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AS1112
Datasheet - D e t a i l e d D e s c r i p t i o n
Figure 10. Error Detection Timing (GS=FFFF HEX , DC=3F HEX )
LD
>1μs
OEN
GSCLK
SID
Error
Detection
Start
LOD n , LSD n
LOD n+1 , LSD n+1
Error
Detection
End
Note: The rising edge of LD latches new data into the internal registers depending on the logic level of the pin MODE. If the pin MODE is tied
GND, the greyscale registers are updated. If the pin MODE is tied to V CC , the dot correction registers are updated.
Delay Between Outputs (only for AS1112 and AS1112B)
The AS1112 uses graduated delay circuits between OUT n outputs. These circuits are contained in the constant-current driver block of the
AS1112 (see Figure 1 on page 1) . The average-delay time is 30ns (typ).
The maximum delay is 450ns (typ) from OUT0 to OUT15. The delay scheme works by switching on and switching off each output channel. Thus
the on/off time of each channel is the same regardless of the delay. These delays prevent large inrush currents and switching noise that can
reduce bypass capacitance when the outputs are switched on.
OUT n Enable
All OUT n channels can be collectively switched off with one signal. When OEN is set to 1, all OUT n channels are disabled, regardless of the
device logic operations. The greyscale counter is also reset when OEN is set to 1.
When OEN is set to 0, all OUT n channels are in normal operation.
Table 9. Pin OEN Truth Table
OEN
0
1
OUT0:OUT15
Normal Operation
Disabled
Setting Maximum Channel Current
The maximum output current per channel is programmed by a single resistor, R IREF , which is placed between pin I REF and GND. The voltage
on pin I REF is set by an internal band gap V IREF (1.24V typ). The maximum channel current is equivalent to the current flowing through R IREF
multiplied by a factor of 31.5. The maximum output current is calculated as:
I MAX =
V IREF
x 31.5
(EQ 1)
R IREF
Where:
V IREF = 1.24V;
R IREF = User-selected external resistor.
Figure 7 on page 7 shows the maximum output current I OUT versus R IREF , where R IREF is the value of the resistor between I REF terminal to
GND, and I OUT is the constant output current of OUT0:OUT15.
www.austriamicrosystems.com/LED-Driver-ICs/AS1112
Revision 1.13
10 - 19
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