:Timothy] 1. Maximum bus capacitance = 400 pF (without repeaters) which is about 20 – 30 devices or 10 ft of wire
2. Std.= 100kHz, Fast=”400Khz”, and 3.4 Mhz for High speed
[问:jackstraw] 请问:怎样进步I2C的牢靠性、预防方法?从哪些方面处理数据丢掉的问题?
TKS
[答:Paul] 1.Increase I2C capacitance, pull higher voltage level and reduce distance.
2.Same frequency, less node and reduce data conflict.
[问:victayim] 是否有一种点评开发板,能将I2C总线的传输内容实时显现在核算机上。比方显现I2C总线上,HOST驱动了什么地址,回来或写入了什么值?
[答:Timothy] We have a evaluation kit called 2002-1A board, please contact our local sales for further details.
[问:linuxosa] 咱们运用IPMB(根据I2C 100KHz)来完结一块办理卡和BMC通讯,现在需求估量它的最大通讯才干,请问有什么方法?谢谢
[答:Alex] 你所谓的最大通讯才干我想是指带宽吧,那么你的最大带宽便是I2C速率100kbps除掉协议开支,大约是80K的姿态吧
[问:jim2004] 您好:
我想知道12C总线有多大的长处,和曩昔的比较,最杰出的长处是什么?
[答:Lily] 1。便利将框图变成原理图
2。在BUS上添加或去掉某器材不会影响到其它器材作业
3。多主机功用答应通过外部衔接到出产线,快速测验和调整最终用户的设备,毛病诊断和调试都很简略
4。软件调试简略,可调用运用软件包来缩短软件开发进程
5。一切I2C器材共用一条BUS可节约IC引脚资源,削减PCB板面积
6。通过答应简略地结构设备变量,坚持规划是最新的简易晋级功用添加了体系规划的灵活性

和曩昔的比较,是指什么?其他总线吗?
[问:phenix258] I2C是怎样差异不同的I2C器材的?一条I2C总线上最多能够接多少I2C器材,其功耗一般多大?
[答:Victor] 1. each device has its own device ID.
2. 400pF capacitance is for one I2C bus, around 20 to 30 devices, and power consumption depends on its device and PCB layouy.
[问:chenjingwei] I2C总线总不存在过失处理机制,一旦总线产生毛病,怎样处理?
[答:Bruce] 有两种方法:
1。Reset呈现问题的Slave(假如这个Slave有Reset管脚)
2。发动“康复序列”
康复序列流程为:
1。在SCL线发送9个时钟脉冲
2。由master坚持SDA线为高,直到Slave-Transmitter形式开释SDA履行ACK操作
3。在ACK操作时,坚持SDA线为高
4。在Master-Receiver和Slave-Transmitter形式都曩昔后,Master会发一个Stop指令彻底初始化总线
[问:panther2000] 支撑I2C总线的处理器是否能够通过某个寄存器来设置时钟线的频率?仍是通过软件来同步?
[答:Paul] No, I think it”s impossible. MCU share all of it”s resource to control including I2C and others.
[问:john_xjm] 有没有带实时呼应的I2C芯片
[答:Bruce] I2C便是实时同步的总线
[问:dangdang] I2C总线是否能够扩展功用?
[答:Victor] yes, you can add a Repeter to extend it, for more detail, visit our website or email : i2c.support@philips.com
[问:maeleton1] 在I2C总线上能否选用LVDS信号?有何长处?
[答:Alex] 我想是能够的,长处也是清楚明了的,比方能够传输更远的间隔,供给更高的数据安稳性等,可是完结起来会比较杂乱,首要你有必要将双向总线分隔,再接入LVDS驱动器材等,这样的话,I2C总想会变成8条线,失去了I2C简练易用的优势
[问:vvsvv] 怎样了解400pf的电容约束?怎样核算某i2c总线上详细现已有的电容数量是多少?
[答:Bruce] 400pf指的是I2C总线的容量,某一个I2C器材都有它的容值,一般为20pf左右,详细能够看它的Datasheet
[问:maeleton1] I2C总线上的器材假如有一个失效或有毛病,怎样处理或进行阻隔?
[答:Paul] Please refer to the presentation, about PCA9548.
[问:mountds] MASTER 的频率较高时比方20Mhz ,写入到I2C器材时有必要通过延时才干匹配I2C器材的速度吗?

