ADNS-2610 View Datasheet(PDF) - Agilent Technologies, Inc
Part Name
Description
MFG CO.
'ADNS-2610' PDF : 27 Pages View PDF
Read Operation
A read operation, meaning data
that is going from the ADNS-2610
to the microcontroller, is always
initiated by the microcontroller
and consists of two bytes. The
first byte that contains the
address is written by the
microcontroller and has a “0” as
its MSB to indicate data direc-
tion. The second byte contains
the data and is driven by the
ADNS-2610. The transfer is
synchronized by SCK. SDIO is
changed on falling edges of SCK
and read on every rising edge of
SCK. The microcontroller must
go to a High-Z state after the last
address data bit. The ADNS-2610
will go to the High-Z state after
the last data bit. Another thing to
note during a read operation;
SCK needs to be delayed after the
last address data bit to ensure
that the ADNS-2610 has at least
100 µs to prepare the requested
data. This is shown in the timing
diagrams below (See Figures 21
to 23).
SCK
Cycle #
SCK
SDIO
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
0
A6
A5
A4
A3
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
Figure 21. Read operation.
SDIO Driven by Microcontroller
Detail "A"
SDIO Driven by ADNS-2610
Detail "B"
Detail "A"
SCK
Microcontroller
to ADNS-2610
SDIO handoff
SDIO
A1
t HOLD
100 µs, min
60 ns, min
0 ns, min
A0
250 ns, min
Figure 22. Microcontroller to ADNS-2610 SDIO handoff.
250 ns, max
Hi-Z
D7
250 ns, max
D6
160 ns, min
Detail "B"
SCK
ADNS-2610 to
Microcontroller
SDIO handoff
SDIO
D0
250 ns, min
160 ns, max
R/W bit of next address
Released by ADNS-2610
Driven by microcontroller
Figure 23. ADNS-2610 to microcontroller SDIO handoff.
NOTE:
The 250 ns high state of SCK is the minimum
data hold time of the ADNS-2610. Since the
falling edge of SCK is actually the start of the
next read or write command, the ADNS-2610 will
hold the state of D0 on the SDIO line until the
falling edge of SCK. In both write and read
operations, SCK is driven by the microcontroller.
13
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