Data sheet

BMP180

Page 18

BST-BMP180-DS000-12 | Revision 2.8 | May 2015

Bosch Sensortec

© 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

parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.

Note: Specifications within this document are subject to change without notice.

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.

Figure 6: Memory map

Measurement control (register F4h <4:0>): Controls measurements. Refer to Figure 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.

Register Name

Register Address

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

Reset

state

out_xlsb

F8h

0

0

0

00h

out_lsb

F7h

00h

out_msb

F6h

80h

ctrl_meas

F4h

sco

00h

soft

reset

E0h

00h

id

D0h

55h

calib21 downto calib0

BFh downto AAh

n/a

Registers:

Control

registers

Calibration

registers

Dat

a

registers

Fixed

Type:

calib21<7:0>downto calib0<7:0>

adc_out_xlsb<7:3

>

reset

id<7:0>

adc_out_lsb<7:0

>

adc_out_msb<7:0>

oss<1:0>

measurement

control