11 service/programming, Service/programming – Sony Ericsson GR47/GR48 User Manual
Page 41
5. SYSTEM CONNECTOR INTERFACE
41
LZT 123 7589 R1A
5.10.1 SIM Detection - SIMPRESENCE
SIMPRESENCE is used to determine whether a SIM card has been inserted
into or removed from the SIM card holder. You should normally wire it to
the “card inserted switch” of the SIM card holder, but different
implementations are possible.
When left open, an internal pull-up resistor maintains the signal high and
means “SIM card missing” to the radio device. When pulled low the radio
device assumes a SIM card is inserted.
SIMPRESENCE is a Digital 2.75V CMOS input with the following
electrical characteristics.
1RWH
To meet regulatory approvals SIMPRESENCE must be implemented.
5.11 Service/Programming
When the SERVICE input signal is active the radio device will:
• be reprogrammed if data is received through UART2 from a computer
running Sony Ericsson reprogramming software;
• or it will output logging data on UART2.
SIMDAT
High Level Output
voltage (V
2+
)
3 V
2.7
3.0
V
5 V
4.7
5.0
V
SIMDAT
Low Level Output
voltage (V
2/
)
3 V
0
0.2
V
5 V
0
0.2
V
SIMCLK
SIMRST
High Level Output
voltage (V
2+
)
3 V
2.4
3.0
V
5 V
4.4
5.0
V
SIMCLK
SIMRST
Low Level Output
voltage (V
2/
)
3 V
0
0.35
V
5 V
0
0.3
V
Signal
Parameter
Mode
Min.
Typ.
Max.
Unit
Parameter
Min.
Typ.
Max.
Units
Pull-up resistance (at 2.75 V)
100
k
Ω
Low Level Input voltage (SIM inserted)
0.80
V
High Level Input voltage (SIM missing)
> 1.93
2.75
V
Pin
Signal
Dir
Description
58
SERVICE
I
Flash programming voltage