User Manual

GM47/48 Technical description

BA/SEM/MS 02:0004 Rev B

3.13 Buzzer

Pin Signal Description

31 BUZZER Buzzer Output from module

This is an output signal which allows the application to use pre-

programmed melodies or sounds. Typical use would involve a

transistor buffer with a piezoelectric sounder.

The Dig. 2.75 V CMOS Output electrical characteristics shall apply,

with DGND as the reference.

3.14 LED

Pin Signal Description

33 LED LED Output from module

This is an output signal which allows the use of an external LED. The

LED shall indicate different states within the module.

This signal is a Dig. 2.75 V CMOS output so general characteristics

are applicable. In order to connect a LED in the external application

following scheme shall be followed.

The operation of the LED is hardcoded and is not controlled by the

host application.

Figure 3.5 Electrical connection for led