PixArt Imaging Inc.
ADNS-7530 Integrated Molded Lead-Frame DIP Sensor
Notes on Power-up
Notes on Shutdown
The ADNS-7530 does not perform an internal power up
The ADNS-7530 can be set in Shutdown mode by
self-reset; the POWER_UP_RESET register must be written writing 0xe7 to register 0x3b. The SPI port should not
every time power is applied. The appropriate sequence is be accessed when Shutdown mode is asserted, except
as follows:
the power-up command (writing 0x5a to register 0x3a).
(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. To
deassert Shutdown mode:
i. Apply power to VDD3 and VDDIO in any order, with
the delay of no more than 100ms in between each
supply. Ensure all supplies are stable.
ii. Drive NCS high, then low to reset the SPI port.
iii. Write 0x5a to register 0x3a.
i. Write 0x5a to register 0x3a
ii. Wait for at least one frame.
iii. Clear observation register.
iv. Wait at least one frame.
iv. Wait for at least one frame.
v. Clear observation register.
vi. Wait at least one frame and check observation
register, all bits 0-3 must be set.
v. Check observation register, all bits 0-3 must be set to
1.
vii. Read from registers 0x02, 0x03, 0x04 and 0x05 (or
read these same 4 bytes from burst motion register
0x42) one time regardless of the motion pin state.
vi. Write 0x27 to register 0x3C
vii. Write 0x0a to register 0x22
viii. Write 0x01 to register 0x21
ix. Write 0x32 to register 0x3C
x. Write 0x20 to register 0x23
xi. Write 0x05 to register 0x3C
xii. Write 0xB9 to register 0x37
xiii. Any register settings must then be reloaded.
viii. Write 0x27 to register 0x3C
ix. Write 0x0a to register 0x22
x. Write 0x01 to register 0x21
xi. Write 0x32 to register 0x3C
xii. Write 0x20 to register 0x23
xiii. Write 0x05 to register 0x3C
xiv. Write 0xB9 to register 0x37
Pin
Status when Shutdown Mode
Functional[1]
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.
NCS
MISO
SCLK
MOSI
XYLASER
Undefined[2]
Ignore if NCS = 1 [3]
Ignore if NCS = 1 [4]
High(off)
State of Signal Pins After VDD is Valid
Before Reset
On
LASER_NEN
MOTION
Notes:
High(off)
Undefined [2]
Pin
Power-Up
NCS High
NCS Low After Reset
NCS
MISO
Functional
Undefined
Hi
Low
Functional
1. NCS pin must be held to 1 (high) if SPI bus is shared with other
devices. It is recommended to hold to 1 (high) during Power
Down unless powering up the Sensor. It must be held to 0 (low) if
the sensor is to be re-powered up from shutdown (writing 0x5a to
register 0x3a).
Undefined Functional Depends
on NCS
SCLK
Ignored
Ignored
Functional Depends
on NCS
2. Depend on last state
MOSI
Ignored
Ignored
Functional Depends
on NCS
3. SCLK is ignore if NCS is 1 (high). It is functional if NCS is 0 (low).
4. MOSI is ignore if NCS is 1 (high). If NCS is 0 (low), any command
present on the MOSI pin will be ignored except power-up command
(writing 0x5a to register 0x3a).
MOTION
Undefined
Undefined Undefined Functional
Undefined Undefined Functional
LASER_NEN Undefined
Note:
There are long wakeup times from shutdown and forced Rest. These
features should not be used for power management during normal
mouse motion.
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PixArt Imaging Inc.
E-mail: fae_service@pixart.com.tw
19
PIXART [ PIXART IMAGING INC. ]
