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Table 5.
I
2
C Port Signal Descriptions
Signal Name Direction Description
GND — Reference for digital lines and +3.3 V power output.
3.3V Output +3.3 V power output.
SCL Input or Output I
2
C lines with 3.3 V output, 3.3 V-/5 V-compatible input.
Refer to the I
2
C Lines section for more information.
SDA Input or Output
RS-232 Port
The following figure and table describe the RS-232 port pins and signals.
Figure 7. RS-232 Serial Port Pinout
RXD
TXD
Table 6. RS-232 Serial Port Signal Descriptions
Signal Name Direction Description
TXD Output Serial transmit output with ±5 V to ±15 V signal levels. Refer to
the
UART and RS-232 Lines section for more information.
RXD Input Serial receive input with ±15 V input voltage range. Refer to the
UART and RS-232 Lines section for more information.
GND — Reference for digital lines.
DIO Port
The following figure and table describe the DIO port pins and signals.
Figure 8. DIO Port Pinout
1 2 3 5 6 7 4 8 0 9
S
5V
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