ADNS-2030 Просмотр технического описания (PDF) - Avago Technologies

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ADNS-2030

Low Power Optical Mouse Sensor

Avago Technologies 

The maximum value of the shutter is depen-

dent upon the frame rate and clock frequen-

cy. The formula for the maximum shutter value is:

For a clock frequency of 18 MHz, the following table

shows the maximum shutter value. 1 clock cycle is 55.56

nsec.

Max shutter value = clock freq – 2816

frame rate

Frames/second

Max Shutter

Decimal

Hex

Shutter

Upper

Lower

2300*

5010

0x1392

13

92

2000*

6184

0x1828

18

28

1500

9184

0x23E0

23

E0

1000

15184

0x3B50

3B

50

500

33184

0x81A0

81

A0

* Note: To optimize tracking performance on dark surfaces, it is recommended that an adaptive frame rate based on

shutter value be implemented for frame rates greater than 1500.

<-- Default Max Shutter

Frame_Period_Lower

Access: Read/Write

Address: 0x10

Reset Value: 0x20

Bit

7

6

5

4

3

2

1

0

Field

FP7

FP6

FP5

FP4

FP3

FP2

FP1

FP0

Frame_Period_Upper

Access: Read/Write

Address: 0x11

Reset Value: 0xd1

Bit

7

6

5

4

3

2

1

0

Field

FP15

FP14

FP13

FP12

FP11

FP10

FP9

FP8

Data Type: Sixteen bit 2’s complement word.

USAGE: Sets the frame rate. The frame period counter counts up until it overflows. Units are clock cycles.

The formula is: = clock freq = counts

frame rate

(2’s complements hex)

For an 18 MHz clock, below are the Frame_period val-

ues for popular frame rates.

32

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