AS1109-BSOT austriamicrosystems, AS1109-BSOT Datasheet - Page 12

• Manufacturer Part Number: AS1109-BSOT
• Description: IC LED 4-BIT CC DRIVER 16-SOIC
• Manufacturer: austriamicrosystems
• Type: General Purposer

Specifications of AS1109-BSOT

• Constant Current: *
• Constant Voltage: *
• Topology: *
• Number Of Outputs: *
• Internal Driver: *
• Type - Primary: *
• Type - Secondary: *
• Frequency: *
• Voltage - Supply: *
• Voltage - Output: *
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Operating Temperature: *
• Current - Output / Channel: *
• Internal Switch(s): Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Efficiency: -
• Other names: AS1109-BSOTTR

AS1109
Datasheet - D e t a i l e d D e s c r i p t i o n
Error Detection Functions
Open-LED Detection
The AS1109 open-LED detection is based on the comparison between V
OEN and stored internally. While detecting open-LEDs the output port must be turned on. Open LED detection can be started with 1 clock pulse
during error detection mode while the output port is turned on.
Note: LEDs which are turned off at test time cannot be tested.
Table 6. Open LED Detection Modes
Shorted-LED
The AS1109 shorted-LED detection is based on the comparison between V
edge of OEN and stored internally. While detecting shorted-LEDs the output port must be turned on. Shorted-LED detection can be started with
2 clock pulses during error detection mode while the output port is turned on.
For valid results, the voltage at OUTN0:OUTN7 must be lower then V
achieved by reducing the V
Note: LEDs which are turned off at test time cannot be tested.
Table 7. Shorted LED Detection Modes
Overtemperature
Thermal protection for the AS1109 is provided by continuously monitoring the device’s core temperature. The overtemperature status is aquired
at the rising edge of OEN and stored internally.
Table 8. Overtemperature Modes
www.austriamicrosystems.com/LED-Driver-ICs/AS1109
Output Port State
Output Port State
Output Port State
Don’t Care
Don’t Care
On
On
On
On
LED
voltage or by adding additional diodes, resistors or LED’s.
Temperature > T
Temperature < T
Point Conditions
Point Conditions
Point Conditions
Effective Output
Effective Output
Effective Output
V
V
V
V
DS
DS
DS
DS
> V
< V
< V
> V
THH
THH
THL
THL
OV1
OV1
Revision 1.20
THH
DS
under low-current diagnostic mode operating conditions. This can be
DS
and V
Detected Overtemperature
and V
Detected Shorted-LED
Detected Open-LED
THL
Error Status Code
Error Status Code
THH
Status Code
. The open LED status is aquired at the rising edge of
. The shortened LED status is aquired at the rising
0
1
0
1
0
1
Overtemperature Condition
Open Circuit
Short Circuit
Meaning
Meaning
Meaning
Normal
Normal
Normal
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