Sony Ericsson GR47/GR48 Manuale Utente

5. SYSTEM CONNECTOR INTERFACE

22

LZT 123 7589 R1A

Many of the signals, as indicated in the table above, are high-speed CMOS 
logic inputs or outputs powered from a 2.75 V ± 5 % internal voltage 
regulator, and are defined as Digital 2.75 V. Whenever a signal is defined 
as Digital 2.75 V, the following electrical characteristics apply.

Unused pins can be left floating.

• All 2.75 V digital inputs will continuously withstand and suffer no 

damage in the power-on or power-off condition when subjected to any 
voltage from - 0.5 V to 3.47 V (3.3 V + 5 %).

• All 2.75 V digital outputs will continuously withstand a short circuit to 

any other voltage within the range 0 V to 3 V.

• All analogue outputs will continuously withstand a short circuit to any 

voltage within the range 0 V to 3 V.

49

PCMO

O

Digital 2.75V

Codec PCM digital audio output

50

PCMI

I

Digital 2.75V

Codec PCM digital audio input

51

PCMSYNC

O

Digital 2.75V

DSP PCM frame sync

52

PCMCLK

O

Digital 2.75V

DSP PCM clock output

53

MICP

I

Analogue

Microphone Input positive

54

MICN

I

Analogue

Microphone Input negative

55

BEARP

O

Analogue

Speaker output positive 

56

BEARN

O

Analogue

Speaker output negative

57

AFMS

O

Analogue

Audio output from radio device

58

SERVICE

I

2.7V

Flash programming voltage for the MS. 

Enable logger information if not 

flashing.

59

ATMS

I

Analogue

Audio input to radio device

60

AGND

-

Analogue

Analogue ground

High Level Output Voltage (V

OH

), I

o 

 =  –2mA

2.2

2.75

V

Low Level Output Voltage (V

OL

), I

o 

= 2mA

0

0.6

V

High Level Input Voltage (V

IH

)

1.93

2.75

V

Low Level Input voltage (V

IL

)

0

0.5

V