LTE Standard Module Series
EC21_Series_Hardware_Design
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function pins. Bluetooth function is under development.
5. Pins 119–126 and pin 128 are used for SGMII interface.
6. Pins 24–27 for PCM function are used for audio design on EC21 series module and Bluetooth
function on FC20 series/FC21 modules.
7. Keep all RESERVED pins and unused pins unconnected.
8. GND pins 85–112 should be connected to ground in the design. RESERVED pins 73–84 should not
be designed in schematic and PCB decal, and these pins should be served as a keepout area.
3.3. Pin Description
The following tables show the pin definition of EC21 series module.
Table 4: I/O Parameters Definition
Type Description
AI Analog Input
AO Analog Output
AIO Analog Input/Output
DI Digital Input
DO Digital Output
DIO Digital Input/Output
OD Open Drain
PI Power Input
PO Power Output
Table 5: Pin Description
Power Supply
Pin Name Pin No. I/O Description
DC
Characteristics
Comment
VBAT_BB 59, 60 PI
Power supply for
module’s baseband
part
Vmax = 4.3 V
Vmin = 3.3 V
Vnom = 3.8 V
It must be provided
with sufficient current
up to 0.8 A.
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