AS1112-BQFT austriamicrosystems, AS1112-BQFT Datasheet - Page 13

• Manufacturer Part Number: AS1112-BQFT
• Description: IC DRIVER LED 16-CHAN 32-TQFN
• Manufacturer: austriamicrosystems
• Type: Constant Currentr

Specifications of AS1112-BQFT

• Constant Current: Yes
• Topology: PWM
• Number Of Outputs: 16
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: Color
• Frequency: 30MHz
• Voltage - Supply: 3 V ~ 5.5 V
• Voltage - Output: 15V
• Mounting Type: Surface Mount
• Package / Case: 32-VQFN
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 69mA
• Internal Switch(s): Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Efficiency: -

AS1112
Datasheet - D e t a i l e d D e s c r i p t i o n
Figure 12. Greyscale Data Input Timing Diagram
Status Information Data (SID)
The AS1112 contains an integrated status information register, which can be accessed in greyscale mode (MODE = GND). Once the LD signal
latches the data into the greyscale register, the input shift register data is replaced with status information data
Open, shorted LED, temperature warning and overtemperature flags as well as the dot-correction registers can be read out at pin SDO. The sta-
tus information data packet is 192 bits wide. Bits 191:176 and 31:16 contain the open LED detection status of each channel (either 191:176 or
31:16 can be used for readout). Bit 175 contains the thermal error flag status. Bit 174 contains the temperature warning flag. Bits 167:72 contain
the data of the dot-correction register. Bit 15:0 contains the LED shorted flags. The remaining bits are reserved. The complete status information
data packet is shown in
Figure 13. Status Information Data Packet Format
Greyscale PWM Operation
The falling edge of the OEN signal initiates a greyscale PWM cycle. The first GSCLK pulse after the falling edge of OEN increments the grey-
scale counter by one and switches on any OUTn whose greyscale value does not equal zero. Each subsequent rising edge of GSCLK incre-
ments the greyscale counter by one.
The AS1112 compares the greyscale value of each OUTn channel with the greyscale counter value. All OUTn whose greyscale values equal the
counter values are switched off. A OEN = 1 signal after 4096 GSCLK pulses resets the greyscale counter to zero and completes a greyscale
PWM cycle
www.austriamicrosystems.com/LED-Driver-ICs/AS1112
MODE
SDO
CLK
SDI
72:167
LD
16:31
32:71
Bit #
0:15
LOD15
MSB
Dot Correction Mode
191
Data Input Cycle
MSB-1
DCn-1
(see Figure
Open LED
Detect
...
96
LED Open Detection (Optional, same as bits 176:191), LOD
DCn-1
LSB
t
H2
DCn-1
MSB
Figure
14).
t
H3
LOD0
176
Dot Correction Readback (16 x 6 Bit)
13.
t
SU2
LED Short Detection, LSD
x
TEF
Overtempera-
MSB
175
GSn
Data Input Cycle After Dot Correction Input
t
1
H0
ture
Description
Undefined
x
TWF
t
174
SU3
1st Greyscale Mode
x
t
SU1
...
192
t
H3
168
X
Revision 1.09
GSn
LSB
DC15.
167
SIDn
MSB
DC Values
168:173
176:191
Bit #
174
175
...
GSn+1
MSB
DC0.
1
72
Following Greyscale Mode
MSB-1
SIDn
Temperature Warning Flag (TWF, 125ºC, typ)
t
PD0
Temperature Error Flag (TEF, 150ºC, typ)
Data Input Cycle
71
X
MSB-2
LED Open Detection, LOD
SIDn
GSn+1
(see Figure
Description
LSB
Undefined
192
...
SIDn
LSB
16:31
LOD
13).
LSB
0:15
LSD
SIDn
MSB
13 - 19