www.austriamicrosystems.com/LED-Driver-ICs/AS1119

Revision 1.04

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AS1119

Datasheet - Detailed Descr i pti on

Figure 18. Command and Single Data Byte received by AS1119

Figure 19. Setting the Pointer to a Address Register to select a Data Register for a Read Operation

Figure 20. Reading n Bytes from AS1119

Initial Power-Up

On initial power-up, the AS1119 registers are reset to their default values, the display is blanked, and the device goes into shutdown mode. At

this time, all registers should be programmed for normal operation.

Note:

The default settings enable only scanning of one digit; the internal decoder is disabled and the Intensity Control Register (see page

16

) and (see page 20) is set to the minimum values.

Shutdown Mode

The AS1119 device features two different shutdown modes. A software shutdown via shutdown register (see Shutdown Register (0x0A)

on page 26)

and a hardware shutdown via the RSTN pin.

The software shutdown disables all LED’s and stops the internal operation of the logic. A shutdown mode via the RSTN pin additionally powers

down the power-on-reset (PO) of the device. In this shutdown mode the AS1119 consumes only 100nA (typ.).

From Master to Slave

From Slave to Master

AA

P

A

S

Command Byte

Data Byte

Slave Address

A6

A5

A4

A3

A2

A1

A0

A7

D6

D5

D4

D3

D2

D1

D0

D7

Acknowledge

from AS1119

0

0

0

Acknowledge

from AS1119

Acknowledge

from AS1119

R/W

0

AS1119 Registers

Autoincrement

Memory Word

Address

1 Byte

From Master to Slave

From Slave to Master

AP

A

S

Command Byte

Slave Address

A6

A5

A4

A3

A2

A1

A0

A7

0

0

Acknowledge

from AS1119

Acknowledge

from AS1119

R/W

0

AS1119 Registers

From Master to Slave

From Slave to Master

A/A

P

A

S

First Data Byte

Second Data Byte

Slave Address

D6

D5

D4

D3

D2

D1

D0

D7

D6

D5

D4

D3

D2

D1

D0

D7

Not Acknowledge

from Master

0

1

0

Acknowledge

from Master

Acknowledge

from AS1119

R/W

1

AS1119 Registers

Autoincrement

Memory Word

Address

n Bytes

Autoincrement

to next address

Stop reading