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DS1856E-002R Datasheet(PDF) 11 Page - Maxim Integrated Products |
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DS1856E-002R Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 31 page Dual, Temperature-Controlled Resistors with Inter- nally Calibrated Monitors and Password Protection ____________________________________________________________________ 11 Variable Resistors The value of each variable resistor is determined by a temperature-addressed look-up table, which can assign a unique value (00h to FFh) to each resistor for every 2°C increment over the -40°C to +102°C range (see Table 3). See the Temperature Conversion section for more information. The variable resistors can also be used in manual mode. If the TEN bit equals 0, the resistors are in man- ual mode and the temperature indexing is disabled. The user sets the resistors in manual mode by writing to addresses 82h and 83h in Table 03 to control resis- tors 0 and 1, respectively. Memory Description The memory of the DS1856 is divided into two areas referred to as the Main Device and the Auxiliary Device. The Main Device comprises all of the DS1856 specific memory while the Auxiliary Device consists of 128 bytes of general-purpose EEPROM and is espe- cially useful in GBIC applications. Main and Auxiliary ADEN (ADDRESS ENABLE) NO. OF SEPARATE DEVICE ADDRESSES ADDITIONAL INFORMATION 02 See Figure 2 1 1 (Main Device Only) See Figure 3 Table 4. ADEN Address Configuration ADEN ADFIX AUXILIARY ADDRESS MAIN ADDRESS 00 A0h A2h 01 A0h EEPROM (Table 03, 8Ch) 10 — A2h 11 — EEPROM (Table 03, 8Ch) Table 5. ADEN and ADFIX Bits AUXILIARY DEVICE EEPROM AUXILIARY MEMORY (128 BYTES) 00h 7Fh 127 7F 127 7F 128 80 183 B7 199 C7 200 C8 255 FF 2-WIRE ADDRRESS A0h DEC HEX 00 MAIN DEVICE LOWER MEMORY TABLE SELECT BYTE PASSWORD ENTRY (PWE) (4 BYTES) 00h 7Fh 2-WIRE ADDRESS A2h (DEFAULT) NOTE 1: ADEN BIT = 0. AUXILIARY MEMORY IS ADDRESSED USING THE AUXILIARY DEVICE NOTE 1. 2-WIRE SLAVE ADDRESS OF A0h, AND THE REMAINDER OF THE MEMORY IS NOTE 1. ADDRESSED USING THE MAIN DEVICE 2-WIRE SLAVE ADDRESS OF A2h NOTE 1. (WHEN ADFIX = 0). NOTE 2: TABLES 00h, 01h, AND 02h DO NOT EXIST. DEC HEX 00 TABLE 03h CONFIGURATION TABLE 80h B7h TABLE 04h RESISTOR 0 LOOK-UP TABLE (72 BYTES) 80h C7h TABLE 05h RESISTOR 1 LOOK-UP TABLE (72 BYTES) 80h C7h RESERVED AND CALIBRATION CONSTANTS RESERVED AND CALIBRATION CONSTANTS F0h FFh F0h FFh Figure 2. Memory Organization, ADEN = 0 |
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