User Manual

Internal pull-up resistor 3.3V to D+, 3.3V to D- 1.425 1.5 1.575
KΩ
Internal pull-down resistor D+ to GND, D- to GND 14.3 15 24.8
KΩ
USIM Interface
The USIM signals are defined on system connector to provide the interface between
the removable User Identity Module. USIM interface usually run off either 1.8V or
3.0V.
Pin Name Direction Description
8 UIM_PWR Output
Power source for the USIM
10 UIM_DATA Input / Output
USIM data signal
12 UIM_CLK Output
USIM clock signal
14 UIM_RESET Output
USIM reset signal
Parameter Comments Min Typ Max Unit
Logic High Input Voltage 1.8525 2.85 3.15 V
Logic Low Input Voltage -0.3 0 0.9975 V
Logic High Output Voltage 2.4 2.85 2.85 V
Logic Low Output Voltage -0.3 0 0.45 V
Schmitt Hysteresis 150 mV
Logic input leakage current -200 200 nA
Internal pull-up resistor Programmable range 1 30
KΩ