MX641DW Ver la hoja de datos (PDF) - MX-COM Inc
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MX641DW Datasheet PDF : 16 Pages
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Dual SPM Detector
7
4. General Description
MX641 PRELIMINARY INFORMATION
4.1 Xtal/Clock Distribution
The MX641 requires a 3.579545MHz Xtal or clock pulse input. With the exception of the Xtal, all oscillator components
are incorporated on chip. If a Xtal input is employed the Clock Out pin should be directly linked to the Clock In pin.
To reduce component and layout complexity, the clock requirements of up to 3 additional MX641 microcircuits may be
supplied from a Xtal-driven MX641 acting as the system master clock. With reference to Figure 3, the clock should be
distributed as illustrated and the Xtal/Clock pins of the driven microcircuits should be connected directly to VDD.
Note (see section 6.1.3) that the maximum load on the master Clock Out pin should not be exceeded.
µController
I/O Ports
Ch 2
Ch 1
CLOCK
OUT
CLOCK
IN
XTAL/CLOCK
X1
XTAL
MX641
(used as
Master
Oscillator)
VDD
3 to'N' LINE
DECODER
"OUTPUT ENABLE"
ADDRESSING
CLOCK
IN
MX641
CLOCK
IN
MX641
CLOCK
IN
MX641
Figure 3: Xtal/Clock Distribution and Output Multiplexing
4.2 Channel Outputs
Channel 1 and Channel 2 outputs operate together under the control of the Output Enable and Output Select inputs.
Table 3 describes the operations.
The digital output is pin-selectable to one of three modes:
(1) Tone Follower mode: a logic level for the period of a correct decode.
(2) Packet mode: respond/de-respond after a cumulative period of tone or notone in a fixed (intrinsic hardwired period
that is not user controlled) period.
(3) High-impedance output: for device multiplexing.
System
Select
Preset
Level
X
0
X
0
0
1
1
1
0
1
1
1
X
X
X = don’t care
Output
Select
0
1
0
0
1
1
X
Output
Enable
0
0
0
0
0
0
1
Operating Mode
Mode
Sensitivity
Frequency
Packet Mode Output; Serial Data Control (see note)
Tone Follower Output; Serial Data Control (see note)
Packet Mode Output; Fixed Sensitivity
16kHz
Packet Mode Output; Fixed Sensitivity
12kHz
Tone Follower Output; Fixed Sensitivity
16kHz
Tone Follower Output; Fixed Sensitivity
12kHz
Tristate Output (High Z)
Note: Device sensitivity and system frequency must be serially loaded
Table 3: Operating Mode Configuration
© 1998 MXxCOM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480115.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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