Data Sheet

Final Datasheet
BME280 Environmental sensor
Page 11
BST-BME280-DS001-10 | Revision 1.1 | May 2015 Bosch Sensortec
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Note: Specifications within this document are subject to change without notice.
Table 5: Absolute maximum ratings
Parameter
Condition
Min
Max
Unit
Voltage at any supply pin
V
DD
and V
DDIO
pin
-0.3
4.25
V
Voltage at any interface pin
-0.3
V
DDIO
+ 0.3
V
Storage temperature
RH
-45
+85
°C
Pressure
0
20 000
hPa
ESD
HBM, at any pin
±2
kV
CDM
±500
V
Machine model
±200
V
Condensation
No power supplied
Allowed
3. Functional description
3.1 Block diagram
Figure 2 shows a simplified block diagram of the BME280:
Logic
Pressure
front-end
OSC NVM
Voltage
reference
Voltage
regulator
(analog &
digital)
V
DDIO
GND
I
n
t
e
r
f
a
c
e
SDI
SDO
SCK
CSB
V
DD
POR
Pressure
sensing
element
Humidity
sensing
element
Humidity
front-end
Temperature
front-end
Temperature
sensing
element
ADC
Figure 2: Block diagram of BME280
3.2 Power management
The BME280 has two distinct power supply pins
 V
DD
is the main power supply for all internal analog and digital functional blocks
 V
DDIO
is a separate power supply pin used for the supply of the digital interface
A power-on reset (POR) generator is built in; it resets the logic part and the register values after
both V
DD
and V
DDIO
reach their minimum levels. There are no limitations on slope and sequence