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| 型號： | PPXY8300A6T1 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | Pressure Sensor |
| 英文描述： | DIFFERENTIAL, PEIZORESISTIVE PRESSURE SENSOR, RECTANGULAR, SURFACE MOUNT |
| 封裝： | SOIC-20 |
| 文件頁數(shù)： | 138/162頁 |
| 文件大小： | 4316K |
| 代理商： | PPXY8300A6T1 |
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MPXY8300 Series
Sensors
Freescale Semiconductor
77
SECTION 10 OTHER MCU RESOURCES
The microcontroller used in the MPXY8300 Series has several resources which are used to make sensor measurements and/or
communicate with the RF transmitter within the device. These modules have a range of programmable features, but are not
recommended for user control.
10.1
Analog-to-Digital Converter
The MPXY8300 Series provides a 4-channel, 10-bit analog-to-digital converter (ADC10) module. The ADC10 module is an
analog-to-digital converter using a successive approximation register (SAR) architecture with sample and hold.
When making measurements of the various analog voltages the individual blocks need to be powered up long enough to stabilize
their outputs before a conversion is started.
All of the features of the MPXY8300 Series ADC10 are the same as similar MC9S08 family devices, except that the analog
channels are connected to internal hardware as given in Table 10-1. Conversions are started and ended in the same manner as
are the various power up states.
The accuracy, power consumption and timing specifications given in the electrical specifications in Section 17 are based on using
the assigned firmware subroutines in Section 14 to make these measurements and convert them into an 8-bit or 9-bit transfer
function. These specifications cannot be guaranteed if the user creates custom software routines to make these measurements.
10.2
Serial Peripheral Interface
The serial peripheral interface (SPI) on the MPXY8300 Series is only connected and used internally to communicate between
the MCU and the RFX. The transfer of data back and forth between the two devices is handled by firmware subroutines as
described in Section 14. The user should not attempt to access the RFX using custom software.
10.3
Pressure Measurement
The MPXY8300 Series measures pressure in all members of the family. The pressure measurement consists of a P-Chip
Interface (PCI) to a pressure sensing element as shown in Figure 10-1. Control bits on the MCU operate the PCI using firmware
provided by Freescale as described in Section 14. The PCI transfers trim data to the P-CHip and measures its resulting analog
voltage output. In addition the P-Chip is powered up through the general purpose I/O port.
Table 10-1 ADC10 Channel Select
ADCH
ADC10 Channel
Input Select
Firmware Call(s)
00000
AD0
Pressure Sensor
REIMS_READ_COMP_PRESSURE
00001
AD1
Temperature Sensor
REIMS_READ_COMP_TEMP_8
00010
AD2
Bandgap Reference
REIMS_READ_COMP_VOLTAGE
00011
AD3
Reserved
n/a
00100
AD4
Reserved
n/a
00101
AD5
Acceleration Sensor
REIMS_READ_COMP_ACCEL_X
REIMS_READ_COMP_ACCEL_Z
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