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UCD3138RMHT 数据表(PDF) 74 Page - Texas Instruments |
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UCD3138RMHT 数据表(HTML) 74 Page - Texas Instruments |
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74 / 99 page  12.1.4.3 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 Figure 12-3. Figure 12-3. Clamping Diodes for GPIO 12.1.4.4 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 Figure 12-4to 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. UCD3138 SLUSAP2J – MARCH 2012 – REVISED NOVEMBER 2021 www.ti.com 74 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: UCD3138 |
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