ADNS-3090 Datasheet, PDF (16/38 Pages) Pixart Imaging Inc. – High-Performance Optical Mouse Sensor

PixArt Imaging Inc.
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Write Operation
Write operation, defined as data going from the micro-
controller to the ADNS-3090, 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-3090 reads MOSI on rising edges
of SCLK.
Read Operation
A read operation, defined as data going from the
ADNS-3090 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-3090 over MISO. The sensor outputs
MISO bits on falling edges of SCLK and samples MOSI bits
on every rising edge of SCLK.
NOTE:
The 250 ns minimum high state of SCLK is also the minimum
MISO data hold time of the ADNS-3090. Since the falling
edge of SCLK is actually the start of the next read or write
command, the ADNS-3090 will hold the state of data on
MISO until the falling edge of SCLK.
SCLK
MOSI
t_Hold,MOSI
t_{Setup, MOSI}
Figure 15. MOSI setup and hold time
SCLK
tDLY-MISO
MISO
tHOLD-MISO
D0
Figure 18. MISO delay and hold time
NCS
SCLK
MOSI
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1
A₆
A₅
A₄
A₃
A₂
A₁
A₀
D₇
D₆
D₅
D₄
D₃
D₂
D₁
D₀
MISO
12
1
A₆
Figure 16. Write Operation
MOSI Driven by Micro-Controller
NCS
SCLK
Cycle #
SCLK
MOSI
MISO
1
2
3
4
5
6
7
8
0
A₆
A₅
A₄
A₃
A₂
A₁
A₀
9
10
11
12
13
14
15
16
D₇
D₆
D₅
D₄
D₃
D₂
D₁
D₀
Figure 17. Read operation
t_{SRAD delay}
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PixArt Imaging Inc.
E-mail: [e-mail]
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