Cypress CY3655 하드웨어 사용 설명서 - 페이지 8

{카테고리_이름} Cypress CY3655에 대한 하드웨어 사용 설명서을 온라인으로 검색하거나 PDF를 다운로드하세요. Cypress CY3655 17 페이지.

Using the enCoRe II Internal 3.3 Volt Regulator Output (VREG)

The enCoRe II has a built-in 3.3-volt regulator that can be used to supply external devices with

regulated voltage. To use the regulator for external devices, a 1.0uF or larger ceramic cap

must be loaded close to the output pin. For 40-pin devices, load the capacitor on position C2.

For 24-pin devices load the capacitor on position C9. The capacitor footprints on the board at

C2 and C9 are 0805 sized surface mount footprints. In addition there is a larger footprint

available to add a tantalum or electrolytic capacitor at C1 if more capacitance is desired for

larger transients, although the ceramic capacitor must still be used at C2 or C9 even if C1 is

loaded. Note that these capacitors must not be loaded if using the VREG pin (P1.2) on

enCoRe II as a GPIO. Be sure that the external circuitry does not consume more power than

the enCoRe II VREG output can provide as specified in the data sheet. Note that some

enCoRe II devices and all Wireless enCoRe II devices do not have an internal 3.3v regulator.

Wireless enCoRe II Development using the Applications Board

The Applications board provides a useful platform for Wireless enCoRe II development. The

following is a list of items to keep in mind when using the Applications board for Wireless

enCoRe II development.

• External power can be easily connected to the board using the Vcc and GND headers.

• The Wireless enCoRe II Pod must be used for emulation with voltages below 4 volts.

• The prototyping area of the board can be used to attach radio modules or other

components.

• Be aware of voltage restraints when using in-circuit programming. The ICE-Cube

powers the target at 3.3 volts when programming. The MiniProg powers the target at 5

volts when programming. Make sure any extra circuitry on the target board can

withstand the programming voltage.

In-circuit Programming on the Applications Board

enCoRe II devices and Wireless enCoRe II devices can be programmed while on the

Applications board using the ICE-Cube. Follow the programming steps below:

1. Using a USB cable plug the ICE-Cube into a PC that has the PSoC Programmer

application installed. Make sure the ICE-Cube is powered on.

2. Connect the yellow ISSP cable to the ICE-Cube through the RJ45 adapter. Note: Do

not use a black ISSP cable as it does not properly support enCoRe II or Wireless

enCoRe II.

3. Place the 5-pin end of the ISSP cable on the 5-pin header (J2) of the Applications

board. It will only go on in one orientation.

4. Make sure no external power supply is connected to Vcc or GND on the Applications

board. Make sure that a USB cable is not connected to connector J6. Make sure that a

PS/2 cable is not connected to connector J10. Note that the programming is done over

CY3655 Hardware User Guide

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