TPS65982ABZBHR datasheet(67/121 Pages) TI1

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PORT_DETx

PORT_intx

UART_RX

UART_RXin

CMOS

Output

UART_TXout

UARTTX_RO

UART_TX

OD_DO

TPS65982

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SLVSD02D – MARCH 2015 – REVISED JUNE 2019

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Figure 56. IOBUF_OD Output Buffer

9.3.18.3 IOBUF_UTX

The push-pull output driver is shown in Figure 57. The output buffer has a UARTTX_RO source resistance. The

supply voltage to the system side buffer is configurable to be LDO_3V3 by default or VDDIO. This is not shown

in Figure 57. The supply voltage to the port side buffers remains LDO_3V3.

Figure 57. IOBUF_UTX Output Buffer

9.3.18.4 IOBUF_URX

The input buffer is shown in Figure 58. The supply voltage to the system side buffer is configurable to be

LDO_3V3 by default or VDDIO. This is not shown in Figure 58. The supply voltage to the port side buffers

remains LDO_3V3.

Figure 58. IOBUF_URX Input

9.3.18.5 IOBUF_PORT

The input buffer is shown in Figure 59. This input buffer is connected to the intermediate nodes between the 1st

stage switch and the 2nd stage switch for each port output (C_SBU1/2, C_USB_TP/N, C_USB_BN/P). The input

buffer is enabled via firmware when monitoring digital signals and disabled when an analog signal is desired. See

theFigure 45 section for more detail on the pullup and pulldown resistors of the intermediate node.

Figure 59. IOBUF_PORT Input Buffer

9.3.18.6 IOBUF_I2C

The I2C I/O driver is shown in Figure 60. This I/O consists of an open-drain output and an input comparator with

deglitching. The supply voltage to this buffer is configurable to be LDO_3V3 by default or VDDIO. This is not

shown in Figure 60. Parameters for the I2C clock and data I/Os are found in I2C Slave Characteristics.

TPS65982ABZBHR Datasheet(PDF) 67 Page - Texas Instruments