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MX641DW

Dual SPM Detector

MX-COM Inc  

Dual SPM Detector

5

MX641 PRELIMINARY INFORMATION

Pin No.

20

21

22

23

24

Name

Serial Clock

Serial Data

System Select

N/C

VDD

Type

input

input

input

power

Description

The Serial Clock input for use in data loading when using the MX641 in the

Controlled Sensitivity mode (see Figure 9). Data is loaded to the MX641 on

this clock's rising edge. When the MX641 is in the Fixed Sensitivity mode this

input should be connected to either VSS or VDD.

The Serial Data input for use in data loading when using the MX641 in the

Controlled Sensitivity mode (see Figure 9 and Table 4). When the device is in

the Fixed Sensitivity mode this input should be connected to either VSS or VDD.

In the Fixed Sensitivity mode this pin selects the system frequency. High (logic

‘1’) = 12kHz; Low (logic ‘0’) = 16kHz. In the Controlled Sensitivity mode this pin

is inactive and may be left unconnected. This pin has an internal pullup

resistor on chip.

No internal connection; leave open circuit.

Positive supply rail; a single, stable power supply is required. Critical levels

and voltages within the MX641 are dependent upon this supply. This pin

should be decoupled to VSS by a capacitor mounted close to the pin

Table 1: Signal List

© 1998 MXxCOM Inc.

www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054

Doc. # 20480115.003

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