Integration Manual

TSD-19090601 - R15 Contents Page 31 of 143
1.6 System function interfaces
1.6.1 Module power-on
TOBY-L3 series modules can be switched on in the following way:
 Low pulse on the PWR_ON pin, which is normally set high by an internal pull-up, for a valid time period,
when the applied VCC voltage is stable at its nominal value within normal operating range.
As shown in Figure 2, the TOBY-L3 series PWR_ON input is equipped with an internal active pull-up resistor
to an internal 1.3 V supply rail: the PWR_ON input voltage thresholds are different from the other generic
digital interfaces, and the line should be driven by an open drain, by an open collector or by a contact
switch, without an external pull-up resistor.
Detailed electrical characteristics and specifications are described in TOBY-L3 series Data Sheet [1].
Baseband
Processor
20
PWR_ON
TOBY-L3 series
Power-on
Power
Management
Power-on
35k
1.3 V
Figure 2: TOBY-L3 series PWR_ON input description
☞ TOBY-L3 series modules do not switch on by applying the VCC supply only: a low pulse must be forced
on the PWR_ON pin when the VCC voltage is stable at its nominal value within the valid operating
range.