17

Write Operation

Write operation, defined as data going from the micro-controller to the ADNS-7530, is always initiated by the micro-

controller and consists of two bytes. The first byte contains the address (seven bits) and has a “1” as its MSB to indicate

data direction. The second byte contains the data. The ADNS-7530 reads MOSI on rising edges of SCLK.

A

6

A

5

A

2

A

3

A

4

A

0

A

1

D

7

D

4

D

5

D

6

D

0

D

1

D

2

D

3

15

789

10

11

12

13

14

16

2

3

456

1

SC L K

MO S I

M O S I D riven by M icr o -C o ntro ller

1

1

1

A

6

2

NCS

MIS O

SCLK

MOSI

Figure 15. Write Operation

Figure 16. MOSI Setup and Hold Time

1

2

3

4

5

6

7

8

SCLK

Cycle #

SCLK

MOSI

0

9

10

11

12

13

14

15

16

MISO

NCS

SCLK

MISO

Read Operation

A read operation, defined as data going from the ADNS-7530 to the micro-controller, is always initiated by the micro-

controller and consists of two bytes. The first byte contains the address, is sent by the micro-controller 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-7530 over

MISO. The sensor outputs MISO bits on falling edges of SCLK and samples MOSI bits on every rising edge of SCLK.

Figure 17. Read Operation

Figure 18. MISO Delay and Hold Time

Note:

The 0.5/fSCLK minimums high state of SCLK is also the minimum MISO data hold time of the ADNS-7530. Since the falling edge of SCLK is actually

the start of the next read or write command, the ADNS-7530 will hold the state of data on MISO until the falling edge of SCLK.

PixArt Imaging Inc.

ADNS-7530 Integrated Molded Lead-Frame DIP Sensor

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PixArt Imaging Inc.