HT16515(2003) Ver la hoja de datos (PDF) - Holtek Semiconductor
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HT16515 Datasheet PDF : 12 Pages
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HT16515
The key matrix is made up of a 16´2 matrix, as shown below.
S 1/ S 2/ S 3/ S 4/ S 5/ S 6/ S 7/ S 8/ S 9/ S 10/ S 11/ S 12/ S 13/ S 14/ S 15/ S 16/
K1
K2
K3
K4
K5
K6
K7
K8
K9
K 10 K 11
K 12 K 13 K 14 K 15 K 16
KEY1
KEY2
The data of each key is stored as illustrated below, and
is read with the read command, starting from the least
significant bit.
K ey1 K ey2
S 1 /K 1
S 5 /K 5
S 9 /K 9
S 1 3 /K 1 3
b0 b1
K ey1 K ey2
S 2 /K 2
S 6 /K 6
S 1 0 /K 1 0
S 1 4 /K 1 4
b2 b3
K ey1 K ey2
S 3 /K 3
S 7 /K 7
S 1 1 /K 1 1
S 1 5 /K 1 5
b4 b5
K ey1 K ey2
S 4 /K 4
S 8 /K 8
S 1 2 /K 1 2
S 1 6 /K 1 6
b6 b7
R e a d in g S e q u e n c e
LED Port
The LED port is of the CMOS output configuration.
Data is written to the LED port with the write command,
starting from the least significant bit. In our application
(see application circuits), the user adopts an internal
NMOS device to a driver LED component by connecting
VDD. When a bit of this port is 0, the corresponding LED
lights up; when the bit is 1, the LED turns off. The data of
bits 4 through 7 are ignored.
M SB
D o n 't c a r e
LS B
b3 b2 b1 b0
LE D 0
LE D 1
LE D 2
LE D 3
Commands
Commands set the display mode and status of the VFD
driver.
The first 1 byte input to the HT16515 through the DI pin
after the CS pin has fallen, is regarded as a command. If
CS is set high while commands/data are transmitted,
serial communication is initialized, and the commands/
data being transmitted are not valid (however, the com-
mands/data previously transmitted remains valid).
· Display mode setting commands
These commands initialize the HT16515 and select
the number of segments and the number of grids
(1/4~1/12 duty, 16 to 24 segments).
When these commands are executed, the display is
forcibly turned off, and key scanning is also stopped.
To resume display, the display command ²ON² must
be executed. If the same mode is selected, nothing
happens.
M SB
LS B
00
b3 b2 b1 b0
D o n 't c a r e
S e le c ts D is p la y M o d e
0 0 0 0 : 4 d ig its , 2 4 s e g m e n ts
0 0 0 1 : 5 d ig its , 2 3 s e g m e n ts
0 0 1 0 : 6 d ig its , 2 2 s e g m e n ts
0 0 1 1 : 7 d ig its , 2 1 s e g m e n ts
0 1 0 0 : 8 d ig its , 2 0 s e g m e n ts
0 1 0 1 : 9 d ig its , 1 9 s e g m e n ts
0 1 1 0 : 1 0 d ig its , 1 8 s e g m e n ts
0 1 1 1 : 1 1 d ig its , 1 7 s e g m e n ts
1 x x x : 1 2 d ig its , 1 6 s e g m e n ts
Note: Power-on status: 12-digit, 16 segment mode is
selected.
Rev. 1.00
6
December 19, 2003
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