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71M6533H-IGTR/F 参数 Datasheet PDF下载

71M6533H-IGTR/F图片预览
型号: 71M6533H-IGTR/F
PDF下载: 下载PDF文件 查看货源
内容描述: 电能计量IC [Energy Meter IC]
分类和应用:
文件页数/大小: 124 页 / 1997 K
品牌: TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
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71M6533/71M6534 Data Sheet  
FDS_6533_6534_004  
Only partial trim fuse information is available for non-H parts. The values for PPMC and PPMC2 that are  
used by the CE to implement temperature compensation are calculated as follows:  
PPMC = TC1 * 22.46 = (52.46 - TRIMT) * 3.18 * 22.46 = (52.46 - TRIMT) * 71.423  
PPMC2 = TC2 * 1150.1 = –0.444 * 1150.1 = -510.6  
The factor TRIMT used to calculate PPMC is derived from the trim fuse TRIMT[7:0].  
3.3 Connecting 5 V Devices  
All digital input pins of the 71M6533/71M6534 are compatible with external 5 V devices. I/O pins confi-  
gured as inputs do not require current-limiting resistors when they are connected to external 5 V devices.  
3.4 Temperature Measurement  
Measurement of absolute temperature uses the on-chip temperature sensor and applying the following  
formula:  
(N(T) Nn )  
T =  
+Tn  
Sn  
In the above formula T is the temperature in °C, N(T) is the ADC count at temperature T, Nn is the ADC  
count at 25°C, Sn is the sensitivity in LSB/°C as stated in the Electrical Specifications, and Tn is +25 °C.  
Example: At 25°C a temperature sensor value of 483,203,000 (Nn) is read by the ADC. At an unknown  
temperature T the value 449.648.000 is read at (N(T)). We determine the absolute temperature by divid-  
ing the difference of Nn and N(T) by 512 times the slope factor (-1180). After that, we add the 25C from  
the reference measurement:  
449.648.000 - 483,203,000  
T =  
+ 25C = 80.5C  
512(1180)  
The divisor 512 accounts for the 8-bit shift of the ADC value and for the factor of 2 introduced into the  
measurement by the CE which adds two consecutive temperature readings. It is recommended that tem-  
perature measurements be based on TEMP_RAW_X which is the sum of two consecutive temperature  
readings, thus being higher by a factor of two than the raw sensor readings.  
3.5 Temperature Compensation  
In a typical application, the CE compensates for the temperature dependency of the reference voltage  
(see Section 3.5.2). System-wide temperature correction over the entire meter is possible by involving  
the MPU. The thermal coefficients processed by the MPU may include the current sensors, the voltage  
sensors, and other influences.  
3.5.1 Temperature Coefficients  
For the 71M6533 and 71M6534, the temperature coefficient TC2 is given as a constant that represent  
typical component behavior (in µV/°C2). TC1 can be calculated for the individual chip from the contents of  
the TRIMT[7:0] I/O RAM register. TC1 and TC2 allow compensation for variations of the reference vol-  
tage to within ±40 PPM/°C.  
For the 71M6533H/71M6534H, individualized coefficients TC1 and TC2 can be retrieved from the on-chip  
fuses via TRIMBGA, TRIMBGB, TRIMM[2:0] (see Section 3.2 Distinction between 71M6533/71M6534 and  
71M6533H/71M6534H Parts). For this part, TC1 and TC2 allow compensation for variations of the refer-  
ence voltage to within ±15 PPM/°C  
66  
© 2007-2009 TERIDIAN Semiconductor Corporation  
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