Microcontrollers User manual

UM10237_2 © NXP B.V. 2008. All rights reserved.
User manual Rev. 02 — 19 December 2008 395 of 792
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 ISP1301 (NXP) 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 ISP1301) to port U1:
Table 361. USB OTG port 1 pins
Pin name Direction Description Pin category
V
BUS
IV
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
U
SB_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
U
SB_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
U
SB_LS1 O Low speed status (applies to host functionality only) External OTG transceiver
U
SB_SSPND1 O Bus suspend status External OTG transceiver
U
SB_PPWR1 O Port power enable Host power switch
USB_PWRD1 I Port power status Host power switch
U
SB_OVRCR1 I Over-current status Host power switch
U
SB_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
U
SB_PPWR2 O Port power enable Host power switch
USB_PWRD2 I Port power status Host power switch
U
SB_OVRCR2 I Over-current status Host power switch
U
SB_HSTEN2 O Host enabled status Control