Motorola Mobility LLC T56KT1 User Manual
Chapter 2: Hardware Interface Description
December 15, 2009
G30 - Module Hardware Description
15
Power On/Off Operation
The G30 power on and off process includes two primary phases, which are indicated at the
interface connector by the hardware input signal RESET_IN, and the output signal CTS.
interface connector by the hardware input signal RESET_IN, and the output signal CTS.
The RESET_IN is usually an input signal to the G30, and its main function is to initiate HW reset
to the G30. However, this signal can also serve as "live indication" signal, and indicate whether
G30 is powered on or off.
to the G30. However, this signal can also serve as "live indication" signal, and indicate whether
G30 is powered on or off.
Note:
When RESET_IN is used as "Live Indication", verify that the signal is connected to an
input device (via a input buffer), with NO pull-up or pull-down resistors.
input device (via a input buffer), with NO pull-up or pull-down resistors.
When this signal is enabled (low), G30 is powered-off. When it is disabled (high), G30 is
powered-on.
powered-on.
The CTS signal indicates the serial communications interface (UART) status. When this signal is
high, the G30 serial interface is disabled. When it is low, the serial interface is enabled, and G30
is ready to communicate.
high, the G30 serial interface is disabled. When it is low, the serial interface is enabled, and G30
is ready to communicate.
When G30 is powered on, and after the CTS is enabled (Low), The G30 initiates an unsolicited
"Wait...At command Ready" massage via the UART serial interface, followed by "+PBREADY"
massage (once all G30 internal tests are done).
"Wait...At command Ready" massage via the UART serial interface, followed by "+PBREADY"
massage (once all G30 internal tests are done).
For more information, refer to
"G30 AT Commands Reference Manual, P/N 6802986C33"
.
Important:
Applying voltage to ADC lines before power up is forbidden and may cause G30
power up issues.
power up issues.
Important:
Do not operate the G30 out of its electrical or environmental limits. Refer to the
specifications chapter for details of these limits.
specifications chapter for details of these limits.
Turning the G30 On
When the G30 power supply is stable above the minimum operating level and G30 is powered
off, only the internal RTC timer is active.
off, only the internal RTC timer is active.
When G30 is turned on, by any of the methods described below, it will first perform an automatic
internal system-test, during which basic functions are verified. The system-test duration is
typically 1600 milliseconds. When the system-test has completed G30 resumes normal operation.
internal system-test, during which basic functions are verified. The system-test duration is
typically 1600 milliseconds. When the system-test has completed G30 resumes normal operation.
During the internal system-test process G30 may toggle several interface signals, which are
visible to the application. These signals do not represent any valid state or data, and should be
ignored by the customer application until the system-test has completed.
visible to the application. These signals do not represent any valid state or data, and should be
ignored by the customer application until the system-test has completed.
Power Supply Turn-on
When connecting the power supply for the first time, or when reconnecting it after a power
supply loss, G30 will power-on. The G30 is turned-on automatically when external power is
applied above the minimum operating level.
supply loss, G30 will power-on. The G30 is turned-on automatically when external power is
applied above the minimum operating level.