AS1116-BSST(2009) 데이터 시트보기 (PDF) - austriamicrosystems AG
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AS1116-BSST Datasheet PDF : 20 Pages
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AS1116
Datasheet - Detailed Description
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 dignostic run bit D4 can be read to clearify 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
D6
D5
D4
X REXT_short REXT_open 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
D0
DISP_test
Optical display test. (Testmode for external visual test.)
0
W 0: Normal operation; 1: Run display test (All digits are tested
independently from scan limit & shutdown register.)
D1
LED_short
D2
LED_open
Starts a test for shorted LEDs. (Can be set together with D2)
0
W 0: Normal operation; 1: Activate testmode
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
REXT_open
0
R
Checks if external resistor REXT is open
0: REXT correct; 1: REXT is open
D6
REXT_short
0
R
Checks if external resistor REXT is shorted
0: REXT correct; 1: REXT is shorted
D7
0
- 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
HEX
Address
Digit
D7
D6
D5
D4
D3
D2
D1
D0
0x14 DIG0
0x15
0x16
DIG1
DIG2 DP A
B
C
D
E
F
G
0x17 DIG3
Register
Segment
HEX
Address
Digit
D7
D6
D5
D4
D3
D2
D1
D0
0x18 DIG4
0x19
0x1A
DIG5
DIG6 DP A
B
CD
E
FG
0x1B DIG7
Note: If more than 2 shorts occure in the LED array, detection of individual LED fault could become limited to blocs.
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 15). 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 intesity command will only write to the associated individual
intensity register.
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