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LC75841PES-H

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
LC75841PE
www.onsemi.com
16
Display Control and the
INH
Pin
Since the IC’s internal data (the display data D1 to D27 and the control data when in static drive mode, and the display
data D1 to D54 and the control data when in 1/2 duty drive mode) is undefined when power is first applied, applications
should set the
INH
pin low at the same time as power is applied to turn off the display (setting S1/P1 to S4/P4 and S5 to
S27, COM1, and COM2 to the V
SS
level) and during this period send serial data from the controller. The controller
should then set the
INH
pin high after the data transfer has completed. This procedure prevents unnecessary display at
power on. (See figure 4, figure 5 and figure 6)
• Static drive mode
• 1/2 duty drive mode
• 1/2 duty drive mode (when in 842 mode data transfer)
[Figure 6]
V
DD
Internal data (D1 to D28, BU, SC)
Internal data (D29 to D54)
CE
INH
Undefined Defined Undefined
Display data and control data transferred
V
IL
1
tc
V
IL
1
Undefined Defined Undefined
t1
Notes: t1>0
tc  10s min
[Figure 5]
V
DD
Internal D1 to D28, P0 to P2,
data DT, FC0 to FC2,
OC, SC, BU
Internal data (D29 to D54)
CE
Undefined Defined Undefined
Display data and control data transferred
V
IL
1
tc
V
IL
1
Undefined Defined Undefined
t1
Notes: t1>0
tc  10s min
INH
V
DD
Internal D1 to D27, P0 to P2,
data DT, FC0 to FC2,
OC, SC, BU
CE
[Figure 4]
Notes: t1>0
tc  10s min
V
IL
1
t1
Display data and control data transferred
tc
V
IL
1
Undefined Defined
Undefined
INH
LC75841PE
www.onsemi.com
17
Notes on Controller Transfer of Display Data
Since the LC75841PE transfer the display data (D1 to D54) in two separate transfer operations in 1/2 duty drive mode,
we recommend that applications make a point of completing all of the display data transfer within a period of less than
30 ms to prevent observable degradation of display quality.
OSC Pin Peripheral Circuit
(1) RC oscillator operating mode (control data OC = 0)
An external resistor, Rosc, and an external capacitor, Cosc, must be connected between the OSC pin and GND if
RC oscillator operating mode is selected.
(2) External clock operating mode (control data OC = 1)
When the external clock operating mode is selected, insert a current protection resistor Rg (4.7 to 47 k) between
the OSC pin and external clock output pin (external oscillator). Determine the value of the resistance according to
the allowable current value at the external clock output pin. Also make sure that the waveform of the external
clock is not heavily distorted.
OSC
Cosc Rosc
Note: Allowable current value at external clock output pin >
V
DD
Rg
OSC External clock output pin
Rg
External oscillator
LC75841PE
www.onsemi.com
18
Sample Application Circuit 1
Static drive mode
*2: In RC oscillator operating mode, an external resistor, Rosc, and an external capacitor, Cosc, must be connected
between the OSC pin and ground. If external clock operating mode is selected, a current protection resistor, Rg (4.7
to 47 k), must be inserted between the external clock output pin (on the external oscillator) and the OSC pin. (See
the “OSC Pin Peripheral Circuit” section.)
*3: When a capacitor except the recommended external capacitance (Cosc = 1000 pF) is connected to the OSC pin, it
should be in the range 220 to 2200 pF.
*4: The pins to be connected to the controller (CE, CL, DI, INH
) can handle 3.3 V or 5.0 V.
Sample Application Circuit 2
1/2 duty drive mode
*2: In RC oscillator operating mode, an external resistor, Rosc, and an external capacitor, Cosc, must be connected
between the OSC pin and ground. If external clock operating mode is selected, a current protection resistor, Rg (4.7
to 47 k), must be inserted between the external clock output pin (on the external oscillator) and the OSC pin. (See
the “OSC Pin Peripheral Circuit” section.)
*3: When a capacitor except the recommended external capacitance (Cosc = 1000 pF) is connected to the OSC pin, it
should be in the range 220 to 2200 pF.
*4: The pins to be connected to the controller (CE, CL, DI, INH
) can handle 3.3 V or 5.0 V.
OPEN
From the controller
DI
CL
CE
INH
V
SS
COM2
S27
S26
S5
P4/S4
P2/S2
P1/S1
COM1
Used for functions
such as backlight
control
General-purpose
Output ports
(P4)
(P2)
(P1)
OSC
*2
*3
+5.0V V
DD
LCD panel (up to 27 segments)
(P3)
P3/S3
*4
+5.0V
V
SS
OSC
*2
*3
V
DD
S27
S26
S25
S5
P4/S4
P2/S2
P1/S1
COM2
COM1
From the controller
DI
CL
CE
INH
P3/S3
Used for functions
such as backlight
control
General-purpose
Output ports
(P4)
(P2)
(P1)
(P3)
LCD panel (up to 54 segments)
*4
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

LC75841PES-H

Mfr. #:
Buy LC75841PES-H
Manufacturer:
ON Semiconductor
Description:
LCD Drivers LCD DISPLAY DRIVER
Lifecycle:
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