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FXLP4555 Datasheet(PDF) 3 Page - Fairchild Semiconductor |
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FXLP4555 Datasheet(HTML) 3 Page - Fairchild Semiconductor |
3 / 13 page © 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com FXLP4555 • Rev. 1.0.0 3 Pin Configuration 16 15 14 13 1 2 3 4 12 11 10 9 8 7 6 5 FXLP4555 Exposed DAP (GND) EN VSEL VCCA NC RST_C GND CLK_C NC Figure 3. Pin Assignments (Top View) Pin Definitions Pin Name Type Description 1 EN 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. 2 VSEL INPUT The signal present on this pin programs the SIM_VCC value: VSEL=LOW → SIM_VCC=1.8V; VSEL=HIGH → SIM_VCC=3V. 3 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. 4 NC No connect. It is recommended to solder to PCB GND. 5 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. 6 NC No connect. It is recommended to solder to PCB GND. 7 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. 8 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 14kΩ (typical) pull-up resistor provides a high-impedance state for the SIM card I/O link. 9 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. 10 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. 11 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. 12 NC No connect. It is recommended to solder to PCB GND. 13 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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