PT6964_10 Datasheet, PDF (6/15 Pages) Princeton Technology Corp – LED Driver IC

PT6964 KEY MATRIX & KEY INPUT DATA STORAGE RAM
PT6964 Key Matrix consists of 10 x 2 array as shown below:
PT6964
Each data entered by each key is stored as follows and read by a READ Command, starting from the last significant bit.
When the most significant bit of the data (b7) has been read, the least significant bit of the next data (b0) is read.
K1……………………...K2 K1………………………K2
SG1/KS1
SG2/KS2
x
SG3/KS3
SG5/KS5
SG7/KS7
SG4/KS4
SG6/KS6
SG8/KS8
x
x
x
Reading
Sequence
SG9/KS9
SG10/KS10
x
b0………………………b1 b3………………………..b4 b6………………………b7
Note: b6 and b7 do not care.
COMMANDS 3: ADDRESS SETTING COMMANDS
Address Setting Commands are used to set the address of the display memory. The address is considered valid if it has
a value of 00H to 0DH. If the address is set to 0EH or higher, the data is ignored until a valid address is set. When power
is turned ON, the address is set at 00H.
Please refer to the diagram below.
MSB
LSB
1 1 - - b3 b2 b1 b0
Not relevant Address: 00H to 0DH
DISPLAY MODE AND RAM ADDRESS
Data transmitted from an external device to PT6964 via the serial interface are stored in the Display RAM and are
assigned addresses. The RAM addresses of PT6964 are given below in 8 bits unit.
SG1
SG4 SG5
SG8 SG9 SG10
X
SG12 SG13
SG14
00HL
00HU
01HL
-
01HU
DIG1
02HL
02HU
03HL
-
03HU
DIG2
04HL
04HU
05HL
-
05HU
DIG3
06HL
06HU
07HL
-
07HU
DIG4
08HL
08HU
09HL
-
09HU
DIG5
0AHL
0AHU
0BHL
-
0BHU
DIG6
0CHL
0CHU
0DHL
-
0DHU
DIG7
Note: X = Not relevant
b0
b3 b4
b7
xxHL
xxHU
Lower 4 bits
Higher 4 bits
V1.4
6
October 2009