KP236

Analog Absolute Pressure Sensor

Specification

Data Sheet

17

Revision 1.0, 2010-06-21

3

Specification

3.1

Application Circuit Example

It is recommended to protect the pressure sensor IC against overload and electro-magnetic interferences (as

shown in

Figure 10).

The output circuit acts as a low-pass decoupling filter between the sensor IC output and the A/D input of the

microcontroller.

The shown application circuit example considers an increased cable length between the sensor and the

microcontroller. A combined location on a PCB with reduced distance between the sensor and the controller allows

a reduction of the numbers of the passive components (e.g.

C

Figure 10

Application circuit example

Note: It is recommended to leave the digital pins CLOCK/V

open GND connection, the floating pins prevent from a cross grounding through the corresponding ESD

diodes).

Table 5

Component Values

Component

Symbol

Values

Unit

Min.

Typ.

Max.

Pull-Up Resistor

R

1

5

59

100

k

Ω

Pull-Down Resistor

R

2

5

59

100

k

Ω

Low Pass Resistor

R

3

3.9

22

100

k

Ω

Supply Blocking Capacitor

C

1

10

100

100

nF

Output Blocking Capacitor

C

2

0

100

100

nF

Low Pass Capacitor

C

3

10

100

100

nF

Microcontroller

ADC

Ref

A/D in

GND

5V

C

1

C

2

R

1

R

2

R

3

C

3

*)

*)

KP

2xx

2

CLOCK /

5

GND

6

7

GND

8

n.c.

n.c.

n.c.

n.c.