Dual SPM Detector

Page 5 of 16

MX641 Preliminary Information

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Pin

No.

Name

Type

Description

19

Select

Chip

input

The Chip Select input for use in data loading when using the MX641 in

the Controlled Sensitivity mode (see Figure 9). The device is selected

when this input is set low (logic '0'). When the MX641 is in the Fixed

20

Serial Clock

input

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

21

Serial Data

input

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

22

System Select

input

In the Fixed Sensitivity mode this pin selects the system frequency.

High (logic ‘1’) = 12kHz; Low (logic ‘0’) = 16kHz. In the Controlled

pin has an internal pull-up resistor on chip.

23

N/C

No internal connection; leave open circuit.

24

power

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

levels and voltages within the MX641 are dependent upon this supply.

the pin

Table 1: Signal List