AMS 5105

Pressure sensor with one analog and two switching outputs

May 2012 - Rev. 2.0

Page 6/8

www.analogmicro.de

INITIAL OPERATION

The sensors are connected up electrically by mounting them on a PCB. The principle electric circuitry of

AMS 5105 with one analog and two switching outputs in use is shown in Figure 2.

For single use of the analog output it is sufficient to connect up PIN 2 (VCC), PIN 3 (GND) and PIN 4 (OUT).

In applications with a low switching current (< 4mA) it is possible to connect the logic switching outputs PIN 8

(SWITCH1) and PIN 7 (SWITCH2) directly to the load (referenced to VCC or GND). For greater switching

currents (i.e. when driving a relay) or if higher voltages are to be switched (> Vcc), an external power

transistor is necessary, such as an intelligent power FET (e.g. a PROFET ISP452 as shown in the example

at PIN 7 in Figure 2) or a power Darlington transistor (i.e. a TIP121).

PIN 5 and PIN 6 are for programming AMS 5105 only (configuration of the switching outputs and adjustment

of the thresholds and hysteresis) using the starter kit (see section "Additional Equipment").

The pressure connection is made using the two metal pressure ports (hose connectors) on top of the AMS

5105. Depending on the type of AMS 5105 and the measuring pressure, either one or two of the pressure

ports are connected up to the measuring media/volume.

For the pressures at port 1 and port 2 (for definition see Figure 3) the following requirements have to be

fulfilled (according to the definition p1 = pressure at port 1 and p2 = pressure at port 2):

Differential/relative pressure sensors:

p1 > p2

Bidirectional differential sensors:

p1 > p2 or p1 < p2 possible.

Absolute pressure sensors, barometric sensors:

p1 = measuring pressure.

Notes:

1.

The guidelines governing media compatibility must be taken into account here (see "Specification notes").

2.

For pressure connections up to 2 bar Analog Microelectronics recommends a silicone tubing (inner diameter

Ø=2mm, outer diameter Ø=6mm).

3.

ESD precautions are necessary, it is essential to ground machines and personnel properly during assembly and

handling of the device

Configuring switching outputs

By factory programming the two switching outputs are set to standard configuration (see specification note

6). Using the relevant starter kit (see section Additional Equipment) the customer can select the basic

switching function (off, normally open, normally closed, window mode) and adjust the specific threshold,

hysteresis and a delay for each switching output. For a detailed description of the switching functions and the

possible adjustments see the document “User Guide USB Starter Kit AMS 5105”.

AMS 5105

8

7

3

2

4

5V

OUT

GND

VCC

SWITCH1

SWITCH2

Voltage

Supply

5

6

BSP

452

24V

Load

RL

Figure 2: Principle electric circuitry (example)

ISP

452