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AS1116
Datasheet - D e t a i l e d D e s c r i p t i o n
Display-Test Mode
The AS1116 can detect open or shorted LEDs. Readout of either open LEDs (D2=1) or short LEDs (D1=1) is possible, as well as a OR relation of
open and short (D1=D2=1). After a diagnostic run bit D4 can be read to clarify if an error occurred before reading out detailed diagnostic data.
Note: All settings of the digit- and control-registers are maintained.
Table 13. Testmode Register Summary
D7
X
D6
REXT_short
D5
REXT_open
D4
LED_global
D3
LED_test
D2
LED_open
D1
LED_short
D0
DISP_test
Table 14. Testmode Register Bit Description (Address (HEX) = 0x0F))
Addr: 0x0F
Address
Bit
Bit Name
Default
Access
D7:D0
Optical display test. (Testmode for external visual test.)
D0
DISP_test
0
W
0: Normal operation; 1: Run display test (All digits are tested independently
from scan limit & shutdown register.)
D1
D2
D3
D4
D5
D6
D7
LED_short
LED_open
LED_test
LED_global
REXT_open
REXT_short
0
0
0
0
0
0
0
W
W
R
R
R
R
-
Starts a test for shorted LEDs. (Can be set together with D2)
0: Normal operation; 1: Activate testmode
Starts a test for open LEDs. (Can be set together with D1)
0: Normal operation; 1: Activate testmode
Indicates an ongoing open/short LED test
0: No ongoing LED test; 1: LED test in progress
Indicates that the last open/short LED test has detected an error
0: No error detected; 1: Error detected
Checks if external resistor R EXT is open
0: R EXT correct; 1: R EXT is open
Checks if external resistor R EXT is shorted
0: R EXT correct; 1: R EXT is shorted
Not used
LED Diagnostic Registers
These eight registers contain the result of the LED open/short test for the individual LED of each digit.
Table 15. LED Diagnostic Register Address
Register
Segment
Register
Segment
HEX
Address
Digit
D7
D6
D5
D4
D3
D2
D1
D0
HEX
Address
Digit
D7
D6
D5
D4
D3
D2
D1
D0
0x14
DIG0
0x18
DIG4
0x15
0x16
DIG1
DIG2
DP
A
B
C
D
E
F
G
0x19
0x1A
DIG5
DIG6
DP
A
B
C
D
E
F
G
0x17
DIG3
0x1B
DIG7
Note: If more than 2 shorts occure in the LED array, detection of individual LED fault could become limited to blocs.
Revision 1.08
14 - 23
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