[2SMPB-02E] Datasheet Rev.05(Jun.,2017)

9

Copyright 2017 OMRON Corporation. All Rights Reserved.

4. Operations

4.1 Communication Mode

This sensor is corresponding to I²C and SPI communication.

Digital interface terminal functions for each communication mode are as below.

Communication mode

CSB

SDI

SCK

SDO

Remark

I²C

VDDIO

SDA

SCL

GND/VDDIO

SDO=GND

→70h、SDO=VDDIO→56h

SPI

3 Wires

CSB

SDI/O

SCK

-

spi3w Register = 1

SPI

4 Wires

CSB

SDI

SCK

SDO

spi3w Register = 0

When changing the communication mode, also see Typical Connection Diagram section.

1)

I²C mode becomes effective by pulling CSB up to VDDIO.

2)

SPI mode becomes effective by pulling CSB down to GND.

3)

Once CSB is pulled down, SPI mode would not be changed unless otherwise Power on Reset (POR) or Asyn-

chronous Reset. Switching between SPI 3-Wire mode and SPI 4-Wire mode can be configured with the register

value

of “spi3w”. Refer to IO_SETUP register section for more detail.

4)

Default mode after POR or Asynchronous Reset will be I²C mode.

4.2 Power Mode

This sensor has three power modes and it can be switched by setting CTRL_MEAS register.

Refer to the

“CTRL_MEAS” register section for more detail.

・

Sleep mode

・

Normal mode

・

Forced mode

Transition diagram for each mode is as follows.

1)

Sleep Mode (Power Reduction Mode)

No measurements are performed.

I²C/SPI interface and each register can be accessed even if the sensor is in sleep mode.

2)

Forced Mode

In case of Forced Mode, a single measurement is performed. When the set up measurement is finished,

the sensor returns to Sleep Mode after storing the measurement data to the register.

3)

Normal Mode

In case of Normal Mode, the measurements are performed repeatedly between a measurement period and

a standby period.

The standby time can be configured

by “t_stanby[1:0]” register. Be sure to consider

that the data must be read from the master side after a Normal Mode.

Power ON

POR

Down load OTP

Sleep Mode

Normal Mode

Forced Mode

Asynchronous Reset

(Reset [ 7 : 0 ] = E6h

Power_mode[1:0]=11

Power_mode[1:0]=00

Power_mode[1:0]=01 or 10

Power_mode[1:0]=01 or 10

P

ow er on

Pow er Off　・・

・・・・

Read　COE_**

pow er_mode[1:0] = 01 or 10

pow er_mode[1:0] = 01 or 10

Temperature Measurement x temp_av erage[2:0]

Pressure Measurement x temp_av erage[2:0]

Temperature Measurement x temp_av erage[2:0]

sleep

sleep

POR

Dow nload OTP

P

ow er on

Pow er Off　・・

・・・・

Read　COE_**

pow er_mode[1:0] = 11

sleep

Temperature Measurement x temp_av erage[2:0]

t_stanby [s]

POR

Dow nload OTP

sleep

Temperature Measurement x temp_av erage[2:0]

Pressure Measurement x temp_av erage[2:0]