FXPS7115D4 datasheet(12/72 Pages) NXP

12 / 72 page

NXP Semiconductors

FXPS7115D4

Digital absolute pressure sensor, 40 kPa to 115 kPa

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TEMPERATURE

∑

CONVERTER

SINC

FILTER

OFFSET

AND

GAIN TRIM

to temperature output

temperature sensor

MOVING

AVERAGE

Figure 12. Temperature sensor signal chain block diagram

7.3.4.2 Temperature sensor output scaling equation

Equation 5 is used to convert temperature readings with the variables specified in Table 8.

(5)

Where:

TDEGC = The temperature output in degrees C

TLSB = The temperature output in LSB

T0LSB = The expected temperature output in LSB at 0 °C

TSENSE = The expected temperature sensitivity in LSB/°C

Data reading

T0LSB (LSB)

TSENSE LSB/C)

8-bit register read

Table 8. Temperature conversion variables

7.3.5 Common mode error detection signal chain

The device includes a continuous pressure transducer common mode error detection. A simplified block

diagram is shown in Figure 13. The common mode error signal is compared against the normal absolute

pressure signal. If the comparison falls outside pre-determined limits, the CM_ERROR bit in the DSP_STAT

"DSP_STAT - DSP specific status register (address 60h)".

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SINC

FILTER

COMPENSATION

common mode

error signal

common mode

signal from ADC

LOW PASS

FILTER

Figure 13. Common mode error detection signal chain block diagram

7.4 Inter-integrated circuit (I2C) interface

The device includes an interface compliant to the NXP I2C-bus specification[4]. The device operates in client

mode and includes support for standard mode, fast mode, and fast mode plus, although the maximum practical

operating frequency for I2C in a given system implementation depends on several factors including the pull-up

resistor values and the total bus capacitance.

7.4.1 I2C bit transmissions

The state of SDA when SCL is high determines the bit value being transmitted. SDA must be stable when SCL

is high and change when SCL is low as shown in Figure 14. After the START signal has been transmitted by the

host, the bus is considered busy. Timing for the start condition is specified in Table 105.

FXPS7115D4

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 6.2 — 28 June 2023

12 / 72

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