Datasheet

BMP280 Digital Pressure Sensor

Page 32

BST-BMP280-DS001-19 | Revision 1.19 | January 2018

Bosch Sensortec

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Note: Specifications within this document are subject to change without notice. Not intended for publication.

Start RW

Stop

1

1

1

1

0

1

1

0

bit15

bit14

bit13

bit12 bit11 bit10

bit9

bit8

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

CSB

=

1

Data byte

Data register - address F7h

Register address (F6h)

CSB

=

0

Control byte

Data byte

Data register - address F6h

Figure 11: SPI multiple byte read

5.4 Interface parameter specification

5.4.1 General interface parameters

The general interface parameters are given in Table 26 below.

Table 26: interface parameters

Parameter

Symbol

Condition

Min

Typ

Max

Units

Input – low level

Vil_si

0.2 *

V

Input – high level

Vih_si

0.8 *

V

Output – low level for I2C

Vol_SDI

0.2 *

V

Output – low level for I2C

Vol_SDI

_1.2

0.23 *

V

Output – low level

Vol_SD

O

0.2 *

V

Output – low level

Vol_SD

O_1.2

0.23 *

V

Output – high level

Voh

(SDO, SDI)

0.8 *

V

Output – high level

Voh_1.2

(SDO, SDI)

0.6 *

V

Pull-up resistor

Rpull

Internal

pull-up

70

120

190

kΩ

Cb

On SDI and SCK

400

pF

5.4.2 I²C timings

For I²C timings, the following abbreviations are used:

 “S&F mode” = standard and fast mode

 “HS mode” = high speed mode

 Cb = bus capacitance on SDA line

All other naming refers to I²C specification 2.1 (January 2000).

The I²C timing diagram is shown in

Figure 12. The corresponding values are given in Table 27.