TOBY-L2 and MPCI-L2 series - System Integration Manual
UBX-13004618 - R07
Advance Information
System description
Page 30 of 158
1.6
System function interfaces
1.6.1
Module power-on
The
PWR_ON
input pin is not available on MPCI-L2 series modules.
When the TOBY-L2 and MPCI-L2 series modules are in the not-powered mode (switched off, i.e. the
VCC
or
3.3Vaux
module supply is not applied), they can be switched on as following:
Rising edge on the
VCC
or
3.3Vaux
supply input to a valid voltage for module supply, so that the module
switches on applying a proper
VCC
or
3.3Vaux
supply within the normal operating range.
Alternately, the
RESET_N
or
PERST#
pin can be held to the low level during the
VCC
or
3.3Vaux
rising
edge, so that the module switches on releasing the
RESET_N
or
PERST#
pin when the
VCC
or
3.3Vaux
module supply voltage stabilizes at its proper nominal value within the normal operating range.
The status of the
PWR_ON
input pin of TOBY-L2 modules while applying the
VCC
module supply is not relevant:
during this phase the
PWR_ON
pin can be set high or low by the external circuit.
When the TOBY-L2 modules are in the power-off mode (i.e. switched off with valid
VCC
module supply applied),
they can be switched on as following:
Low level on the
PWR_ON
pin, which is normally set high by an internal pull-up, for a valid time period.
Low level on the
RESET_N
pin, which is normally set high by an internal pull-up, for a valid time period.
RTC alarm, i.e. pre-programmed alarm by AT+CALA command (see
u-blox AT Commands Manual
[3]).
As described in Figure 13, the TOBY-L2 series
PWR_ON
input is equipped with an internal active pull-up resistor
to the
VCC
module supply: the
PWR_ON
input voltage thresholds are different from the other generic digital
interfaces. Detailed electrical characteristics are described in
TOBY-L2 series Data Sheet
Baseband
Processor
20
PWR_ON
TOBY-L2 series
VCC
Power-on
Power
Management
Power-on
50k
Figure 13: TOBY-L2 series PWR_ON input description