TPS65982ABZBHR datasheet(57/121 Pages) TI1

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USB_EP

USB_RP

VDX_SRC

IDX_SNK

USB_EP

USB_RP

RDM_DWN

IDP_SRC

VLGC_HI

To ADC

C_USB_TP

C_USB_TN

C_USB_BP

C_USB_BN

TPS65982

www.ti.com

SLVSD02D – MARCH 2015 – REVISED JUNE 2019

Product Folder Links: TPS65982

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The transceiver is made up of a fully differential output driver, a differential to single-ended receive buffer and

two single-ended receive buffers on the D+/D– independently. The output driver drives the D+/D– of the selected

output of the Port Multiplexer. The signals pass through the 2nd Stage Port Data Multiplexer to the port pins.

When driving, the signal is driven through a source resistance RS_EP. RS_EP is shown as a single resistor in

USB Endpoint Phy but this resistance also includes the resistance of the 2nd Stage Port Data Multiplexer defined

in Port Data Multiplexer Requirements and Characteristics. RPU_EP is disconnected during transmit mode of the

transceiver.

When the endpoint is in receive mode, the resistance RPU_EP is connected to the D– pin of the top or bottom

port (C_USB_TN or C_USB_BN) depending on the detected orientation of the cable. The RPU_EP resistance

advertises low speed mode only.

9.3.4.8 Battery Charger (BC1.2) Detection Block

The battery charger (BC1.2) detection block integrates circuitry to detect when the connected entity on the USB

D+/D– pins is a charger. To enable the required detection mechanisms, the block integrates various voltage

sources, currents, and resistances to the Port Data Multiplexers. Figure 48 shows the connections of these

elements to the Port Data Multiplexers.

Figure 48. BC1.2 Detection Circuitry

9.3.4.9 BC1.2 Data Contact Detect

Data Contact Detect follows the definition in the USB BC1.2 specification. The detection scheme sources a

current IDP_SRC into the D+ pin of the USB connection. The current is sourced into either the C_USB_TP (top)

or C_USB_BP (bottom) D+ pin based on the determined cable/device orientation. A resistance RDM_DWN is

connected between the D– pin and GND. Again, this resistance is connected to either the C_USB_TN (top) or

C_USB_BN (bottom) D– pin based on the determined cable/device orientation. The middle section of Figure 48,

the current source IDP_SRC and the pulldown resistance RDM_DWN, is activated during data contact detection.

9.3.4.10 BC1.2 Primary and Secondary Detection

The Primary and Secondary Detection follow the USB BC1.2 specification. This detection scheme looks for a

resistance between D+ and D– lines by forcing a known voltage on the first line, forcing a current sink on the

second line and then reading the voltage on the second line using the general purpose ADC integrated in the

TPS65982. To provide complete flexibility, 12 independent switches are connected to allow firmware to force

voltage, sink current, and read voltage on any of the C_USB_TP, C_USB_TN, C_USB_BP, and C_USB_BN.

The left and right sections of Figure 48, the voltage source VDX_SRC and the current source IDX_SNK, are

activated during primary and secondary detection.

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