FXLA2203 Datasheet, PDF (10/16 Pages) Fairchild Semiconductor – Dual-Mode, Dual-SIM-Card Level Translator

Table 2. Dual-Mode, Dual-SIM Truth Table
Enable
1
1
1
1
CH_SWAP
1
1
0
0
Configuration
Host 1  SIM Slot 1
Host 2  SIM Slot 2
Host 1  SIM Slot 2
Host 2  SIM Slot 1
Voltage Translation Description
The FXLA2203 provides full voltage translation, or level
shifting, from 1.65V – 3.6V between Host 1 or Host 2
and either SIM card (according to Table 3). The host
sides reference V_{CC_H_1} and V_{CC_H_2}, respectively, while
each SIM slot references the external PMIC LDO
voltage level determined by the CH_Swap pin. This
architecture offers a flexible solution for problematic V_CC
domain disagreements. For example, if Host 1 operates
at 1.65V and Host 2 operates at 2.5V, while slot 1 is
populated with a 3.0V SIM card and slot 2 is populated
with a 1.8V SIM card, the FXLA2203 provides seamless
voltage translation across all four V_CC domains.
Figure 11. Voltage Translation
Table 3. Translation Truth Table
Enable
CH_Swap
SIM Slot 1 Voltage Levels
1
1
1
0
PMIC LDO1 / V_CC1
PMIC LDO2 / V_CC2
Note:
22. V_CC must always be greater than or equal to (≥) V_CC1 and V_CC2.
SIM Slot 2 Voltage Levels
PMIC LDO2 / V_CC2
PMIC LDO1 / V_CC1
© 2010 Fairchild Semiconductor Corporation
FXLA2203 • Rev. 1.0.5
10
www.fairchildsemi.com