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Apalis Carrier Board Design Guide
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The power enable signal USBH_EN is shared with the all three other host interfaces USBH2,
USBH3 and USBH4. If USB bus power supply needs to be switched individually for each port, any
free pin with GPIO functionality could be used to control the USB power rails individually. In this
case the USB driver needs to support such an implementation.
The USBH_OC# signal is shared between all the USB host ports of the Apalis. Since the signal is
open drain type, it can be connected directly to the all overcurrent output ports. The signal requires
a pull-up resistor on the carrier board.
Figure 29: USB 2.0 host reference schematic
2.5.3
Unused USB Signal Termination
Apalis
Pin
Apalis
Signal Name
Recommended Termination
74
Leave NC if not used
76
USBO1_D-
Leave NC if not used
62
USB
Leave NC if not used
64
USBO1_SSRX-
Leave NC if not used
68
USB
Leave NC if not used
70
USBO1_SSTX-
Leave NC if not used
80
Leave NC if not used
82
USBH2_D-
Leave NC if not used
86
Leave NC if not used
88
USBH3_D-
Leave NC if not used
98
Leave NC if not used
100
USBH4_D-
Leave NC if not used
94
USB
Leave NC if not used
92
USB H4_SSRX-
Leave NC if not used
106
USB
Leave NC if not used
104
USB H4_SSTX-
Leave NC if not used
72
USBO1_ID
Leave NC and set the USB port direction in software to host or client OR ground the pin if port is
used permanently as host OR add pull-up resistor if port is used as slave.
60
USBO1_VBUS
Leave NC if not used
274
USBO1_EN
Leave NC if not used
GND
2A
220R@100MHz
L3
1nF
50V
C3
GND_USBH2
100nF
16V
C1
GND
100uF
10V
+C2
GND
TPS2052BD
V_IN
2
EN_1
3
OUT_1
7
OC_1#
8
IC1A
GND
2A
220R@100MHz
L2
90R@100MHz
1
2
3
4
L1
USBH2_D_N
USBH2_D_P
USBH2_D_CON_N
USBH2_D_CON_P
330R
R1
GND
GREEN
LED1
TPD2EUSB30DRTR
1
2
D+
D-
D2
GND
SHIELD
VCC_USBH2
VCC_USBH2
USBH_OC#
USBH_EN
GND_USBH2
Optional
MM70-314-310B1
USBO1_VBUS
60
Apalis - USB
3 of 25
USBH2_D-
82
80
USBO1_SSTX-
70
USB
68
USBO1_ID
72
USBO1_SSRX-
64
USB
62
USBH_EN
84
USBH3_D-
88
86
USBH4_D-
100
98
USBO1_D-
76
74
USBH_OC#
96
USBH4_SSTX-
104
USB
106
USBH4_SSRX-
92
USB
94
USBO1_OC#
262
USBO1_EN
274
X1C
USB_CTRL[0..1]
USBH_OC#
USBH_EN
TPS2052BD
GND
1
EN_2
4
OC_2#
5
OUT_2
6
IC1B
GND
5V_SW
VCC
1
D-
2
D+
3
GND
4
292303-1
S1
S2
S3
S4
X2
R2
100K
3.3V_SW
R3
100K
GND