TUSB2E11 datasheet(46/58 Pages) TI1

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Table 12-1. Design Parameters for High Loss USB 2.0 System Using I2C (continued)

PARAMETER

VALUE(1)

USB 2.0 TX Pre-emphasis

U_HS_TX_PRE_EMPHASIS_P1

(Offset = 71h)

3Ch

2.1 dB

USB 2.0 RX Equalization

U_RX_ADJUST_PORT1

(Offset = 72h)

92h

1.09 dB

USB 2.0 HS host disconnect threshold (peak differential)

U_DISCONNECT_SQUELCH_PORT1

(Offset = 73h)

83h

685 mV

USB 2.0 HS squelch/RX sensitivity threshold (peak differential)

U_DISCONNECT_SQUELCH_PORT1

(Offset = 73h)

83h

111 mV

Table 12-2. Design Parameters for Medium Loss USB 2.0 System Using I2C

PARAMETER

VALUE(1)

VDD3V3

3.3 V ±10%

VDD1V8

1.8 V ±5%

I2C support required in system (Yes or No)

Yes

Parameter

Setting

Value

USB 2.0 TX Swing (peak to peak)

U_TX_ADJUST_PORT1

(Offset = 70h)

79h

920 mVp-p

USB 2.0 TX Pre-emphasis

U_HS_TX_PRE_EMPHASIS_P1

(Offset = 71h)

39h

0.9 dB

USB 2.0 RX Equalization

U_RX_ADJUST_PORT1

(Offset = 72h)

92h

1.09 dB

USB 2.0 HS host disconnect threshold (peak differential)

U_DISCONNECT_SQUELCH_PORT1

(Offset = 73h)

83h

685 mV

USB 2.0 HS squelch/RX sensitivity threshold (peak differential)

U_DISCONNECT_SQUELCH_PORT1

(Offset = 73h)

83h

111 mV

(1)

These parameters are starting values for a high loss system. Further tuning might be required based on specific loss profile and

measurements.

Table 12-3. Design Parameters for Medium Loss USB 2.0 System without I2C and Configured for Charger

Detection

PARAMETER

VALUE(1)

VDD3V3

3.3 V ±10%

VDD1V8

1.8 V ±5%

I2C support required in system (Yes or No)

SCL (pull-down resistor to ground)

1.65 kΩ

SDA (pull-down resistor to ground)

100 kΩ

SDA (pull-up resistor to VBUS5V)

324 kΩ

Parameter

GPIO0

GPIO1

GPIO2

Value

USB 2.0 TX Swing (peak to peak)

Float

Pull-up

920 mVp-p

USB 2.0 TX Pre-emphasis

Float

Pull-up

0.9 dB

USB 2.0 RX Equalization

Float

Pull-up

1.09 dB

USB 2.0 HS host disconnect threshold (peak differential)

Float

Pull-up

685 mV

USB 2.0 HS squelch/RX sensitivity threshold (peak differential)

Float

Pull-up

98 mV

(1)

These parameters are starting values for a medium loss system. Further tuning might be required based on specific loss profile and

measurements.

TUSB2E11

SLLSFI4B – NOVEMBER 2021 – REVISED AUGUST 2023

www.ti.com

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