12

Figure 11. Write operation

Figure 12. MOSI setup and hold time

Read Operation

A read operation, defined as data going from the ADNS-

3530 to the microcontroller, is always initiated by the

microcontroller and consists of two bytes. The first byte

contains the address, is sent by the microcontroller over

MOSI, and has a “0” as its MSB to indicate data direction.

The second byte contains the data and is driven by the

ADNS-3530 over MISO. The sensor outputs MISO bits on

falling edges of SCLK and samples MOSI bits on every

rising edge of SCLK.

Figure 13. Read operation

Figure 14. MISO delay and hold time

1

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

2

1

D0

D5

D6

D7

A0

A1

A2

A3

A4

A5

A6

1A6

D4

D3

D2

D1

SCLK

NCS

MOSI

MOSI DRIVEN BY MICRO-CONTROLLER

MISO

SCLK

MOSI

1

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

A0

A1

A2

A3

A4

A5

A6

SCLK

NCS

SCLK

CYCLE #

MOSI

D0

D5

D6

D7

tSRAD DELAY

D4

D3

D2

D1

MISO

D0

tHOLD-MISO

tDLY-MISO

SCLK

MISO

PixArt Imaging Inc.

Low Power LED Integrated Slim Mouse Sensor

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PixArt Imaging Inc.