Specifications

REV.-A
2.3.8 TE Motor Drive Circuit
A stepping motor is used to drive the TE motor. The phase data for the stepping motor is transmitted
from the port on
E05A65 to the driver - PU 1501, and controls the stepping motor by constant-voltage
method. The TE motor is supplied with + 5 VDC in hold mode, and +35 VDC in drive
switching is controlled through the port
PD3 on E05A65.
E05A65
PU1501 (IC18)
I
CPU
Phase
Bus
PAO
DATA
DRIVER
(IC5)
-PA3
CIRCUIT
DRIVE
PD3
VOLTAGE
CHANGE
I
I
-L-I T:OTOR
I
I
I
I
I
I
I
1
I
I
I
mode. This
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Figure 2-49. Block Diagram of TE Motor Drive Circuit
2.3.9 Timer Circuit and Backup Circuit
Figure 2-50 shows the block diagram of the timer circuit and the backup circuit.
The timer circuit (TC8521 AM on CPU bus) outputs the time data used for the pump unit sequence
control. The operation of this circuit is independent of the main power ON/OFF state. The backup circuit
is used to back up the timer circuit in the main power OFF state. Since this circuit monitors the + 5
VDC line, it supplies + 5 VDC as soon as the main power is turned on. When the + 5 VDC line indicates
+ 3.3
VDC or less, the power is supplied from the lithium battery.
CIRCUIT
n
BAITERY
Figure 2-50. Block
TIMER
BUS
J
TC8521AM
(6E)
CPU
(IC5)
Diagram of Timer Circuit/Backup Circuit
2-37