HDNS-2200 View Datasheet(PDF) - Agilent Technologies, Inc
Part Name
Description
MFG CO.
'HDNS-2200' PDF : 36 Pages View PDF
Synchronous Serial Port
The synchronous serial port is
used to set and read parameters
in the ADNS-2030, and can be
used to read out the motion
information instead of the
quadrature data pins.
The port is a two wire, half
duplex port. The host
microcontroller always initiates
communication; the ADNS-2030
never initiates data transfers.
SCLK: The serial port clock. It is
always generated by the master
(the microcontroller).
SDIO: The data line.
PD: A third line is sometimes
involved. PD (Power Down) is
usually used to place the
ADNS-2030 in a low power mode.
PD can also be used to force
re-synchronization between the
microcontroller and the
ADNS-2030 in case of an error.
Write Operation
A write operation, which means
that data is going from the
microcontroller to the
ADNS-2030, is always initiated
by the microcontroller 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 transfer is synchronized by
SCLK. The microcontroller
changes SDIO on falling edges of
SCLK. The ADNS-2030 reads
SDIO on rising edges of SCLK.
SCLK
Cycle #
SCLK
SDIO
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
DON'T
CARE
Figure 24 . Write operation.
SDIO Driven by Microcontroller
120 ns 120 ns
SCLK
SDIO
120 ns, min
tsetup = 60 ns, min
Figure 25. SDIO setup and hold times
SCLK pulse width.
16
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