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20.2. Input/Output Pins and External Connections
20.2.1. List of Input/Output Pins
Table 20.2.1.1 lists the RFC pins.
Pin name
I/O*
SENBn
A
SENAn
A
REFn
A
RFINn
A
RFCLKOn
O
If the port is shared with the RFC pin and other functions, the RFC input/output function must be
assigned to the port before activating the RFC. For more information, refer to the "I/O Ports" chapter.
Note:
The RFINn pin goes to V
pin is biased by an external circuit.
20.2.2. External Connections
The figures below show connection examples between the RFC and external sensors. For the oscillation
mode and external clock input mode, refer to "Operating Mode."
Figure 20.2.2.1 Connection Example in Resistive Sensor DC Oscillation Mode
Figure 21.2.2.2 Connection Example in Resistive Sensor AC Oscillation Mode
20-2
Table 20.2.1.1 List of RFC Pins
Initial status*
Hi-Z
Sensor B oscillation control pin
Hi-Z
Sensor A oscillation control pin
Hi-Z
Reference oscillation control pin
VSS
RFCLK input or oscillation control pin
Hi-Z
RFCLK monitoring output pin
RFCLK is output to monitor the oscillation frequency.
level when the port is switched. Be aware that large current may flow if the
SS
SENBn
R
SENAn
R
SEN1
REFn
R
REF
RFINn
C
REF
S1C31 RFC
SENBn
R
SEN1
SENAn
REFn
RFINn
C
REF
S1C31 RFC
Seiko Epson Corporation
Function
* Indicates the status when the pin is configured for the RFC.
SEN2
R
: Reference resistor
REF
R
: Resistive sensor (DC bias)
SEN1
R
: Resistive sensor (DC bias)
SEN2
C
: Reference capacitor
REF
R
REF
R
: Reference resistor
REF
R
: Resistive sensor (AC bias)
SEN1
C
: Reference capacitor
REF
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
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