MPL115A1 查看數據表（PDF） - Freescale Semiconductor
零件编号
产品描述 (功能)
生产厂家
MPL115A1 Datasheet PDF : 16 Pages
| |||
Shutdown
For longer periods of inactivity the user may assert the SHDN input by driving this pin low to reduce system power consumption.
This removes power from all internal circuits, including any registers. In the shutdown state, the Pressure and Temperature
registers will be reset, losing any previous ADC output values.
This step is exited by taking the SHDN pin high. Wait for the maximum wakeup time, tw (see Row 7, in the Operating
Characteristics Table), after which another pressure reading can be taken by transitioning to the data Conversion step.
Table 2. Device Memory Map
Address
Name
Description
0x00
Padc_MSB
10-bit Pressure ADC output value MSB
0x01
Padc_LSB
10-bit Pressure ADC output value LSB
0x02
Tadc_MSB
10-bit Temperature ADC output value MSB
0x03
Tacd_LSB
10-bit Temperature ADC output value LSB
0x04
a0_MSB
a0 coefficient MSB
0x05
a0_LSB
a0 coefficient LSB
0x06
b1_MSB
b1 coefficient MSB
0x07
b1_LSB
b1 coefficient LSB
0x08
b2_MSB
b2 coefficient MSB
0x09
b2_LSB
b2 coefficient LSB
0x0A
c12_MSB
c12 coefficient MSB
0x0B
c12_LSB
c12 coefficient LSB
0x0C
Reserved*
—
0x0D
Reserved*
—
0x0E
Reserved*
—
0x0F
Reserved*
—
0x10
Reserved
—
0x11
Reserved
—
0x12
CONVERT
Start Pressure and Temperature Conversion
*These registers are set to 0x00. These are reserved, and were previously utilized as Coefficient values, c11 and c22, which
were always 0x00.
For values with less than 16 bits, the lower LSBs are zero. For example, c12 is 14 bits and is stored into 2 bytes as follows:
c12 MS byte = c12[13:6] = [c12b13 , c12b12 , c12b11 , c12b10 , c12b9 , c12b8 , c12b7 , c12b6]
c12 LS byte = c12[5:0] & “00” = [c12b5 , c12b4 , c12b3 , c12b2 , c12b1 , c12b0 , 0 , 0]
3.1 Pressure, Temperature and Coefficient Bit-Width Specifications
The table below specifies the initial coefficient bit-width specifications for the compensation algorithm and the specifications for
Pressure and Temperature ADC values.
Total Bits
Sign Bits
Integer Bits
Fractional Bits
dec pt zero pad
Pressure, Temperature and Compensation Coefficient Specifications
a0
b1
b2
c12
Padc
16
16
16
14
10
1
1
1
1
0
12
2
1
0
10
3
13
14
13
0
0
0
0
9
0
Tadc
10
0
10
0
0
Sensors
Freescale Semiconductor, Inc.
MPL115A1
5
Share Link: 