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19 R/F Converter (RFC)
19.1 Overview
The RFC is a CR oscillation type A/D converter (R/F converter).
The features of the RFC are listed below.
• Converts the sensor resistance into a digital value by performing CR oscillation and counting the oscillation
clock.
• Achieves high-precision measurement system with low errors by oscillating the reference resistor and the sensor
in the same conditions to obtain the difference between them.
• Includes a 24-bit measurement counter to count the oscillation clocks.
• Includes a 24-bit time base counter to count the internal clock for equalizing the measurement time between the
reference resistor and the sensor.
• Supports DC bias resistive sensors and AC bias resistive sensors.
(A thermometer/hygrometer can be easily implemented by connecting a thermistor or a humidity sensor and a
few passive elements (resistor and capacitor).)
• Allows measurement (counting) by inputting external clocks.
• Provides an output and continuous oscillation function for monitoring the oscillation frequency.
• Can generate reference oscillation completion, sensor (A and B) oscillation completion, measurement counter
overflow error, and time base counter overflow error interrupts.
Figure 19.1.1 shows the RFC configuration.
Item
SQFN7-48PIN
Number of channels
Low power
consumption design
RFC Ch.n
Interrupt
controller
OVTCIE
OVMCIE
ESENBIE
ESENAIE
EREFIE
TCCLK
CLKSRC[1:0]
Clock generator
CLKDIV[1:0]
DBRUN
MODEN
CONEN
EVTEN
SMODE[1:0]
S1C17W12/W13 TECHNICAL MANUAL
(Rev. 1.2)
Table 19.1.1 RFC Channel Configuration of S1C17W12/W13
S1C17W12
Chip
1 channel (Ch.0)
Adopted
Interrupt
control circuit
Counter
control circuit
CR oscillation
control circuit
Figure 19.1.1 RFC Configuration
Seiko Epson Corporation
TQFP12-48PIN
SQFN7-48PIN
–
Not adopted
OVTCIF
OVMCIF
ESENBIF
ESENAIF
EREFIF
Time base counter
TC[23:0]
Measurement counter
MC[23:0]
SSENB
SSENA
SREF
19 R/F CONVERTER (RFC)
S1C17W13
QFP13-64PIN/Chip
1 channel (Ch.0)
RFCLKMD
1/2
RFCLKOn
RFINn
Oscillation
REFn
circuit
SENAn
SENBn
19-1
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