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参数资料
| 型号： | MPL115A2T2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 5/16页 |
| 文件大小： | 0K |
| 描述： | IC BAROMETER I2C DGTL MINI 8LGA |
| 标准包装： | 5,000 |
| 压力类型： | 绝对 |
| 工作压力： | 7.2 PSI ~ 16.6 PSI，50 ~ 115 kPa |
| 输出： | 数字 |
| 精确度： | ±1% |
| 电源电压： | 2.375 V ~ 5.5 V |
| 端接类型： | PCB |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 8-TLGA |
| 出厂设置： | * |
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 8 , 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
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
0x10
0x11
0x12
Name
Padc_MSB
Padc_LSB
Tadc_MSB
Tacd_LSB
a0_MSB
a0_LSB
b1_MSB
b1_LSB
b2_MSB
b2_LSB
c12_MSB
c12_LSB
Reserved*
Reserved*
Reserved*
Reserved*
Reserved
Reserved
CONVERT
Description
10-bit Pressure ADC output value MSB
10-bit Pressure ADC output value LSB
10-bit Temperature ADC output value MSB
10-bit Temperature ADC output value LSB
a0 coefficient MSB
a0 coefficient LSB
b1 coefficient MSB
b1 coefficient LSB
b2 coefficient MSB
b2 coefficient LSB
c12 coefficient MSB
c12 coefficient LSB
—
—
—
—
—
—
Start Pressure and Temperature Conversion
Size (bits)
8
2
8
2
8
8
8
8
8
8
8
8
—
—
—
—
—
—
—
*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] = [c12 b13 , c12 b12 , c12 b11 , c12 b10 , c12 b9 , c12 b8 , c12 b7 , c12 b6 ]
c12 LS byte = c12[5:0] & “00” = [c12 b5 , c12 b4 , c12 b3 , c12 b2 , c12 b1 , c12 b0 , 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.
Pressure, Temperature and Compensation Coefficient Specifications
a0
b1
b2
c12
Padc
Tadc
Total Bits
Sign Bits
Integer Bits
Fractional Bits
dec pt zero pad
16
1
12
3
0
16
1
2
13
0
16
1
1
14
0
14
1
0
13
9
10
0
10
0
0
10
0
10
0
0
MPL115A2
Sensors
Freescale Semiconductor, Inc.
5
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