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參數(shù)資料
| 型號(hào)： | S1C62920D |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 1.3 MHz, MICROCONTROLLER, UUC63 |
| 封裝： | DIE-63 |
| 文件頁數(shù)： | 47/78頁 |
| 文件大?。?/td> | 874K |
| 代理商： | S1C62920D |
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S1C62920 TECHNICAL MANUAL
EPSON
43
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (R/F Converter)
The capacitor for the CR oscillation circuit is commonly used for the reference resistance and both sensors.
The CR oscillation circuit is configured with the reference resistance, each of the sensors and this capacitor
and can R/F-convert using the reference resistance and the sensor selected by the software.
The R/F converter performs CR oscillation using each of the two resistances (sensor and reference resist-
ance) in the same period, and counts the CR oscillation clock. Difference in counted oscillation frequency
can be evaluated in terms of the difference between the respective resistance values. Measurement results
can be obtained from the changes in resistance values after correcting the difference according to the
program. Consequently, a resistance that has a resistance value equivalent to the middle of the measure-
ment range of the sensor to be used for measurement should be used as a reference resistance. An element
that does not change due to temperature or other environmental conditions must be used as the reference
resistance.
Sensor to be R/F-converted can be selected as below using the registers SENS0 and SENS1.
SENS1 = "1", SENS0 = X
... SEN2 is selected
SENS1 = "0", SENS0 = "1" ... SEN1 is selected
SENS1 = "0", SENS0 = "0" ... SEN0 is selected
The following explains the operation of the CR oscillation circuit that is configured with the above connec-
tion.
The operation of the CR oscillation circuit is similar for both reference resistance and sensors, so the
following explanation is in the case of the CR oscillation circuit with the sensor connected to the SEN0
terminal.
Figure 4.10.2.2 shows the CR oscillation circuit configured with the SEN0 terminal.
VSS
Tr1
SEN0
CR oscillation
control circuit
VDD
RFIN
Tr2
RFOUT
To measurement
counter
CRF
RSEN0
RFIN terminal
RFOUT outpuut
VDD
VSS
VDD
VSS
Fig. 4.10.2.2 CR oscillation circuit
The Tr1 turns on first, and the capacitor (CRF) connected between the VDD and RFIN terminals is charged
through the sensor (RSEN0). If the voltage level of the RFIN terminal decreases, the Tr1 turns off and the Tr2
turns on. As a result, the capacitor becomes discharged, and oscillation is performed according to CR time
constant. The time constant changes as the sensor resistance value fluctuates, producing a difference from
the oscillation frequency of the reference resistance.
The above example is in the case of a SEN0 terminal. Controlling whether the reference resistance or the
sensor selected by the software to be CR-oscillated (controlling a transistor of terminal) is done by the CR
oscillation circuit.
Oscillation waveforms are shaped by the schmitt trigger and transmitted to the measurement counter. The
clock transmitted to the counter is also output from the RFOUT terminal. As a result, oscillation frequency
can be identified by the oscilloscope. Since this monitor has no effect on oscillation frequency, it can be
used to adjust CR oscillation frequency.
Oscillation waveforms and waveforms output from the RFOUT terminal are shown in Figure 4.10.2.3.
Fig. 4.10.2.3 Oscillation waveform
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