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PDF BCT72328S Data sheet ( Hoja de datos )
| Número de pieza | BCT72328S | |
| Descripción | LED Display Driver and Key Scan | |
| Fabricantes | BlueChips | |
| Logotipo |  |
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BlueChips Technology
A premier Mixed Signal Product Company
BCT72328S
LED Display Driver and Key Scan
General Description
The BCT72328S is a LED Display Driver and Key Scan with 8-steps digital
dimming control. Ten segment output lines, seven grid output lines, one
display memory (14 bytes), control circuit, key scan circuit are all
incorporated into a single chip to build a highly reliable peripheral device for a
single chip micro computer. Serial data is fed to BCT72328S via a four-line
serial interface (DIN, STB, CLK and DOUT).
Differences with respect to
uPD16312 VFD Driver
• No LED Ports supported
• No GPIO’s supported
• Less Segments and Grids
output lines
• No negative and 3.3V voltage
supply required
Applications
• Front Panel Display for DVD Player and
VCD player
• Boom-box system and Electrical
Appliance
Package
Features
• CMOS Technology
• Low Power Consumption
• Key Scanning (10 x 2 matrix)
• Multiple Display Modes:
11 segments, 6 digits to
10 segments, 7 digits
• 8-Steps Dimming Circuitry
• Serial Interface for Clock, Data
Input, Data Output, Strobe Pins
• No External Resistors Needed
for Driver Outputs
• Available in Pb-free SOP28
package or die
72328.1V4.2005.9.01
Page 1
Free Datasheet http://www.Datasheet4U.com
1 page  
BlueChips Technology
A premier Mixed Signal Product Company
BCT72328S
LED Display Driver and Key Scan
Key matrix and key scan data RAM
The key matrix scans the series key states at each level of the key strobe signal
(SG1/KS1~SG10/KS10) output of the BCT72328S. The key strobe signal outputs are
time-multiplexed signals from SG1/KS1~SG10/KS10. The states of inputs K1~K2 are
sampled by strobe signal and latched SG1/KS1~SG10/KS10 into the registers.
K1
K2
SG1/ SG2/ SG3/ SG4/ SG5/ SG6/ SG7/ SG8/ SG9/ SG10/
KS1 KS2 KS3 KS4 KS5 KS6 KS7 KS8 KS9 KS10
The data of each key is stored in key scan data RAM as illustrated below, and is
read with the read command, starting from the least significant bit. This chip does not
have any built-in key debounce function; the key debounce operation is performed
by user software. The key scan data RAM is re-new at the end of two successive
frames as shown in Figure 5.
Reading Sequence
K1 - K2
K1 - K2
K1 - K2 K1 - K2
SG1/KS1
SG5/KS5
SG9/KS9
b0 - b1
SG2/KS2
SG6/KS6
SG10/KS10
b2 - b3
SG3/KS3
SG7/KS7
00
b4 - b5
SG4/KS4
SG8/KS8
00
b6 - b7
72328.1V4.2005.9.01
Page 5
Free Datasheet http://www.Datasheet4U.com
5 Page 
BlueChips Technology
A premier Mixed Signal Product Company
BCT72328S
LED Display Driver and Key Scan
RECOMMENDED SOFTWARE FLOWCHART
START
SET COMMAND 4
(80H-87H: Display OFF)
(See Note 5)
SET COMMAND 2
(Write Data)
SET COMMAND 3
Clear Display RAM
(See Note 6)
SET COMMAND 1
SET COMMAND 4
(88H-8FH: Display ON)
INITIAL
SETTING
MAIN PROGRAM
SET COMMAND 2
(Read Key & Write Data
included)
SET COMMAND 3
MAIN
LOOP
SET COMMAND 1
SET COMMAND 4
END
NOTE:
1) Command 1: Display Mode Commands
2) Command 2: Data Setting Commands
3) Command 3: Address Setting Commands
4) Command 4: Display Control Commands
5) When IC power is applied for the first time, the display is turned off; but it is advisable to keep the
display OFF when modifying the Display RAM.
6) When IC power is applied for the first time, the contents of the Display RAM are not defined; thus
it is strongly suggested that the contents of the Display RAM must be cleared during the initial
setting.
72328.1V4.2005.9.01
Page 11
Free Datasheet http://www.Datasheet4U.com
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet BCT72328S.PDF ] | |
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