APU429 查看數據表（PDF） - APLUS INTEGRATED CIRCUITS
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APU429 Datasheet PDF : 18 Pages
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resolution but with a longer read-out rate (for example: 10 seconds per read-out), you can switch the measure
mode in order to set FIN (CX) as interval control (it will enable the counter from first FIN rising edge to the next
rising edge, then will generate an interrupt) and use FREQ (internal frequency generator output) as clock
input, hence you can count the interval of CX.
To measure the resistor value of the temperature and humidity sensor, we must first measure the frequency
of Rref, then the frequency of sensor.
Fref= K/Rref CX and
Fsensor= K/Rsensor CX, hence
Rsensor= Rref * Freq/Fsensor.
Where K is a coefficient for RC-oscillation and will be a constant in a short time period.
Keyboard scanning function
SEG11~26 shares the keyboard scanning output, the output of the keyboard scanning is a P open-drain to
VDDO (positive power supply) and all other SEGs and COMs are in Hi-z state during this period. This will
minimize the effect of the LCD output.
The segment 11-26 also could be used as keyscan output and LCD still could be displayed with only slightly
affected.
SPK 00b5 b4 b3 b2 b1 b0.
b5: 1 will disable key-scan output.
b4: 1 will set all keyscan output as high, if b5=0.
b3~b0: will set the corresponding segment output as 1, if b5=0 and b4=0.
During power on, LCD off, STOP condition. All the common & segment output will be the chips supply power.
EL-light
Set the ELC and ELP clock and duty cycle by ELC X instruction, then turn on and off the ELC and ELP output
by SF X and RF X instruction. With external transistor, diode, inductor and resistor, we can pump the Elpanel
to AC 100~250V.
L1
D1
R1
ELP
Q1
R2
ELC
Q2
EL-plane
LIT
ELP
ELC
While the light is turned on, the ELC will turn on before the ELP, but when the light is turned off, the ELP and
ELC will turn off after the next falling edge of the ELC to make sure no voltage is left on the EL- panel.
Preliminary
9
Ver. 0.0
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