ADNS-9500 Avago Technologies US Inc., ADNS-9500 Datasheet - Page 16

• Manufacturer Part Number: ADNS-9500
• Description: Ultimate Gaming Laser Sensor
• Manufacturer: Avago Technologies US Inc.

Specifications of ADNS-9500

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

t
SCLK
NCS
SCLK
Cycle #
SCLK
MOSI
MISO
SCLK
Read Operation
A read operation, defined as data going from the ADNS-9500 Sensor 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-9500
Sensor over MISO. The sensor outputs MISO bits on falling edges of SCLK and samples MOSI bits on every rising edge of
SCLK.
Figure 15. Read Operation
Figure 16. MISO Delay and Hold Time
Required timing between Read and Write Commands (tsxx)
There are minimum timing requirements between read and write commands on the serial port.
Figure 17. Timing between two write commands
If the rising edge of the SCLK for the last data bit of the second write command occurs before the tsww delay, then the
first write command may not complete correctly.
Figure 18. Timing between write and read commands
If the rising edge of SCLK for the last address bit of the read command occurs before the tswr required delay, the write
command may not complete correctly.
16
DLY-MISO
MISO
SCLK
1
0
Address
Address
2
A
6
D
Write Operation
Write Operation
0
t
3
A
HOLD-MISO
5
4
A
4
5
A
3
Data
Data
6
A
2
A
7
1
A
0
8
9
D
7
t
SRAD delay
Address
10
D
6
NOTE:
The minimum high state of SCLK is also the minimum MISO data hold
time of the ADNS-9500 Sensor. Since the falling edge of SCLK is actually
the start of the next read or write command, the ADNS-9500 Sensor will
hold the state of data on MISO until the falling edge of SCLK.
t
t
SWR
SWW
11
Write Operation
D
5
12
D
4
13
D
3
Address
Next Read
Operation
Data
14
D
2
15
D
1
16
D
0