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參數(shù)資料
| 型號： | ADNS-2051 |
| 英文描述： | Optical Mouse Sensor |
| 中文描述： | 光學(xué)鼠標傳感器 |
| 文件頁數(shù)： | 21/40頁 |
| 文件大?。?/td> | 454K |
| 代理商： | ADNS-2051 |
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21
Error Detection and Recovery
1. The ADNS-2051 and the
micro-controller might get
out of synchronization due to
ESD events, power supply
droops or micro-controller
firmware flaws. In such a
case, the micro-controller
should raise PD for 100
μ
s.
The ADNS-2051 will reset the
serial port but will not reset
the registers and be prepared
for the beginning of a new
transmission.
2. The ADNS-2051 has a transac-
tion timer for the serial port.
If the sixteenth SCLK rising
edge is spaced more than
approximately 0.9 seconds
from the first SCLK edge of the
current transaction, the serial
port will reset.
3. Invalid addresses:
– Writing to an invalid
address will have no effect.
Reading from an invalid
address will return all zeros.
4. Collision detection on SDIO
– The only time that the
ADNS-2051 drives the SDIO
line is during a READ
operation. To avoid data
collisions, the micro-
controller should relinquish
SDIO before the falling edge
of SCLK after the last
address bit. The
ADNS-2051 begins to drive
SDIO after the next rising
edge of SCLK. The
ADNS-2051 relinquishes
SDIO within 120 ns of the
falling SCLK edge after the
last data bit. The micro-
controller can begin driving
SDIO any time after that. In
order to maintain low power
consumption in normal
operation or when the PD
pin is pulled high, the
micro-controller should not
leave SDIO floating until the
next transmission (although
that will not cause any
communication difficulties).
5. In case of synchronization
failure, both the ADNS-2051
and the micro-controller may
drive SDIO. The ADNS-2051
can withstand 30 mA of short
circuit current and will with-
stand infinite duration short
circuit conditions.
6. Termination of a transmission
by the micro-controller may
sometimes be required (for
example, due to a USB sus-
pend interrupt during a read
operation). To accomplish this
the micro-controller should
raise PD. The ADNS-2051 will
not write to any register and
will reset the serial port (but
nothing else) and be prepared
for the beginning of future
transmissions after PD goes
low.
7. The micro-controller can verify
success of write operations by
issuing a read command to the
same address and comparing
written data to read data.
8. The micro-controller can verify
the synchronization of the
serial port by periodically
reading the product ID
register.
Notes on Power up and the Serial
Port
The sequence in which V
DD
, PD,
SCLK, and SDIO are set during
powerup can affect the operation
of the serial port. The diagram
below shows what can happen
shortly after powerup when the
microprocessor tries to read data
from the serial port.
This diagram shows the V
DD
ris-
ing to valid levels, at some point
the microcontroller starts its pro-
gram, sets the SCLK and SDIO
lines to be outputs, and sets them
high. It then waits to ensure that
the ADNS-2051 has powered up
and is ready to communicate. The
microprocessor then tries to read
from location 0x00, Product_ID,
Figure 35. Power up serial port watchdog timer sequence.
DATA = 0x02
SCLK
SDIO
ADDRESS = 0x00
PD
V
DD
PROBLEM AREA
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| ADNS-2080 | 功能描述:光學(xué)導(dǎo)航傳感器 LED Sensor RoHS:否 制造商:Avago Technologies 工作電源電壓: 封裝 / 箱體: 最大工作溫度: 最小工作溫度: |
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| ADNS-2120-001 | 功能描述:光學(xué)導(dǎo)航傳感器 Trim Mouse Lens RoHS:否 制造商:Avago Technologies 工作電源電壓: 封裝 / 箱體: 最大工作溫度: 最小工作溫度: |
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| ADNS-2220-001 | 功能描述:光學(xué)導(dǎo)航傳感器 Clear Optical Mouse Clip RoHS:否 制造商:Avago Technologies 工作電源電壓: 封裝 / 箱體: 最大工作溫度: 最小工作溫度: |
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