[答:Lily] MASTER 是指I2C BUS中的MASTER吗?I2C BUS 频率最I2C器材高为3.4 Mbit/s 。写入到I2C器材器材时由MASTER 宣布对应I2C器材器材频率的时钟。
[问:zzkeng] 现在的MCU速度越来越快,怎样处理I2C总线和MCU的接口问题?
[答:Vincent] MCU with build in I2C only come with 2 speeds : 100Khz or 400Khz, hence MCU can still connect to the I2C product regardless of the speed of the MCU
[问:hdan] 对上拉电平有没特其他要求?
[答:Bruce] 详细电平接受才干要看详细芯片,现在Philips的I2C芯片一般都能够接受2.3V~5.5V。 再挑选适宜的上拉电阻,能够确保上拉电平值正确。
[问:qzwfeng] 在(一主多从),发现I2C从方法能够很牢靠的作业(定时器I正常,不会溢出),而主方法有时分会读不到数据(我设开始条件不满意或从器材没有呼应时提示),这时分再重新发动总线读一两次就正常了,此状况不是很经常呈现便是了,可是在要求特别高的总线上就不答应了,请问,我该留意哪些问题以防止有时读不到数据的状况,运用器材为P87LPC767/769.谢谢!
[答:Alex] 这个问题或许需求更详细的debug作业,由于I2C总线根本由硬件完结,所以在由I2C接口的器材上运用时一般不简略呈现问题,我主张你能够考虑I2C总线上的搅扰,并测验下降速率
[问:zmyf] I2C有几种读写形式?各有什么不同?
[答:Paul] I2C write: Start–Slave address(W)–Slave Acknowledge–data-stop
I2C read: Start–slave address(R)–Slave
Acknowledge–data-NON Acknowledge–stop
[问:luogongqiang] 通过那些方法能进步I2C总线的防搅扰才干?现在能到达那种水平?
[答:Alex] 假如你所说的搅扰是指电磁搅扰的话,在I2C规范约束条件下,减小上拉电阻是一个方法,考虑运用I2C总线驱动器进步输出驱动才干也是一个方法,至于切当的数据并无一个规范能够点评
[问:qzwfeng] 请问,当运用I2C作为一主多从方法通讯,在速率不是要求很高的状况下,总线能答应多长的线路(相似RS232通讯,1米或许能够更长),有什么特别的要求吗?归纳抗搅扰才干怎样?谢谢!
[答:Bruce] 在100KHz状况下,大约能够传输1m左右,假如要求更长间隔的传输,能够考虑加总线驱动芯片,如PCA9515A、P82B96等。
[问:panjianghong] 请问,那与其他总线比较有什么长处:是不是操控进步集成电路间数据传递速度?
[答:Lily] I2C总线与其他总线比较运用简略,调试便利,占用引脚资源少,并且十分通用,而数据传数速度与其它串行总线比较,不是最快的,最高频率为3.4 Mbit/s 。
[问:wyifan_99] 速度慢时是否可超越400nf约束
[答:Vincent] No
[问:Mike.G] 5V的IIC器材运用于3V的体系中,需求电平转化吗?能够这样用吗?
[答:Paul] Use repeater to separate this two differential level bus, like PCA9515 etc.
[问:eMartian] PCB板上多I2C器材互联时,是否有阻抗匹配问题?该怎样核算?
[答:Paul] Yes, please refer to I2C standard SPEC.
[问:glenli] 怎样运用I2C进行程序的烧录?
[答:Alex] 我想供给I2C烧录功用的单片机应该是供给完好的时序,指令和要求,这关于不同供给商的MCU纷歧定是相同的
[问:zhaoz] how to debug i2c device using HyperTerminal tool?
would you tell me a general method for debugging i2c device?
[答:Paul] Sorry, HyperTerminal is a program or ???
[问:jangyouhua] 在传输大批量数据时,I2C是否具有纠错功用?
[答:Alex] I2C硬件接口不具有数据检测和纠错的功用,你能够考虑在软件中完结
[问:luogongqiang] 怎样在I2C总线中参加光电阻隔器材?有无详细电路图?
