User's Manual

Hardware Development Guide of Module Product
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ZM8620_V2
 NOTE:
The PCB wiring of UIM card should be laid closely around the module as possible as you can, and the
ESD component should be put near the UIM card socket by the customer.
Table 4–4 Definition & Description of (U) SIM Card Signal Group
PIN
Signal Name
Signal Description
8
VREG_UIM
USIM card power, output from the module
10
UIM_DATA
USIM card DATA signal, two-way signal
12
UIM_CLK
USIM card clock signal, output from the module
14
UIM_RST
USIM card reset signal, output from the module
4.4.2 Electric Feature
The signals of (U)SIM card signal group are described in Table 4-4. As the USIM card console is placed
on the system board side, be sure to add the ESD protection during the design.
To comply with the requirements of 3GPP TS 51.010-1 and EMC authentication, it is recommended to
place (U)SIM card console close to the (U)SIM card interface, to prevent the wiring from being too long,
which might seriously distort the waveform and thus affect the signal integrity. It is recommended to
make the grounding protection for UIM_CLK and UIM_DATA signal wiring.
Cascade one 0.1uF and 33pF capacitor between VREG_UIM and GND, and cascade a 33pF bypass
capacitor between UIM_CLK, UIM_RST and GND, to filter out the interference by RF signals. It is
recommended to cascade a 20ohm resistance on UIM_DATA signal. And UIM_DATA must be pulled up
via a 20K ohm resistance to VREG_UIM.
4.5 USB2.0 Interface
4.5.1 Description of PINs
ZM8620_V2 has the high-speed USB2.0 interface,. USB is connected to the system board side via the
PCI-E interface, to communicate with the processor on the system board side. Its PINs are PIN36
(USB_DM), PIN38 (USB_DP). The USB interface can be mapped to difference ports, such as
Diagnostics port to capture the log, AT port is used to complete AT command interaction with the AP
side.