Signal

 

 

Mode

 

 

Value

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Active High

Minimum input voltage

 

2.5

 

 

 

V

 

 

SERVICE

 

 

Maximum input voltage

 

12.0

 

 

 

V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Inactive Low

Maximum input voltage

0.8

 

 

 

V

There are two methods for updating the firmware in the GR64: Sony Ericsson Emma III and Updater. The Emma III system is a web based tool that accesses a Sony Ericsson server from which signed

NOTE software can be downloaded. The Updater is a local application that downloads a signed image provided by SEMC.

5.13 Buzzer

Pin

 

Name

 

Direction

 

Function

 

 

 

 

 

 

 

31

 

BUZZER

 

Output

 

Buzzer Output

Connecting the BUZZER signal to an inverting transistor-buffer followed by a piezoelectric transducer enables the wireless modem to play pre-programmed melodies or sounds.

5.14 LED

Pin

 

Name

 

Direction

 

Function

 

 

 

 

 

 

 

33

 

LED

 

Output

 

LED control signal

The LED interface is intended to operate a status LED, which can be programmed on and off, or for a particular blink sequence. The LED signal is derived from a standard GPIO and does not have sufficient drive capability to operate an LED directly, so it requires the user to implement some form of transistor circuit. A recommended implementation is shown below.

LZT 123 1834

63