MLX90308CAB
Programmable Sensor Interface
MLX90308CAB Programmable Sensor Interface
Page 8
Rev 3.0 21/May/01
Pin
Signal
Name
Description
1,2
I/O1, 2
Bi-directional I/O. Can also be used as input to A/D converter. I/O can be
controlled by serial communications or by firmware as alarm inputs or level
out. (unconnected when not used)
3
TSTB
Test pin for Melexis production testing. (in normal application connected to
VDD)
4
FLT
Filter pin; allows for connection of a capacitor to the internal analog path.
5
OFC
Offset control output. Provides access to the internal programmed offset
control voltage for use with external circuitry. (unconnected when not used)
6,7
VBN,VBP
Bridge inputs, negative and positive.
8
TMP
Temperature sensor input. An external temperature sensor can be used in
conjunction with the internal one. The external sensor can provide a
temperature reading at the location of the bridge sensor.
9
VDD
Regulated supply voltage. Used for internal analog circuitry to ensure accurate
and stable signal manipulation.
10
FET
Regulator FET gate control. For generating a stable supply for the bridge
sensor and internal analog circuitry (generates regulated voltage for VDD).
11
VDD1
Unregulated supply voltage. Used for digital circuitry and to generate FET
output.
12
VMO
Voltage mode output. Compensated sensor output voltage.
13
CMO
Current mode output. Compensated sensor output for current mode operation.
14
CMN
Current mode negative rail. Current mode return path.
15
GND
Power supply return.
16
COMS
Serial communications pin. Bi-directional serial communication signal for
reading and writing to the EEPROM.
Table 3. Pin Description
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
IO1
IO2
TSTB
FLT
OFC
VBN
VBP
TMP
COMS
GND
CMN
CMO
VMO
VDD1
FET
VDD
Figure 2. Pinout (SO16W (LW) Package)
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