CMX813 Просмотр технического описания (PDF) - MX-COM Inc
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CMX813 Datasheet PDF : 19 Pages
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CMX813 Multi-Standard Analog Paging Decoder
5
3. External Components
CMX813 Advance Information
SERIAL CLOCK
COMMAND DATA
REPLY DATA
VDD
CS
R2
IRQ
VSS
1
16
2
15
3
14
4
13
CMX813
5
12
VDD
XTAL
VDD
C4
XTAL/CLOCK
see inset
6
11
AMPOUT
7
10
8
9 SIGNAL IN C5
R3
XTAL
C2
15
R1 X1
C1
14
XTAL/CLOCK
inset
R4 C3
Figure 2: Recommended External Components
C1 18pF ±20%
C2 18pF ±20%
C3 68nF ±20%
C4 0.1µF ±20%
C5 22pF ±20%
R1
1MΩ
±5%
R2
22kΩ
±10%
R3
1MΩ
±10%
R4
51kΩ
±10%
X1 3.5795450MHz ±100ppm
Table 2: Recommended External Components
4. General Description
When the CMX813 detects the start of a tone, it generates an interrupt and reports which tone was detected.
At the end of the tone, it will produce an interrupt and report Notone detected. The host micro should measure
and interpret the tone lengths and gap lengths according to calling code requirements. The device is not
designed for the decoding of multiple tones that are present simultaneously.
In 2-tone mode, the parameters for decoding each tone in the tone table are stored in a decoding ROM, and
any one of these tones can be selected for decoding via an 8-bit ROM address. Up to eight 8-bit ROM
addresses can be selected by the host micro for decoding. These are held in an internal address RAM which
downloads the addresses sequentially to the ROM and retrieves the tone decode parameters and matches
these with the received signal to a find tone decode. If a match is found, the CMX813 generates an interrupt
and reports the decoded tone table ROM address. The device can therefore decode any number of single or
2-tone pager codes, formed by any combination of up to 8 different frequencies, received in any order.
In 5/6 tone and HSC modes, the tone parameters are stored in ROM in groups of 16 tones in accordance with
the various international tonesets (CCIR/ZVEI etc.). Any one of these groups can be selected for decoding at
any time. ROM address sequencing is automatic. When any one of the 16 tones in that group is decoded, the
device interrupts and reports the group and tone number of the tone (8 bits).
The input amplifier with suitable external components is used to adjust the received signal to the correct
amplitude for the decoder. All functions are controlled over a C-BUS serial µC interface.
¤2000 MX-COM, Inc.
www.mxcom.com tel: 336 744 5050 800 638 5577 fax: 336 744 5054
Doc. # 20480220.002
4800 Bethania Station Road, Winston-Salem, NC 27105-1201, USA All trademarks and service marks are held by their respective customers.
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