Datasheet LTC2983 (Analog Devices) - 66
| Hersteller | Analog Devices |
| Beschreibung | Multi-Sensor High Accuracy Digital Temperature Measurement System |
| Seiten / Seite | 72 / 66 — CUSTOM THERMISTORS. Table 77. NTC Thermistor Example Resistance vs Kelvin … |
| Dateiformat / Größe | PDF / 790 Kb |
| Dokumentensprache | Englisch |
CUSTOM THERMISTORS. Table 77. NTC Thermistor Example Resistance vs Kelvin Data Memory Map POINT. SENSOR OUTPUT TEMPERATURE
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LTC2983
CUSTOM THERMISTORS
Custom thermistor table data is formatted in Ω (sensor Table 78, where the first 20 bits are the integer part and output resistance) vs Kelvin (see Table 77). Each table the remaining four bits are the fractional part. entry pair spans six bytes. The first set of data can begin at any memory location greater than or equal to 0x250 In order to simplify the temperature field, temperature and end below 0x3CF. values are input in Kelvin as an unsigned value, but the final temperatures reported by the LTC2983 are reported In order to program the LTC2983 with the custom therm- in °C or °F. The sensor temperature (Kelvin) follows the istor table, both the resistance data and the Kelvin data convention shown in Table 79, where the first 14 bits are converted to 24-bit binary values. The sensor output are the integer part and the remaining 10 bits are the resistance (units=Ω) follows the convention shown in fractional part.
Table 77. NTC Thermistor Example Resistance vs Kelvin Data Memory Map POINT SENSOR OUTPUT TEMPERATURE START STOP BYTE 1 BYTE 2 BYTE 3 BYTE 1 BYTE 2 BYTE 3 RESISTANCE(Ω) (K) ADDRESS ADDRESS
P0 0 457.5 0x2C8 0x2CD P1 80 400.2 0x2CE 0x2D3 P2 184 372.3 0x2D4 0x2D9 P3 423.2 320.1 0x2DA 0x2DF P4 973.36 290.55 0x2E0 0x2E5 Resistance Data Temperature Data P5 2238.728 249.32 0x2E6 0x2EB P6 5149.0744 240.3 0x2EC 0x2F1 P7 26775.18688 230 0x2F2 0x2F7 P8 139230.9718 215.3 0x2F8 0x2FD P9 724001.0532 200 0x2FE 0x303
Table 78. Example Thermistor Resistance Values BYTE 1 BYTE 2 BYTE 3
B23 B22 B21 B20 B19 B18 B17 B16 B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 Resistance 219 218 217 216 215 214 213 212 211 210 29 28 27 26 25 24 23 22 21 20 2–1 2–2 2–3 2–4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 80 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 184 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 1 0 0 0 0 0 0 0 423.2 0 0 0 0 0 0 0 0 0 0 0 1 1 0 1 0 0 1 1 1 0 0 1 1 973.36 0 0 0 0 0 0 0 0 0 0 1 1 1 1 0 0 1 1 0 1 0 1 0 1 2238.728 0 0 0 0 0 0 0 0 1 0 0 0 1 0 1 1 1 1 1 0 1 0 1 1 5149.074 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 1 1 1 0 1 0 0 0 1 26775.19 0 0 0 0 0 1 1 0 1 0 0 0 1 0 0 1 0 1 1 1 0 0 1 1 139231 0 0 1 0 0 0 0 1 1 1 1 1 1 1 0 1 1 1 1 1 0 0 0 0 724001.1 1 0 1 1 0 0 0 0 1 1 0 0 0 0 1 0 0 0 0 1 0 0 0 1 2983fc 66 For more information www.linear.com/LTC2983 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Complete System Electrical Characteristics Pin Configuration ADC Electrical Characteristics Reference Electrical Characteristics Digital Inputs and Digital Outputs Typical Performance Characteristics Pin Functions Block Diagram Test Circuits Timing Diagram Overview Applications Information Thermocouple Measurements Diode Measurements RTD Measurements Thermistor Measurements Direct ADC Measurements Supplemental Information Fault Protection and Anti-Aliasing 2- and 3-Cycle Conversion Modes Running Conversions Consecutively on Multiple Channels MUX Configuration Delay Global Configuration Register Custom Thermocouples Custom RTDs Custom Thermistors Package Description Revision History Typical Application Related Parts
CUSTOM THERMISTORS
Custom thermistor table data is formatted in Ω (sensor Table 78, where the first 20 bits are the integer part and output resistance) vs Kelvin (see Table 77). Each table the remaining four bits are the fractional part. entry pair spans six bytes. The first set of data can begin at any memory location greater than or equal to 0x250 In order to simplify the temperature field, temperature and end below 0x3CF. values are input in Kelvin as an unsigned value, but the final temperatures reported by the LTC2983 are reported In order to program the LTC2983 with the custom therm- in °C or °F. The sensor temperature (Kelvin) follows the istor table, both the resistance data and the Kelvin data convention shown in Table 79, where the first 14 bits are converted to 24-bit binary values. The sensor output are the integer part and the remaining 10 bits are the resistance (units=Ω) follows the convention shown in fractional part.
