Head Current Control - Star Micronics TSP200 Series Technical Manual

PRINCIPLES OF OPERATION
V
DD
GND
L
V
CHECKER
STB
BEO
LAT
CTL
SI
CLK

2-2-3. Head current control

Although the thermal printhead has four different STROBE lines, in fact it uses only three strobe signals to control its 576
elements. Specifically, each signal drives 192 of these elements. The signal/element arrangement is shown below.
Thermal Printhead
STROBE1
STROBE2
STROBE3
STROBE4
DO1 DO2
DD
Q
L
D
Q
D
C
Fig. 2-5 Block Diagram of Drive IC
Elements
1 – 192
193 – 256
257 – 384
385 – 576
DO3 DO62
BUFFER
Q Q Q
LATCH
L L L
D D D
Q Q
D D D
SHIFT
REGISTER
C C C
Strobe Signal
STB1
STB2
STB3
– 16 –
DO63 DO64
Q Q
L L
D D
Q Q Q
D D
C C
GND
H
V
DD
SO