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AS1115
Datasheet - D e t a i l e d D e s c r i p t i o 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.
Table 14. Testmode Register Summary
D7
X
D6
RSET_short
D5
RSET_open
D4
LED_global
D3
LED_test
D2
LED_open
D1
LED_short
D0
DISP_test
Table 15. 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
RSET_open
RSET_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 SET is open
0: R SET correct; 1: R SET is open
Checks if external resistor R SET is shorted
0: R SET correct; 1: R SET 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 16. 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 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 R SET (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.
Revision 1.08
16 - 25
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