How to Interpret DS1847/DS1848

How to Interpret DS1847/DS1848 Temperature Readings

Abstract: The DS1847 and DS1848 have an on-chip direct-to-digital temperature sensor. The temperature is stored in address locations E2h and E3h. This application note explains how to convert the digital temperature data into a decimal degrees Celsius value.

Translating Temperatures from Hex to Decimal

The procedure for converting temperature values for the DS1847 and DS1848 begins with reading the hex values stored in bytes E2h (the MSB of the temperature) and E3h (the LSB of the temperature). These two bytes contain the most recent temperature reading. Once the two bytes have been read, they can be translated into binary. The bit weights are shown in Table 1.

Table 1. Bit weight from page 5 of the DS1847 and DS1848 data sheets

E2h (Temperature MSB)								E3h (Temperature LSB)
S	27	26	25	24	23	22	21	20	2-1	2-2	2-3	2-4	0	0	0

The temperature is stored in the 13 MSBs of the binary data. The MSB is the sign bit and indicates whether or not the 2's complement binary number is positive or negative. If the MSB is 0, then the value is positive. If the MSB is 1, then the value is negative. The next 12 bits contain the value of the temperature and are translated into decimal by different methods for positive and negative values.

Positive Temperature Translation

The following is an example of how to translate a positive temperature. In this example, address locations E2h and E3h contain 2Ah and 88h, respectively. Combine these two bytes to get 2A88h. Next, translate the hex data into binary. The binary equivalent of 2A88h is 0010 1010 1000 1000. Since the MSB is 0, the temperature is positive. The lower 3 bits of the binary data are ignored, so they are masked with 0s. Table 2 shows the translation from hex to binary and the masking of the lower 3 bits.

Table 2. Positive number (MSB = 0) translation

HEXIDECIMAL DATA	BINARY DATA	MASKED BINARY DATA
2A88h	0010 1010 1000 1000	0010 1010 1000 1000

Because the temperature is positive, no 2's complement transformation is required. The data can be translated directly into a decimal number using a calculator. The binary number 0010 1010 1000 1000 is equal to the decimal value of 10888. Because the data contains a fractional component, the decimal value has to be divided to attain the true temperature. The decimal value must be divided by 128 (or multiplied by 2-7) to calculate the correct decimal temperature value. Dividing the decimal value 10888 by 128 results in a decimal temperature value of 85.0625°C.

Negative Temperature Translation

Converting a negative temperature value (MSB = 1) is a little more involved. As an example, addresses E2h and E3h contain the data F8h and 08h. The first step would be to convert the hex values into binary. Again, the lower 3 bits are ignored, so they will be masked with 0s. Table 3 shows the translation from hex to binary and the masking of the 3 lower bits.

Table 3. Negative number (MSB = 1) translation

HEXIDECIMAL DATA	BINARY DATA	MASKED BINARY DATA
F808h	1111 1000 0000 1000	1111 1000 0000 1000

The next step is to take the 2's complement of the masked binary value. This is done by first inverting the masked binary number, then adding 1 to it. Inverting the binary number 1111 1000 0000 1000 results in the binary number 0000 0111 1111 0111. Adding 1 gives the binary number 0000 0111 1111 1000. This value is equal to the decimal number 2040. Like in the positive temperature example, the translated decimal value is divided by 128, but is also made negative because the temperature is negative as indicated by the MSB. So, when the decimal value 2040 is divided by -128, the result is a decimal temperature value of -15.9375°C.

Conclusion

This application note demonstrates the two methods of translating the hex data found in addresses E2h and E3h into a decimal degrees Celsius temperature value. Any questions about this document can be directed to the Mixed-Signal Applications Group at MixedSignal.Apps@dalsemi.com.

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DS1847B-010+T&R 數(shù)據(jù)采集 - 數(shù)字電位器

電子發(fā)燒友網為你提供Maxim(Maxim)DS1847B-010+T&R相關產品參數(shù)、數(shù)據(jù)手冊，更有DS1847B-010+T&R的引腳圖、接線圖、封裝手冊、中文資料、英文資料，DS1847B-010+T&R真值表，DS1847B-010+T&R管腳等資料，希望可以幫助到廣大的電子工程師們。

2023-01-22 18:59:39

DS1848B-010+T&R 數(shù)據(jù)采集 - 數(shù)字電位器

電子發(fā)燒友網為你提供Maxim(Maxim)DS1848B-010+T&R相關產品參數(shù)、數(shù)據(jù)手冊，更有DS1848B-010+T&R的引腳圖、接線圖、封裝手冊、中文資料、英文資料，DS1848B-010+T&R真值表，DS1848B-010+T&R管腳等資料，希望可以幫助到廣大的電子工程師們。

2023-01-22 19:06:58

DS1847E-010/T&R 數(shù)據(jù)采集 - 數(shù)字電位器

電子發(fā)燒友網為你提供Maxim(Maxim)DS1847E-010/T&R相關產品參數(shù)、數(shù)據(jù)手冊，更有DS1847E-010/T&R的引腳圖、接線圖、封裝手冊、中文資料、英文資料

