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PDF AS1112 Data sheet ( Hoja de datos )
| Número de pieza | AS1112 | |
| Descripción | 16-Channel LED Driver | |
| Fabricantes | austriamicrosystems AG | |
| Logotipo |  |
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AS1112
16-Channel LED Driver with Dot Correction and
Greyscale PWM
Datasheet
1 General Description
2 Key Features
The AS1112 is a 16-channel, constant current-sink LED
driver. Each of the 16 channels can be individually
adjusted by 4096-step greyscale PWM brightness con-
trol and 64-step constant-current sink (dot correction).
The dot correction circuitry adjusts the brightness varia-
tions between the AS1112 channels and other LED driv-
ers. Greyscale control and dot correction circuitry are
accessible via the SPI-compatible serial interface. A sin-
gle external resistor sets the maximum current value of
all 16 channels.
The open & short LED detection function indicates a
broken, shorted or disconnected LED at one or more of
the outputs. The overtemperature flag indicates that the
device is in an overtemperature condition.
Table 1. Standard Products
Model
Power-Down
TEST pin
AS1112 Yes Connect to GND
AS1112B
No
Connect to VCC
An additional power-down pin puts the AS1112 into a
40nA standby-mode.
The AS1112 is available in a 32-pin TQFN 5x5 mm
package.
Figure 1. Block Diagram
1 CLK 2 SDI
32 LD
! 16 Channels
! Greyscale PWM Control: 12-Bit (4096 Steps)
! Dot Correction: 6-Bit (64 Steps)
! Drive Capability (Constant-Current Sink): 0 to 80mA
! LED Power Supply Voltage: Up to 15V
! Supply Voltage Range: 3.0 to 5.5 V
! SPI-Compatible Serial Interface
! Controlled In-Rush Current
! Data Transfer & PWM Clock Rate: up to 30 MHz
! CMOS Level I/O
! Diagnostic Features
- LED Open/Short Detection
- Overtemperature Flag
! 32-pin TQFN 5x5 mm Package
3 Applications
The device is ideal for mono-, multi-, and full-color LED
displays, LED signboards, and display backlights.
29 PD
26
IREF
24
GSCLK
31
OEN
3
MODE
27
VCC
Max OUTn VREF =
Current 1.24V
Greyscale
Counter
Control
Status
Open LED Detect,
Overtemperature
Flag, Dot
Correction Data
Thermal
Flag
Open
LED
Detect
22
XERR
30
GND
AS1112
Input
Shift
Register
Input
Shift
Register
Control
Greyscale
0 Register 11
12-Bit Greyscale
PWM Control
Dot Correction
0 Register 5
6-Bit Dot
Correction
Open&Short LED Detection
Control
Greyscale
12 Register 23
12-Bit Greyscale
PWM Control
Dot Correction
6-Bit Dot
6 Register 11
Correction
. Open&Short LED Detection
.
. Control
Greyscale
180 Register191
12-Bit Greyscale
PWM Control
Dot Correction
90 Register 95
6-Bit Dot
Correction
Open&Short LED Detection
Constant Current
Driver
Delay
x0
Constant Current
Driver
Delay
x1
Constant Current
Driver
Delay
x15
4
OUT0
5
OUT1
.
.
.
21
OUT15
23
SDO
www.austriamicrosystems.com
Revision 1.06
1 - 18
1 page  
AS1112
Datasheet - Electrical Characteristics
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7 Electrical Characteristics
VCC = +3.0 to +5.5V, TAMB = -40 to +85ºC. Typical values are at TAMB = 25°C, VCC = 5V (unless otherwise specified).
