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| 型号： | HCMS-3902 |
| 英文描述： | 3.3 V High Performance CMOS 5x7 AlphaNumeric Displays |
| 中文描述： | 3.3伏高性能CMOS 5x7字母数字显示器 |
| 文件页数： | 10/22页 |
| 文件大小： | 123K |
| 代理商： | HCMS-3902 |
10
Display Overview
The HCMS-39XX series is a
family of LED displays driven by
on-board CMOS ICs. The LEDs
are configured as 5x7 font
characters and are driven in
groups of 4 characters per IC.
Each IC consists of a 160-bit shift
register (the Dot Register), two
7-bit Control Words, and refresh
circuitry. The Dot Register
contents are mapped on a one-to-
one basis to the display. Thus, an
individual Dot Register bit
uniquely controls a single LED.
Eight-character displays have two
ICs that are cascaded. The Data
Out line of the first IC is
internally connected to the Data
In line of the second IC forming a
320-bit Dot Register. The
display’s other control and power
lines are connected directly to
both ICs.
Reset
Reset initializes the Control
Registers (sets all Control
Register bits to logic low) and
places the display in the sleep
mode. The Reset pin should be
connected to the system power
on reset circuit. The Dot
Registers are not cleared upon
power-on or by Reset. After
power-on, the Dot Register
contents are random; however,
Reset will put the display in sleep
mode, thereby blanking the
LEDs. The Control Register and
the Control Words are cleared to
all zeros by Reset.
To operate the display after being
Reset, load the Dot Register with
logic lows. Then load Control
Word 0 with the desired
brightness level and set the sleep
mode bit to logic high.
Dot Register
The Dot Register holds the
pattern to be displayed by the
LEDs. Data is loaded into the Dot
Register according to the
procedure shown in Table 1 and
Figure 5.
First RS is brought low, then CE
is brought low. Next, each
successive rising CLK edge will
shift in the data at the D
IN
pin.
Loading a logic high will turn the
corresponding LED on; a logic
low turns the LED off. When all
160 bits have been loaded (or
320 bits in an 8-digit display), CE
is brought to logic high.
When CLK is next brought to
logic low, new data is latched into
the display dot drivers. Loading
data into the Dot Register takes
place while the previous data is
displayed and eliminates the need
to blank the display while loading
data.
Table 1. Register Truth Table
Function
CLK
CE
RS
Select Dot Register
Not Rising
↓
L
Load Dot Register
D
IN
= HIGH LED = “ON”
D
IN
= LOW LED = “OFF”
↑
L
X
Copy Data from Dot Register to Dot Latch
L
H
X
Select Control Register
Not Rising
↓
H
Load Control Register
[1,3]
↑
L
X
Latch Data to Control Word
[2]
L
H
X
Notes:
1. BIT D
0
of Control Word 1 must have been previously set to Low for serial mode or High for simultaneous mode.
2. Selection of Control Word 1 or Control Word 0 is set by D
7
of the Control Shift Register. The unselected control word retains its previous value.
3. Control Word data is loaded Most Significant Bit (D
7
) first.
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| HCMS-3904 | 功能描述:LED 显示器和配件 Orange 588nm 1x4 Alphanumeric RoHS:否 制造商:Avago Technologies 显示器类型:7 Segment 数位数量:2 字符大小:7.8 mm x 14.22 mm 照明颜色:Red 波长:628 nm 共用管脚:Common Anode 工作电压:2.05 V 工作电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 35 C 封装:Tube |
| HCMS-3906 | 功能描述:LED 显示器和配件 Red 624nm 1x4 Alphanumeric RoHS:否 制造商:Avago Technologies 显示器类型:7 Segment 数位数量:2 字符大小:7.8 mm x 14.22 mm 照明颜色:Red 波长:628 nm 共用管脚:Common Anode 工作电压:2.05 V 工作电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 35 C 封装:Tube |
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