FX641 Просмотр технического описания (PDF) - CML Microsystems Plc

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FX641

Dual Subscriber Private Metering (SPM) Detector

CML Microsystems Plc 

Pin Number

Function

FX641

D2/P4

1

Xtal/Clock: The input to the on-chip clock oscillator; for use with a 3.579545MHz Xtal in conjunction

with the Xtal output; circuit components are on-chip. When using a Xtal input, the Clock Out pin

should be connected directly to the Clock In pin. If a clock pulse input is employed to the Clock In pin,

this (Xtal/Clock) pin must be connected directly to VDD (see Figure 2). See Figure 4 for details of clock

frequency distribution.

2

Xtal: The output of the on-chip clock oscillator inverter.

3

Clock Out: The buffered output of the on-chip-clock oscillator inverter. If a Xtal input is employed,

this output should be connected directly to Clock In pin. This output can support up to 3 additional

FX641 microcircuits. See Figure 4 for details of clock frequency distribution.

4

Clock In: The 3.579545 clock pulse input to the internal clock dividers. If an externally generated

clock pulse input is employed, the Xtal/Clock input pin should be connected to VDD.

5

Output Enable: For multi-chip output multiplexing; controls the state of both Ch1 and Ch2 outputs.

When this input is placed high (logic '1') both outputs are set to a high impedance. When placed low

(logic '0') both outputs are enabled.

6

Ch 2 Output: The digital output of the Channel 2 SPM detector when enabled. The format of the

signal at this pin, in common with Ch 1, is selectable to either 'Tone Follower' or 'Packet' mode via the

Output Select input.

7

Ch 1 Output: The digital output of the Channel 1 SPM detector when enabled. The format of the

signal at this pin, in common with Ch 2, is selectable to either 'Tone Follower' or 'Packet' mode via the

Output Select input.

8

VBIAS: The output of the on-chip analogue bias circuitry. Held internally at VDD/2, this pin should be

decoupled to VSS (see Figure 2).

9

Ch 1 Amp Out: The output of the Channel 1 Input Amplifier. See Figures 2 and 3.

10 Ch 1 Amp In (-): The negative input to the Channel 1 Input Amplifier. See Figures 2 and 3.

11 Ch 1 Amp In (+): The positive input to the Channel 1 Input Amplifier. See Figures 2 and 3.

12

VSS: Negative supply rail (GND).

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