ALT1210MOD-VZ-01 User Module
Rev 1.0
Altair Semiconductor Proprietary and Confidential
15
4.2.
Power up and Power Down Sequences
The ALT1210MOD-VZ-
01 module has a “Shutdown”
control input (pin #81), that
actually shutdowns the integrated supplies inside the module when asserted high.
The proper power up sequence would be:
•
Shutdown pin is kept high (to prevent the system to boot up before the DDR
voltage is available)
•
1.8V_IO_IN and VDD_RET_IN should be applied (1.8V_IN should be
available before applying any external signal to the module pins (not
including the shutdown pin)
•
VBAT should be applied
•
VPA is applied (if it is not controlled by the modem itself)
•
Shutdown pin is set low
This Flow ensures that all power supplies are stable before the shutdown pin is set
low and the system boots up.
The proper power down sequence would be the opposite:
•
Shutdown pin is set high (shutting the modem internal supplies and
modem)
•
VPA shutdown (if it is not controlled by the modem itself)
•
VBAT is shut down
•
1.8V_IO_IN and VDD_RET_IN are shut down
4.3.
Specific Interfaces Guidelines
The module has multiple interfaces allowing it to be used for a very wide variety of
applications. The following sections provide some detailed explanation on how to
connect and use these interfaces.
4.3.1.
RF (Pin #36)
The ALT1210MOD-VZ-01 has a single RX/TX antenna pad. This pad should be
connected to the device antenna (dual band 4,13 antenna) through a 50ohm
impedance trace.
It is very important to keep this trace as short as possible to reduce extra loss and
away from any noisy circuits on the application board to avoid any degradation in
the module sensitivity performance.