USB7252 datasheet(19/65 Pages) MICROCHIP

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2018 - 2020 Microchip Technology Inc.

DS00002736D-page 19

USB7252

3.3.1

PORT DISABLE CONFIGURATION (

PRT_DIS_P[4:1] / PRT_DIS_M[4:1])

The

PRT_DIS_P[4:1] / PRT_DIS_M[4:1] configuration straps are used in conjunction to disable the related port (4-1)

For

PRT_DIS_Px (where x is the corresponding port 4-1):

0 = Port x D+ Enabled

1 = Port x D+ Disabled

For

PRT_DIS_Mx (where x is the corresponding port 4-1):

0 = Port x D- Enabled

1 = Port x D- Disabled

3.3.2

NON-REMOVABLE PORT CONFIGURATION (

CFG_NON_REM)

The

CFG_NON_REM configuration strap is used to configure the non-removable port settings of the device to one of

five settings. These modes are selected by the configuration of an external resistor on the

CFG_NON_REM pin. The

resistor options are a 200 kΩ pull-down, 200 kΩ pull-up, 10 kΩ pull-down, 10 kΩ pull-up, and 10 Ω pull-down, as shown

in Table 3-2.

3.3.3

BATTERY CHARGING CONFIGURATION (

CFG_BC_EN)

The

CFG_BC_EN configuration strap is used to configure the battery charging port settings of the device to one of five

settings. These modes are selected by the configuration of an external resistor on the

CFG_BC_EN pin. The resistor

options are a 200 kΩ pull-down, 200 kΩ pull-up, 10 kΩ pull-down, 10 kΩ pull-up, and 10 Ω pull-down, as shown in

Table 3-3.

3.3.4

PF[31:2] CONFIGURATION (CFG_STRAP[2:1])

The USB7252 provides 30 programmable function pins (

PF[31:2]). These pins can be configured to 4 predefined con-

figurations via the

CFG_STRAP[2:1] pins. These configurations are selected via external resistors on the

CFG_STRAP[2:1] pins, as detailed in Table 3-4. Resistor values and combinations not detailed in Table 3-4 are reserved

and should not be used.

Note:

Both

PRT_DIS_Px and PRT_DIS_Mx (where x is the corresponding port) must be tied to 3.3 V to disable

the associated downstream port. Disabling the USB 2.0 port will also disable the corresponding USB 3.0

port.

TABLE 3-2:

CFG_NON_REM RESISTOR ENCODING

CFG_NON_REM Resistor Value

Setting

200 kΩ Pull-Down

All ports removable

200 kΩ Pull-Up

Port 1 non-removable

10 kΩ Pull-Down

Ports 1, 2 non-removable

10 kΩ Pull-Up

Ports 1, 2, 3 non-removable

10 Ω Pull-Down

Ports 1, 2, 3, 4 non-removable

TABLE 3-3:

CFG_BC_EN RESISTOR ENCODING

CFG_BC_EN Resistor Value

Setting

200 kΩ Pull-Down

Battery charging not enable on any port

200 kΩ Pull-Up

BC1.2 DCP and CDP battery charging enabled on Port 1

10 kΩ Pull-Down

BC1.2 DCP and CDP battery charging enabled on Ports 1, 2

10 kΩ Pull-Up

BC1.2 DCP and CDP battery charging enabled on Ports 1, 2, 3

10 Ω Pull-Down

BC1.2 DCP and CDP battery charging enabled on Ports 1, 2, 3, 4

USB7252 Datasheet(PDF) 19 Page - Microchip Technology

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