[答:Bruce] 能够在P82B96等芯片后加光耦等器材
[问:aaron96031] 问:讨教I2C总线运用的范畴详细是哪些呢? 除了数据存储外,例如能够用来驱动外接IC来履行相应的动作吗?即扩展I/O口。现在是否有此类IC
[答:Paul] Yes, PCA9534/35 and PCA9554/55 are IO expender by
I2C bus.
[问:NANJING
LIUCHANG] 在用软件模仿IIC总线时要留意什么问题
[答:Timothy] We”d better suggest you to ue our I2C devices instead of bitbanging.
[问:songyzh] 请问I2C总线现在最高的数据传输速率是多少?
[答:Timothy] 3.4MHz
[问:LJM_BJ] I2C接口内部硬件是怎样的,是怎样完结多用户裁定的
[答:Bruce] I2C内部为漏极开路或集极开路。当2个或更多Master宣布Start指令时会呈现裁定问题,I2C芯片有主动裁定机制
[问:wood1] 请问PHILIPS现有的单片机,I/O接口 等芯片 ,有哪些IIC速度能够 >1MB的。

[答:Timothy] The I2C devices we have right now can support up to 400KHz,(which are the highest in the market) and for higher speed, we have the plan to do that in our roadmap.
[问:liguilin] 专家,您好!
1、iic总线设备被写入数据后,假如主控器不发送中止位给iic设备会呈现什么现象?
2、假如主控器不发送数据给iic设备,只给iic设备发送一个开始位然后再发一个中止位,iic设备将会呈现什么现象?
[答:Alex] 1 主器材不宣布中止位,那么此刻时钟怎样呢?还在走吗?根本从设备不会有特别的动作
2 这个成果很难说,由于这是I2C总线规范制止的动作,所以其反响或许会根据不同供给商的器材而不同,或许毫无反响最好 -:)
[问:luogongqiang] I2C总线的裁定进程一般需求多长时间?它由什么来决议?
[答:Paul] Basically, it”s only a byte time. I2C will accept
the signal triggering low first.
[问:vvsvv] SAA7111A有必要要预先用I2C接口编程吗?假如没有编程,SAA7111A的默许装备是什么?仍是一切的输出都是‘Z?谢谢
[答:Timothy] This is not in our discussion today, we will pass your questions to the handling group later.
[问:xystudio] I2C的線路上是否能够用不同的pull high電壓? 其master和slave內部是怎樣驅動的?
[答:Paul] Yes, all of I2C bus are open drain, but we suggest you to separate them.
[问:xfqian] 有的时分I2C在快速形式读写时会犯错,在低速形式读写时就没问题,该怎样处理。
[答:Alex] 这种问题并不罕见,或许是主从器材并不彻底的支撑最高速度,还有便是是否总线电容负载较大,是否布线过长等,调试中能够采纳的动作有限,能够测验改变上拉电阻的值
[问:robotone] 上拉电阻的巨细对数据的传输速度和间隔有什么影响吗?

[答:Bruce] 上拉电阻是由I2C芯片容许的反向电流和信号的上升时间T(由传输速率决议)
[问:luogongqiang] 怎样猜测总线的容性负载总量?它应包含那几方面的电容?
[答:Alex] 前面已有答复了
[问:小狮子] I2C总线运用了几位地址码,最多能支撑多少个设备?
[答:Alex] 两种规范,7位和10位,所以最多支撑1024个设备
[问:themis] 进行播送通讯时,我能够指定slave设备进行播送吗?是需求通过芯片进行设置,仍是直接通过编程就能够处理了。
[答:Alex] 播送通讯不答应指定slave
[问:betterpao] 你好,请问I2C总线和Maxim公司的1-wire总线有何不同?性价比怎样?
[答:Timothy] Maxim 1-wire supports only 3khz. Not recommand to compare with I2C bus
[问:chunsen] I2C的时钟同步的要求有多高?
[答:Bruce] I2C总线上假如有多个CLK,则总线时钟的Low由时间最长的Low CLK决议,High由时间最短的High CLK决议。
[问:robin622] 您好,我想了解一下,i2c总线在电视机中的运用及作业原理
[答:Paul] Generally, I2C extend the bus distance, increase I2C capacitance and increase GPIO and LED dimmer by I2C.

