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ADNS-3040 Datasheet(PDF) 14 Page - Agilent(Hewlett-Packard)

Part No. ADNS-3040
Description  Ultra Low-Power Mouse Sensor
Download  26 Pages
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Maker  HP [Agilent(Hewlett-Packard)]
Homepage  http://www.home.agilent.com
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ADNS-3040 Datasheet(HTML) 14 Page - Agilent(Hewlett-Packard)

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14
Notes on Shutdown and Forced Rest
The ADNS-3040 can be set in
Rest mode through the
Configuration_Bits register
(0x11). This is to allow for
further power savings in
applications where the sensor
does not need to operate all
the time.
The ADNS-3040 can be set in
Shutdown mode by asserting
the SHTDWN pin. For proper
operation, SHTDWN pulse
width must be at least t
STDWN.
Shorter pulse widths may
cause the chip to enter an
undefined state. In addition,
the SPI port should not be
accessed when SHTDWN is
asserted. (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 shutdown.
After deasserting SHTDWN, a
full reset must be initiated.
Wait t
WAKEUP before accessing
the SPI port, then write 0x5A
to the POWER_UP_RESET
register. Any register settings
must then be reloaded.
* 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 in addition
to the microcontroller.
Note:
There are long wakeup times from shutdown
and forced Rest. These features should not be
used for power management during normal
mouse motion.
Notes on Power-up
The ADNS-3040 does not
perform an internal power up
self-reset; the
POWER_UP_RESET register
must be written every time
power is applied. The
appropriate sequence is as
follows:
1. Apply power
2. Drive NCS high, then low to
reset the SPI port
3. Write 0x5a to register 0x3a
4. Read from registers 0x02,
0x03 and 0x04 (or read
these same 3 bytes from
burst motion
register 0x42) one time
regardless the state of the
motion pin.
During power-up there will be
a period of time after the
power supply is high but
before any clocks are available.
The table below shows the
state of the various pins
during power-up and reset.
Pin
On Power-Up
NCS high
before reset
NCS Low
before reset
After Reset
NCS
functional
high
low
functional
MISO
undefined
undefined
functional
depends on
NCS
SCLK
ignored
ignored
functional
depends on
NCS
MOSI
ignored
ignored
functional
depends on
NCS
XY_LED
undefined
undefined
undefined
functional
MOTION
undefined
undefined
undefined
functional
SHTDWN
must be low
must be low
must be low
functional
State of Signal Pins After VDD is Valid
Pin
SHTDWN active
NCS
Functional*
MISO
Undefined
SCLK
Undefined
MOSI
Undefined
XY_LED
Low current
MOTION
Undefined


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