FXLP4555 FAIRCHILD [Fairchild Semiconductor], FXLP4555 Datasheet - Page 3

• Manufacturer Part Number: FXLP4555
• Description: 1.8V / 3.0V SIM Card Power Supply and Level Shifter
• Manufacturer: FAIRCHILD [Fairchild Semiconductor]

© 2010 Fairchild Semiconductor Corporation
FXLP4555 • Rev. 1.0.0
Pin Configuration
Pin Definitions
Pin
10
11
12
13
1
2
3
4
5
6
7
8
9
VCC_C
RST_C
CLK_C
CLK_H
Name
VCCA
VSEL
VBAT
I/O_C
GND
NC
NC
NC
EN
GROUND
OUTPUT
OUTPUT
OUTPUT
POWER
POWER
POWER
INPUT/
INPUT
INPUT
INPUT
Type
Power-Down Mode. EN=LOW → low-current Shutdown Mode activated. EN=HIGH →
normal operation. A LOW level on this pin resets the SIM interface, switching off the
V
The signal present on this pin programs the SIM_V
VSEL=LOW → SIM_V
Connected to the baseband power supply; this pin configures the level shifter input
stage to accept signals from the baseband. A 0.1µF capacitor is used to bypass the
power supply voltage. When V
disabled and FXLP4555 enters Shutdown Mode.
No connect. It is recommended to solder to PCB GND.
LDO converter supply input. The input voltage ranges from 2.7V to 5.5V. This pin
needs to be bypassed by a 0.1µF capacitor.
No connect. It is recommended to solder to PCB GND.
Connected to the SIM card power supply pin. An internal LDO converter is
programmable by the external baseband to supply either 1.8V or 3.0V output voltage.
An external 1.0µF minimum ceramic capacitor must be connected across V
GND. During a normal operation, the V
3.0V value, or can start directly at either of these values.
Handles the connection to the serial I/O of the card connector. A bi-directional level
translator adapts the serial I/O signal between the card and the baseband. A 14kΩ
(typical) pull-up resistor provides a high-impedance state for the SIM card I/O link.
Connected to the RESET pin of the card connector. A level translator adapts the
external reset (RST) signal to the SIM card.
Ground reference for the integrated circuit and associated signals. Care must be
taken to avoid voltage spikes when the device operates in normal operation.
Connected to the CLOCK pin of the card connector. The CLOCK (CLK) signal comes
from the external clock generator; the internal level shifter adapts the voltage defined
for the V
No connect. It is recommended to solder to PCB GND.
The clock signal, coming from the external controller, must have a duty cycle within
the range defined by the specification (typically 50%). The built-in level shifter
translates the input signal to the external SIM card CLK input.
CC_C
.
VCCA
VSEL
NC
Figure 3. Pin Assignments (Top View)
EN
CC_C
.
1
2
3
4
16
5
Exposed DAP
CC
FXLP4555
15
6
(GND)
=1.8V; VSEL=HIGH → SIM_V
3
14
7
CCA
13
is below 1.1V (typical), the V
8
Description
CC_C
12
11
10
9
voltage can be set to 1.8V, followed by a
CLK_C
RST_C
GND
NC
CC
value:
CC
=3V.
CC_C
(SIM Card V
www.fairchildsemi.com
CC_C
and
CC
) is