Sierra Wireless AirPrime SL808 Series, Product Technical Specification & Customer Design Manuallines, Page: 66 / 122

Product Technical Specification & Customer Design Guidelines
66 Proprietary and Confidential - Specifications subject to change 2400058
5.2 Power on/off signal (POWER_ON_N)
This signal is used to switch the AirPrime SL808X Embedded Module ON or OFF.
5.2.1 Pin descriptions
Table 5-3 describes the POWER_ON_N signal pins.
See Digital I/O electrical information on page 39 for 1V8 voltage characteristics
and reset state definitions.
5.2.2 Electrical characteristics
Caution: All external signals must be inactive when the AirPrime SL808X Embedded
Module is OFF to avoid any damage when starting and to allow the embedded module to
start and stop correctly.
Refer to Table 4-2 on page 34 for basic characteristics (type, voltage).
5.2.3 Application notes
Caution: This section is under review and subject to change.
5.2.3.1 Procedure: Power on/off
To power on the modem, the host must:
1. Apply input voltage within valid range to power-supply pins. (See Table 3-1 on
page 25 for Vcc range.)
Table 5-2: Power signal features
Feature Details
Purpose Power on/off
•
Simulates a power button.
Implementation
•
Low = On
•
Digital input
•
Line should be driven only by an open-drain output from the
host
•
Level is internally pulled up to 2.6 V
Table 5-3: ON/~OFF signal pin description
Pin Signal I/O I/O type Description
43
POWER_ON_N I CMOS Embedded module
power-on