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參數(shù)資料
| 型號： | MTA41110/P |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PDIP18 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-18 |
| 文件頁數(shù)： | 21/24頁 |
| 文件大?。?/td> | 377K |
| 代理商： | MTA41110/P |
MTA41110
DS40103C-page 6
1995 Microchip Technology Inc.
3.0
MOTION ENCODER
INTERFACE
The MTA41110 is designed to interface to both optical
encoders that utilize LED and photo transistor pairs
with a chopper wheel or mechanical encoders that
utilize a commutator with wiper contacts.
Power consumption is reduced by strobing the motion
encoder power each time the encoders are sampled.
The MTA41110 will drive the QDRV output high 8
S
(with 4 MHz input clock) prior to sampling the HOR and
VERT inputs to give the encoders time to stabilize. The
QDRV output will be driven back low 2
s after the
sample is taken.
If power consumption
is not a
concern,
then
the
QDRV
output
can
be
left
unconnected and encoders can be powered directly
from a constant supply (e.g., +5V power).
An anti-jitter algorithm is employed to eliminate false
motion counting when the mouse or trackball is not
moving. This is especially useful in designs employing
optical encoders since the output of an optical detector
is an analog signal. The anti-jitter algorithm eliminates
false counting when a voltage that is not a well defined
logic low or logic high is applied to either the HOR or
VERT inputs.
The HOR and VERT inputs detect positive and nega-
tive delta motion.
Motion direction is defined in the
following state table
along
with
Figure 3-1 and
The HOR and VERT inputs are sampled at ~8700
samples per second with a 4 MHz input clock. The
sample rate will decrease slightly when communication
traffic to or from the host is occurring. The sample rate
is directly proportional to the clock frequency on the
OSC1 and OSC2 pins.
Positive Motion:
Hor1,Hor2 /
Vert1,Vert2
Description
0,0
0,1
1,1
Positive Direction Sequence
1,0
0,0
etc.
Negative Motion:
Hor1,Hor2 /
Vert1,Vert2
Description
0,0
1,0
1,1
Negative Direction Sequence
0,1
0,0
etc.
FIGURE 3-1:
POSITIVE MOTION SEQUENCE
FIGURE 3-2:
NEGATIVE MOTION SEQUENCE
HOR1 or VERT1
HOR2 or VERT2
HOR1 or VERT1
HOR2 or VERT2
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