ADNS-3050 Avago Technologies US Inc., ADNS-3050 Datasheet - Page 13

• Manufacturer Part Number: ADNS-3050
• Description: Optical Sensors - Board Mount Optical Nav Sensor
• Manufacturer: Avago Technologies US Inc.

Specifications of ADNS-3050

• Lead Free Status / Rohs Status: Details

13
Motion Polling
The micro-controller will poll the sensor for valid motion
data by checking on the MOTION_ST bit of MOTION_ST
register in a periodic cycle. If MOTION_ST bit is set, mo-
tion data in DELTA_X and DELTA_Y registers are valid and
ready to be read out by the micro-controller.
Motion polling sequence:
1. Read MOTION_ST bit of MOTION_ST register. If
2. Read DELTA_X and DELTA_Y registers consecutively
3. Optional: Read PROD_ID register to check for
Motion polling is recommended to be used in the corded
application like USB gaming mouse that requires fast mo-
tion response. This feature is not supported in wireless
mode.
MOTION Interrupt
MOTION output signal (pin 3) can be used as interrupt
input to the micro-controller of the mouse triggering the
read command of motion data from the sensor whenever
there is motion detected by the sensor. The MOTION signal
is active low level-triggered output. The MOTION pin level
will be driven low as long the MOTION_ST bit in register
0x02 is set and motion data in DELTA_X and DELTA_Y reg-
isters ready to be read out by the micro-controller. Once
all the motion data has been read, DELTA_X and DELTA_Y
values become zero, MOTION bit is reset and the MOTION
pin level is driven high again.
MOTION Interrupt sequence:
1. When MOTION pin = Low, Read DELTA_X and DELTA_Y
2. Optional: Read PROD_ID register to check for
MOTION interrupt should be implemented in wireless
application to lengthen battery life. It is very useful as
the main control of power management to wake up mi-
cro-controller and radio in the wireless system from rest
modes.
Mode
Wired
Wireless
MOTION_ST bit = 1, go to step 2.
communication link or sensor functionality. This
Product ID verifi cation MUST be done only after
reading MOTION_ST, DELTA_X and DELTA_Y registers.
registers consecutively.
communication link or sensor functionality. This
Product ID verifi cation MUST be done only after
reading MOTION_ST, DELTA_X and DELTA_Y registers.
Motion Detection Routine
Motion Polling
Yes
Not Supported
MOTION Interrupt
Yes
Yes
Power Up Reset
Although ADNS-3050 does have an internal power up self
reset circuitry, it is still highly recommended to follow the
power up sequence below every time power is applied.
i. Apply power
ii. Drive NCS high, then low to reset the SPI port
iii. Write 0x5a to register 0x3a
iv. Wait for at least tSWW (or tWAKEUP when performing
v. Write 0x20 to register 0x0d
vi. Write 0x00 to register 0x41
vii. Confi gure the desired sensor settings accordingly
Reset
ADNS-3050 can be reset by following power up reset se-
quence. A full reset will thus be executed and any regis-
ter settings must be reloaded. The table below shows the
state of the various pins during reset.
State of Signal Pins after VDD is Valid
Power Down
The ADNS-3050 can be set to power down mode by writ-
ing 0x02 to register 0x0d to disable the sensor. The SPI port
should not be accessed during power down. Other ICs on
the same SPI bus can be accessed, as long as the sensor‘s
NCS pin is not asserted. The table below shows the state
of various pins during power down. To exit Power Down,
reset the sensor in order to wake it up. A full reset will thus
be executed. Wait tWAKEUP before accessing the SPI port.
Any register settings must then be reloaded.
*Notes:
•
•
Pin
NCS
MISO
SCLK
MOSI
LED
Pin
MOTION
NCS
MOSI
SCLK
MISO
reset to wake up from Power Down)
NCS pin must be held to 1(HIGH) if SPI Bus is shared with other
devices, it can be in either state if the sensor is the only device to
connect to the host micro controller
Reading on register should only be performed after existing from the
power down mode. Any read operation during power down will not
refl ect the actual data of the register.
During Reset
Ignored
Low
Ignored
Ignored
High
During Power Down
Undefi ned
Functional*
Functional*
Functional*
Undefi ned*
After Reset
Functional
Depends on NCS
Depends on NCS
Depends on NCS
Functional