SA8807A
PIN DESCRIPTION (Continued)
Pin
Pin
Designation Description
PLCC-44 DIP-40
14
2
VS[20]
LCD segment driver outputs
15
16
17
30
31
32
33
29
12
24
34
44
3
4
5
17
18
19
20
16
VS[21]
VS[22]
VS[23]
VR[0]
VR[1]
VR[2]
VR[3]
NC
NC
NC
NC
NC
Not connected
LCD row driver outputs
FUNCTIONAL DESCRIPTION
The SA8807A is a CMOS Liquid Crystal Driver integrated circuit for displays having 3 or
4 track multiplexed backplanes and up to 96 LCD segments.
Data exchange is performed through a Serial Peripheral Interface (SPI).
1.
Serial Peripheral (SPI) Interface
The SPI Interface is a 4 wire interface.
The device transmits the data to the Master via MISO (Master In, Slave Out).
Data from the Master is received through MOSI (Master Out, Slave In). The data
is always synchronised to the Serial Clock (SCK), which is supplied from the Master.
CE is a active high signal, the rising edge defining the start of a transfer procedure.
The transfer procedure is terminated with the falling edge of CE.
Diagram 1 illustrates the relationships between Clock, Data and Chip Enable
signals.
The SA8807A determines the clock polarity during the low to high transition of the
CE signal.
6/14
sames
SAMES [ SAMES ]
