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FIBOCOM SC138-
NA
Series Hardware Guide
41/88
sleeping status can be configured by software.
When the modules are in the sleeping status, pull down KEY_PWR_N pins for 0.1s, and then the
modules can be waked up.
3.2.2
Volume Control
KEY_VOL_UP_N/KEY_VOL_DOWN_N pin is the volume increase/decrease key; for the circuit design of
volume key, refer to the startup circuit design.
The parallel capacitance of volume key should not exceed 100 pF.
3.3
SPMI Interface
None
3.4
USB Interface
SC138 series modules support 1-channel USB 3.0 interfaces, being downward compatible with USB 2.0
interfaces; USB 2.0 interfaces support HS (480 Mbps) mode, being downward compatible with USB 1.1
FS (12 Mbps), USB 3.0 ports support SS (5G bps) mode, USB interfaces support OTG functions and
HUB expansion interfaces. USB 2.0 interfaces support software downloading, but USB 3.0 interfaces do
not support software downloading. The following table defines pins of USB interfaces:
Table 3-6 Definition of pins of USB 2.0 interfaces
Pin name
Pin No.
I/O
Description
Remarks
USB_IN_DET
168
PI
VBUS input Detection
-
USB_DP
12
I/O
USB differential
-
USB_ DM
11
I/O
USB differential signal -
-
USB_ID
16
DI
USB ID pin
-
Note: