BMP180 Bosch Sensortec, BMP180 Datasheet - Page 18

• Manufacturer Part Number: BMP180
• Description: Specifications: Lead Free Status: Lead Free ; RoHS Status: RoHS Compliant
• Manufacturer: Bosch Sensortec

4. Global Memory Map
The memory map below shows all externally accessible data registers which are needed to operate
BMP180. The left columns show the memory addresses. The columns in the middle depict the
content of each register bit. The colors of the bits indicate whether they are read-only, write-only or
read- and writable. The memory is volatile so that the writable content has to be re-written after each
power-on.
Not all register addresses are shown. These registers are reserved for further Bosch factory testing
and trimming.
Measurement control (register F4h <4:0>): Controls measurements. Refer to table 6 for usage
details.
Sco (register F4h <5>): Start of conversion. The value of this bit stays “1” during conversion and is
reset to “0” after conversion is complete (data registers are filled).
Oss (register F4h <7:6>): controls the oversampling ratio of the pressure measurement (00b: single,
01b: 2 times, 10b: 4 times, 11b: 8 times).
Soft reset (register E0h): Write only register. If set to 0xB6, will perform the same sequence as
power on reset.
Chip-id (register D0h): This value is fixed to 0x55 and can be used to check whether
communication is functioning.
After conversion, data registers can be read out in any sequence (i.e. MSB first or LSB first). Using a
burst read is not mandatory.
BST-BMP180-DS000-07 | Revision 2.3 | May 2011
© 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
out_xlsb
out_lsb
out_msb
ctrl_meas
soft reset
id
calib21 downto calib0
parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
Register Name
F8h
F7h
F6h
F4h
E0h
D0h
BFh down to AAh
Register Adress
Registers:
Type: read / write
registers
Control
bit7
oss<1:0>
Calibration
read only
registers
Figure 6: Memory map
bit6
Data sheet
adc_out_xlsb<7:3>
BMP180
read only
registers
Data
bit5
sco
calib21<7:0> down to calib0<7:0>
read only
adc_out_msb<7:0>
adc_out_lsb<7:0>
Fixed
bit4
id<7:0>
reset
bit3
measurement control
bit2
0
bit1
0
Page 18
bit0
0
Bosch Sensortec
Reset state
00h
00h
80h
00h
00h
55h
n/a