Input/Output Pins And External Connections; List Of Input/Output Pins; External Connections - Epson S1C31D50 Technical Manual

20 R/F CONVERTER (RFC)

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
if the 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."
SENBn
SENAn
RFINn
S1C31 RFC
* Leave the unused pin (SENAn or SENBn) open if one resistive sensor only is used.
Figure 20.2.2.1 Connection Example in Resistive Sensor DC Oscillation Mode
SENBn
SENAn
RFINn
S1C31 RFC
Figure 20.2.2.2 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
V RFCLK input or oscillation control pin
SS
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
SS
R
SEN2
R
SEN1
REFn
R
REF
C
REF
R
SEN1
R
REFn
C
REF
Seiko Epson Corporation
Function
* Indicates the status when the pin is configured for the RFC.
R : Reference resistor
REF
R : Resistive sensor (DC bias)
SEN1
R : Resistive sensor (DC bias)
SEN2
C : Reference capacitor
REF
REF
R : Reference resistor
REF
R : Resistive sensor (AC bias)
SEN1
C : Reference capacitor
REF
S1C31D50/D51 TECHNICAL MANUAL
(Rev. 2.00)