Texas Instruments Incorporated I2C Bus Pullup Resistor Calculation 3 Speed Versus Power Trade-off www.ti.com 3 Speed Versus Power Trade-off Once the minimum and maximum value of the pullup resistor has been selected, the decision for the value of resistor can be made based on trade-off betwe...
Pull up resistor sizing As mentioned earlier, I2C use mosfet to pull LOW, and pull up resistor to pull HIGH. Normally mosfet is integrated into chips so cannot modify, so there are 2 things need to consider in the design. Pull up voltage. Every device in one bus need to use same volta...
SCL和SDA均需要通过上拉电阻连接到Vcc。上拉电阻的大小由I2C线路上的等效电容大小决定(想要了解更多,可以参考TI的I2C Pull-up Resistor Calculation这份文档,文档号:SLVA689;也可以看我的笔记里面的文章《I2C上升沿过长与上拉电阻》)。数据传送只能在总线空闲时初始化。如果SDA和SCL在一个STOP标志后均处于高电平状态...
12 Pullup Resistor Calculation ... 23 Speed Versus Power Trade-off ... 44 Example...
上拉电阻的大小由I2C线路上的等效电容大小决定(想要了解更多,可以参考TI的I2CPull-up Resistor Calculation这份文档,文档号:SLVA689;也可以看我的笔记里面的文章《I2C上升沿过长与上拉电阻》)。数据传送只能在总线空闲时初始化。如果SDA和SCL在一个STOP标志后均处于高电平状态,这时可以认为总线处在空闲状态。
I2C_Pullup_Resistor_CalculationSt**en 上传281.49 KB 文件格式 zip I2C是一种常用的串行通信协议,用于连接微控制器和外设。在I2C总线上,为了确保数据传输的可靠性,需要使用上拉电阻来提供总线上的恢复电流。 I2C上拉电阻的计算需要考虑两个主要因素:总线电容和总线速度。总线电容是指总线上所有设备的电容负载,包括...
The I2C specification (http://cache.nxp.com/documents/user_manual/UM10204.pdf) lists the maximum total bus capacitance with a pull-up resistor to be 200 pF (it can be up to 400 pF if the pull-up is a current source, section 5.1). ...
Pullup resistor calculation for I2C A customer's design wants to adjust the pull_ups value for their I2C interface, how to decide to accept their change? Is there a correct resistance value for I2C pull-up resistors? I2C Bus Pullup Resistor Calculation by TI...
Several parameter can affect the selection of the pull up resistor: - Power supply noise - How many device are connected on the I2C bus - distance between the ICs The impact is on the rise time, fall time and phase delay of SCL and SDA. ...
example system. For this example, we'll assume the bus is loaded down with lots of high input capacitance parts, so that the total bus capacitance is 50pF. We'll be running the system in Fast mode at 400 kHz and with a power supply of 3.3V. What pull-u...