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RF31 参数 Datasheet PDF下载

RF31图片预览
型号: RF31
PDF下载: 下载PDF文件 查看货源
内容描述: ISM接收器 [ISM Receiver]
分类和应用: ISM频段
文件页数/大小: 139 页 / 3458 K
品牌: HOPERF [ HOPERF ]
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RF31  
8.4. Temperature Sensor  
An analog temperature sensor is integrated into the chip. The temperature sensor will be automatically enabled  
when the temperature sensor is selected as the input of the ADC or when the analog temp voltage is selected on  
the analog test bus. The temperature sensor value may be digitized using the general-purpose ADC and read out  
over the SPI through "Register 10h. ADC Sensor Amplifier Offset". The range of the temperature sensor is  
selectable to configure to the desired application and performance. The table below demonstrates the settings for  
the different temperature ranges and performance.  
To use the Temp Sensor:  
1. Set input for ADC to be Temperature Sensor, "Register 0Fh. ADC Configuration"adcsel[2:0] = 000  
2. Set Reference for ADC, "Register 0Fh. ADC Configuration"adcref[1:0] = 00  
3. Set Temperature Range for ADC, "Register 12h. Temperature Sensor Calibration"tsrange[1:0]  
4. Set entsoffs = 1, "Register 12h. Temperature Sensor Calibration"  
5. Trigger ADC Reading, "Register 0Fh. ADC Configuration"adcstart = 1  
6. Read-out ValueRead Address in "Register 11h. ADC Value"  
POR  
Def.  
Function/Descr  
iption  
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
Add R/W  
Temperature  
Sensor Control  
Temperature  
Value Offset  
tsrange[1]  
tvoffs[7]  
tsrange[0]  
tvoffs[6]  
entsoffs  
tvoffs[5]  
entstrim  
tvoffs[4]  
vbgtrim[3]  
tvoffs[3]  
vbgtrim[2]  
tvoffs[2]  
vbgtrim[1]  
tvoffs[1]  
vbgtrim[0]  
tvoffs[0]  
R/W  
20h  
00h  
12  
R/W  
13  
Table 22. Temperature Sensor Range  
entoff tsrange[1]  
tsrange[0]  
Temp. range  
–64 … 64  
–64 … 192  
0 … 128  
Unit  
°C  
°C  
°C  
°F  
Slope  
ADC8 LSB  
0.5 °C  
1 °C  
1
1
0
0
1
1
1
0
1
0
1
0
8 mV/°C  
4 mV/°C  
8 mV/°C  
4 mV/°F  
3 mV/°K  
1
0.5 °C  
1 °F  
1
–40 … 216  
0 … 341  
0*  
°K  
1.333 °K  
*Note: Absolute temperature mode, no temperature shift. This mode is only for test purposes. POR value of  
EN_TOFF is 1.  
Control to adjust the temperature sensor accuracy is available by adjusting the bandgap voltage. By enabling the  
envbgcal and using the vbgcal[3:0] bits to trim the bandgap the temperature sensor accuracy may be fine tuned in  
the final application. The slope of the temperature sensor is very linear and monotonic but the exact accuracy or  
offset in temperature is difficult to control better than ±10 °C. With the vbgtrim or bandgap trim though the initial  
temperature offset can be easily adjusted and be better than ±3 °C.  
The different ranges for the temperature sensor and ADC8 are demonstrated in Figure 21. The value of the ADC8  
may be translated to a temperature reading by ADC8Value x ADC8 LSB + Lowest Temperature in Temp Range.  
For instance for a tsrange = 00, Temp = ADC8Value x 0.5 64.  
48  
Tel: +86-755-82973805  
Fax: +86-755-82973550  
E-mail: sales@hoperf.com  
http://www.hoperf.com  
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