LG U300 Service Manual page 43

3. TECHNICAL BRIEF
3.10.2.3. USB
The MSM6250A device contains a Universal Serial Bus (USB) interface to provide an efficient interconnect
between the mobile phone and a personal computer (PC). The USB interface of the MSM6250A was
designed to comply with the definition of a peripheral as specified in USB Specification, Revision 1.1.
Therefore, by definition, the USB interface is also compliant as a peripheral with the USB Specification,
Revision 2.0. The USB Specification Revision 1.1 defines two speeds of operation, namely low-speed (1.5
Mbps) and full-speed (12 Mbps), both of which are supported by the MSM6250A. U300's USB interface
uses the PM6650-2 internal logic for USB Transceiver.
Name Note
USB_RCV Rx_Data to MSM
USB_DAT Data to/from MSM
USB_SE0 Data to/from MSM
USB_OE_N Out-Put Enable of Transceiver
USB_VBUS USB_Power From Host(PC)
USB_D+ USB Data+ to Host
USB_D- USB Data- to Host
MSM6250A
MSM6250A_USB Block
USIM PMIC USB
Figure. Schematic of USB block(MSM6250A Side & PM6650-2 Side)
Table. USB Signal Interface
USB_OE_N
USB_DAT
USB_SE0
Figure. SIM Interface
+VPWR
USB_VBUS
MicroSD
- 44 -
USB_VBUS
USB_D+
PM6650-2
USB_D-
PM6650-2_USB Block
C425
4.7u
smd_2520h1_6_r
USB_OE_N
4.7uH L401
USB_CNT_N
USB_DAT
D402 RB521S-30
R408 USB_D+
C427
47K
4.7u
USB_SE0
USB_D-
VBAT_TEMP
IO
Connector
VREG_USB
11
C426
USB_ID
1u 12
VREG_5V
13
USB_OE_N
14
VSW_5V
15
USB_CTL_N
16
USB_VBUS
17
USB_DAT
18
USB_D_P
19
USB_SE0
20
USB_D_M
21
GP1_DRV_N(MPP7)