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BMP280 Datasheet(PDF) 29 Page - Bosch Sensortec GmbH

Part # BMP280
Description  Digital Pressure Sensor
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Manufacturer  BOSCH [Bosch Sensortec GmbH]
Direct Link  https://www.bosch-sensortec.com
Logo BOSCH - Bosch Sensortec GmbH

BMP280 Datasheet(HTML) 29 Page - Bosch Sensortec GmbH

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Datasheet
BMP280 Digital Pressure Sensor
Page 29
BST-BMP280-DS001-19 | Revision 1.19 | January 2018
Bosch Sensortec
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third
parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice. Not intended for publication.
as BMP180’s I²C address. The SDO pin cannot be left floating; if left floating, the I²C address will
be undefined.
The I²C interface uses the following pins:
 SCK: serial clock (SCL)
 SDI:
data (SDA)
 SDO: Slave address LSB (GND = ‘0’, VDDIO = ‘1’)
CSB must be connected to VDDIO to select I²C interface. SDI is bi-directional with open drain to
GND: it must be externally connected to VDDIO via a pull up resistor. Refer to chapter 6 for
connection instructions.
The following abbreviations will be used in the I²C protocol figures:
 S
Start
 P
Stop
 ACKS
Acknowledge by slave
 ACKM
Acknowledge by master
 NACKM
Not acknowledge by master
5.2.1 I²C write
Writing is done by sending the slave address in write mode (RW = ‘0’), resulting in slave address
111011X0 (‘X’ is determined by state of SDO pin. Then the master sends pairs of register
addresses and register data. The transaction is ended by a stop condition. This is depicted in
Figure 7.
Start
RW ACKS
ACKS
ACKS
1
1
1
0
1
1
X
0
1
0
1
0
0
0
0
0
bit7
bit6
bit5
bit4
bit3
bit2
bit1 bit0
ACKS
ACKS
Stop
1
0
1
0
0
0
0
1
bit7
bit6
bit5
bit4
bit3
bit2
bit1 bit0
Register data - address A0h
Register address (A0h)
Register address (A1h)
S
Slave Address
Control byte
Data byte
Control byte
Data byte
P
Register data - address A1h
Figure 7: I²C multiple byte write (not auto-incremented)
5.2.2 I²C read
To be able to read registers, first the register address must be sent in write mode (slave address
111011X0). Then either a stop or a repeated start condition must be generated. After this the
slave is addressed in read mode (RW = ‘1’) at address 111011X1, after which the slave sends
out data from auto-incremented register addresses until a NOACKM and stop condition occurs.
This is depicted in Figure 8, where two bytes are read from register 0xF6 and 0xF7.


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