Microchip Technology USB5744, Manual

Page: 16 / 48

USB5744
DS00001855E-page 16

2015-2017 Microchip Technology Inc.
3.4.2 PORT DISABLE CONFIGURATION (
PRT_DIS_P[4:1] / PRT_DIS_M[4:1]
)
The
PRT_DIS_P[
4
:1]
and
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
3.4.3 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 k Ω pull-down, 200 k Ω pull-up, 10 k Ω pull-down, 10 k Ω pull-up, and 10 Ω pull-down, as shown
in Table 3-11 .
3.4.4 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 k Ω pull-down, 200 k Ω pull-up, 10 k Ω pull-down, 10 k Ω pull-up, and 10 Ω pull-down, as shown in
Table 3-12 .
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 3.1
Gen 1 port.
TABLE 3-11: CFG_NON_REM RESISTOR ENCODING
CFG_NON_REM
Resistor Value Setting
200 k Ω Pull-Down All ports removable
200 k Ω Pull-Up Port 1 non-removable
10 k Ω Pull-Down Port 1, 2 non-removable
10 k Ω Pull-Up Port 1, 2, 3, non-removable
10 Ω Pull-Down Port 1, 2, 3, 4 non-removable
TABLE 3-12: CFG_BC_EN RESISTOR ENCODING
CFG_BC_EN
Resistor Value Setting
200 k Ω Pull-Down No battery charging
200 k Ω Pull-Up Port 1 battery charging
10 k Ω Pull-Down Port 1, 2 battery charging
10 k Ω Pull-Up Port 1, 2, 3, battery charging
10 Ω Pull-Down Port 1, 2, 3, 4 battery charging