Usb And Sleep; Uart And Sleep; Module Wake-Up - Huawei MU609 Application Manual

HUAWEI MU609 HSPA LGA Module
Application Guide

10.3.2 USB and Sleep

USB is an important communication channel between the module and the host.
According to the USB protocol, normally a hub or a root hub periodically sends Start
of Frame (SOF) data packages (one data package per ms using full-speed USB and
one package per 125 µs using high-speed USB). Through this mechanism, USB
always votes to stop the module from entering sleep mode.
When the USB driver provided by Huawei detects that the module and the host have
not exchanged data in 5 seconds, the USB driver will enable the port's suspend
feature, stopping SOF data packages being sent and suspending the USB controller.
This enables the USB to vote to agree the module's sleep.
Note:

10.3.3 UART and Sleep

UART is an important communication channel between the module and the host. If
the host uses UART (a TTL level Interface), it can connect to the module's UART
directly. If the host uses RS232, it can connect to the module's UART through a
conversion chip such as MAX232.
Note:

10.3.4 Module Wake-up

RF periodically wakes up the module based on the DRX cycle (depending on the
actual configuration of the network system), as shown in Figure 10-4 .
Other aperiodic events include:
1.
2.
3.
4.
Issue 02 (2013-09-18)
If the USB driver used is developed by users or is integrated with external application, ensure
that the USB driver supports the USB suspend features (including selective suspend and
global suspend, as defined in the USB standard.)
Regardless of the connection modes, when there is no data transmitted on the UART, the host
should set the RX pin of the module's UART to low level so that the module can enter sleep
mode.
The host sends data using USB/UART or pulls WAKEUP_IN up.
Changes on the network, for example, an incoming call, an incoming text
message, a signal change, a network working mode change, a network search,
an IP data package (when a dial-up network connection is set up).
Software system events such as a timer
Abnormal events, for example, an antenna drops or a SIM card becomes loose.
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Sleeping and Waking Up Application Scenarios
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