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參數(shù)資料
| 型號： | PE12316 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Triple Incremental Encoder |
| 中文描述： | 三增量編碼器 |
| 文件頁數(shù)： | 27/29頁 |
| 文件大小： | 1542K |
| 代理商： | PE12316 |
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PE12316
Triple
Incremental Encoder
February 6, 2003 Preliminary (Version 1.1)
Application Notes:
24 Bit Access
To provide 24 Bit counting on each channel, /A3 on pin 6 is introduced. However it has to be kept in
mind for cascading that /CARRY, /BORROW are derived from bits 0-15 of the counter to ensure
compatibility with CF32006. The first channel in the chain can only be 16 bit wide to provide the
correct interfacing signals CARRY/BORROW to the following channel. However the last channel in the
chain can use the full 24 bit.
/A3 is located on pin 6 which is an "NC" pin on CF32006. This pin was not allowed to have a
connection to the PCB board. Therefore no compatibility issue should arise.
As with all other addresslines, /A3 is low active. An internal pullup resistor ensures that /A3 can be left
unconnected, if the 24 bit feature is not used. For details see
Table 3 Memory Map
.
Possible Cascading Combinations:
First channel
Second channel
Third channel Resulting bitwidth
16 Bit
16 Bit
16 Bit
24 Bit
16 Bit
16 Bit
16 Bit
16 Bit
Table 5 Cascading bitwidths
Read Cycle:
The Readcycle is intended and designed synchronous to the clock. Special care has to be taken for
the parameter T
sus
( the setup time of the falling edge of /RD before the falling CLK edge). If T
sus
is not
within spec, there is the possibility that the output register is not updated and the same value will be
read twice. Therefore the microprocessor system collecting the data and PE12316 should either have
the same clock or the /RD on the PE12316 has to be synchronized into the PE12316 clock domain via
an ACT74 Type Flipflop.
Electrical Design Recommendations:
It is recommended that the PE12316 is used without a socket and with at least 4 decoupling
capacitors (100 nF) connected to VCC and GND close to the package.
February 6, 2003 (Preliminary Version 1.1)
Page 27/29
PE12316
none
none
16 Bit
24 Bit
32 Bit
40 Bit
48 Bit
56 Bit
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