28

LSRPWR_CFG0

Address: 0x1c

Access: Read/Write

Reset Value: 0x00

Data Type: 8 Bit unsigned

USAGE: This register is used to set the laser current. It is to be used together with register 0x1D, where register 0x1D

contains the complement of register 0x1C. If the registers do not contain complementary values, the laser is turned

off and the LP_VALID bit in the MOTION register is set to 0. The registers may be written in any order after the power

ON reset.

Bit

7

6

5

4

3

2

1

0

Field

Field Name

Description

LP7 – LP0

Controls the 8-bit DAC for adjusting laser current.

One step is equivalent to (1/384)*100% = 0.26% drop of relative laser current.

Refer to the table below for examples of relative laser current settings.

LP7 - LP3

LP 2

LP 1

LP 0

Relative Laser Current

00000

0

0

0

33.59%

00000

0

0

1

33.85%

00000

0

1

0

34.11%

: :

:

:

:

: :

11111

1

0

1

99.48%

11111

1

1

0

99.74%

11111

1

1

1

100%

LSRPWR_CFG1

Address: 0x1d

Access: Read/Write

Reset Value: 0x00

Data Type: 8 Bit unsigned

USAGE: The value in this register must be a complement of register 0x1C for laser current to be as programmed,

otherwise the laser is turned off and the LP_VALID bit in the MOTION register is set to 0. Registers 0x1C and 0x1D may

be written in any order after power ON reset.

Bit

7

6

5

4

3

2

1

0

Field

Reserved

Address: 0x1e

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PixArt Imaging Inc.

PixArt Imaging Inc.

ADNS-7550 Integrated Molded Lead-Frame DIP Sensor