Data Sheet

www.austriamicrosystems.com/LED-Driver-ICs/AS1115 Revision 1.08 16 - 25
AS1115
Datasheet - D e t a iled D e s c r iptio n
Display-Test Mode
The AS1115 can detect open or shorted LEDs. Readout of either open LEDs or short LEDs is possible, as well as a OR relation of open and
short.
Note: All settings of the digit- and control-registers are maintained.
LED Diagnostic Registers
These eight registers contain the result of the LED open/short test for the individual LED of each digit.
No
te: If one or more short occures in the LED array, detection of individual LED fault could become ambiguous.
Intensity Control Register (0x0A)
The brightness of the display can be controlled by digital means using the Intensity Control Registers and by analog means using RSET (see
Selecting RSET Resistor Value and Using External Drivers on page 19). The intensity can be controlled globally for all digits, or
for each digit individually. The global intensity command will write intensity data to all four individual brightness registers, while the individual
intensity command will only write to the associated individual intensity register.
Table 14. Testmode Register Summary
D7 D6 D5 D4 D3 D2 D1 D0
X RSET_short RSET_open LED_global LED_test LED_open LED_short DISP_test
Table 15. Testmode Register Bit Description (Address (HEX) = 0x0F))
Addr: 0x0F Address
Bit Bit Name Default Access D7:D0
D0 DISP_test 0 W
Optical display test. (Testmode for external visual test.)
0: Normal operation; 1: Run display test (All digits are tested independently
from scan limit & shutdown register.)
D1 LED_short 0 W
Starts a test for shorted LEDs. (Can be set together with D2)
0: Normal operation; 1: Activate testmode
D2 LED_open 0 W
Starts a test for open LEDs. (Can be set together with D1)
0: Normal operation; 1: Activate testmode
D3 LED_test 0 R
Indicates an ongoing open/short LED test
0: No ongoing LED test; 1: LED test in progress
D4 LED_global 0 R
Indicates that the last open/short LED test has detected an error
0: No error detected; 1: Error detected
D5 RSET_open 0 R
Checks if external resistor RSET is open
0: RSET correct; 1: RSET is open
D6 RSET_short 0 R
Checks if external resistor RSET is shorted
0: RSET correct; 1: RSET is shorted
D7 0
- Not used
Table 16. LED Diagnostic Register Address
Register
HEX
Address
Segment Register
HEX
Address
Segment
Digit D7 D6 D5 D4 D3 D2 D1 D0 Digit D7 D6 D5 D4 D3 D2 D1 D0
0x14
DIG0
DP A B C D E F G
0x18
DIG4
DP A B C D E F G
0x15
DIG1
0x19
DIG5
0x16
DIG2
0x1A
DIG6
0x17
DIG3
0x1B
DIG7
ams AG
Technical content still valid