ADNS-2051 Avago Technologies US Inc., ADNS-2051 Datasheet - Page 18

• Manufacturer Part Number: ADNS-2051
• Description: Optical Mouse Sensor,DIP
• Manufacturer: Avago Technologies US Inc.

Specifications of ADNS-2051

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q2072083C

SCLK
CYCLE #
SCLK
SDIO
18
Synchronous Serial Port
The synchronous serial port is used to set and read param-
eters in the ADNS-2051, 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 micro-
controller always initiates communication; the ADNS-2051
never initiates data transfers.
SCLK:
SDIO:
PD:
Figure 25. Write operation
SCLK
SDIO
Figure 26. SDIO setup and hold times SCLK pulse
width
120 ns 120 ns
The serial port clock. It is always generated by
the master (the micro-controller).
The data line.
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
specification. PD can also be used to force re-
synchronization between the micro-controller
and the ADNS-2051 in case of an error.
1
1
t setup = 60 ns, MIN.
A 6
2
120 ns, MIN.
3
A 5
A 4
4
A 3
5
6
A 2
SDIO DRIVEN BY MICRO-CONTROLLER
A 1
7
8
A 0
Write Operation
Write operations, where data is going from the micro-
controller to the ADNS-2051, 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 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.
D 7
9
10
D 6
11
D 5
12
D 4
13
D 3
14
D 2
15
D 1
16
D 0
DON'T
CARE