bmp280 datasheet

Bosch
Sensortec | BMP280 Data sheet
31 |
48
Modifications reserved | Data subject to change without notice
Document number: BST-BMP280-DS001-23 Revision_1.23_11202
0
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
V
DDIO
=1.2V to 3.6V
0.2 *
V
DDIO
V
Input – high level
Vih_si
V
DDIO
=1.2V to 3.6V
0.8 *
V
DDIO
V
Output – low level for I2C
Vol_SDI
V
DDIO
=1.62V, iol=3 mA
0.2 *
V
DDIO
V
Output – low level for I2C
Vol_SDI
_1.2
V
DDIO
=1.20V, iol=3 mA
0.23 *
V
DDIO
V
Output – low level Vol_SD
O
V
DDIO
=1.62V, iol=1 mA 0.2 *
V
DDIO
V
Output – low level
Vol_SD
O_1.2
V
DDIO
=1.20V, iol=1 mA
0.23 *
V
DDIO
V
Output – high level
Voh
V
DDIO
=1.62V, ioh=1 mA
(SDO, SDI)
0.8 *
V
DDIO
V
Output – high level
Voh_1.2
V
DDIO
=1.2V, ioh=1 mA
(SDO, SDI)
0.6 *
V
DDIO
V
Pull-up resistor
Rpull
Internal pull-up
resistance to V
DDIO
70
120
190
kΩ
I
2
C bus load capacitor
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.