Ordering number : EN6235A
CMOS IC
LC75844M
Overview
1/4-Duty General-Purpose
LCD Display Driver
The LC75844M is a 1/4 duty general-purpose LCD driver that can be used for frequency display in electronic tuners
under the control of a microcontroller. The LC75844M can drive an LCD with up to 88 segments directly. The
LC75844M can also control up to 4 general-purpose output ports. Since the LC75844M uses separate power supply
systems for the LCD drive block and the logic block, the LCD driver block power-supply voltage can be set to any
voltage in the range 2.7 to 6.0 volts, regardless of the logic block power-supply voltage.
Application
•
Car, Home frequency display
Features
•
Support for 1/4 duty 1/2 bias or 1/4 duty 1/3 bias drive of up to 88 segments under serial data control.
•
Serial data input supports CCB format communication with the system controller.
•
Serial data control of the power-saving mode based backup function and all the segments forced off function
•
Serial data control of switching between the segment output port and the general-purpose output port functions
•
High generality, since display data is displayed directly without decoder intervention.
•
Independent VLCD for the LCD driver block (VLCD can be set to any voltage in the range 2.7 to 6.0 volts,
regardless of the logic block power-supply voltage.)
•
The INH pin can force the display to the off state.
•
RC oscillator circuit
CCB is a trademark of SANYO Electric Co., Ltd.
•
CCB is SANYO's original bus format and all the bus addresses are controlled by SANYO.
•
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be
intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace
instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety
equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case
of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee
thereof. If you should intend to use our products for applications outside the standard applications of our
customer who is considering such use and/or outside the scope of our intended standard applications, please
consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our
customer shall be solely responsible for the use.
Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate
the performance, characteristics, and functions of the described products in the independent state, and are not
guarantees of the performance, characteristics, and functions of the described products as mounted in the
customer
'
s products or equipment. To verify symptoms and states that cannot be evaluated in an independent
device, the customer should always evaluate and test devices mounted in the customer
'
s products or
equipment.
80608HKIM B8-8317 / 92299TH(OT) No.6235-1/15
LC75844M
Specifications
Absolute Maximum Ratings
at Ta = 25°C, VSS = 0V
Parameter
Maximum supply voltage
Symbol
VDD max
VLCD max
VIN1
Input voltage
VIN2
VIN3
Output voltage
VOUT1
VOUT2
IOUT1
Output current
IOUT2
IOUT3
Allowable power dissipation
Operating temperature
Storage temperature
Pd max
Topr
Tstg
VDD
VLCD
CE, CL, DI, INH
OSC
VLCD1, VLCD2
OSC
S1 to S22, COM1 to COM4, P1 to P4
S1 to S22
COM1 to COM4
P1 to P4
Ta = 85°C
Conditions
Ratings
-0.3 to +7.0
-0.3 to +7.0
-0.3 to +7.0
-0.3 to VDD+0.3
-0.3 to VLCD+0.3
-0.3 to VDD+0.3
-0.3 to VLCD+0.3
300
3
5
100
-40 to +85
-55 to +125
mW
°C
°C
μA
mA
V
V
Unit
V
Allowable Operating Ranges
at Ta = -40 to +85°C, VSS = 0V
Ratings
Parameter
Symbol
VDD
VLCD
VLCD1
VLCD2
VIH
VIL
Rosc
Cosc
fosc
tds
tdh
tcp
tcs
tch
tφH
tφL
tr
tf
tc
VDD
VLCD
VLCD1
VLCD2
CE, CL, DI, INH
CE, CL, DI, INH
OSC
OSC
OSC
CL, DI
CL, DI
CE, CL
CE, CL
CE, CL
CL
CL
CE, CL, DI
CE, CL, DI
INH, CE
[Figure 2]
[Figure 2]
[Figure 2]
[Figure 2]
[Figure 2]
[Figure 2]
[Figure 2]
[Figure 2]
[Figure 2]
[Figure 3]
10
25
160
160
160
160
160
160
160
160
160
0.8VDD
0
43
680
50
100
Conditions
min
2.7
2.7
2/3VLCD
1/3VLCD
typ
max
6.0
6.0
VLCD
VLCD
6.0
0.2VDD
V
V
kΩ
pF
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
μs
V
Unit
Supply voltage
V
Input voltage
Input high-level voltage
Input low-level voltage
Recommended external resistor
Recommended external capacitor
Oscillation guaranteed range
Data setup time
Data hold time
CE wait time
CE setup time
CE hold time
High-level clock pulse width
Low-level clock pulse width
Rise time
Fall time
INH switching time
No.6235-2/15
LC75844M
Electrical Characteristics
at Allowable Operating Ranges
Parameter
Hysteresis width
Input high-level current
Input low-level current
Output high-level voltage
Symbol
VH
IIH
IIL
VOH1
VOH2
VOH3
Output low-level voltage
VOL1
VOL2
VOL3
Output middle-level
voltage
*1
VMID2
VMID3
VMID4
VMID5
Oscillator frequency
Supply current
fOSC
IDD1
IDD2
ILCD1
ILCD2
ILCD3
S1 to S22
S1 to S22
COM1 to COM4
COM1 to COM4
OSC
VDD
VDD
VLCD
VLCD
VLCD
1/3 bias, IO = ±20μA
1/3 bias, IO = ±20μA
1/3 bias, IO = ±100μA
1/3 bias, IO = ±100μA
Rosc = 43kΩ
Cosc = 680pF
Power saving mode
VDD = 6.0V, output open,
fosc = 50kHz
Power saving mode
VLCD = 6.0V, output open,
1/2 bias, fosc = 50kHz
VLCD = 6.0V, output open,
1/3 bias, fosc = 50kHz
100
60
230
VMID1
Pin
CE, CL, DI, INH
CE, CL, DI, INH
CE, CL, DI, INH
S1 to S22
COM1 to COM4
P1 to P4
S1 to S22
COM1 to COM4
P1 to P4
COM1 to COM4
VI = 6.0V
VI = 0V
IO = -20μA
IO = -100μA
IO = -1mA
IO = 20μA
IO = 100μA
IO = 1mA
1/2 bias, IO = ±100μA
1/2VLCD
-0.9
2/3VLCD
-0.9
1/3VLCD
-0.9
2/3VLCD
-0.9
1/3VLCD
-0.9
40
50
-5.0
VLCD-0.9
VLCD-0.9
VLCD-0.9
0.9
0.9
0.9
1/2VLCD
+0.9
2/3VLCD
+0.9
1/3VLCD
+0.9
2/3VLCD
+0.9
1/3VLCD
+0.9
60
5
460
5
200
120
μA
kHz
V
V
V
Conditions
Ratings
min
typ
0.1VDD
5.0
max
Unit
V
μA
μA
Note: *1 Excluding the bias voltage generation divider resistors built into VLCD1, VLCD2. (See Figure 1.)
VLCD
VLCD1
To the common segment driver
VLCD2
Except these resistors
VSS
Figure 1
No.6235-3/15
MCU
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