FXLP4555MPX Datasheet, PDF (4/13 Pages) Fairchild Semiconductor – 1.8V / 3.0V SIM Card Power Supply and Level Shifter

Pin Definitions (Continued)
Pin Name Type
Description
14 RST_H
INPUT
The RESET signal present at this pin is connected to the SIM card through the
internal level shifter, which translates the level according to the V_{CC_C} programmed
value.
15
I/O_H
INPUT/
OUTPUT
This pin is connected to the baseband. A bidirectional level translator adapts the serial
I/O signal between the smart card and the baseband. A built-in constant 18kΩ (typical)
resistor provides a high-impedance state when not activated.
16
NC
No connect. It is recommended to solder to pcb GND.
17
Exposed
DAP
Ground Must be soldered to PCB ground plane.
© 2010 Fairchild Semiconductor Corporation
FXLP4555 • Rev. 1.0.0
4
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