Data Sheet

10

Revision 1.1, 2015-07-29

KP253

Digital Absolute Pressure Sensor

Functional Description

2.6

Power-Down Mode

The KP253 has a special power saving feature called the Power-down mode. The sensor will enter a sleep

mode where the power consumption is drastically reduced.

2.6.1

Entering Power-Down Mode

To enter the Power-down mode, the Trigger power-down command has to be sent to the sensor via the SPI

interface. The sensor will enter the Power-down mode within some μs.

2.6.2

Exiting Power-Down Mode

To wake-up the sensor from the Power-down mode the NCS pin needs to be low during the rising edge of the

command (e.g. Acquire pressure command). The response of the sensor during this first command must be

ignored.

With the next SPI command the pressure value from the previous acquire command will be returned.

2.7

Serial Interface

The communication and data transmission is based on a standard 16 bit serial peripheral interface (SPI).

Figure 6

SPI timing

2.7.1

Commands

The following Commands are defined:

•Acquire identifier

• Acquire temperature (incl. E2PROM check and last updated Diag1 & Diag2)1)

• Trigger power-down mode (activates the power-down state)

• Trigger diagnosis (triggers Diag1 and Diag2)

• Trigger test mode (entry into test mode only occurs if this is the first command received after power up, in

1) Last updated diagnosis information is only available if the Trigger diagnosis command was sent at any time before and the

diagnostic reset is not active (Reset-bit C12 = ‘1‘, see Chapter 2.9.1).

NCS

SCLK

SDO

SDI

MSB

MSB

LSB

LSB