ADNS-5020 Avago Technologies US Inc., ADNS-5020 Datasheet - Page 12

• Manufacturer Part Number: ADNS-5020
• Description: Optoelectronic Miscellaneous, Other
• Manufacturer: Avago Technologies US Inc.

Specifications of ADNS-5020

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Read Operation
A read operation, defined as data going from the ADNS-5020 to the micro-
controller, is always initiated by the micro-controller and consists of two
bytes. The first byte contains the address, is sent by the micro-controller over
SDIO, and has a “0” as its MSB to indicate data direction. The second byte
contains the data and is driven by the ADNS-5020 over SDIO. The sensor
outputs SDIO bits on falling edges of SCLK and samples SDIO bits on every
rising edge of SCLK.
SCLK
CYCLE #
SCLK
SDIO
DETAIL "A"
MICROCONTROLLER
TO ADNS-5020
SDIO HANDOFF
NOTE: The 0.5/f
data hold time of the ADNS-5020. Since the falling edge of SCLK is actually
the start of the next read or write command, the ADNS-5020 will hold the
state of data on SDIO until the falling edge of SCLK.
12
1
0
SCLK
SCLK
SDIO
minimum high state of SCLK is also the minimum SDIO
A 6
2
DETAIL "B"
ADNS-5020 TO
MICROCONTROLLER
SDIO HANDOFF
SDIO DRIVEN BY MICRO-CONTROLLER
A 1
3
A 5
t
SETUP
4
A 4
5
A 3
SCLK
SDIO
6
A 2
Microcontroller to ADNS-5020 Handoff
ADNS-5020 to Microcontroller Handoff
t
DLY
7
A 1
A 0
RELEASED BY 5020
Read Operation
D
A 0
t
0
t
HOLD
SRAD
8
DETAIL "A"
t
HOLD
0 ns, MIN.
9
D 7
R/W BIT OF NEXT ADDRESS
DRIVEN BY MICRO
10
D 6
Hi-Z
11
D 5
SDIO DRIVEN BY ADNS-5020
12
D 4
t
0 ns, MIN.
D 7
DLY
13
D 3
14
D 2
D 6
t
DLY
15
D 1
16
D 0
DETAIL "B"