LTE-A Module Series
EM121R-GL Hardware Design
EM121R-GL Hardware Design 55 / 80
Host
Module
CONFIG_0
CONFIG_1
CONFIG_2
CONFIG_3
GPIO
GPIO
GPIO
GPIO
21
69
75
1
VCC_IO_HOST
R1
100K
R2
100K
R3
100K
R4
100K
0
Ω
NM-0
Ω
NM-0
Ω
0
Ω
Note:
The voltage level VCC_IO_HOST depends on the host side, and could be a 1.8 V or 3.3 V
voltage level.
Figure 31: Recommended Circuit of EM121R-GL Configuration Pins