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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.

LED Diagnostic Registers

These eight registers contain the result of the LED open/short test for the individual LED of each digit.

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 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 intesity command will only write to the associated individual

intensity register.

Table 14.

Testmode Register Summary

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

DISP_test

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.)

LED_short

Starts a test for shorted LEDs. (Can be set together with D2)

0: Normal operation; 1: Activate testmode

LED_open

Starts a test for open LEDs. (Can be set together with D1)

0: Normal operation; 1: Activate testmode

LED_test

Indicates an ongoing open/short LED test

0: No ongoing LED test; 1: LED test in progress

LED_global

Indicates that the last open/short LED test has detected an error

0: No error detected; 1: Error detected

RSET_open

Checks if external resistor RSET is open

0: RSET correct; 1: RSET is open

RSET_short

Checks if external resistor RSET is shorted

0: RSET correct; 1: RSET is shorted

Not used

Table 16. LED Diagnostic Register Address

HEX

Address

Segment

HEX

Address

Segment

Digit

D6 D5 D4 D3 D2 D1 D0

0x14

DIG0

0x18

DIG4

0x15

DIG1

0x19

DIG5

0x16

DIG2

0x1A

DIG6

0x17

DIG3

0x1B

DIG7

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