RoyalTek
Confidential
9
REB-4315 Operational Manual
9 Interface
document
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Pin defined:
Pin
No.
Name
Input/
Output
Description Characteristics
1 NC
Non
connect
2 NC
Non
connect
3 PPS Output
TM Time mark output.
Output pulse timing.
Vol Max
：
0.4v
Voh Min
：
1.35v
(CMOS I/O run from 1.8v)
4
TX
Output
UART data transmit.
Vol Max
：
0.4v
Voh Min
：
1.35v
(CMOS I/O run from 1.8v)
5
RX
Input
UART data receive.
Vil
：
-0.4v~0.45v
Vih
：
1.26v~3.6v
(CMOS I/O run from 1.8v)
6 GPIO-3
Reserved Reserved.
7 EI2/GPIO-8
Reserved
Reserved.
8 GND
Ground
