TDA4VEN...Q1 datasheet(80/236 Pages) TI

80 / 236 page

Note

All other unused signal balls with a Pad Configuration Register can be left unconnected with their

multiplexing mode set to GPIO input and internal pull-down resistor enabled. Unused balls are defined

as those which only connect to a PCB solder pad. This is the only use case where internal pull

resistors are allowed as the only source/sink to hold a valid logic level. Any balls connected to a via,

test point, or PCB trace are consider used and must not depend on the internal pull resistor to hold a

valid logic level.

Internal pull resistors are weak and may not source enough current to maintain a valid logic level

for some operating conditions. This can be the case when connected to components with leakage

to the opposite logic level, or when external noise sources couple to signal traces attached to balls

which are only pulled to a valid logic level by the internal resistor. Therefore, external pull resistors are

recommended to hold a valid logic level on balls with external connections.

Many of the device IOs are turned off by default and external pull resistors may be required to hold

inputs of any attached device in a valid logic state until software initializes the respective IOs. The

state of configurable device IOs are defined in the BALL STATE DURING RESET RX/TX/PULL and

BALL STATE AFTER RESET RX/TX/PULL columns of the Pin Attributes table. Any IO with its input

buffer (RX) turned off is allowed to float without damaging the device. However, any IO with its input

buffer (RX) turned on shall never be allowed to float to any potential between VILSS and VIHSS. The

input buffer can enter a high-current state which could damage the IO cell if allowed to float between

these levels.

TDA4VEN-Q1, TDA4AEN-Q1

SPRSP96A – MARCH 2024 – REVISED SEPTEMBER 2024

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TDA4VEN...Q1 数据表(PDF) 80 Page - Texas Instruments