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Most boards have enough capacitance on VCC to meet this need. Recent developments in lower cost resonators with included load capacitors make them usable as USB clock sources.
The crossover voltage is out of the specified range. In rare cases, the driver may be associated with a wrong device. The SMD pad is recommended for handheld applications because it has a stronger pad adhesion that provides higher thermal and mechanical reliability. In most self-powered designs, any general-purpose input pin can be used to sense VBUS. Suspend mode can also occur if the reference clock either driven externally or from the crystal oscillator is outside the tolerated accuracy range.
CN105760182A - FX2LP USB controller based FPGA configuration device - Google Patents
Cypress products are not warranted nor intended to be used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress.
The ball package meets the needs of space-sensitive PCB designs. Common via types are the following: Otherwise, use necking down traces; this makes the PCB easier to fx2lpp and ensures better yields. Control power supply ramp-down with a bleed resistor.
Cypress EZ-USB FX2LP (CY7C68XXX-X)
At plug-in, the LDO supplies chip power and begins charging the capacitor through the resistor. For bus-powered devices, the VBUS voltage is a good one to monitor since it is guaranteed to be valid down to 4.
They use a precision comparator and incorporate an degice time delay to ensure that RESET is held active long enough after power on to guarantee proper chip operation. For example, an active high WP pin should be connected to the 3. While the focus is on EEPROM devices, the same principles can be applied to other peripheral devices that devlce susceptible to the same conditions. If the capacitor has not discharged below the reset threshold, the chip receives power with the RESET pin voltage too high to reset the chip at t2.
Signal Line Space and Trace Width The ability to perform escape routing is defined by the width of the trace and the minimum space required between traces.
The following tests are recommended: Inrush current is above the acceptable limit. In extreme cases, it can damage the crystal. Cypress does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury revice the user.
This section concentrates on the first two powering methods since the third is a combination of them. These dimensions are crucial to get a precise PCB layout design. A band-aid for this problem is to add the diode in Figure 7 to speed up the capacitor voltage discharge at power down, but this only shortens the critical disconnect-reconnect time.
The voltage level at the beginning of the high-speed chirp is too devicr when coming out of suspend. SETUP packets with data stages can take up to milliseconds to respond, which is normally plenty of time to retrieve the requested data such as USB descriptors.
See Figure 13 for details. The USB host resumes signaling. The waveforms show voltage waveforms as a USB device is connected and then disconnected and reconnected in quick succession. The note concludes with a schematic review checklist to help you make any USB hardware design a success, and a description of Cypress software that helps with device checkout.
A simple RC filter works well. The amount of cross-coupling increases as the space between the microstrips is reduced. If it is not grounded, the FX2LP is placed into a test mode and does not operate correctly. Generally, there are two different surface land pad designs: When two microstrips run parallel to each other, cross-coupling occurs.
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