Pin Description - Quectel EC21 Series Hardware Design

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
AI
AO
AIO
DI
DO
DIO
OD
PI
PO
Table 5: Pin Description
Power Supply
Pin Name Pin No.
VBAT_BB 59, 60
EC21_Series_Hardware_Design
Description
Analog Input
Analog Output
Analog Input/Output
Digital Input
Digital Output
Digital Input/Output
Open Drain
Power Input
Power Output
I/O Description
Power supply for
PI module's baseband
part
LTE Standard Module Series
DC
Comment
Characteristics
Vmax = 4.3 V It must be provided
Vmin = 3.3 V with sufficient current
Vnom = 3.8 V up to 0.8 A.
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