Table 77. NTC Thermistor Example Resistance vs Kelvin Data Memory Map POINT SENSOR OUTPUT TEMPERATURE START STOP BYTE 1 BYTE 2 BYTE 3 BYTE 1 BYTE 2 BYTE 3 RESISTANCE(Ω) (K) ADDRESS ADDRESS
P0 0 457.5 0x2C8 0x2CD P1 80 400.2 0x2CE 0x2D3 P2 184 372.3 0x2D4 0x2D9 P3 423.2 320.1 0x2DA 0x2DF P4 973.36 290.55 0x2E0 0x2E5 Resistance Data Temperature Data P5 2238.728 249.32 0x2E6 0x2EB P6 5149.0744 240.3 0x2EC 0x2F1 P7 26775.18688 230 0x2F2 0x2F7 P8 139230.9718 215.3 0x2F8 0x2FD P9 724001.0532 200 0x2FE 0x303
Table 78. Example Thermistor Resistance Values BYTE 1 BYTE 2 BYTE 3
B23 B22 B21 B20 B19 B18 B17 B16 B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 Resistance 219 218 217 216 215 214 213 212 211 210 29 28 27 26 25 24 23 22 21 20 2–1 2–2 2–3 2–4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 80 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 184 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 1 0 0 0 0 0 0 0 423.2 0 0 0 0 0 0 0 0 0 0 0 1 1 0 1 0 0 1 1 1 0 0 1 1 973.36 0 0 0 0 0 0 0 0 0 0 1 1 1 1 0 0 1 1 0 1 0 1 0 1 2238.728 0 0 0 0 0 0 0 0 1 0 0 0 1 0 1 1 1 1 1 0 1 0 1 1 5149.074 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 1 1 1 0 1 0 0 0 1 26775.19 0 0 0 0 0 1 1 0 1 0 0 0 1 0 0 1 0 1 1 1 0 0 1 1 139231 0 0 1 0 0 0 0 1 1 1 1 1 1 1 0 1 1 1 1 1 0 0 0 0 724001.1 1 0 1 1 0 0 0 0 1 1 0 0 0 0 1 0 0 0 0 1 0 0 0 1 2983fc 66 For more information www.linear.com/LTC2983 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Complete System Electrical Characteristics Pin Configuration ADC Electrical Characteristics Reference Electrical Characteristics Digital Inputs and Digital Outputs Typical Performance Characteristics Pin Functions Block Diagram Test Circuits Timing Diagram Overview Applications Information Thermocouple Measurements Diode Measurements RTD Measurements Thermistor Measurements Direct ADC Measurements Supplemental Information Fault Protection and Anti-Aliasing 2- and 3-Cycle Conversion Modes Running Conversions Consecutively on Multiple Channels MUX Configuration Delay Global Configuration Register Custom Thermocouples Custom RTDs Custom Thermistors Package Description Revision History Typical Application Related Parts