[问:hedaizhu] I2C是否只运用于体系内部,有无硬件或软件支撑与其它总线杰出交流。
[答:Victor] I2C can be applied by both layout on PCB and also extenal cable, but need to care the capacitance issue, for more detail, pls email to i2c.support@philips.com
[问:chunsen] 能否介绍I2C总线在数码彩电中的运用和长处?
[答:Paul] Using I2C, you can reduce the resource on your DSP and get more solutions to do you application, like keypad, signals controlling and communication.
[问:microftp] 能否介绍一下I2C总线通讯进程中容错处理
[答:Bruce] I2C总线上的Receiver接纳到每一条8位数据后都会发送一个Acknowledge码,以承认收到数据的正确。假如Transmitter没有收到这个承认码,则意味着发送数据犯错
[问:robotone] 该总线现在的竞争对手有那些?与竞争对手比较,优势安在?该总线在实时性很强的运用中是否会受到约束?
[答:Timothy] There always competitors in every applications, for I2C, we are at the leading position, and we provide most of the devices; and of course, we will keep moving on it with the leading customers to fulfill their need.
[问:hdan] 对I2C的上拉电平缓上拉电阻的取值不是很了解,可否介绍一下?谢谢
[答:Victor] to calculate the value of resistor, you should refer to application note, pls visit our website for more information or email to i2c.support@philips.com
[问:hanzhaoqin] 不同电压的I2C芯片要加不同的上拉电平,仍是加最高的上拉电压?
[答:Paul] I hope you can separate them. If not, please note these ICs tolerance voltage. In fact, it”s difficult to work on low voltage on high operating voltage IC.
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[问:wujue8088] 假如超越8个节点,怎样识辨
[答:Alex] 1 运用咱们的i2C mux/switch器材在不同时间阻隔
2 考虑运用带有更多地址位的器材
[问:applebig] 阻隔和,将SLAVE5复位后还能够持续在体系中运用吗?
[答:Alex] 对不住,请提出完好明晰的问题 -:)
[问:小狮子] I2C总线运用了几位地址码,最多能支撑多少个设备?
[答:Paul] Basically, 7 bits but we have 10 bits devices. Base on your equipment and PCB capacitance.
[问:liguilin] iic总线不作业时,是不是应该让总线为高阻状况?
谢谢!
[答:Paul] No need.
[问:david] 我的体系有三个单片机。运用I2C通讯。平常都处于接纳的状况,也便是被控。能行吗?这样任何一个发。其他的两个都能够收。没有主控。只要输出时才操控总线。变为输出。我不知道能不能完结。谢谢/。
[答:Victor] One MASTER must be exist in system to control the slave devices, if no Master in system, all the slave devices will not work.
[问:gaoying1982] i2c总线与普同的51单片机的txd与rxd比较,有什么不同,它的最大有长处是什么
[答:Vincent] MCU Txd and Rxd is the UART serial communcation output port and input port respectively. UART and I2C is a different serial communcation with different protocol and spec.
[问:Mike.G] 是否有IIC的接口IC,即能够设定为Master也能够Slave?
[答:Paul] No, I2C device should be defined be Master or Slave. So Slave device can”t be Master, but Master could be slave, like PCA9564 or other MCUs.
[问:chinesehuhong] 今后I2C总线将会加强哪些功用?或则说今后运用开展中,这个总线需求完善些什么?
[答:Timothy] I2Cbus is now the de facto standard serial bus for maintenance, control and configuration in most electronic platforms, so we will keep working with leading companies to enhance the functions, and it is all customer required.
[问:hyzjj_1981] I2C总线与DSP的结合,这方面的研究作业现况怎样?
[答:Timothy] I2C/SMBus is now the de facto standard serial bus for maintenance, control and configuration in most electronic platforms, so there are a lot of chip makers integrated I2C into their chip design, and so is Philips
[问:dabao123] IIC AD转化器的品种好象不是许多,您能给引荐几个吗?
[答:Paul] No, we have no the kind of IC in philips, but these parts will be designed in the future.
[问:bisojz] 我的I2C总线上存在100KHz和32KHz频率器材应怎样处理呢?
[答:Timothy] We will suggest you to split these items into different bus to keep the best operation mode
[问:zhanghm7522] I2C总线的时钟芯片,时钟禁绝怎样办?如PCF8563
[答:Paul] I will send this problem to the right person, it”s not my responsible part

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