Quectel EG21-G - U)SIM Interface

LTE Module Series
EG21-G Hardware Design
EG21-G_Hardware_Design 38 / 100
V
IL
≤0.5V
V
IH
≥1.3V
VBAT
≥150ms
Resetting
Module
Status
Running
RESET_N
Restart
≤460ms
Figure 16: Timing of Resetting Module
1. Use RESET_N only when failed to turn off the module by AT+QPOWD command and PWRKEY pin.
2. Ensure that there is no large capacitance on PWRKEY and RESET_N pins.
3.9. (U)SIM Interface
The (U)SIM interface circuitry meets ETSI and IMT-2000 requirements. Both 1.8V and 3.0V (U)SIM cards
are supported.
Table 9: Pin Definition of (U)SIM Interface
Pin Name
Pin No.
I/O
Description
Comment
USIM_VDD
14
PO
Power supply for (U)SIM card
Either 1.8V or 3.0V is supported
by the module automatically.
USIM_DATA
15
IO
Data signal of (U)SIM card
USIM_CLK
16
DO
Clock signal of (U)SIM card
USIM_RST
17
DO
Reset signal of (U)SIM card
USIM_
PRESENCE
13
DI
(U)SIM card insertion detection
1.8V power domain.
If unused, keep it open.
USIM_GND
10
Specified ground for (U)SIM
card
EG21-G supports (U)SIM card hot-plug via the USIM_PRESENCE pin. The function supports low level
NOTES