LH1594 SHARP [Sharp Electrionic Components], LH1594 Datasheet - Page 18

• Manufacturer Part Number: LH1594
• Description: 80-Segment and 17-Common Outputs LCD Driver IC with A Built-in CGROM
• Manufacturer: SHARP [Sharp Electrionic Components]

2.20. Initialization
The LH1594/LH1595 are initialized by setting RESB
pin to "L". Normally, RESB pin is initialized together
with MPU by connecting to the reset pin of MPU.
When power is ON, be sure to reset operation.
Function
Entry mode
Display mode
Display control (1)
Display control (2)
Power control
Register in electronic
volume
Annunciator control
RAM data
PARAMETER
RE = 0 : Writes to expanded
BE = 0 : SEGRAM blink OFF
DUB = 0 : Normal display mode
BT = 0 : Blinking type is normal/
I/D = 1 : Increments by one.
S = 0 : No shift occurs.
NL = 0 : Displays 2 lines.
D = 0 : Display OFF
C = 0 : Cursor OFF
B = 0 : Blink OFF
PLUS = 0 : 1/16 duty
REV = 0 : Normal display
ALON = 0 : Normal display
HALT = 0 : Power saving OFF
PON = 0 : Power supply circuit OFF
ACL = 0 : ACL operation OFF
BIAS : 1/5 bias
(1, 1, 1, 1)
DA = 0 : Annunciator display
I0 to I9 = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
DDRAM : Not determined.
CGRAM : Not determined.
SEGRAM : Not determined.
PIN DESCRIPTION
reverse display.
register disabled.
OFF
(Displaying double
fonts lengthwise OFF)
18
3. PRECAUTIONS
Precautions when connecting or disconnecting
the power supply
This IC may be permanently damaged by a high
current which may flow if voltage is supplied to the
LCD drive power supply while the logic system
power supply is floating. The details are as follows.
q When using an external power supply
ø When connecting the power supply
ø When disconnecting the power supply
w When using the internal power supply
ø When connecting the power supply
ø When disconnecting the power supply
It is advisable to connect the serial resistor (50 to
100 $) or fuse to the LCD drive power V
of the system as a current limiter. Set up a suitable
value of the resistor in consideration of the display
grade.
After connecting the logic system power supply,
make reset operation and then apply external
LCD drive voltages to corresponding pins. (V
V
After executing HALT command, disconnect
external LCD drive voltages and then disconnect
the logic system power supply.
After connecting the logic system power supply,
make reset operation and then execute PON
command.
After executing HALT command, disconnect the
logic system power supply.
1
, V
2
, V
3
, V
4
or V
OUT
, V
R1
and V
LH1594/LH1595
R2
)
OUT
or V
0
0
,