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UCD3138064RMHT Datasheet(PDF) 79 Page - Texas Instruments

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Part # UCD3138064RMHT
Description  UCD3138064 Highly Integrated Digital Controller for Isolated Power With 64-kB Program Flash Memory
PDF  104 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCD3138064RMHT Datasheet(HTML) 79 Page - Texas Instruments

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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.
www.ti.com
UCD3138064
SLUSB72D – MARCH 2013 – REVISED APRIL 2021
Copyright © 2021 Texas Instruments Incorporated
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