Pressure sensors

Barometric pressure transmitters for SMT

ASB series

Preliminary data

AS SEN PD

2011-05-02

Please read Cautions and warnings and

Page 6 of 16

Important notes at the end of this document

.

Output Characteristics

Application Circuit

pressure:

temperature:

-50°C

150°C

0 digits

2047 digits

0°C

512 digits

-50°C

150°C

0 digits

2047 digits

0°C

512 digits

Conversion Formula

pressure:

(

)

(

)

min

,

min

,

min

,

max

,

r

p

out

p

meas

p

FS

r

r

meas

p

D

D

D

p

p

p

+

−

⋅

−

=

temperature:

[ ]

235

.

10

512

−

=

°

T

meas

meas

D

C

T

GND

1

2

4

3

SCL

V

supply

SDA

0.1µF

GND

1

2

4

3

SCL

V

supply

SDA

0.1µF

Sleep Mode

After the command window, the sensor’s signal processor will power down and fall into sleep mode. To wake up the

sensor’s signal processor the master must send a Read_MR (measurement request operation) command or a Write_MR

(reduced measurement request operation) command.

After completion of the measurement cycle the data can be transmitted via a data fetch operation and the sensor’s signal

processor will power down and fall into sleep mode again.

Command

Window

Temperature

Measurement

Pressure

Measurement

DSP

Calcs.

Power

Down

Power

Down

Temperature

Measurement

Sensor‘s Digital Signal

Processor Activity

Serial Interface Activity

Power ON

reserved

Read_MR

Wakes Sensor‘s

Signal Processor

Read_DF

Invalid Values

Write New Data

To Output Register

Read_DF

Valid Reading

Read_MR

Wakes Sensor‘s

Signal Processor

Appr. 4.42 ms

Command

Window

Temperature

Measurement

Pressure

Measurement

DSP

Calcs.

Power

Down

Power

Down

Temperature

Measurement

Sensor‘s Digital Signal

Processor Activity

Serial Interface Activity

Power ON

reserved

Read_MR

Wakes Sensor‘s

Signal Processor

Read_DF

Invalid Values

Write New Data

To Output Register

Read_DF

Valid Reading

Read_MR

Wakes Sensor‘s

Signal Processor

Appr. 4.42 ms

Command

Window

Temperature

Measurement

Pressure

Measurement

DSP

Calcs.

Power

Down

Power

Down

Temperature

Measurement

Sensor‘s Digital Signal

Processor Activity

Serial Interface Activity

Power ON

reserved

Read_MR

Wakes Sensor‘s

Signal Processor

Read_DF

Invalid Values

Write New Data

To Output Register

Read_DF

Valid Reading

Read_MR

Wakes Sensor‘s

Signal Processor

Appr. 4.42 ms

Command

Window

Temperature

Measurement

Pressure

Measurement

DSP

Calcs.

Power

Down

Power

Down

Temperature

Measurement

Sensor‘s Digital Signal

Processor Activity

Serial Interface Activity

Power ON

reserved

Read_MR

Wakes Sensor‘s

Signal Processor

Read_DF

Invalid Values

Write New Data

To Output Register

Read_DF

Valid Reading

Read_MR

Wakes Sensor‘s

Signal Processor

Appr. 4.42 ms

Command

Window

Pressure

Measurement

DSP

Calcs.

Power

Down

Power

Down

Temperature

Measurement

Sensor‘s Digital Signal

Processor Activity

Serial Interface Activity

Power ON

reserved

Write_MR

Wakes Sensor‘s

Signal Processor

Read_DF

Invalid Values

Write New Data

To Output Register

Read_DF

Valid Reading

Read_MR

Wakes Sensor‘s

Signal Processor

Appr. 1.62 ms

Command

Window

Pressure

Measurement

DSP

Calcs.

Power

Down

Power

Down

Temperature

Measurement

Sensor‘s Digital Signal

Processor Activity

Serial Interface Activity

Power ON

reserved

Write_MR

Wakes Sensor‘s

Signal Processor

Read_DF

Invalid Values

Write New Data

To Output Register

Read_DF

Valid Reading

Read_MR

Wakes Sensor‘s

Signal Processor

Appr. 1.62 ms

Command

Window

Pressure

Measurement

DSP

Calcs.

Power

Down

Power

Down

Temperature

Measurement

Sensor‘s Digital Signal

Processor Activity

Serial Interface Activity

Power ON

reserved

Write_MR

Wakes Sensor‘s

Signal Processor

Read_DF

Invalid Values

Write New Data

To Output Register

Read_DF

Valid Reading

Read_MR

Wakes Sensor‘s

Signal Processor

Appr. 1.62 ms

Command

Window

Pressure

Measurement

DSP

Calcs.

Power

Down

Power

Down

Temperature

Measurement

Sensor‘s Digital Signal

Processor Activity

Serial Interface Activity

Power ON

reserved

Write_MR

Wakes Sensor‘s

Signal Processor

Read_DF

Invalid Values

Write New Data

To Output Register

Read_DF

Valid Reading

Read_MR

Wakes Sensor‘s

Signal Processor

Appr. 1.62 ms