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SI1005 参数 Datasheet PDF下载

SI1005图片预览
型号: SI1005
PDF下载: 下载PDF文件 查看货源
内容描述: 超低功耗, 64/32 KB , 10位ADC, MCU ,集成了240-960兆赫的EZRadioPRO收发器 [Ultra Low Power, 64/32 kB, 10-Bit ADC MCU with Integrated 240-960 MHz EZRadioPRO Transceiver]
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文件页数/大小: 376 页 / 2369 K
品牌: SILICON [ SILICON ]
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Si1000/1/2/3/4/5  
5.6. Temperature Sensor  
An on-chip temperature sensor is included on the Si1000/1/2/3/4/5 which can be directly accessed via the  
ADC multiplexer in single-ended configuration. To use the ADC to measure the temperature sensor, the  
ADC mux channel should select the temperature sensor. The temperature sensor transfer function is  
shown in Figure 5.8. The output voltage (V  
) is the positive ADC input when the ADC multiplexer is set  
TEMP  
correctly. The TEMPE bit in register REF0CN enables/disables the temperature sensor, as described in  
SFR Definition 5.15. While disabled, the temperature sensor defaults to a high impedance state and any  
ADC measurements performed on the sensor will result in meaningless data. Refer to Table 4.9 for the  
slope and offset parameters of the temperature sensor.  
VTEMP = (Slope x TempC - 25) +Offset  
TempC = 25 + (VTEMP - Offset) / Slope  
Slope( V / deg C)  
Offset( V at 25 Celsius)  
Temperature  
Figure 5.8. Temperature Sensor Transfer Function  
5.6.1. Calibration  
The uncalibrated temperature sensor output is extremely linear and suitable for relative temperature mea-  
surements (see Table 4.10 for linearity specifications). For absolute temperature measurements, offset  
and/or gain calibration is recommended. Typically a 1-point (offset) calibration includes the following steps:  
1. Control/measure the ambient temperature (this temperature must be known).  
2. Power the device, and delay for a few seconds to allow for self-heating.  
3. Perform an ADC conversion with the temperature sensor selected as the positive input and GND  
selected as the negative input.  
4. Calculate the offset characteristics, and store this value in non-volatile memory for use with subsequent  
temperature sensor measurements.  
92  
Rev. 1.0