Data Sheet

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AS1115

Datasheet - D e t a iled D e s c r iptio n

The Shutdown Register controls AS1115 shutdown mode.

Decode Enable Register (0x09)

The Decode Enable Register sets the decode mode. BCD/HEX decoding (either BCD code – characters 0:9, E, H, L, P, and -, or HEX code –

aracters 0:9 and A:F) is selected by bit D2 (page 18) of the Feature Register. The Decode Enable Register is used to select the decode mode

or no-decode for each digit. Each bit in the Decode Enable Register corresponds to its respective display digit (i.e., bit D0 corresponds to digit 0,

bit D1 corresponds to digit 1 and so on). Table 9 lists some examples of the possible settings for the Decode Enable Register bits.

Note: A logic high enables decoding and a logic low bypasses the decoder altogether.

When decode mode is used, the decoder looks only at the lower-nibble (bits D3:D0) of the data in the Digit-Registers, disregarding bits D6:D4.

Bit D7 sets the decimal point (SEG DP) independent of the decoder and is positive logic (bit D7 = 1 turns the decimal point on). Table 9 lists the

code-B font; Table 10 lists the HEX font.

When no-decode mode is selected, data bits D7:D0 of the Digit-Registers correspond to the segment lines of the AS1115. Table 11 shows the

1:1 pairing of each data bit to the appropriate segment line.

Keyscan/Diagnostic Register

Diagnostic Digit 0 000 1 0 1 0 0 N/A

Diagnostic Digit 1 000 1 0 1 0 1 N/A

Diagnostic Digit 2 000 1 0 1 1 0 N/A

Diagnostic Digit 3 000 1 0 1 1 1 N/A

Diagnostic Digit 4 000 1 1 0 0 0 N/A

Diagnostic Digit 5 000 1 1 0 0 1 N/A

Diagnostic Digit 6 000 1 1 0 1 0 N/A

Diagnostic Digit 7 000 1 1 0 1 1 N/A

KEYA 000 1 1 1 0 0

KEYB 000 1 1 1 0 1

Table 7. Shutdown Register Format (Address (HEX) = 0x0C))

Mode HEX Code

D7 D6 D5 D4 D3 D2 D1 D0

Shutdown Mode,

Reset Feature Register to Default Settings

0x00 0 X X X X X X 0

Shutdown Mode, Feature Register Unchanged 0x80 1 X X X X X X 0

Normal Operation,

Reset Feature Register to Default Settings

0x01 0 X X X X X X 1

Normal Operation, Feature Register Unchanged 0x81 1 X X X X X X 1

Table 8. Decode Enable Register Format Examples

Decode Mode HEX Code

D7 D6 D5 D4 D3 D2 D1 D0

No decode for digits 7:0 0x00 0 0 0 0 0 0 0 0

Code-B/HEX decode for digit 0. No decode for digits 7:1 0x01 0 0 0 0 0 0 0 1

Code-B/HEX decode for digit 0:2. No decode for digits 7:3 0x07 0 0 0 0 0 1 1 1

Code-B/HEX decode for digits 0:5. No decode for digits 7:6 0x3F 0 0 1 1 1 1 1 1

Code-B/HEX decode for digits 0,2,5.

decode for digits 1, 3, 4, 6, 7

0x25 0 0 1 0 0 1 0 1

Table 6. Register Address Map

Type

Address

Page

D15:D13 D12 D11 D10 D9 D8 D7:D0

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