PixArt Imaging Inc.
ADNS-7530 Integrated Molded Lead-Frame DIP Sensor
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.
N C S
2
1
3
4
5
6
7
8
9
1 2
1 5
1 6
1
2
1 0
1 1
1 3
1 4
S C L K
M O S I
A
A
A
A
A
A
A
D
D
D
D
D
D
D
D
A
1
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
1
6
M IS O
M O S I D riven by M icr o -C o ntro ller
Figure 15. Write Operation
SCLK
MOSI
tHold,MOSI
tsetup , MOSI
Figure 16. MOSI Setup and Hold Time
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.
NCS
SCLK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Cycle #
SCLK
MOSI
0
A 6
A 5
A 4
A 3
A 2
A 1
A 0
D 0
MISO
D 7
D 6
D 5
D 4
D 3
D 2
D 1
tSRAD delay
Figure 17. Read Operation
SCLK
tHOLD-MISO
tDLY-MISO
D0
MISO
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.
All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission.
PixArt Imaging Inc.
E-mail: fae_service@pixart.com.tw
17
PIXART [ PIXART IMAGING INC. ]
