Specifications

REV.-A
Power On
CPU Self Reset
I
i
+5 V Line -
Vmml
Figure 2-20. RESET Signal Timing
2.3.3 Sensor Circuits
Figure 2-21 shows the sensor circuits in block diagram form. Detection of any excessive printhead
temperature causes the TEMP2 signal to be sent directly to the CPU. Other signals, such as the
CRHOME
signal, pass through the
STK-6022B unit before reaching the CPU. Terminals P50 to P55 on the CPU
are used for the A/D convertor.
The
Vref circuit generates the A\D convertor reference voltage Vref.
CPU (1 c)
STK-6022B (2A)
P55
CRHOUT ~ CRHOME
CRHOME
P54 PE20UT ~
PE2 ‘
PE2
P52
B
PE1OUT ~
PE 1
E
PE1
P34
GAPOUT
~
GAP
GAP
P31
LEVOUT
~ LEVER LEVER
P51 —“
AVPP
~
VPP +35 V Line
I ‘50~TEMp2
4.741 v
Vref ‘ Vref Circuit
Figure 2-21, Sensor Circuit Block Diagram
2-16