MX805AP 查看數據表（PDF） - MX-COM Inc

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MX805AP

Sub-Audio Signaling Processor

MX-COM Inc  

Sub-Audio Signaling Processor

6

MX805A

Pin

Signal

Description

21 Comparator Out

This is the output of the ‘comparator’ amplifier. This node is also connected

internally to the input of the /digital Noise Filter (See Figure 1). When both

decoders (CTCSS or NRZ) are powersaved, this output is at a logic ‘0’.

22 Notone Timing

External RC components connected to this pin form the timing mechanism of a

Notone period timer. The external network determines the “charge rate” of the

timer to VBIAS. The expiration of the timer will cause an interrupt. This function is

only used in the CTCSS RX mode. See page 9.

23 Wake

This ‘real time’ input can be used to reactivate the MX805A from the ‘Powersave

All’ condition using an externally derived signal. The MX805A will be in

‘Powersave All’ condition when both this pin and bit 0 of the Control Register are

set to a logic ‘1’. Recovery from ‘Powersave All’ is achieved by putting either the

Wake pin or the ‘Powersave All” bit at logic ‘0’. This allows MX805A activation by

the microcontroller or an external signal, such as RSSI or Carrier Detect.

24 VDD

Positive Supply. A single 5.0V regulated supply is required.

Note: More information on external components and the DBS800 system integration of the MX805A are

contained in the DBS800 System Support Documentation. Guidance on the generation and

manipulation of NRZ and RX and TX data is given in the DBS800 Application support documentation.

C-BUS: This is MX-COM’s proprietary standard for the transmission of commands and data between a

microcontroller and DBS8000 microcircuits. It may be used with any microcontroller, and can, if

desired, take advantage of the hardware and serial I/O functions embodied into many types of

microcontroller. The C-BUS data rate is determined by the microcontroller.

Table 1: Signal List

RX CTCSS Tone Measurement Completed

CTCSS NOTONE Timer Expired

1 NRZ RX Data Byte Received

New NRZ Data Received Before Last Byte Read

NRZ TX Buffer Ready

NRZ Data Transmission Complete

Table 2: Interrupt Conditions

1998 MX-COM, Inc.

www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054

Doc. # 20480116.004

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