Integration Guide

Rev 1.0 Nov 19 6 41113538
2
2: Power
Power Supply
The host provides power to the AirPrime WP7611 through multiple power and ground
pins. The host must provide safe and continuous power at all times; the module does
not have an independent power supply, or protection circuits to guard against
electrical issues.
For detailed pinout and voltage/current requirements of this module, see the
AirPrime
WP76XX Product Technical Specification
.
Module Power States
The module has four basic power states, as described in
Table 2-1.
Table 2-1: Supported Power States
State Description
Active
Module is fully powered (Linux can be run in the Application Core; modem is on) and
operating in one of the following modes:
• Full function (WWAN radio active; GNSS radio can be turned on/off)—Highest power
consumption.
• Idle mode (WWAN radio on; module is registered on network, but no active
connection; GNSS radio can be turned on/off)
• Airplane mode (WWAN radio off; GNSS radio can be active if allowed by PRI)
• eDRX (Extended Discontinuous Reception)—eDRX mode provides a ‘flexible sleep’
for the modem, which significantly reduces energy consumption.
Sleep
• Lower power consumption than Active state, but higher than PSM.
• Application Core is sleeping; modem is in DRX/eDRX. The processor monitors signals
(triggers) that can ‘wake’ the module.
• Sleep state can be entered based on USB-SS (if USB is connected to the module),
UART_DTR, wake_lock(), configured GPIOs, and QMI exchanges from the modem.
Note: On Windows systems, due to limitations of the Windows ECM driver, Sleep state is
only supported if ECM is disabled or USB is disconnected.
PSM (Power
Saving
Mode)
3GPP Release 12 introduced network support of PSM. PSM allows the module to
negotiate, with the network, an extended period during which registration context with the
network is retained while the module is unreachable. During the negotiated period, the
module enters a very low-power dormant state.
After the specified period, the modem and application processors boot up and the modules
sends a TAU (Tracking Area Update) to the network.
After sending the TAU, the module remains active to allow any pending data to be
exchanged with the network. Then, after a negotiated period of inactivity, the module
automatically returns to PSM to repeat the cycle.
OFF
Module is OFF (no power to the system).
Apply power for system to go to:
• Active state (POWER_ON_N is asserted)
or
• PSM (POWER_ON_N is de-asserted)