Motorola Mobility LLC T56KT1 User Manual

When implementing a single ended loudspeaker design, it is required to place a 
series capacitor and resistor on the alert output line, as illustrated in 

.

The capacitor should be of low tolerance with values of C = 10-22 uF.
The resistor value should be R = 0

Ω

 at the design stage, but may be changed to a 

different value during audio safety testing, in case that alert level limitation is 
required.

The G30 operates by default in the basic audio mode with the differential speaker (handset) audio 
path, for DTMF tones, speech, rings, and alert tones active.

The headset (mono speaker) path is an alternate audio path in basic mode. It is designed for, but 
not limited to, a personal hands-free audio device, a headset, using the headset microphone input 
device and the headset speaker output device. When this path is selected, the differential speaker 
is disabled, and all the audio sounds are passed through to the headset path.

The HDST_INT signal is used to switch between handset and headset audio paths in basic audio 
mode. This signal is set high by default at power up. Asserting the HDST_INT signal low enables 
the headset audio path and disables the handset path. Setting this signal high will disable the 
headset path and enable the handset path.

The G30 supports dynamic switching between the handset and headset audio paths, during 
operation and call handling.

The HDST_INT signal does not operate in advanced audio mode. This signal's 
functionality is overridden by the AT+MAPATH command settings.

Output Volt-
age

No load
Single ended

TBD

V

PP

Gain

Programmable in 
3 dB steps

-18

0

dB

AC Output 
Impedance

32

Ω

DC Voltage

TBD

V

THD

32 Ω load
300 Hz - 4 kHz

1

%

Isolation

60

dB