AS1121-BQFT austriamicrosystems, AS1121-BQFT Datasheet - Page 7

• Manufacturer Part Number: AS1121-BQFT
• Description: IC LED DRIVER 16-CH 30V 32-TQFN
• Manufacturer: austriamicrosystems

Specifications of AS1121-BQFT

• Constant Current: Yes
• Internal Driver: Yes
• Type - Primary: Backlight, General Purpose
• Type - Secondary: Color
• Mounting Type: *
• Topology: PWM
• Number Of Outputs: 16
• Voltage - Supply: 3.1 V ~ 3.6 V
• Voltage - Output: 1.5 V ~ 30 V
• Package / Case: *
• Operating Temperature: -40°C ~ 85°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency: -
• Other names: AS1121-BQFTTR

AS1121
Datasheet - D e t a i l e d D e s c r i p t i o n
7 Detailed Description
Serial Interface
The AS1121 features a versatile 3-pin (CLK, SDI, and SDO) serial interface, which can be connected to microcontrollers or digital signal proces-
sors in various configurations.
The rising edge of the CLK signal shifts data from pin SDI to the internal register. After all data is clocked in, the serial data is latched into the
internal registers at the rising edge of the LD signal.
Note: All data is clocked in with the MSB first.
Multiple AS1121 devices can be cascaded by connecting the SDO pin of one device with pin SDI of the next device
The SDO pin can also be connected to the microcontroller to receive status information from the AS1121. The serial data format is 96-bit or 192-
bit wide, depending on mode of the device
Figure 3. Serial Data Input Timing Diagram
www.austriamicrosystems.com/LED-Driver-ICs
MODE
SDO
CLK
SDI
LD
DCn-1
LSB
DCn-1
MSB
MSB
DCn
1
Dot Correction Mode
MSB-1
DCn-1
Data Input Cycle
DCn-1
LSB
(see LD on page
96
DCn
LSB
t
H2
MSB
DCn
t
H3
t
SU2
2).
MSB
GSn
1
Revision 1.00
X
t
SU3
Greyscale Mode
Data Input Cycle
X
192
GSn
LSB
t
H3
MSB
SID
t
SU2
(see Figure 11 on page
DCn+1
Dot Correction Mode
MSB
Data Input Cycle
1
X
MSB-1
DCn-1
2
7 - 18
14).