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ADNS-5020-EN Datasheet(PDF) 11 Page - AVAGO TECHNOLOGIES LIMITED

Part No. ADNS-5020-EN
Description  Optical Mouse Sensor
Download  24 Pages
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Maker  AVAGO [AVAGO TECHNOLOGIES LIMITED]
Homepage  http://www.avagotech.com
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ADNS-5020-EN Datasheet(HTML) 11 Page - AVAGO TECHNOLOGIES LIMITED

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11
LED Mode
For power savings, the LED will not be continuously on.
ADNS-5020-EN will pulse the LED only when needed.
Synchronous Serial Port
The synchronous serial port is used to set and read
parameters in the ADNS-5020-EN, and to read out the
motion information.
The port is a three wire serial port. The host micro-con-
troller always initiates communication; the ADNS-5020-EN
never initiates data transfers. SCLK, SDIO, and NCS may be
driven directly by a micro-controller. The port pins may be
shared with other SPI slave devices. When the NCS pin is
high, the inputs are ignored and the output is tri-stated.
The lines that comprise the SPI port:
SCLK:
Clock input. It is always generated by the master
(the micro-controller).
SDIO:
Input and Output data.
NCS:
Chip select input (active low). NCS needs to be
low to activate the serial port; otherwise, SDIO
will be high Z, and SDIO & SCLK will be ignored.
NCS can also be used to reset the serial port in
case of an error.
Write Operation
SDIO Setup and Hold Time
Chip Select Operation
The serial port is activated after NCS goes low. If NCS
is raised during a transaction, the entire transaction
is aborted and the serial port will be reset. This is true
for all transactions. After a transaction is aborted, the
normal address-to-data or transaction-to-transaction
delay is still required before beginning the next trans-
action. To improve communication reliability, all serial
transactions should be framed by NCS. In other words,
the port should not remain enabled during periods of
non-use because ESD and EFT/B events could be inter-
preted as serial communication and put the chip into an
unknown state. In addition, NCS must be raised after
each burst-mode transaction is complete to terminate
burst-mode. The port is not available for further use until
burst-mode is terminated.
Write Operation
Write operation, defined as data going from the micro-
controller to the ADNS-5020-EN, 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 ADNS-5020-EN reads SDIO on rising edges
of SCLK.
1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
2
1
D0
D5
D6
D7
A0
A1
A2
A3
A4
A5
A6
1
A6
D4
D3
D2
D1
SCLK
NCS
SDIO
SDIO DRIVEN BY MICRO-CONTROLLER
tsetup
1/f SCLK 1/f SCLK
thold
SCLK
SDIO


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