Usim Card Interface Signals - Intel PXA27 Series Design Manual

Table 19-1. PXA27x Processor Interface Signals Summary (Sheet 2 of 2)
Name
VCC_USIM Input
VSS_USIM Input
NOTES:
1. Exercise care when placing the PXA27x processor into deep-sleep power mode. The voltage control
pins are powered from the VCC_IO power domain. In deep-sleep mode, the power is turned off.
Powering off the voltage select pins (UVS0,nUVS1,nUVS2) causes shorting of the power supplies that
are switched to provide power to the card. To prevent these electrical problems:
a. Turn off the external power supply before (or at the same time as) the processor enters deep-
b. Configure GPIOs correctly prior to entering deep-sleep mode using software writes to
2. The control and status of this signal is defined using the
Register (PUCR)
Family Developers Manual .
3. Voltage level of pads is set off chip. The pads work at either 1.8 V or 3.0 V.
19.2.2

USIM Card Interface Signals

See Table 19-2
processor USIM interface and the USIM card.
Table 19-2. USIM Card Signals
Card Signal
Data input/output (bidirectional) pad with a pull-up resistor
I/O
Refer to ISO Standard 7816-3 for pad specifications.
CARD_RST USIM card reset
Clock input
Frequencies are between 1.0 MHz and 5.0 MHz
Refer to ISO Standard 7816-3 for pad specifications. Clock stops on
CLK_CARD
low or high phase are supported.
NOTE: Cards manufactured before April 2000 have a frequency
limitation of 4.0 MHz.
Card power supply
Supplies 0 V, 1.8 V, 3.0 V with maximum currents of 0 mA, 30 mA,
VCC
50 mA, respectively according to card class (B,C)
Refer to ISO Standard 7816-3 for pad specifications.
Mutual USIM card, PXA27x processor USIM interface, and VCC
GND
ground reference voltage
Intel® PXA27x Processor Family Design Guide
Type
USIM Pads VCC connection (1.8 V or 3.0 V)
USIM Pad ground connections
sleep power mode using USIM[USCCR] bit field.
USIM[USCCR]. Refer to the GPIO chapter in the Intel
Manual for more details.
in the Clocks and Power Manager Unit chapter of the Intel
for the list of the five USIM card signals which connect between the PXA27x
Function
USIM Controller Interface
Description
®
PXA27x Processor Family Developers
Power Manager USIM Card Control/Status
®
PXA27x Processor
Signal Direction
USIM card <-> PXA27x
processor
PXA27x processor –>
USIM card
PXA27x processor –>
USIM card
Power supply –> Card
Power supply –> Card
PXA27x
Processor
Signal
UIO
nURST
UCLK
VCC_USIM
VSS_USIM
II:19-3