Table of Contents
Advertisement
Circuit Description
5-2-7. Reset
To initialize the chipÕs internal logic, the reset input
(/RESET) must be held to 0 Volt for at least 22 CPU
clocks. During this time, Vdd must be greater than 3
volt. The watchdog timer can also invoke a system
reset.
[+5V Power Monitoring]
If 5 Volt power to KIA7045P drops to between 4.65V
and 4.35V (typically 4.5V), power failure will be
indicated and the output of KIA7045P will go ÔlowÕ
(GND5). This causes the KS16118 to become active
(ÔlowÕ=reset).
The KS32C6500 reset causes the /RESET terminal to
be reset. The output terminal of KIA7045P is an
open-drain configuration, and is connected to
KS32C6500 through a 10 kohm pull-up resistor.
5-2-8. Carriage Return Motor Driver
The CR motor drives the head in two directions to
print data on the recording paper.
Motor type : Step Bipolar
Operation Voltage : +24V DC
Resistance : 5 ohm +/-10%
IC : PBL3717 x2EA
STEP MOTOR DRIVER OUTPUT SIGNAL
Standby
Full Step
CRIAO
CRIA 1
PHA
PHB
CRIBO
CRIB 1
500mA
IMA
-500mA
500mA
IMB
-500mA
Figure 5-5 Step Motor Drive
5-4
5-2-9. Line Feed Motor Driver
The LF motor feeds paper in and out.
Motor type : Step Unipolar
Operation Voltage : +24V DC
Holding Voltage : +5V DC
Resistance : 50 ohm ±10%
IC : STA471A
5-2-10. Head Nozzle Driver
The nozzle control circuit is composed as follows:
Number of nozzle : 56 nozzles for mono
Driving Voltage : +24V DC +/-2%
Driving Pulse Width : 3.6 us for mono
Operation Frequency : 5 kHz
Resistance : 30 ohm for mono
IC : SGS Thomson L6451 or Allegro A5817
The IC decodes four input signals (PHINA, PHINB,
PHINC, PHIND) and enables the selected using
OEA and OEB signal input.
IND
0
0
0
0
0
0
0
0
1
1
1
INPUT
1
1
1
1
1
OUTPUT
INC
INB
INA
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Table 5-1 Nozzle Driver Signal
Samsung Electronics
N
0
1
2
3
4
5
6
7
8
9
10
11
12
13
ALL OFF
ALL OFF
Advertisement
Table of Contents
