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參數(shù)資料
| 型號： | ADNS-2051 |
| 英文描述： | Optical Mouse Sensor |
| 中文描述： | 光學鼠標傳感器 |
| 文件頁數(shù)： | 17/40頁 |
| 文件大?。?/td> | 454K |
| 代理商： | ADNS-2051 |
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17
Synchronous Serial Port
The synchronous serial port is
used to set and read parameters
in the ADNS-2051, and can be
used to read out the motion infor-
mation instead of the quadrature
data pins.
The port is a two wire, half duplex
port. The host micro-controller
always initiates communication;
the ADNS-2051 never initiates
data transfers.
SCLK:
The serial port clock. It
is always generated by
the master (the micro-
controller).
SDIO:
The data line.
PD:
A third line is sometimes
involved. PD (Power
Down) is usually used to
place the ADNS-2051 in
a low power mode to
meet USB suspend speci-
fication. PD can also be
used to force re-synchro-
nization between the
micro-controller and the
ADNS-2051 in case of an
error.
Write Operation
Write operations, where data is
going from the micro-controller
to the ADNS-2051, is always initi-
ated 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 sec-
ond byte contains the data. The
transfer is synchronized by SCLK.
The micro-controller changes
SDIO on falling edges of SCLK.
The ADNS-2051 reads SDIO on
rising edges of SCLK.
Figure 25. Write operation.
Figure 26. SDIO setup and hold times
SCLK pulse width.
1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
D0
D5
D6
D7
A0
A1
A2
A3
A4
A5
A6
D4
D3
D2
D1
SCLK
CYCLE #
SCLK
SDIO
DON'T
CARE
SDIO DRIVEN BY MICRO-CONTROLLER
120 ns
120 ns
120 ns, MIN.
tsetup = 60 ns, MIN.
SCLK
SDIO
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