Pin Description - Quectel EC21 Series Hardware Design

module.
6. Keep all RESERVED pins and unused pins unconnected.
7. GND pads 85~112 should be connected to ground in the design, and RESERVED pads 73~84
should not be designed in schematic and PCB decal.
※
" " means these interface functions are only supported on Telematics version.
8.

3.3. Pin Description

The following tables show the pin definition of EC21 module.
Table 3: I/O Parameters Definition
Type
IO
DI
DO
PI
PO
AI
AO
OD
Table 4: Pin Description
Power Supply
Pin Name Pin No.
VBAT_BB 59, 60
VBAT_RF 57, 58
EC21_Hardware_Design
Description
Bidirectional
Digital input
Digital output
Power input
Power output
Analog input
Analog output
Open drain
I/O Description
Power supply for
PI module baseband
part
Power supply for
PI
module RF part
Confidential / Released
DC Characteristics
Vmax=4.3V
Vmin=3.3V
Vnorm=3.8V
Vmax=4.3V
Vmin=3.3V
Vnorm=3.8V
LTE Module Series
EC21 Hardware Design
Comment
It must be able to provide
sufficient current up to
0.8A.
It must be able to provide
sufficient current up to
1.8A in a burst
transmission.
19 / 94