Sim Interface - Siemens SXG 75 Service Repair Documentation

Signal
USB_DAT_VP
USB_SE0_VM
USB_OE_TP_N
USB_CONN_D_P
USB+CONN_D_M
USB interface signals

SIM Interface

19
The SIM interface is powered by VREG_UIM (3.0V). SIM cards with supply voltages of 3V are
supported only. 1.8V support may be made available if required (e.g. an operator's request).
The SIM interface consists of the three signals UIM_P_CLK, UIM_P_RESET and UIM_P_DATA, for
communication and the power-line VREG_UIM.
The SIM communication lines are managed by the MSM6250, and are level-shifted by the PM6650
to
meet VREG_UIM logic levels as shown below:
SIM interface
Z1500 provides ESD-protection and EM-compatibility, especially against RF-interference from
external sources.
Technical Documentation
TD_Repair_L3_SXG75_R1.0.pdf
Function
Plus (+) line of the digital-differential, bi-directional USB signal to/from
the MSM6250. Signal levels are translated between MSM and USB
domains within the PM6650 IC.
Minus (-) line of the digital-differential, bi-directional USB signal
to/from the MSM6250. Signal levels are translated between MSM and
USB domains within the PM6650 IC.
USB output enable signal (active LOW). Driven by MSM6250
Plus (+) line of the differential, bi-directional USB signal to/from the
accessory connector.
Minus (-) line of the differential, bi-directional USB signal to/from the
accessory connector.
Company Confidential
2006©BenQ
Release 1.0
01/2006
Page 70 of 73