LC75886PW Datasheet, PDF (32/36 Pages) ON Semiconductor – 1/4 and 1/3-Duty LCD Display Driver

LC75886PW
About Data Communication Method with The Controller
1. About data communication method of 4 line type CCB format
The 4 line type CCB format is the data communication method of before. The LC75886PW must connect to the
controller as followings.
*17
Controller
(INT)
DI
DO
CL
CE
*16
Rup
Note: *16. Connect the pull-up resistor Rup. Select a resistance
DO
(between 1 to 10kΩ) appropriate for the capacitance of the
DI _LC75886PW
CL
external wiring so that signal waveforms are not degraded.
*17. The (INT) pin is an input port for the key data read request
signal (a low level on DO) detection.
CE
2. About data communication method of 3 line type CCB format
The 3 line type CCB format is the data communication method that made a common use of the data input DI in the
data output DO. The LC75886PW must connect to the controller as followings.
*17
Controller
(INT)
DIO
CL
CE
*16
Rup
DO
DI _LC75886PW
CL
CE
Note: *16. Connect the pull-up resistor Rup. Select a resistance
(between 1 to 10kΩ) appropriate for the capacitance of the
external wiring so that signal waveforms are not degraded.
*17. The (INT) pin is an input port for the key data read request
signal (a low level on DO) detection.
In this case, Applications must transfer the data communication start command before the serial data input (CCB
address “42H”, display data and control data transfer) or serial data output (CCB address “43H” transfer, key data read)
to avoid the collision of the data input signal DI and the data output signal DO.
Then applications must transfer the data communication stop command when the controller wants to detect the key data
read request signal (a low level on DO) during a movement stop of the serial data input and the serial data output.
<1> Data communication start command
(1) When CL is stopped at the low level
(2) When CL is stopped at the high level
CE
CE
CL
CL
DI/DO 0 0 0 0 0 0 0 0 0 0 1 1 0 1 1 1
CCB address “00H”
Command data
DI/DO 0 0 0 0 0 0 0 0 0 0 1 1 0 1 1 1
CCB address “00H”
Command data
<2> Data communication stop command
(1) When CL is stopped at the low level
(2) When CL is stopped at the high level
CE
CE
CL
CL
DI/DO 0 0 0 0 0 0 0 0 1 1 0 0 0 1 1 1
CCB address “00H”
Command data
DI/DO 0 0 0 0 0 0 0 0 1 1 0 0 0 1 1 1
CCB address “00H”
Command data
No.A1391-32/36