Nxp semiconductors – NXP Semiconductors LPC24XX UM10237 User Manual
Page 396
UM10237_4
© NXP B.V. 2009. All rights reserved.
User manual
Rev. 04 — 26 August 2009
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NXP Semiconductors
UM10237
Chapter 15: LPC24XX USB OTG controller
The following figures show different ways to realize connections to an USB device using
ports U1 and U2. The example described here uses an ISP1302 for the external OTG
transceiver and the USB Host power switch LM3526-L (National Semiconductors).
6.1 Connecting port U1 to an external OTG transceiver
For OTG functionality an external OTG transceiver must be connected to the LPC2400
device. There are two ways to connect the OTG transceiver (here ISP1302, replaces
ISP1301) to port U1:
Table 361. USB OTG port 1 pins
Pin name
Direction
Description
Pin category
V
BUS
I
V
BUS
status input. When this function is not enabled
via its corresponding PINSEL register, it is driven
HIGH internally.
USB Connector
Port U1
USB_D+1
I/O
Positive differential data
USB Connector
USB_D
−1
I/O
Negative differential data
USB Connector
USB_CONNECT1 O
SoftConnect control signal
Control
USB_UP_LED1
O
GoodLink LED control signal
Control
USB_INT1
I
OTG ATX interrupt
External OTG transceiver
USB_SCL1
I/O
I
2
C serial clock
External OTG transceiver
USB_SDA1
I/O
I
2
C serial data
External OTG transceiver
USB_TX_E1
O
Transmit enable
External OTG transceiver
USB_TX_DP1
O
D+ transmit data
External OTG transceiver
USB_TX_DM1
O
D
− transmit data
External OTG transceiver
USB_RCV1
I
Differential receive data
External OTG transceiver
USB_RX_DP1
I
D+ receive data
External OTG transceiver
USB_RX_DM1
I
D
− receive data
External OTG transceiver
USB_LS1
O
Low speed status (applies to host functionality only)
External OTG transceiver
USB_SSPND1
O
Bus suspend status
External OTG transceiver
USB_PPWR1
O
Port power enable
Host power switch
USB_PWRD1
I
Port power status
Host power switch
USB_OVRCR1
I
Over-current status
Host power switch
USB_HSTEN1
O
Host enabled status
Port U2
USB_D+2
I/O
Positive differential data
USB Connector
USB_D
−2
I/O
Negative differential data
USB Connector
USB_CONNECT2 O
SoftConnect control signal
Control
USB_UP_LED2
O
GoodLink LED control signal
Control
USB_PPWR2
O
Port power enable
Host power switch
USB_PWRD2
I
Port power status
Host power switch
USB_OVRCR2
I
Over-current status
Host power switch
USB_HSTEN2
O
Host enabled status
Control