Datasheet

BMP280 Digital Pressure Sensor

Page 33

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.

SDI

SCK

SDI

Figure 12: I²C timing diagram

Table 27: I²C timings

Parameter

Symbol

Condition

Min

Typ

Max

Units

SDI setup time

S&F Mode

HS mode

160

30

ns

ns

SDI hold time

S&F Mode, Cb≤100 pF

S&F Mode, Cb≤400 pF

HS mode, Cb≤100 pF

HS mode, Cb≤400 pF

80

90

18

24

115

150

ns

ns

ns

ns

SCK low pulse

HS mode, Cb≤100 pF

160

ns

SCK low pulse

HS mode, Cb≤100 pF

210

ns

The above-mentioned I2C specific timings correspond to the following internal added delays:

 Input delay between SDI and SCK inputs: SDI is more delayed than SCK by typically

100 ns in Standard and Fast Modes and by typically 20 ns in High Speed Mode.

 Output delay from SCK falling edge to SDI output propagation is typically 140 ns in

Standard and Fast Modes and typically 70 ns in High Speed Mode.

5.4.3 SPI timings

The SPI timing diagram is in Figure 13, while the corresponding values are given in Table 28. All

timings apply both to 4- and 3-wire SPI.