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参数资料
| 型号： | APGRD003 |
| 厂商： | Microchip Technology |
| 文件页数： | 23/42页 |
| 文件大小： | 0K |
| 描述： | KIT TPMS REFERENCE DESIGN |
| 标准包装： | 1 |
| 类型： | 汽车 - 轮胎压力监视器 |
| 频率： | 433.92MHz |
| 适用于相关产品： | PIC18F4680，PIC18F2680，MCP2030 |
| 已供物品： | 基站、低频起始器板和轮胎压力传感器节点 |
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Hardware Overview
Note:
3.4.3.7
This method of the temperature measurement is not the most accurate way
to monitor the temperature. An external temperature sensor should be
used, if high accuracy is desired.
BATTERY MEASUREMENT
? The battery measurement is implemented by comparing the difference between
the constant forward voltage drop of a diode (D3) with the battery voltage level
using the internal ADC in the microcontroller. Pin RC1 is set up as the input to
ADC for battery measurement. A threshold value of 2.3V is selected to ensure the
proper operation of the internal ADC. The Battery Low flag will be set if the battery
falls below the threshold value.
Note:
The internal ADC minimum required Vref voltage is 2.2V. In order to
achieve the 1LSB accuracy, Vref voltage value of 2.7V or higher is required.
3.5
ANALOG SENSOR CALIBRATION
The calibration method recommended by Intersema for the optimal sensor
performance is the 4-point calibration routine using the simple linear sensor model
described in the Intersema application note (AN402). Total of four independent mea-
surements performed at two different temperatures and pressures are used to calcu-
late and compensate for the variations in the performance of the sensor due to process
variations. Refer to Application Note AN402 from Intersema for more details regarding
analog sensor calibration methods.
Note:
This reference design provides only the typical calibration values used
during development and the calibration values will vary from unit to unit.
Therefore, the accuracy of the measurements is not guaranteed. The user
is responsible for performing the calibration routine for their applications.
Please contact sensor manufacturing for additional information regarding
this topic.
3.6
SENSOR CALIBRATION
The multiplication and division subroutines used in the sensor calibration/compensa-
tion routine are derived from the math subroutines described in Microchip’s Application
Note AN617, “Fixed Point Routines” . Refer to this application note for more descrip-
tions on the 16x16 bits multiplication and 32/16 bits division routines. The flow charts
for the addition routine (Figure 3-6) and subtraction routine (Figure 3-7) are included
for references.
? 2006 Microchip Technology Inc.
DS51624B-page 19
相关PDF资料 |
PDF描述 |
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| APR 400 B420L | SENSOR CURRENT 40A 24V MOD |
| APT1608F3C | EMITTER IR 1.6X0.8 940NM CLR SMD |
| APT1608SF4C-PRV | LED IR 880NM SF4 1.6X0.8MM SMD |
| APT2012F3C | EMITTER IR 2X1.2MM 940NM CLR SMD |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| APGRD004 | 功能描述:开发板和工具包 - PIC / DSPIC Auto Ambient Lighting Module RoHS:否 制造商:Microchip Technology 产品:Starter Kits 工具用于评估:chipKIT 核心:Uno32 接口类型: 工作电源电压: |
| APGSABA | 制造商:OMRON AUTOMATION AND SAFETY 功能描述:CUSTOM SHUTTER ASSEMBLY 制造商:OMRON Industrial Automation 功能描述:CUSTOM SHUTTER ASSEMBLY |
| APG-SA-BA | 制造商:OMRON AUTOMATION AND SAFETY 功能描述:CUSTOM SHUTTER ASSEMBLY 制造商:OMRON Industrial Automation 功能描述:CUSTOM SHUTTER ASSEMBLY 制造商:Omron Corporation 功能描述:Custom Shutter Assembly 制造商:OMRON INDUSTRIAL AUTOMATION 功能描述:Custom Shutter Assembly |
| AP-GT1-1P-2428/1.6C(90) | 制造商:Hirose 功能描述:AP-GT1-1P-2428/1.6C(90) |
| APGT1-1P-2428/1.6C(91 | 制造商:Hirose 功能描述:APGT1-1P-2428/1.6C(91 |
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