ADNS-2051 Ver la hoja de datos (PDF) - Avago Technologies

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ADNS-2051

Optical Mouse Sensor

Avago Technologies 

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: 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

specification. PD can also be used to force re-

synchronization 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 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.

SCLK

CYCLE #

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

SCLK

SDIO

1

A6

A5

A4

A3

A2

A1

A0

D7

D6

D5

D4

D3

D2

D1

D0

DON'T

CARE

SDIO DRIVEN BY MICRO-CONTROLLER

Figure 25. Write operation

120 ns 120 ns

SCLK

SDIO

120 ns, MIN.

tsetup = 60 ns, MIN.

Figure 26. SDIO setup and hold times SCLK pulse

width

ADNS-2051 fig 26

ADNS-2051 fig 25

18

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