TOBY-L2 and MPCI-L2 series - System Integration Manual
UBX-13004618 - R28
System description
Page 30 of 164
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, starting from
a voltage value lower than 0.5 V, 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
As described in
, 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
