User Manual

GM47/48 Technical description
BA/SEM/MS 02:0004 Rev B
16
58. SERVICE I 12V/2.7V Flash programming voltage for the MS.
Enable logger information if no flashing
Former VPPFLASH
59. ATMS I Analogue Audio input to module
60. AGND - - Analogue ground
3.2 General Electrical and Logical Characteristics
Many of the signals present in the interface are high-speed CMOS
logic inputs or outputs powered from 2.75 V ± 5 %. Whenever a
signal is defined as Dig. 2.75 V, the following electrical
characteristics shall apply.
Parameter Min. Typ. Max. Output
current I
o
Units
High Level Output Voltage (V
OH
) 2.2 2.75 - 2 mA Volts
Low Level Output Voltage (V
OL
) 0 0.6 2 mA Volts
High Level Input Voltage (V
IH
) 1.93 2.75 Volts
Low Level Input voltage (V
IL
) 0 0.5 Volts
3.2.1 General Protection Requirements
All 2.75V digital inputs shall continuously withstand any voltage from
-0.5V up to 3.47V (3.3V + 5%) in the power-on or power-off
condition with no damage. All 2.75V digital outputs shall
continuously withstand a short circuit to any voltage within the range
from 0V to 3V.
The SIM output signals and the SIMVCC supply shall continuously
withstand a short circuit to any voltage within the range from 0V to
4.1V.
3.3 Grounds
Pins Name Description
2, 4, 6, 8, 10, 12 DGND Digital Ground
60 AGND Analogue Ground