FXPS7115D4 datasheet(13/72 Pages) NXP

13 / 72 page

NXP Semiconductors

FXPS7115D4

Digital absolute pressure sensor, 40 kPa to 115 kPa

FXPS7115D4

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Product data sheet

Rev. 3 — 5 December 2019

13 / 72

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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

7.3.5.2 Temperature sensor output scaling equation

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

Table 7.

(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

Table 7. Temperature conversion variables

Data reading

T0LSB (LSB)

TSENSE LSB/C)

8-bit register read

7.3.6 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

of pre-determined limits, the CM_ERROR bit in the DSP_STAT register is set. Once the

error condition is removed, the CM_ERROR bit is cleared as specified in Section 7.7.16

"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[3]. The

device operates in slave 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.

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