NXP Semiconductors
FXPS7115D4
Digital absolute pressure sensor, 40 kPa to 115 kPa
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.
S
SLAVE ADDRESS
W
A
REGISTER ADDRESS
A
rSTART
SLAVE ADDRESS
R
A
REGISTER DATA
N
P
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
None
0
0
0
1
Address wraps around from $FF to $00
Address wraps from $63 (SNSDATA0_H) to $61
(DEVSTAT_COPY)
DEVSTAT_COPY, SNSDATA0_L, SNSDATA0_H
1
1
0
1
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
FXPS7115D4
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© NXP B.V. 2019. All rights reserved.
Product data sheet
Rev. 3 — 5 December 2019
17 / 72
NXP [ NXP ]
