Dual SPM Detector
Page 5 of 16
MX641 Preliminary Information
Pin
No.
Name
Type
Description
19
20
21
22
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
Chip Select
Sensitivity mode this input should be connected to either V or V
.
SS
DD
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
Sensitivity mode this input should be connected to either V or V
.
SS
DD
Serial Data
System Select
N/C
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
either V or V
.
SS
DD
input 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 should be tied to V or left unconnected. This
DD
pin has an internal pull-up resistor on chip.
No internal connection; leave open circuit.
23
24
V
DD
power 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 V by a capacitor mounted close to
SS
the pin
Table 1: Signal List
ã2001 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480115.004
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