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Ublox SARA-G450 Series User Manual

Ublox SARA-G450 Series
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SARA-G450 - System integration manual
UBX-18046432 - R08 Design-in Page 98 of 143
C1-Public
2.6.2 Secondary auxiliary serial interface (AUX UART)
ā˜ž Secondary auxiliary UART interface is not supported by the ā€œ00ā€ product version. This interface
should be left unconnected and should not be driven by external devices.
2.6.2.1 Guidelines for AUX UART circuit design
If RS-232 compatible signal levels are needed, the Maxim 13234E voltage level translator can be used.
This chip translates voltage levels from 1.8 V / 3.0 V (module side) to the RS-232 standard.
If a 1.8 V application processor (DTE) is used and module (DCE) generic digital interfaces are
configured to operate at 1.8 V (V_INT = 1.8 V, if VSEL pin is connected to GND; see 1.5.3), the circuit
should be implemented as described in Figure 59.
TxD
Application Processor
(1.8V DTE)
RxD
GND
SARA-G450
(1.8V DCE)
17
TXD_AUX
19
RXD_AUX
GND
21
VSEL
Figure 59: AUX UART application circuit (1.8 V DTE / 1.8 V DCE)
If a 3.0 V application processor (DTE) is used and module (DCE) generic digital interfaces are
configured to operate at 3.0 V (V_INT = 3 V, if VSEL pin is left unconnected; see 1.5.3), the circuit
should be implemented as described in Figure 60.
TxD
Application Processor
(3.0V DTE)
RxD
GND
SARA-G450
(3.0V DCE)
17
TXD_AUX
19
RXD_AUX
GND
21
VSEL
Figure 60: AUX UART application circuit (3.0 V DTE / 3.0 V DCE)
If a 3.0 V application processor (DTE) is used and module (DCE) generic digital interfaces are
configured to operate at 1.8 V (V_INT = 1.8 V, if VSEL pin is connected to GND; see 1.5.3), then it is
recommended to connect the 1.8 V AUX UART interface of the module (DCE) by means of appropriate
unidirectional voltage translators using the module V_INT output as the 1.8 V supply for the voltage
translators on the module side, as described in Figure 61.

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Ublox SARA-G450 Series Specifications

General IconGeneral
BrandUblox
ModelSARA-G450 Series
CategoryGSM/GPRS Modules
LanguageEnglish