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PDF AS1105 Data sheet ( Hoja de datos )
| Número de pieza | AS1105 | |
| Descripción | Serially interfaced 4-digit LED driver | |
| Fabricantes | ams | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AS1105 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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AS1105 Serially interfaced 4-digit LED driver datasheet
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austriamicrosystems and TAOS are now ams.
www.ams.com
1 page  
AS1105
Datasheet - Electrical Characteristics
6 Electrical Characteristics
VDD = 5V, RSET = 9.53kΩ±1%, TA = TMIN to TMAX, unless otherwise noted.
Table 3. Electrical Characteristics
Symbol
Parameter
Conditions
VDD
IDDSD
IDD
fOSC
Operating Supply Voltage
Shutdown Supply Current
Operating Supply Current
Display Scan Rate
All digital inputs at VDD or GND,
TA = +25ºC
RSET = open circuit
All segments and decimal point on,
ISEG = -40mA
IDIGIT
Digit Drive Sink Current
VOUT = 0.65V
ISEG Segment Drive Source Current
TA = +25ºC, VOUT = (VDD -1V)
ΔISEG
IDIGIT
Segment Drive Current Matching
Digit Drive Source Current
Digit off, VDIGIT = (VDD -0.3V)
ISEG
Logic Inputs
Segment Drive Sink Current
Segment off, VSEG = 0.3V
IIH, IIL
VIH
VIL
VOH
Input Current DIN, CLK, LOAD
Logic High Input Voltage
Logic Low Input Voltage
Output High Voltage
VIN = 0V or VDD
DOUT, ISOURCE = -1mA
VOL Output Low Voltage
Hysteresis Voltage
Timing Characteristics
DOUT, ISINK = 1.6mA
DIN, CLK, LOAD
tCP
tCH
tCL
tCSH
tDS
tDH
tDO
tLDCK
CLK Clock Period
CLK Pulse Width High
CLK Pulse Width Low
CLK Rise to LOAD Rise Hold Time
DIN Setup Time
DIN Hold Time
Output Data Propagation Delay
LOAD Rising Edge to Next Clock
Rising Edge
CLOAD = 50pF
tCSW
tDSPD
Minimum LOAD Pulse High
Data-to-Segment Delay
Min Typ
4.0 5.0
20
330
500 800
320
-30 -40
3.0
-2
5
-1
3.5
VDD - 1
1
100
50
50
0
25
0
50
50
Max Units
5.5 V
50 µA
500 µA
mA
1300 Hz
mA
-45 mA
%
mA
mA
1 µA
V
0.8 V
V
0.4 V
V
ns
ns
ns
ns
ns
ns
25 ns
ns
ns
2.25 ms
www.ams.com/LED-Driver-ICs/AS1105
Revision 1.36
4 - 15
5 Page 
AS1105
Datasheet - Detailed Description
8.8 Display Test Register
With the display test register 0Fh all LED can be tested. In the test mode all LEDs are switched on at maximum brightness (duty cycle 31/32). All
programming of digit and control registers is maintained. The format of the register is given in Table 13.
Table 12. Maximum Segment Current for 1-, 2-, or 3-digit Displays
Number of Digits Displayed
Maximum Segment Current (mA)
1 10
2 20
3 30
Table 13. Display-test Register Format (address (hex) = 0xXF)
Mode
Register Data
D7 D6 D5 D4 D3 D2 D1 D0
Normal Operation X X X X X X X 0
Display Test Mode
X
XXX XX X
1
Note: The AS1105 remains in display-test mode until the display-test register is reconfigured for normal operation.
8.9 No-Op Register (Cascading of AS1105)
The no-operation register 00h is used when AS1105s are cascaded in order to support more than 4 digit displays. The cascading must be done
in a way that all DOUT are connected to DIN of the following AS1105. The LOAD and CLK signals are connected to all devices. For a write
operation for example to the fifth device the command must be followed by four no-operation commands. When the LOAD signal finally goes to
high all shift registers are latched. The first four devices have got no-operation commands and only the fifth device sees the intended command
and updates its register.
8.10 Reset and External Clock Register
This register is addressed via the serial interface. It allows to switch the device to external clock mode (If D0=1 the CLK pin of the serial interface
operates as system clock input.) and to apply an external reset (D1). This brings all registers (except reg. E) to default state. For standard
operation the register contents should be "00h".
Table 14. Reset and external Clock register (address (hex) = 0xXE)
Mode
Address Code
Register Data
(hex)
D7 D6 D5 D4 D3 D2 D1
D0
Normal Operation, internal clock
0xXE
X X X X XX0
0
Normal Operation, external clock
0xXE
X X X X XX0
1
Reset state, internal clock
0xXE
X X X X XX1
0
Reset state, external clock
0xXE
X X X X XX1
1
Table 15. RSET vs. segment current and LED forward voltage
ISEG (mA)
40
30
20
10
1.5
12.2kΩ
17.8kΩ
29.8kΩ
66.7kΩ
2.0
11.8kΩ
17.1kΩ
28.0kΩ
63.7kΩ
VLED(V)
2.5
11.0kΩ
15.8kΩ
25.9kΩ
59.3kΩ
3.0
10.6kΩ
15.0kΩ
24.5kΩ
55.4kΩ
3.5
9.69kΩ
14.0kΩ
22.6kΩ
51.2kΩ
www.ams.com/LED-Driver-ICs/AS1105
Revision 1.36
10 - 15
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AS1105.PDF ] | |
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