SIC63616-(Rev. 1.0) NO. P149
3240-0412
4.13 R/f Converter
4.13.1 Configuration of R/f converter
The S1C63616 has a built-in CR oscillation type R/f converter that can be used as an A/D converter.
Two systems (channel 0 and channel 1) of CR oscillation circuits are built into the R/f converter, so it
is possible to compose two types of R/f conversion circuits by connecting different sensors to each CR
oscillation circuit.
Channel 0 can be used as an R/f (Resistor/frequency) conversion circuit using a DC bias resistive sensor
such as a thermistor, and channel 1 can be used as an R/f conversion circuit the same as channel 0, or for an
AC bias resistive sensor such as a humidity sensor.
The channel to be used and sensor type for channel 1 are selected with software.
Resistance value (relative value to external reference resistance) of the resistive sensor that has been
connected to the sensor input terminal is converted into frequency by the CR oscillation circuit and the
number of clocks is counted in the built-in measurement counter. By reading the value of the measurement
counter, it can obtain the data after digitally-converting the value detected by the sensor.
Various sensor circuits such as temperature/humidity measurement circuits can be easily realized using
this R/f converter.
The configuration of the R/f converter is shown in Figure 4.13.1.1.
V
DD
V
SS
OSC3 oscillation
circuit (f
OSC3
)
OSC1 oscillation
circuit (f
OSC1
)
R/f converter
clock (f
TCCLK
)
Measurement
counter
clock (f
MCCLK
)
REF0
(P01)
SEN0
(P02)
RFIN0
(P00)
Interrupt
request
Ch. 0 oscillation control circuit
REF1
V
DD
V
SS
SEN1
HUD
RFIN1
Ch. 1 oscillation control circuit
Measurement counter
Time base counter
Data bus
Interrupt
control
OVTC
OVMC
MC00
–MC03
MC04
–MC07
MC08
–MC11
RFRUNR
RFRUNS
Clock
manager
Measurement
counter control
Channel
control circuit
MC12
–MC15
Time base
counter
control
TC00
–TC03
TC04
–TC07
TC08
–TC11
TC12
–TC15
MC16
–MC19
TC16
–TC19
RFOUT
(P03)
RFCKS0–RFCKS2
ERF0–ERF1
Programmable timer 1
underflow signal
Fig. 4.13.1.1 Configuration of R/f converter
Содержание S1C63616
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