Figure 30: Reference Circuit Of The 8-Pin Usim Card - Quectel UC15 Hardware Design

USIM_CLK 14
USIM_RST 15
USIM_
11
PRESENCE
USIM_GND 8
The following figure shows the reference design of the 8-pin USIM card.
USIM_GND
USIM_VDD
USIM_RST
Module
USIM_CLK
USIM_PRESENCE
USIM_DATA
NOTE
Some AT commands are invalid when USIM card is not applied.
UC15 supports USIM card hot-plugging via the USIM_PRESENCE pin. For details, refer to document [1]
about the command AT+QSIMDET. If you do not need the USIM card detection function, keep
USIM_PRESENCE unconnected. The reference circuit for using a 6-pin USIM card holder is illustrated as
the following figure.
UC15_Hardware_Design
DO Clock signal of USIM card.
DO Reset signal of USIM card.
DI USIM card detection input.
Specified ground for USIM card.
VDD_EXT USIM_VDD
51K
22R
22R
22R
33pF 33pF 33pF

Figure 30: Reference Circuit of the 8-Pin USIM Card

Confidential / Released
15K
100nF
GND GND
UMTS/HSDPA Module Series
UC15 Hardware Design
2.6V power domain
USIM holder
VCC GND
RST VPP
CLK
ESDA6V8AV6
IO
GND
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