MPS-301A World Products, Inc., MPS-301A Datasheet - Page 5

• Manufacturer Part Number: MPS-301A
• Description: Integrated, Absolute Pressure Sensor
• Manufacturer: World Products, Inc.

SCL
SDA
I
For I
this communication.
The I
i)
ii) Start Condition: A high to low transition on SDA while SCL is high indicates a start condition. Every command has
iii) Stop Condition: A low to high transition on SDA while SCL is high indicates a stop condition. A command has to
iv) Valid Data: Data is transmitted in bytes (8 bits), MSB first. SDA transmits the data, while SCL clocks the data. Each
v) Acknowledge Bit: Acknowledge after a transmitted byte is necessary. The transmitting device must generate an
vi) Addressing: the slave address of the sensor is hard wired 7 bit address 0x78. This address cannot be changed.
vii) Read Operation: After power on the master should send a read request to the sensor according to the figure below.
2
C INTERFACE DESCRIPTION (OPTION I)
and should not be used by the customer.
be closed by a stop condition to start processing the command routine inside the Sensor
Idle period : During inactivity the SDA and SCL are pulled to supply voltage Vdd
The master sends the address byte containing the 7 bit slave address followed by a read/write byte. ‘ 1’ indicates
a read and ‘ 0’ indicates a write. The write operation is used exclusively by the manufacturer for calibration purposes
The master must generate the transmission clock on SCL and followed by the acknowledge bit for each data
byte except the last which is sent by the sensor.
Integrated, Absolute Pressure Sensor
to be initiated by a start condition sent by the master. A master can always generate a start condition
then clocking SCL from high to low. Transmitted bits are valid after a start condition only if SDA keeps at constant
level during the high period of SCL. The SDA level has to change only when clock signal SCL is low.
acknowledge related clock pulse. The receiver (slave or master) pulls down the SDA line during the acknowledge
clock pulse. If no acknowledge is generated by the receiver the transmitting device will become inactive.
A transmitting master can abort the transmission by generating a stop condition and may repeat the command.
byte transmitted is followed by an acknowledge bit. A bit is transferred by pulling SCL low, placing the data on SDA,
2
2
C communication only two pins are used namely SDA (Pin 5) and SCL (Pin 4). The sensor behaves as a slave in
Start
Condition
C protocol is defined as follows:
MPS-301A
Valid
Data
Proper
Change of
Data
1907 Westlands Centre, 20 Westlands Road, Quarry Bay, Hong Kong
Tel : [phone]
Email : [e-mail]
Website : www.jlworld.com
Stop
Condition
Fax : [phone]
Document #E:DS-SHPS-MPS301A Rev A
060347-A2
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