HD66727 Datasheet, PDF (12/97 Pages) Hitachi Semiconductor – Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function

HD66727
Pin Functions
Table 3 Pin Functional Description
Signal
IM
Number of
Pins
I/O
1
I
ID1/ CS* 1
I
SDA
1
I/O
SCL
1
I
ID0
1
I
IRQ*
1
O
KST0–
8
O
KST7
KIN0–KIN3 4
I
LED0–
3
O
LED2
PORT0– 3
O
PORT2
COMS1/2, 2
O
COMS2/1
COM1/32– 32
O
COM32/1
Connected to Function
V_CC or GND
Selects the MPU interface mode:
Low: I²C bus mode
High: Clock-synchronized serial mode
ID1: V_CC or GND Inputs the HD66727's identification code (ID1) in the I²C
CS*: MPU
bus mode.
Selects the HD66727 in the clock-synchronized serial
mode:
Low: HD66727 is selected and can be accessed
High: HD66727 is not selected and cannot be accessed
MPU
Inputs/outputs serial (receive/transmit) data and outputs
the acknowledge bit in the I²C bus mode.
Inputs/outputs serial (receive/transmit) data in the clock-
synchronized serial mode.
MPU
Inputs serial clock pulses. Serial data is latched at the
rising edge of each clock pulse.
V_CC or GND
Inputs the HD66727's identification code in both
interface modes; must be fixed to high or low.
MPU
Generates the key scan interrupt signal.
Key matrix
Generates strobe signals for latching scanned data from
the key matrix at specific time interval.
Key matrix
Samples key state from key matrix synchronously with
strobe signals.
LED back light Output ports for control of LED or back light. Can draw 2
mA–3 mA sink current. Also used as general ports.
General output General output ports. These ports cannot drive current
such as LED control.
LCD
Common output signals for segment-icon display.
LCD
Common output signals for character display: COM1 to
COM8 for the first line; COM9 to COM16 for the second
line, COM17 to COM24 for the third line, and COM25 to
COM32 for the fourth line. All the unused pins output
deselection waveforms. In the sleep mode (SLP = 1) or
standby mode (STB = 1), all pins output V_CC level.
The CMS bit can change the shift direction of the
common signal. For example, if CMS = 0, COM1/32 is
COM1. If CMS = 1, COM1/32 is COM32.
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