2023-01-22 19:48:57

DS1848B-010/T&R 數(shù)據(jù)采集 - 數(shù)字電位器

電子發(fā)燒友網為你提供Maxim(Maxim)DS1848B-010/T&R相關產品參數(shù)、數(shù)據(jù)手冊，更有DS1848B-010/T&R的引腳圖、接線圖、封裝手冊、中文資料、英文資料

2023-01-22 19:49:24

DS1848B-050/T&R 數(shù)據(jù)采集 - 數(shù)字電位器

電子發(fā)燒友網為你提供Maxim(Maxim)DS1848B-050/T&R相關產品參數(shù)、數(shù)據(jù)手冊，更有DS1848B-050/T&R的引腳圖、接線圖、封裝手冊、中文資料、英文資料

2023-01-22 19:49:51

DS1847B-050+ 數(shù)據(jù)采集 - 數(shù)字電位器

電子發(fā)燒友網為你提供Maxim(Maxim)DS1847B-050+相關產品參數(shù)、數(shù)據(jù)手冊，更有DS1847B-050+的引腳圖、接線圖、封裝手冊、中文資料、英文資料，DS1847B-050+真值表，DS1847B-050+管腳等資料，希望可以幫助到廣大的電子工程師們。

2023-01-22 20:07:32

DS1847E-050+T&R 數(shù)據(jù)采集 - 數(shù)字電位器

電子發(fā)燒友網為你提供Maxim(Maxim)DS1847E-050+T&R相關產品參數(shù)、數(shù)據(jù)手冊，更有DS1847E-050+T&R的引腳圖、接線圖、封裝手冊、中文資料、英文資料，DS1847E-050+T&R真值表，DS1847E-050+T&R管腳等資料，希望可以幫助到廣大的電子工程師們。

2023-01-22 20:11:01

DS1848B-C10+ 數(shù)據(jù)采集 - 數(shù)字電位器

電子發(fā)燒友網為你提供Maxim(Maxim)DS1848B-C10+相關產品參數(shù)、數(shù)據(jù)手冊，更有DS1848B-C10+的引腳圖、接線圖、封裝手冊、中文資料、英文資料，DS1848B-C10+真值表，DS1848B-C10+管腳等資料，希望可以幫助到廣大的電子工程師們。

2023-01-23 18:01:48

DS1848B-C10+T&R 數(shù)據(jù)采集 - 數(shù)字電位器

電子發(fā)燒友網為你提供Maxim(Maxim)DS1848B-C10+T&R相關產品參數(shù)、數(shù)據(jù)手冊，更有DS1848B-C10+T&R的引腳圖、接線圖、封裝手冊、中文資料、英文資料，DS1848B-C10+T&R真值表，DS1848B-C10+T&R管腳等資料，希望可以幫助到廣大的電子工程師們。

2023-01-23 18:15:01

DS1848B-C50+T&R 數(shù)據(jù)采集 - 數(shù)字電位器

電子發(fā)燒友網為你提供Maxim(Maxim)DS1848B-C50+T&R相關產品參數(shù)、數(shù)據(jù)手冊，更有DS1848B-C50+T&R的引腳圖、接線圖、封裝手冊、中文資料、英文資料，DS1848B-C50+T&R真值表，DS1848B-C50+T&R管腳等資料，希望可以幫助到廣大的電子工程師們。

2023-01-23 18:15:11

再生DS1847/DS1848電阻校準常數(shù)

本應用筆記旨在說明如何再生DS1847/48數(shù)字電阻校準常數(shù)。本應用筆記假設讀者熟悉DS1847或DS1848數(shù)據(jù)資料中的查找表編程部分。本應用筆記將描述所需的測量，并顯示重新生成校準常數(shù)所需的計算

2023-02-25 12:05:06

434

面向工業(yè)控制的DS1847介紹

本應用筆記向工業(yè)控制市場介紹雙通道數(shù)字溫控可變電阻DS1847和DS1848。通過對電阻進行溫度補償，電阻器可以保持在特定的電阻，也可以通過每2°C設置一個唯一的電阻值來隨溫度變化。 DS1847

2023-02-25 12:06:29

575

再生DS1847/DS1848電阻校準常數(shù)

2023-03-13 10:34:54

414

DS1847/DS1848 溫度系數(shù)補充

DS1847和DS1848均具有兩個256位數(shù)字電阻和查找表（LUT），可在-40°C至95°C的溫度范圍內自動調節(jié)電阻。 DS1848還具有128字節(jié)的用戶EEPROM，用于非易失性（NV）存儲

2023-05-17 11:39:20

404

DS1847/DS1848查找表的考慮因素

DS1847和DS1848為數(shù)字控制電阻。這些部件中的查找表用于存儲電阻位置可分立補償用戶在范圍為 -40°C 至 +102°C，增量為 2°C。每個芯片提供兩個這樣的表，一個用于電阻0（表1 數(shù)據(jù)手冊中）和一個電阻1（數(shù)據(jù)手冊中的表2）。它們可以通過表選擇字節(jié)進行選擇位于地址 E0。

2023-06-09 16:26:13

329