UCD3138064RMHT datasheet(79/104 Pages) TI

tên linh kiện	UCD3138064RMHT

Giải thích chi tiết về linh kiện	UCD3138064 Highly Integrated Digital Controller for Isolated Power With 64-kB Program Flash Memory

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12.1.4.3 External Clock

On the UCD3138128A device, if the XTAL_IN (Pin 61) and XTAL_OUT (Pin 62) are not used for an external

crystal, tie each one to 1.8V (Pin BP18) through a separate 1kohm resistor.

12.1.4.4 GPIOS

GPIO is referenced to DGND internally. When GPIO pins are not used connect the pins to SGND. Alternatively,

they can be configured as output pins and set as low in the firmware. When GPIOs are used to drive other circuit

like LED, be aware that traces can pick up noise. A local resistor close to the signal receiver (like LED) is used to

terminate the coupled noise. If the big voltage swings, clamping diodes are needed for GPIO inputs, as shown in

Clamping Diodes for GPIO.

Figure 12-3. Clamping Diodes for GPIO

12.1.4.5 DPWM PINS

If DPWMs travel for a longer distance than 3 inches from the control card to a main power stage, a Schottky

clamping diode may be needed as shown in Clamping Diodes for DPWM to prevent electrical overstress on

the device during lightning test. The long trace may also pick up the noise from other switching sources. Avoid

DPWM signals to cross switching nodes.

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UCD3138064

SLUSB72D – MARCH 2013 – REVISED APRIL 2021

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