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AS1106, AS1107

Datasheet - Detailed Descr i pti on

8.5.1 Shutdown Register (0xXC)

The Shutdown Register controls AS1106/AS1107 shutdown mode (see Shutdown Mode on page 9).

8.5.2 Decode Enable Register (0xX9)

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 –

characters 0:9 and A:F) is selected by bit D2 (page 13) 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 10 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 10 lists the

code-B font; Table 11 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 AS1106/AS1107. Table 12

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

Figure 13. Standard 7-Segment LED Intensity Control and Inter-Digit Blanking

Table 8. Shutdown Register Format (Address (HEX) = 0xXC))

Mode

HEX Code

Register Data

D7

D6

D5

D4

D3

D2

D1

D0

Shutdown Mode,

Reset Feature Register to Default Settings

0x00

0

XXXXXX

0

Shutdown Mode, Feature Register Unchanged

0x80

1

XXXXXX

0

Normal Operation,

Reset Feature Register to Default Settings

0x01

0

XXXXXX

1

Normal Operation, Feature Register Unchanged

0x81

1

XXXXXX

1

Table 9. Decode Enable Register Format (Address (HEX) = 0xX9))

Decode Mode

HEX Code

Register Data

D7

D6

D5

D4

D3

D2

D1

D0

No decode for digits 7:0

0x00

000

0000

0

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

0x01

0

0

0

0000

1

Code-B/HEX decode for digits 3:0. No decode for digits 7:4

0x0F

000

0111

1

Code-B/HEX decode for digits 7:0

0xFF

111

1111

1

Table 10. Code-B Font

7-Segment Character

Register Data

On Segments = 1

D7

†

D6:D4

D3

D2

D1

D0

DP

†

A

B

C

D

E

F

G

0

X

0000

11111

10

1

X

0001

01100

00

2

X

0010

11011

01

3

X

0011

11110

01

4

X

0100

01100

11

A

B

G

F

E

D

C

DP