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TMP411-Q1 Datasheet(PDF) 19 Page - Texas Instruments |
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TMP411-Q1 Datasheet(HTML) 19 Page - Texas Instruments |
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19 / 40 page  300 1.008 =300 ( ) ADJUST eff N n - g 1.008 300 = (300 ) eff ADJUST n N - g 2 2 1 1 ln( ) BE BE nkT I V V q I - = TMP411-Q1 www.ti.com SBOS527F – DECEMBER 2010 – REVISED NOVEMBER 2013 N-FACTOR CORRECTION REGISTER The n-correction value must be stored in twos- complement format, yielding an effective data range The TMP411-Q1 allows for a different n-factor value from −128 to 127, as shown in Table 9. The n- to be used for converting remote-channel correction value may be written to and read from measurements to temperature. The remote channel pointer address 18h. The register power-on-reset uses sequential current excitation to extract a value is 00h, thus having no effect unless written to. differential VBE voltage measurement to determine the temperature of the remote transistor. Equation 1 Table 9. N-Factor Range relates this voltage and temperature. NADJUST N BINARY HEX DECIMAL (1) 0111 1111 7F 127 1.747977 0000 1010 0A 10 1.042759 The value n in Equation 1 is a characteristic of the particular transistor used for the remote channel. The 0000 1000 08 8 1.035616 default value for the TMP411-Q1 is n = 1.008. The 0000 0110 06 6 1.028571 value in the N-Factor Correction Register may be 0000 0100 04 4 1.021622 used to adjust the effective n-factor according to 0000 0010 02 2 1.014765 Equation 2 and Equation 3. 0000 0001 01 1 1.011371 0000 0000 00 0 1.008 (2) 1111 1111 FF −1 1.004651 1111 1110 FE −2 1.001325 1111 1100 FC −4 0.994737 (3) 1111 1010 FA −6 0.988235 1111 1000 F8 −8 0.981818 1111 0110 F6 −10 0.975484 1000 0000 80 −128 0.706542 MINIMUM AND MAXIMUM REGISTERS The TMP411-Q1 stores the minimum and maximum temperature measured since power on, chip reset, or minimum and maximum register reset for both the local and remote channels. The Local Temperature Minimum Register may be read by reading the high byte from pointer address 30h and the low byte from pointer address 31h. The Local Temperature Minimum Register may also be read by using a two-byte read command from pointer address 30h. The Local Temperature Minimum Register is reset at power on, by executing the chip-reset command, or by writing any value to any of pointer addresses 30h through 37h. The reset value for these registers is FFh/F0h. The Local Temperature Maximum Register may be read by reading the high byte from pointer address 32h and the low byte from pointer address 33h. The Local Temperature Maximum Register may also be read by using a two-byte read command from pointer address 32h. The Local Temperature Maximum Register is reset at power on by executing the chip reset command, or by writing any value to any of pointer addresses 30h through 37h. The reset value for these registers is 00h/00h. The Remote Temperature Minimum Register may be read by reading the high byte from pointer address 34h and the low byte from pointer address 35h. The Remote Temperature Minimum Register may also be read by using a two-byte read command from pointer address 34h. The Remote Temperature Minimum Register is reset at power on by executing the chip reset command, or by writing any value to any of pointer addresses 30h through 37h. The reset value for these registers is FFh/F0h. The Remote Temperature Maximum Register may be read by reading the high byte from pointer address 36h and the low byte from pointer address 37h. The Remote Temperature Maximum Register may also be read by using a two-byte read command from pointer address 36h. The Remote Temperature Maximum Register is reset at power on by executing the chip reset command, or by writing any value to any of pointer addresses 30h through 37h. The reset value for these registers is 00h/00h. Copyright © 2010–2013, Texas Instruments Incorporated Submit Documentation Feedback 19 Product Folder Links: TMP411-Q1 |
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