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PDF AS1105 Data sheet ( Hoja de datos )
| Número de pieza | AS1105 | |
| Descripción | Serially Interfaced 4-Digit LED Driver | |
| Fabricantes | AMSCO | |
| Logotipo |  |
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Data Sheet AS1105
Serially Interfaced, 4-Digit LED Driver
AS1105
DATA SHEET
Every individual segment can be addressed and updated
Key Features
- Cost effective version of AS1100 functionality for
applications up to 4-Digits
- 10MHz Serial Interface
- Individual LED Segment Control
- Decode/No-Decode Digit Selection
- 20µA Low-Power Shutdown (Data Retained)
- Extremely low Operating Current 0.5mA in open loop
- Digital and Analog Brightness Control
- Display Blanked on Power-Up
- Drive Common-Cathode LED Display
separately. Only one external resistor is required to set the
current through the LED display. Brightness can be
controlled either in an analog or digital way. The user can
choose the internal code-B decoder to display numeric
digits or to address each segment directly. The AS1105
features an extremely low shutdown current of only 20µA.
and an operational current of less than 500µA. The number
of visible digits can be programmed as well. The AS1105
can be reset by software and an external clock can be used.
Several test modes support easy debugging.
AS1105 is offered in a 20 SOIC package.
- Software Reset1
- Optional External clock
- 20 pin SO Packages
Applications
- Bar-Graph Displays
General Description
The AS1105 is an LED driver for 7 segment numeric
displays of up to 4 digits. The AS1105 can be programmed
via a conventional 4 wire serial interface. It includes a BCD
- Industrial Controllers
- Panel Meters
- LED Matrix Displays
- White Goods
code-B decoder, a multiplex scan circuitry, segDmaetnatSahnedet4U.com
display drivers and a 32 Bit memory. The memory is used to
DataShee
store the LED settings, so that continuous reprogramming is
not necessary.
TOP
DOUT 1
DIN 2
DIG0 3
GND 4
DIG2 5
DIG3 6
GND 7
DIG1 8
LOAD 9
CLK 10
AS1105
20 SEG D
19 SEG DP
18 SEG E
17 SEG C
16 VDD
15 ISET
14 SEG G
13 SEG B
12 SEG F
11 SEG A
Pin Configuration
SO
9.53k
MOSI
µP I/O
SCK
+5V
VDD
ISET
DIN
DIG0-DIG3
4 Digits
LOAD
CLK
GND
SEG A-G
SEP DP
GND
8 Segments
Typical Application Circuit
4-Digit µP Display
1 Software Reset and external clock are not supported by
MAX7219
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Data Sheet AS1105
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Decode-Mode Register
should be adjusted accordingly. Table 9 shows the
In the AS1105 a BCD decoder is included. Every digit can
maximum allowed current, when fewer than 4 digits are
be selected via register 09h to be decoded. The BCD code
used. To avoid differences in brightness the scan limit
consists of the numbers 0-9, E,H, L,P and -. In register 09h
register should not be used to blank portions of the display
a logic high enables the decoder for the appropriate digit. In
(leading zeros).
case that the decoder is bypassed (logic low) the data Bits
D7-D0 correspond to the segment lines of the AS1105. In
table 4 some possible settings for register 09h are shown.
Register
Address
Hex
D15–D12 D11 D10 D9 D8 Code
Bit D7, which corresponds to the decimal point, is not
No-Op
X 0 0 0 0 0xX0
affected by the settings of the decoder. Logic high means
that the decimal point is displayed. In table 5 the font of the
Code B decoder is shown. In table 6 the correspondence of
the register to the appropriate segments of a 7 segment
display is shown (see figure 2)
Intensity Control and Interdigit Blanking
Brightness of the display can be controlled in an analog way
by changing the external resistor (RSET). The current, which
flows between VDD and ISET, defines the current that flows
through the LEDs. The LED current is 100 times the ISET
current. The minimum value of RSET should be 9.53kΩ,
which corresponds to 40mA segment current. The
brightness of the display can also be controlled digitally via
register 0Ah. The brightness can be programmed in 16
Digit 0
X 0 0 0 1 0xX1
Digit 1
X 0 0 1 0 0xX2
Digit 2
X 0 0 1 1 0xX3
Digit 3
X 0 1 0 0 0xX4
Decode
Mode
X 1 0 0 1 0xX9
Intensity
X 1 0 1 0 0xXA
Scan Limit X 1 0 1 1 0xXB
Shutdown X 1 1 0 0 0xXC
Not used
X 1 1 0 1 0xXD
Reset and
ext. Clock
X
1 1 1 0 0xXE
Display
Test
X 1 1 1 1 0xXF
steps and is shown in table 7. An internal pulse width
Table 2: Register address map
modulator controls the intensity of the display. DataSheet4U.com
Scan-Limit Register
Mode
Address Code
Register Data
DataShee
(Hex) D7 D6 D5 D4 D3 D2 D1 D0
The scan limit register 0Bh selects the number of digits
displayed. When all 4 digits are displayed the update
frequency is typically 800Hz. If the number of digits
displayed is reduced, the update frequency is reduced as
well. The frequency can be calculated using 8fOSC/N,
Shutdown
Mode
Normal
Operation
0xXC
0xXC
XXXXXXX0
XXXXXXX1
where N is the number of digits. Since the number of
Table 3: Shutdown register format (address (hex) = 0xXC)
displayed digits influences the brightness, the resistor RSET
Decode Mode
D7
D6
Register Data
D5 D4 D3 D2
D1
D0 Hex Code
No decode for digits 4–0 0 0 0 0 0 0 0 0 0x00
Code B decode for digit 0
No decode for digits 4–1
0
0
0
0
0
0
0
1
0x01
Code B decode for digits
3–0
00001111
0x0F
Code B decode for digits
4–0
11111111
0xFF
Table 4: Decode-mode register examples (address (hex) = 0xX9)
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Data Sheet AS1105
Figure 4: SOIC-20 package dimensions
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Segment Driver Capability, VDD = 5V, Logic Level = High
50
Upper Limit
45
40
35
Lower Limit
30
25
20
15
10
5
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
Voltage below VDD at output in V
Figure 5: Segment driver capability
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| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AS1105.PDF ] | |
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