Passive Keyless Entry (PKE) Transponder Configuration Circuit Diagram The figure shows an example of the configuration of a PKE transponder. This transponder includes the PIC16F639 device, external LC resonant circuit, push button, UHF transmitter, backup battery (optional), and 3V lithium battery.
A slip ring is an electromechanical device that allows electricity and data to pass through a rotating assembly. A mercury slip ring uses liquid mercury as the electrically conductive element inside the rotating assembly, as opposed to traditional carbon brushes. Mercury is a better conductor of electricity than carbon, and it also has a very low contact resistance. This makes it an ideal choice for applications that require high-speed data transmission or where reliability is critical. Mercury slip rings are used in a variety of industries, including medical technology, aerospace, and defense.
Why do we choose a mercury slip ring?
A slip ring is an electromechanical device that allows electrical current to pass between rotating objects. Slip rings are often used in applications where a cable or connector would otherwise twist and tangle as the object rotates. There are many different types of slip rings, but one of the most common is the mercury slip ring. Mercury slip rings offer several advantages over other types of slip rings, including high reliability, low maintenance, and long life. Here are three reasons why we choose a mercury slip ring:
1. Reliability: Mercury is an extremely reliable material, and mercury slip rings are among the most reliable types of slip rings available. Mercury has a very low failure rate, and it is not affected by changes in temperature or humidity. This makes mercury slip rings ideal for critical applications where reliability is essential.
2. Low Maintenance: Mercury slip rings require very little maintenance. Because mercury is a very inert substance, it does not corrode or generate any corrosive gases that would affect its reliability. Mercury slip rings do not require any lubrication, and they can operate in a wide range of temperatures and environments.
3. Economical Mercury slip rings have a lifetime cost advantage over other types of slip rings as well. Generally speaking, mercury slip rings are approximately 25% more expensive per kilowatt than other types of slip rings. However, because they require less maintenance and have a greater degree of reliability than other types of slip rings, they will save you money over the lifetime of your equipment.
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The digital part has two I/O ports, PORTA and PORTC. Each PORTA pin can be individually configured as an interrupt-on-change pin, while the PORTC pins have no interrupt-on-change feature. The AFE section shares the three I/O pins of RC1, RC2, and RC3 of the digital section PORTC, which are internally connected to the CS, SCLK/ALERT, and LFDATA/CCLK/RSSI/SDIO pads of the AFE, respectively. LFDATA/CCLK/RRSI and ALERT are AFE outputs. SDIO, SCLK, and CS are used to program or read the AFE configuration registers.
To save battery power, the AFE section is in the sleep mode while detecting the LF input signal. Although the AFE's output pad is internally connected to the PORTC pin, since the PORTC pin is not an interrupt-on-change pin, the AFE output cannot wake up the digital portion with an interrupt-on-change event. Therefore, it is recommended to connect the LFDATA and ALERT pins of the AFE to the PORTA pin externally, as shown in Figure 2.
The digital portion is woken up in one of three cases: the LFDATA pin has an AFE output; the ALERT pin has an AFE output; and the PORTA toggle button event is pressed.