FXLA2203 Datasheet, PDF (9/16 Pages) Fairchild Semiconductor – Dual-Mode, Dual-SIM-Card Level Translator

Application Information
Figure 9 illustrates an FXLA2203 used in a dual-mode /
dual-SIM application. The FXLA2203 does not contain
any internal LDOs. Instead, the FXLA2203 architecture
HOST PORT
HOST 1
WCDMA
TDSCDMA
1.8V / 3V
PMIC
LDO 1
0.1µF
1.8V / 3V
VCC H_1
VCC1
RST_H_1
CLK_H_1
I/O_H_1
HOST 2
GSM
Control Can
Be Either Host
CH_Swap
EN
I/O_H_2
CLK_H_2
RST_H_2
PMIC
LDO 2
1.8V / 3V _VCC2
0.1µF
1.8V / 3V
1.8V / 3V
0.1µF
VCC_H_2
VCC
incorporates two low-R_ON internal power switches for
routing existing Power Management Integrated Circuit
(PMIC) LDOs to individual SIM slot VCC pins.
CARD PORT
RST_1
CLK_1
I/O_1
VCC_Card1
GND
VCC_ Card2
I/O_2
CLK_2
RST_2
RST
CLK _{SIM Slot 1}
I/O
1.8V / 3V
VCC
0.1µF
GND
0.1µF
VCC
I/O
CLK
RST
SIM Slot 2
1.8V / 3V
GND
Figure 9. Typical Dual-Mode Application
CH_Swap Truth Table
CH_Swap controls simultaneous communication between Host
1 or Host 2, and either SIM Card according to Table 2 —
Dual-Mode, Dual-SIM Truth Table. Either host can swap
SIM slots (130ns typical) with the assertion of the
CH_Swap pin. This simple solution is faster and less
complicated than SPI or I²C communication protocols.
© 2010 Fairchild Semiconductor Corporation
FXLA2203 • Rev. 1.0.5
Figure 10. CH_Swap
9
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