ZHCSIY2 数据表 | 德州仪器 TI.com.cn

SLVSDB5B July 2018 – August 2021 TPS65988

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6.9 USB-PD Baseband Signal Requirements and Characteristics

over operating free-air temperature range (unless otherwise noted)

PARAMETER		TEST CONDITIONS	MIN	TYP	MAX	UNIT
COMMON
PD_BITRATE	PD data bit rate		270	300	330	Kbps
UI ⁽²⁾	Unit interval (1/PD_BITRATE)		3.03	3.33	3.7	µs
CCBLPLUG ⁽¹⁾	Capacitance for a cable plug (each plug on a cable may have up to this value)				25	pF
ZCABLE	Cable characteristic impedance		32		65	Ω
CRECEIVER ⁽³⁾	Receiver capacitance. Capacitance looking into Cx_CCn pin when in receiver mode.			100		pF
TRANSMITTER
ZDRIVER	TX output impedance. Source output impedance at the Nyquist frequency of USB2.0 low speed (750kHz) while the source is driving the C_CCn line.		33		75	Ω
t_RISE	Rise time. 10 % to 90 % amplitude points, minimum is under an unloaded condition. Maximum set by TX mask.		300			ns
t_FALL	Fall time. 90 % to 10 % amplitude points, minimum is under an unloaded condition. Maximum set by TX mask.		300			ns
V_TX	Transmit high voltage		1.05	1.125	1.2	V
RECEIVER
V_RXTR	Rx receive rising input threshold	Port configured as Source	840	875	910	mV
V_RXTR	Rx receive rising input threshold	Port configured as Sink	504	525	546	mV
V_RXTF	Rx receive falling input threshold	Port configured as Sink	240	250	260	mV
V_RXTF	Rx receive falling input threshold	Port configured as Source	576	600	624	mV
NCOUNT	Number of transitions for signal detection (number to count to detect non-idle bus).		3
TTRANWIN	Time window for detecting non-idle bus.		12		20	µs
ZBMCRX	Receiver input impedance	Does not include pull-up or pulldown resistance from cable detect. Transmitter is Hi-Z.	5			MΩ
TRXFILTER ⁽⁴⁾	Rx bandwidth limiting filter. Time constant of a single pole filter to limit broadband noise ingression		100			ns

(1) The capacitance of the bulk cable is not included in the CCBLPLUG definition. It is modeled as a transmission line.

(2) UI denotes the time to transmit an unencoded data bit not the shortest high or low times on the wire after encoding with BMC. A single

data bit cell has duration of 1 UI, but a data bit cell with value 1 will contain a centrally place 01 or 10 transition in addition to the

transition at the start of the cell.

(3) CRECEIVER includes only the internal capacitance on a C_CCn pin when the pin is configured to be receiving BMC data. External

capacitance is needed to meet the required minimum capacitance per the USB-PD Specifications. TI recommends adding capacitance

to bring the total pin capacitance to 300 pF for improved TX behavior.

(4) Broadband noise ingression is because of coupling in the cable interconnect.

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6.9 USB-PD Baseband Signal Requirements and Characteristics