101 resistor

Source: http://www.elecfans.com/dianzichangshi/2009062872843.html What is a pull-up resistor and a drop-down resistor? What are their functions? The pull-up resistor is generally the resistor in the circuit where one end is connected to the power supply and the other end is connected to the chip pin. The pull-down

Http://forum.eepw.com.cn/thread/149216/1 What is a pull-up resistor? What is a drop-down resistor?Pulling up is to embed uncertain signals through a resistor at a high level! The resistor can throttling at the same time! The same is true for the drop-down!Pull-up refers to the injection of current to the device, and t

First, the definition:The pull-up is to pass the indeterminate signal through a resistor clamp at high level! Resistance at the same time to limit the flow of action! Pull the same!Pull is to inject current into the device, the drop is the output current, the weak strong is only the resistance of the pull-up resistor is different, there is no strict distinction between the non-collector (or drain) open-circ

The so-called high level is referred to as the low level. Pull up, is through a resistor to connect the signal to the power supply, usually used for clock signal data signal. A drop-down is a signal grounded by a resistor and is generally used to protect the signal. This is designed according to the needs of the circuit, the main purpose is to prevent interference, increase the stability of the circuit. If

(i) pull-up resistor:1, when the TTL circuit drives the COMs circuit, if the TTL circuit output high level is lower than the COMs circuit's lowest high level (generally 3.5V), then the output of the TTL will need to connect the pull-up resistor to improve the output high level value.2, OC Gate Circuit must be coupled with a pull resistor, in order to use.3, in or

Magnetic beadsMagnetic beads (ferrite bead) materials are iron-magnesium or iron-nickel alloys, these materials have a high resistivity and permeability, at high frequencies and high impedance, inductance in the inner ring between the capacitance value will be minimal. Beads are usually only suitable for high-frequency circuits, because at low frequencies they are essentially the complete characteristics of the inductor (including the resistive and reactive components), which can cause a slight

We often see a pull-up resistor in the write driver process, sometimes listening to hardware engineers saying that pull-up is not enough, or that the pull is too small. I have not studied the role of it before, just know that can play a stable level, improve the role of driving capacity. Generally used for OC (open colector) gate, OD Gate (open Drain, open drain, one of which is an i²c bus) or a circuit with insufficient output drive capability. Recen

In some PCB layout, we will often see in the interface of the I²C communication, often access a 4.7K resistor, some datasheet above clearly have requirements, need to access, and some do not require.I²c interfaceFor single-chip microcomputer, some IO internal pull-up resistor can be enabled, this eliminates the external pull-up resistor, which is for the microcon

introduction of resistor selection experience Introduction of resistor selection experience1. Fixed resistor selection fixed resistors are available in a variety of types, the choice of which material and structure of the resistor, according to the specific requirements of the application circuit. The high-frequency ci

totalitemcount) {} @Override public boolean ontouchevent (motionevent ev) {if (isrefreshable) {switch (ev.ge Taction ()) {case MotionEvent.ACTION_DOWN:if (!isrecored) {isrecored = True ; Starty = (int) ev.gety ();//Record the current position when the finger is pressed} break; Case MotionEvent.ACTION_UP:if (state! = Refreshing state! = LOADING) {if (s Tate = = Pull_to_refresh) {state = done; Changeheaderviewbystate ();

at a maximum of up to Ma, while the P0 is more capable, allowing the maximum total current to be poured into the pin atThe sum of the allowable sink currents for all four interfaces, up to a maximum of four mA.And when these pins "output high", the microcontroller "pull the current" capability? It is too bad to be less than 1 MA.The conclusion is: when the MCU output low level, the driving ability is fair, and the output high level, there is no output current capacity.This conclusion is made in

USB protocol required, 1.5K pull-up at d+ when indicated to be full speed device, in D-Indicates not full speed deviceSome scenarios (such as PNX5230) recommend that the d+/d-pull the 1M resistor is to improve the stability of the data transmission①usb has master and slave equipment, main equipment: PC, now on the market those plug U-disk can play mp3 "MP3" and the like,The USB signal is a differential signal, the signal line is d+, D-,。 On the USB ho

About the USB pull-up resistor, not just a random resistance to any resistor on the OK.When your USB is the main device , the d+, D-on is connected to a 15K pull-down resistor, which allows the d+, D-to remain low when no device is plugged in;When interfacing to slave devices , the different transfer rates can be set by the pull-up

1 IntroductionThe pull-up resistor is typically used in a microcontroller and some digital logic devices to connect a switch or a button to indicate the state of the input.For example, enter as "High" ("1") when the button is turned on, and enter as "Low" ("0") when the button is off.When the button is pressed, if there is no pull-up resistor, the GND will be connected directly to VCC, resulting in a short

frequencies, it basically only has a reactive component (JwL), and the resistance component increases as the frequency rises. Like some plls, oscillation circuits, including UHF memory power (Ddr,sdram,rambus, etc.) need to be added to the power input part of the magnetic beads. Ferrite beads can be seen as a series of resistors and inductors, as shown in 3.5, usually used as a passive low-pass filter. At high frequencies, it exhibits resistance, so it can maintain high impedance in a fairly wi

DescribeFor resistors with resistance of R1 and R2, the parallel resistor resistance formula is calculated as follows:R = 1/(1/R1 + 1/r2)Input two resistor impedance size, floating point, separated by a space. The impedance after the output is in parallel, the result is 2-bit sample input after the decimal point is retained1 2Sample output0.67Hint that the calculation process uses the float type1#include 2#

Apple defines 3 charging currents for the charger, which are 0.5a/1a/2.1a. This is achieved by a combination of 3 different resistors. When an Apple device ipad,iphone,ipod the USB port charger, it detects the voltage on the USB d+ and D-to determine the output current of the charger, and then combines its own required current to determine the specific input current.0.5A Charger USB Port Settings1 A charger USB port settings2.1A Charger USB Port Settings2.4A Charger USB Port SettingsSetting of t

101 questions and answers for RHCE (7) and 101 questions and answers for rhce To make it easier for people who plan to perform RedHat certification and O M work to learn more systematically, I have selected 101 RHCE questions and answers from the Internet. Considering that the daily learning volume is large, therefore, we extract 10 questions every day for p

[IOS development-101] solution: The file * couldn't be opened because you don't have permission to view it, ios-101 (1) The error message "The file * couldn't be opened because you don't have permission to view it" appears for no reason. Solution: Window> Organizer> select your project name on the left of the box below> delete on the right and click delete. It will not affect your files. After deletion,

($splits as $key = = $step) { if (Strpos ($var, $key)) { $strs = Explode ($key, $var); $start + = Cntoint (Array_shift ($strs)) * $STEP; $var = Join ("', $strs); } } foreach ($chars as $key = = $step) { if (Strpos ($var, $key)!== FALSE) { $vs = Explode ($key, $var); if ($vs [0] = = = = "") { $vs [0] = ' one '; } $start + = $Ints [Array_shift ($VS)] * $STEP; $var = Join ("', $vs); } elseif (Mb_strlen ($var, ' utf-8 ') = =