SIM5218E Hardware Design
VBUS
D+
GND
D-
VBUS
D+
D-
GND
Series
A
,
B
or
Mini-B
Receptacle
SIM5218
Figure 22: USB interface
Currently SIM5218E supports the USB suspend & resume mechanism which can help to save
much current. If no transaction on USB bus then SIM5218E will enter to suspend mode and when
some events happens (such as incoming call or SMS received) during the suspend mode then
SIM5218E will resume automatically.
Note: when use the Mini-B it has no ID line.
Note
：
Two limitations on ESD protection: less than 4 pF and VBUS not to rail.
3.12 Module Reset
SIM5218E also have a RESET pin (PIN29) input, When should reset the module, one can push
the RESET pin to low and the module reset. Because the Reset pin has been pulled up in
SIM5218E, there is no need to pull it up in application circuit.The internal circuit about RESET
pin is shown below.
NOTE
：
Reset time:50ms<t<200ms.
3.13 General purpose input & output (GPIO)
SIM5218E provides a limited number of General Purpose Input/Output signal pin. Please check
SIM5218E_ Hardware Design_V1.06
2012.09.21
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