fxla2203 Fairchild Semiconductor, fxla2203 Datasheet - Page 13

• Manufacturer Part Number: fxla2203
• Description: Fxla2203 Dual-mode, Dual-sim-card Level Translator
• Manufacturer: Fairchild Semiconductor

© 2010 Fairchild Semiconductor Corporation
FLXA2203 • Rev. 1.0.1
Operation Description
Table 5. Power Supply Pins
The control pins EN and CH_Swap reference V
can range from 1.65V to 3.6V and is independent from
the other four power pins; however, V
higher or equal to VCC1 and VCC2.
VCC_Host_1 and VCC_Host_2 can independently
range from 1.65V to 3.6V and are the power supply pins
for their respective host-side interfaces; including RST,
I/O, and CLK.
VCC1 and VCC2 can independently range from 1.65V to
3.6V and are the inputs to the internal power switches.
VCC1 and VCC2 should be connected to external PMIC
LDOs. Depending on the logic state of the CH_Swap
and EN control pins, the external LDOs are routed
through the two power switches to either VCC_Card1 or
VCC_Card2 (see Table 6). Meanwhile, CH_Swap also
routes the host (1 or 2) signal pins; RST, I/O, and CLK
to the SIM Slot side (1 or 2). See section “SIM Slot
Signals: Active vs. 3-State” for details. The voltage
reference of each SIM slot is determined by the LDO
voltage assigned to that SIM slot.
RST and CLK are unidirectional pins always going in the
SIM slot direction. I/O is a bi-directional, open drain pin.
Internal 10K pull-up resistors are provided.
The ISO7816 standard identifies an algorithm that
allows a Host device to auto-detect the operating
voltage of a SIM card. The algorithm is called “class
selection” and the FXLA2203 is 100% transparent to
class selection.
If VCC1 and VCC_H_1 share the same voltage
potential; these two pins can be tied together. Likewise,
if VCC2 and VCC_H_2 share the same voltage
Table 6. Power Switch Truth Table
Table 7. Signal Truth Table
Pin
0V – 3.6V
0V – 3.6V
10
EN
6
7
8
9
1
1
VCC1
VCC_H_1
VCC_H_2
Name
VCC1
VCC2
VCC
CH_Swap
0V – 3.6V
0V – 3.6V
1
0
VCC2
EN and CH_Swap Supply
Power Switch 1 Input
Power Switch 2 Input
CLK_H_1, RST_H_1, and I/O_H_1
CLK_H_2, RST_H_2, and I/O_H_2
Host 1 Supply
Host 2 Supply
CC
Function
EN
1
1
must always be
SIM SLOT 1
CC
CH_Swap
. V
CC
1
0
13
potential, these two pins can be tied together. Under
these conditions, and once CH_Swap has been
established, the host can power up or down the SIM
card along with the FXLA2203 host side solely by the
LDO voltage. This feature is a convenient method for
conserving power. Note that V
equal to or greater than V
The FXLA2203 I/O pins must be driven by open-drain
drivers on the host sides and the card sides.
SIM Slot Power Switch Truth Table
If EN=1 and CH_Swap=1; then the V
(VCC_Card_1) tracks the VCC1 voltage (ext. LDO),
while the V
VCC2 voltage (ext. LDO). If EN=1 and CH_Swap=0;
then the V
VCC2 voltage (ext. LDO), while the VCC of SIM Slot 2
(VCC_Card_2) tracks the VCC1 voltage (ext. LDO). See
Table 7. Note that V
SIM Slot Signal Truth Table
If EN=1 and CH_Swap=1, the Host 1 Input signal pins
(CLK_H_1, RST_H_1, and I/O_H_1) are translated to
the SIM Slot 1 output signal pins (CLK_1, RST_1, and
I/O_1). The VCC1 voltage (ext. LDO) sets the voltage
levels of CLK_1, RST_1, and I/O_1. Host 2 input signal
pins (CLK_H_2, RST_H_2, and I/O_H_2) are translated
to the SIM Slot 2 output signal pins (CLK_2, RST_2, and
I/O_2). The VCC2 (ext. LDO) voltage sets the voltage
levels of CLK_2, RST_2 and I/O_2.
If EN=1 and CH_Swap=0, the Host 1 input signal pins
(CLK_H_1, RST_H_1 and I/O_H_1) is translated to the
SIM Slot 2 output signal pins (CLK_2, RST_2, and
I/O_2). The VCC1 voltage (ext. LDO) sets the voltage
levels of CLK_2, RST_2, and I/O_2. Host 2 input signal
pins (CLK_H_2, RST_H_2, and I/O_H_2) are translated
to the SIM Slot 1 output signal pins (CLK_1, RST_1, and
I/O_1). The VCC2 (ext. LDO) voltage sets the voltage
levels of CLK_1, RST_1, and I/O_1.
VCC_Card 1
CC
CC
of SIM Slot 1 (VCC_Card_1) tracks the
of SIM Slot 2 (VCC_Card_2) tracks the
VCC1
VCC2
CLK_H_2, RST_H_2, and I/O_H_2
CLK_H_1, RST_H_1, and I/O_H_1
CC
must be > V
CC1
SIM Slot 2
and V
CC
CC1
CC2
must always remain
VCC_Card 2
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.
and V
CC
VCC2
VCC1
of SIM Slot 1
CC2
.