參數(shù)資料
型號: S1C63653F
元件分類: 微控制器/微處理器
英文描述: 4-BIT, FLASH, 4 MHz, MICROCONTROLLER, CQFP100
封裝: CERAMIC, QFP15-100
文件頁數(shù): 117/121頁
文件大?。?/td> 1127K
代理商: S1C63653F
S1C63653 TECHNICAL MANUAL
EPSON
87
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (R/f Converter)
(2) R/f conversion using a resistive humidity sensor
This conversion is possible only in channel 1, and this method is selected by setting the RFSEL register
to "1". This is basically the same as the R/f conversion described above (1), but the AC bias circuit
works for the humidity sensor.
Figure 4.12.2.4 shows the connection diagram of external devices.
R2
VSS
C
SEN1
HUD
REF1
RFIN1
Channel 1
R1:
R2:
C:
Resistive humidity sensor
Reference resistor
Capacitor
R1
Fig. 4.12.2.4 Connection diagram of resistive humidity sensor
Connect a humidity sensor between the HUD and SEN1 terminals, and connect a reference resistance
between the REF1 and RFIN1 terminals.
Connect an oscillating capacitor that is used for CR oscillation of both the reference resistance and the
sensor between the RFIN1 and VSS terminals.
The oscillating operation by reference resistance is the same as the R/f conversion described above
(1). The humidity sensor cannot be DC biased for a long time, therefore this method powers the HUD
and SEN1 terminals alternately.
VSS
Tr1
Tr2
VSS
REF1
SEN1
RFIN1
VDD
Oscillation
control
circuit
RFOUT
Count
clock
HUD
S1
S2
Tr1 = ON, S1 = ON
Tr2 = ON, S2 = ON
Fig. 4.12.2.5 CR oscillation circuit for resistive humidity sensor
The oscillation waveform is the same as Figure 4.12.2.3.
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