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参数资料
| 型号： | TEMPCOMPRTC-RD |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 3/14页 |
| 文件大小： | 0K |
| 描述： | KIT REF DES TEMP COMPENS RTC |
| 标准包装： | 1 |
| 主要目的： | 计时，实时时钟（RTC） |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | C8051F300 |
| 主要属性： | I²C，RS-232，SMBus 接口 |
| 次要属性： | 需要 Keil 编译器和 USB 调试适配器 |
| 已供物品： | 板，线缆，CD，文档，电源 |
| 相关产品： | 336-1535-5-ND - IC 8051 MCU 8K FLASH 14-SOIC C8051F300-GMR-ND - IC 8051 MCU 8K FLASH 11QFN 336-1245-ND - IC 8051 MCU 8K FLASH 11QFN |
| 其它名称： | 336-1351 |
TEMPCOMPRTC-RD
4. TC-RTC Evaluation Board
The functions of the major components on the TC-RTC Evaluation Board that are labeled in Figure 1 are listed
below. The board schematic and bill of materials are shown in Sections 7 and 8, respectively.
C8051F300 MCU (U3)—Microcontroller with firmware to perform the TC-RTC function.
32.768 kHz Crystal (Y1)—This low-cost watch crystal is used for time keeping.
DB9 connector (J5)—This is for the serial RS-232 connection.
DB25 connector (J6)—This is for the optional parallel connection with SMBus interface.
In addition to these, a RS-232 transceiver and a buffer are used for the serial and SMBus interfaces, respectively.
5. TC-RTC Firmware
The clock accuracy of a time-keeping system based on a resonating quartz crystal is primarily affected by the
variation of crystal frequency with respect to temperature. Figure 2 shows a plot of the variation of crystal
frequency versus temperature. From the parabolic curve, it can be seen that the RTC will lose time if the
temperature is increased or decreased from the room temperature value (25 ° C). The RTC will never have a
positive error caused by temperature variations (i.e., gain time) because the maximum frequency is at room
temperature.
Figure 2. Crystal Frequency Variation Due to Temperature
The TC-RTC firmware running on the C8051F300 MCU eliminates this time loss because of temperature
variations. It uses the on-chip ADC and temperature sensor to measure the temperature every minute and
compensate for the lost time at the end of the day by adding the accumulated error to the RTC’s reported time.
This is explained in more detail in “AN293: Temperature Compensated Real Time Clock Reference Design
Programmer’s Guide”.
The time maintained by the TC-RTC can be accessed via two interfaces—a RS-232 serial interface via a DB9
connector and an SMBus interface via a DB25 connector. The preloaded firmware is built to work with the RS-232
serial interface. Also included in the AN293SW.zip package is a pre-built OMF file, which enables the SMBus
interface to the RTC when loaded into the device. The AN293SW.zip package contains the full source code as
well.
Rev. 0.1
3
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相关代理商/技术参数 |
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| TEMP-DEC | 制造商:Middle Atlantic Products 功能描述: |
| TEMPILSTIK294F | 制造商:未知厂家 制造商全称:未知厂家 功能描述:TEMPILSTIK294F |
| TEMPLATE TEST | 制造商:Delphi Corporation 功能描述:TEMPLATE TEST |
| TEMPMASTER-PRO | 制造商:Labfacility Limited 功能描述:THERMOMETER PRECISION PT100 制造商:LABFACILITY 功能描述:THERMOMETER, PRECISION, PT100 制造商:LABFACILITY 功能描述:THERMOMETER, PRECISION, PT100; Thermocouple Type:Pt100; Operating Temperature Max:20C; Accuracy:0.0005%; External Depth:250mm; External Length / Height:70mm; External Width:190mm; Interface Type:USB; No. of Inputs:2; ;RoHS Compliant: Yes |
| TEMP-PICO820-1.1GHZ | 制造商:Axiomtek Co Ltd 功能描述:NARKETING PROJECT DEMO BOARD ONLY - Bulk |
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