Table 6. Electrical Characteristics
Symbol
VOH
VOL
I
ICC
IPD
ICOC
ILEAK
ΔICOC
ΔILNR
ΔILDR
TTEF
TTWF
VLSD
VLOD
VIREF
Parameter
Condition
High-Level Output Voltage
IOH = -1mA, SDO
Low-Level Output Voltage
IOL = 1mA, SDO, XERR
Input Current
VIN = VCC or GND; Pins OEN, TEST,
GSCLK, CLK, SDI, LD
VIN = VCC; pin MODE, PD
VIN = GND; pin MODE, PD
All outputs off, RIREF = 10kΩ
Supply Current
All outputs off, RIREF = 1.3kΩ
All outputs on, RIREF = 1.3kΩ
All outputs on, RIREF = 640Ω
Power Down Current
Constant Output Current
All outputs on, VOUT = 2V,
RIREF = 640Ω
Leakage Output Current
All outputs off, VOUT = 15V,
RIREF = 640Ω, OUT0:OUT15
VOUT = 2V, RIREF = 640Ω,
OUT0:OUT15
VOUT = 2V, RIREF = 480Ω,
OUT0:OUT15
Constant Current Error
Device to device, average current
from OUT0:OUT15, RIREF = 1920Ω
(20 mA)
Device to device, average current
from OUT0:OUT15,
RIREF = 480Ω (80 mA)
Line Regulation
VOUT = 2V, RIREF = 640Ω
OUT0:OUT15
VOUT = 2V, RIREF = 480Ω
OUT0:OUT15
Load Regulation
VOUT = 2 to 4V, RIREF = 640Ω,
OUT0:OUT15
VOUT = 2 to 4V, RIREF = 480Ω,
OUT0:OUT15
Thermal Error Flag Threshold
Junction temperature 1
Thermal Warn Flag Threshold
Junction temperature 1
LED Short Detection
Threshold
VCC = 5V
LED Open Detection
Threshold
Reference Voltage Output
RIREF = 640Ω
Min
VCC -
0.5
-1
-1
54
1.20
Typ
1.2
4
15
30
40
61
20
±3
±3
±3
±3
±1
±1
±0.1
±0.1
150
125
3.6
0.3
1.24
Max
0.5
1
100
1
3
10
20
40
69
±4.5
±4.5
±4.5
±4.5
±2.5
±2.5
±0.5
±0.5
0.4
1.28
Unit
V
V
µA
mA
nA
mA
nA
%
%/V
%/V
ºC
ºC
V
V
V
1. Specified by design. Not tested.
www.austriamicrosystems.com
Revision 1.06
5 - 18
5 Page 
AS1112
Datasheet - Detailed Description
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Power Dissipation
To ensure proper operation of the device, the total power dissipation of the AS1112 must be below the power dissipa-
tion rating of the device package. Total power dissipation is calculated as:
PD = (VCC x ICC) + (VOUT x IMAX x n x DCn dPWM)
63
(EQ 2)
Where:
VCC is the device supply voltage;
ICC is the device supply current;
VOUT is the device OUTn voltage when driving LED current;
IMAX is the LED current adjusted by RIREF;
DCn is the maximum dot correction value for OUTn;
n is the number of OUTn driving LED at the same time;
dPWM is the duty cycle defined by pin OEN or the greyscale PWM value.
Operating Modes
The AS1112 operates in two modes (see Table 11). Greyscale operating mode (see Figure 12 on page 13) and the shift
registers are in reset state at power-up.
Table 11. Operating Modes
Mode
0
1
Input Shift Register
192-bit
96-bit
Operating Mode
Greyscale PWM Mode
Dot Correction Data Input Mode
Setting Dot Correction
The AS1112 can perform independent fine-adjustments to the output current of each channel, i.e., dot correction. Dot
correction is used to adjust brightness deviations of LEDs connected to the output channels (OUT0:OUT15).
The device powers up with the following default seetings: DC = 63 and GS = 4095.
The 16 channels can be individually programmed with a 6-bit word. The channel output can be adjusted in 64 steps
from 0 to 100% of the maximum output current (IMAX). The output current for each OUTn channel can be calculated as:
IOUTn = IMAX x DCn
63
(EQ 3)
Where:
IMAX is the maximum programmable output current for each output;
DCn is the programmed dot correction value for output (DCn = 0 to 63);
n = 0 to 15
Dot correction data are simultaneously entered for all channels. The complete dot correction data format consists of 16
x 6-bit words, which forms a 96-bit serial data packet (see Figure 9). Channel data is put on one by one, and the data
is clocked in with the MSB first.
Figure 9. Dot Correction Data Packet Format
MSB
95
90 89
DC15.5 ... DC15.0 DC14.5
DC OUT15
...
DC OUT14:DC OUT1
65
LSB
0
DC1.0 DC0.5
... DC0.0
DC OUT0
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Revision 1.06
11 - 18
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| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AS1112.PDF ] | |
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