Integration Manual

TOBY-L2 and MPCI-L2 series - System Integration Manual

UBX-13004618 - R04 Advance Information System description

Page 29 of 141

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 [1].

Baseband

Processor

PWR_ON

TOBY-L2 series

VCC

Power-on

Power

Management

Power-on

50k

Figure 13: TOBY-L2 series PWR_ON input description

For more pin information and electrical characteristics, see the TOBY-L2 Data Sheet [1] and MPCI-L2 Data

Sheet [2].