Fastrack Supreme User Guide
Technical Characteristics
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Page: 66 / 77
Table 22: Recommended characteristics for the speaker:
Feature
Value
Type
10 mW, electro-magnetic
Impedance
Z = 32 to 50
Ω
Sensitivity
110 dB SPL min. (0 dB = 20 µPa)
Frequency response
compatible with the GSM specifications
8.2.4
General Purpose Input/Output
Both GPIO21 and GPIO25 may be interfaced with a component that comply with 3 Volts CMOS levels.
Table 23: Operating conditions
Parameter
I/O type
Min
Typ
Max
Condition
V
IL
CMOS
0.84
V
V
IH
CMOS 1.96
V
V
OL
CMOS 0.4
V
I
OL
= -4 mA
V
OH
CMOS 2.4
V
I
OH
= 4 mA
I
OH
4mA
I
OL
-4mA
Clamping diodes are present on I/O pads.
8.2.5
SIM Interface
Table 24: SIM card characteristics
SIM card
1.8V / 3 V
8.2.6
RESET Signal
Table 25: Electrical characteristics
Parameter
Min
Typ
Max
Unit
Input Impedance ( R )*
330K
k
Ω
Input Impedance ( C )
10n
nF
*Internal pull-up
