PT6554_10 Datasheet, PDF (9/30 Pages) Princeton Technology Corp – LCD Driver IC

PT6554
SEGMENT ON / OFF CONTROL BIT: SC
SC is the control bit used to control the state (ON or OFF) of the Segment Drivers. Please refer to the table below. It
should be noted that turning OFF the Segment by setting SC Bit means that the Segments are turned OFF by outputting
segment OFF waveforms from the Segment Driver Output Pins.
SC
Display state
0
On
1
Off
1/2 BIAS OR 1/3 BIAS DRIVE TECHNIQUE SELECT BIT: DR
DR is the control bit used to select either the 1/2 or 1/3 Bias Drive Technique. Please refer to the table below.
DR
Drive scheme
0
1/3 bias drive
1
1/2 bias drive
KEY OUTPUT DATA BITS: KD1 TO KD30
KD1 to KD30 are key data bits of the key matrix formed by the KS1 to KS6 lines and the KI1 to KI5 lines. Please refer to
the table below for the correspondence between the output pins – KS1 to KS6, input pins KI1 to KI5 and the Key Data
Bits KD1 to KD30.
KI1
KI2
KI3
KI4
KI5
KS1/SG40 KD1 KD2 KD3 KD4 KD5
KS2/SG41 KD6 KD7 KD8 KD9 KD10
KS3
KD11 KD12 KD13 KD14 KD15
KS4
KD16 KD17 KD18 KD19 KD20
KS5
KD21 KD22 KD23 KD24 KD25
KS6
KD26 KD27 KD28 KD29 KD30
Note: Output Pins – SG40/KS1 and SG41/KS2 are used as Key Scan Output Pins.
As stated earlier, key matrix having up to a maximum of 30 keys may be constructed using the KS1 to KS6 and KI1 to
KI5 lines. If any one of the keys is pressed, the corresponding key output data is set to 1. For example, the key data bit,
KD23 is set to “1”, when the corresponding key is pressed.
If the output pins, SG40/KS1 and SG41/KS2 are used as Segment Driver Output Pins (by setting the K1 and K0 control
bits), a key matrix having up to a maximum of 20 keys may be constructed using the KS3 to KS6 and KI1 to KI5 lines.
The key output data bits KD1 to KD10 are set to 0.
SLEEP ACKNOWLEDGE DATA BIT: SA
SA is an output data bit that is used to set the state when the key is pressed. When DO is in “LOW” state and the serial
data is inputted, then the mode can be set either to Normal or Sleep Mode during this period. SA will be “1” in sleep mode
and “0” in normal mode.
V1.4
9
June 2010