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3
Overview of Functions/Operation
Initial
powerup
Reading
coefficient data
Data conversion
Compensated
pressure reading
Shutdown
Figure 2. Sequence Flow Chart
The MPL115A interfaces to a host (or system) microcontroller in the user ’s application. All communications are via I 2 C. A typical
usage sequence is as follows:
Initial Power-up
All circuit elements are active. I 2 C port pins are high impedance and associated registers are cleared. The device then enters
standby mode.
Reading Coefficient Data
The user then typically accesses the part and reads the coefficient data. The main circuits within the slave device are disabled
during read activity. The coefficients are usually stored in the host microcontoller local memory but can be re-read at any time.
It is not necessary to read the values stored in the host microcontroller multiple times because the coefficients within a device
are constant and do not change. However, note that the coefficients will be different from device to device, and cannot be used
for another part.
Data Conversion
This is the first step that is performed each time a new pressure reading is required which is initiated by the host sending the
CONVERT command. The main system circuits are activated (wake) in response to the command and after the conversion
completes, the result is placed into the Pressure and Temperature ADC output registers.
The conversion completes within the maximum conversion time, tc (see Row 7 , in the Operating Characteristics Table). The
device then enters standby mode.
Compensated Pressure Reading
After the conversion has been given sufficient time to complete, the host microcontroller reads the result from the ADC output
registers and calculates the Compensated Pressure, a barometric/atmospheric pressure value which is compensated for
changes in temperature and pressure sensor linearity. This is done using the coefficient data from the MPL115A and the raw
sampled pressure and temperature ADC output values, in a compensation equation (detailed later). Note that this is an absolute
pressure measurement with a vacuum as a reference.
From this step the host controller may either wait and then return to the Data Conversion step to obtain the next pressure reading
or it may go to the Shutdown step.
MPL115A2
Sensors
4
Freescale Semiconductor, Inc.
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相关PDF资料
KITMPVZ5004EVK
KIT EVAL PRESSURE SENS BOARD
KN500B1/4
SWITCH KNOB STRAIGHT .50" BLACK
KN5700B1/4
SWITCH KNOB STRAIGHT .75" BLACK
KN700B1/4
SWITCH KNOB STRAIGHT .75" BLACK
KS-100
PROTECTIVE COVER FOR RELAYS
KTKK-0500
CONN HEAT SHRINK TUBE SZ 8 STR
KTKK-0674
CONN HEAT SHRINK TUBE SZ E STR
KTKK-1123
CONN HEAT SHRINK TUBE SZ D ANG
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