Product Info

LTE Module Series
EG61-NA Hardware Design
EG61-NA_Hardware_Design 39 / 77
USIM_GND 47 Specified ground for (U)SIMcard
USIM2_VDD 87 PO Power supply for (U)SIM2 card
Either 1.8V or 3.0V is
supported by the module
automatically.
USIM2_DATA 86 IO Data signal of (U)SIM2 card
USIM2_CLK 84 DO Clock signal of (U)SIM2 card
USIM2_RST 85 DO Reset signal of (U)SIM2 card
USIM2_
PRESENCE
83 DI (U)SIM2 card insertion detection
EG61-NA supports (U)SIMcard hot-plug via the USIM_PRESENCE
(USIM1_PRESENCE/USIM2_PRESENCE) pin. The functionsupports low level and high level detections,
andis disabled by default. Pleaserefer to document [2] about AT+QSIMDETcommand for details.
The following figure shows a reference design for (U)SIM interface with an8-pin (U)SIMcard connector.
Module
USIM_VDD
USIM_GND
USIM_RST
USIM_CLK
USIM_DATA
USIM_PRESENCE
0R
0R
0R
VDD_EXT
51K
100nF
GND
GND
33pF
33pF 33pF
VCC
RST
CLK
IO
VPP
GND
GND
USIM_VDD
15K
(U)SIM Card Connector
Figure 17: Reference Circuitof (U)SIMInterface with an 8-Pin (U)SIMCard Connector
If (U)SIM card detection function is not needed, please keep USIM_PRESENCE unconnected.
Areference circuit of (U)SIM interface with a 6-pin (U)SIMcard connector is illustrated inthe following
figure.