FXLP4555MPX datasheet(4/15 Pages) ONSEMI

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FXLP4555 • Rev. 1.0.0

Pin Configuration

FXLP4555

Exposed DAP

(GND)

VSEL

VCCA

RST_C

GND

CLK_C

Figure 3. Pin Assignments (Top View)

Pin Definitions

Name

Type

Description

INPUT

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

VCC_C.

VSEL

INPUT

The signal present on this pin programs the SIM_VCC value:

VSEL=LOW

→ SIM_VCC=1.8V; VSEL=HIGH → SIM_VCC=3V.

VCCA

POWER

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 VCCA is below 1.1V (typical), the VCC_C (SIM Card VCC) is

disabled and FXLP4555 enters Shutdown Mode.

No connect. It is recommended to solder to PCB GND.

VBAT

POWER

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.

VCC_C

POWER

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 VCC_C and

GND. During a normal operation, the VCC_C voltage can be set to 1.8V, followed by a

3.0V value, or can start directly at either of these values.

I/O_C

INPUT/

OUTPUT

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 14k

Ω

(typical) pull-up resistor provides a high-impedance state for the SIM card I/O link.

RST_C

OUTPUT

Connected to the RESET pin of the card connector. A level translator adapts the

external reset (RST) signal to the SIM card.

GND

GROUND

Ground reference for the integrated circuit and associated signals. Care must be

taken to avoid voltage spikes when the device operates in normal operation.

CLK_C

OUTPUT

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 VCC_C.

No connect. It is recommended to solder to PCB GND.

CLK_H

INPUT

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.

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