Logic Levels; Leakage Current For Cmos Signals; Validity Of Cmos Signals; Power Supply - Wavecom CM52 Integrator's Manual

Logic Levels

2.3.3
Many of the signals present in the interface are CMOS signals where the following levels apply.
The nominal voltage level for the CMOS signals is 2.9 V. Drive capability of the outputs is also
indicated.
Parameter
High level output voltage (I
Low level output voltage (I
High level input voltage
Low level input voltage
Note: The maximum voltage that may be applied to any CMOS signal is 3.1V
2.3.3.1

Leakage Current for CMOS Signals

The following table defines the maximum leakage for the CMOS inputs of the CM52.
Parameter
High level drive for input signal with internal pull down
Low level drive for input signal with internal pull up
2.3.3.2

Validity of CMOS signals

The CMOS signals of the CM52 shall only be considered valid when the level of the VREF signal is
above 2.3V.
2.4

Power Supply

The CM52 requires a dual DC power supply implementation in the application. VCC_MAIN provides
power to the entire radio while VCC_AUX provides power for the 3-Watt functionality and biasing
for the RF switches.
Note: VCC_AUX must be present if the 3W option is provided even if it is not used. If the 3W
circuitry is not populated then VCC_AUX is not required or may be bussed together with
VCC_MAIN.
3
DTR is 90 uA and HW_SD is 350 uA
CM52 Integrators' Manual
WI_DEV_CM52_UGD_001-001
Page 21 of 53
= 800 µA)
OH
= 800 µA)
OL
Table 4: CMOS Output / Input Electrical Characteristics
Table 5: Maximum Leakage Current for CMOS signals
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Test Limits
Conditions
Min
V 2.45
OH
V 0
OL
V 1.9
IH
V 0
IL
Max
60
3
60
CM52 Integrators' Manual
Units
Max
3.1 Volts
0.45 Volts
3.1 Volts
0.9 Volts
Units
uA
uA