Usb Application Guide; Usim Interface - SimCom SIM7600V-H User Manual

3.4.1

USB Application Guide

Module can be used as a USB device. Module supports the USB suspend and resume mechanism
which can reduce power consumption. If there is no data transmission on the USB bus, Module will
enter suspend mode automatically and will be resumed by some events such as voice call, receiving
SMS, etc.
Because of the high bit rate on USB bus, more attention should be paid to the influence of the
junction capacitance of the ESD component on USB data lines. Typically, the capacitance should
be less than1pF. It is recommended to use an ESD protection component such as ESD9L5.0ST5G
provided by On Semiconductor (
D3 is suggested to select the diode with anti-ESD and voltage surge function, or customer could
add a ZENER diode for surge clamping. The recommend diodes list please refer to table 7.
L is recommended (MURATA) DLW21SN371SQ2L.
Note ： The USB_DM and USB_DP nets must be traced by 90Ohm+/-10% differential impedance.
3.5

USIM Interface

Module supports both 1.8V and 3.0V USIM Cards.
Table 11: USIM Electronic characteristic in 1.8V mode (USIM_VDD=1.8V)
Symbol Parameter
USIM_
LDO power output voltage
VDD
V High-level input voltage
IH
V Low-level input voltage
IL
V High-level output voltage
OH
V Low-level output voltage
OL
SIM7600V-H_User Manual_V1.00
Figure 17: USB reference circuit
).
www.onsemi.com
Min.
1.75
0.65*USIM_VDD
-0.3
USIM_VDD -0.45
0
Smart Machine Smart Decision
Typ. Max.
1.8 1.95
- USIM_VDD +0.3
0 0.35*USIM_VDD
- USIM_VDD
0 0.45
28
Unit
V
V
V
V
V
2018-02-24