FXPS7115D4 datasheet(17/72 Pages) NXP

17 / 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

17 / 72

7.4.6.2 Register read transfers

The device supports I2C register read data transfers. Register read data transfers are

constructed as follows:

1. The master transmits a START condition.

2. The master transmits the 7-bit slave address.

3. The master transmits a '0' for the read/write bit to indicate a write operation.

4. The slave transmits an ACK.

5. The master transmits the register address to be read.

6. The slave transmits an ACK.

7. The master transmits a repeat START condition.

8. The master transmits the 7-bit slave address.

9. The master transmits a '1' for the read/write bit to indicate a read operation.

10.The slave transmits an ACK.

11.The slave transmits the data from the register addressed.

12.The master transmits a NACK.

13.The master transmits a STOP condition.

rSTART

SLAVE ADDRESS

Master transmission

Slave transmission

aaa-029919

7.4.6.3 Sensor data register read wrap around

The device includes automatic sensor data register read wrap-around features to

optimize the number of I2C transactions necessary for continuous reads of sensor data.

Depending on the state of the SIDx_EN bits in the SOURCEID_0 and SOURCEID_1

registers, the register address automatically wraps back to the DEVSTAT_COPY register

as shown in Table 8.

Table 8. Sensor data register read wrap-around description

SID1_EN

SID0_EN

Address increment and wrap-around effect

Optimized register-read sequence

Address wraps around from $FF to $00

None

Address wraps from $63 (SNSDATA0_H) to $61

(DEVSTAT_COPY)

DEVSTAT_COPY, SNSDATA0_L, SNSDATA0_H

Address wraps from $65 (SNSDATA1_H) to $61

(DEVSTAT_COPY)

DEVSTAT_COPY, SNSDATA0_L, SNSDATA0_H,

SNSDATA1_L, SNSDATA1_H

Address wraps from $69 (SNSDATA0_TIME3) to $61

(DEVSTAT_COPY)

DEVSTAT_COPY, SNSDATA0_L, SNSDATA0_H,

SNSDATA1_L, SNSDATA1_H, SNSDATA0_TIME0,

SNSDATA0_TIME1, SNSDATA0_TIME2, SNSDATA0_

TIME3

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