GSM/GPRS/GNSS Module Series
MC60 Series Hardware Design
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200mm as possible.
Keep (U)SIM card signals away from RF and VBAT traces.
Assure the ground between module and (U)SIM card connector short and wide. Keep the width of
ground no less than 0.5mm to maintain the same electric potential. The decouple capacitor between
SIM_VDD and GND should be not more than
1μF and be placed close to the (U)SIM card connector.
To avoid cross talk between SIM_DATA and SIM_CLK, keep them away from each other and shield
them with surrounded ground.
In order to offer good ESD protection, it is recommended to add a TVS diode array whose parasitic
capacitance should be not more than 50pF. Place the ESD protection device as close as possible to
the (U)SIM card connector, and make sure the (U)SIM card signal lines go through the ESD
protection device first from (U)SIM card connector and then connect to the module. The 22
Ω resistors
should be connected in series between the module and the (U)SIM card so as to suppress EMI
spurious transmission and enhance ESD protection. Please note that the (U)SIM peripheral circuit
should be close to the (U)SIM card connector.
The pull-up resistor on SIM_DATA line can improve anti-jamming capability when long layout trace
and sensitive occasion are applied, and should be placed close to the (U)SIM card connector.
3.13. SD Card Interface
The module provides an SD card interface that supports many types of memory such as Memory Stick,
SD/MCC card and T-Flash (or Micro SD) card. The following are the main features of SD card interface.
Only support 1bit serial mode
Not support the SPI mode for SD memory card
Not support multiple SD memory cards
Not support hot plug
The data rate up to 48MHz in serial mode
Support memory cards with maximum capacity up to 32GB
With the SD card interface features and reference circuit shown as below, customers can easily design the
SD card application circuit to enhance the memory capacity of the module. The users can store some
high-capacity files to SD card. For instance, in automobile application system, the module can record and
store the audio files to the SD card, and also can play the audio files in SD card.
Table 26: Pin Definition of SD Card Interface
Pin Name
Pin No.
I/O
Description
SD_CMD
7
DO
Command signal of SD card
SD_CLK
8
DO
Clock signal of SD card
Quectel
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