www.austriamicrosystems.com/LED-Driver-ICs/AS1113

Revision 1.04

12 - 24

AS1113

Datasheet - D e t a i l e d D e s c r i p t i o n

If there are multiple AS1113s in a chain, the error flag will be gated through all devices. To get a valid result at the end

of the chain, a logic 1 must be applied to the SDI input of the first device of the chain. If one device produces an error

ble to identify which device in the chain produced the error. Therefore, if a global error occurs, the detailed error report

can be run to identify which AS1113, or LED produced the error.

Note: When no error has occurred, the detailed error report can be skipped, setting LD and subsequently OEN low.

Error Detection Functions

Open-LED Detection

at the rising edge of 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 and will be shown as a logic 1 in the detailed error

report.

Shorted-LED

aquired at the rising 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.

Note: LEDs which are turned off at test time cannot be tested and will be shown as a logic 1 in the detailed error

report.

Overtemperature

Thermal protection for the AS1113 is provided by continuously monitoring the device’s core temperature. The overtem-

perature status is aquired at the rising edge of OEN and stored internally.

Table 6. Open LED Detection Modes

Output Port State

Effective Output

Point Conditions

Detected Open-LED

Error Status Code

Meaning

On

0

Open Circuit

On

1

Normal

Table 7. Shorted LED Detection Modes

Output Port State

Effective Output

Point Conditions

Detected Shorted-LED

Error Status Code

Meaning

On

0

Short Circuit

On

1

Normal

Table 8. Overtemperature Modes

Output Port State

Effective Output

Point Conditions

Detected Overtemperature

Status Code

Meaning

Don’t Care

0

Overtemperature

Condition

Don’t Care

1

Normal