ADNS-7550 Avago Technologies US Inc., ADNS-7550 Datasheet - Page 15

• Manufacturer Part Number: ADNS-7550
• Description: Optical Mouse Sensor,DIP
• Manufacturer: Avago Technologies US Inc.

Specifications of ADNS-7550

• Mounting Style: Through Hole
• Termination Style: Solder Pin
• Supply Voltage: 5 V
• Operating Temperature Range: 0 C to + 40 C
• Product: Optical
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 516-2180; ADNS-7550

Write Operation
Write operation, defined as data going from the micro-
controller to the ADNS-7550, 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-7550 reads MOSI on rising edges of
SCLK.
Figure 14. Write Operation
Fig ure 15. MOSI Setup and Hold Time
Figure 16. Read Operation
Note:
15
M I S O
N C S
S C L K
M O S I
The 0.5/fSCLK minimums high state of SCLK is also the minimum
MISO data hold time of the ADNS-7550. Since the falling edge of
SCLK is actually the start of the next read or write command, the
ADNS-7550 will hold the state of data on MISO until the falling edge
of SCLK.
1
1
2
A
6
3
A
5
4
A
4
5
A
3
6
A
M O S I D rive n by M icro -C o ntro lle r
2
7
A
1
8
A
0
9
D
Read Operation
A read operation, defined as data going from the
ADNS-7550 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 MOSI, and has a “0” as its MSB to indicate
data direction. The second byte contains the data and is
driven by the ADNS-7550 over MISO. The sensor outputs
MISO bits on falling edges of SCLK and samples MOSI bits
on every rising edge of SCLK.
Figure 17. MISO Delay and Hold Time
7
1 0
D
6
1 1
D
5
1 2
D
4
1 3
D
3
1 4
D
2
1 5
D
1
1 6
D
0
1
1
A
2
6