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SS6782G Folha de dados(PDF) 13 Page - Silicon Standard Corp. |
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SS6782G Folha de dados(HTML) 13 Page - Silicon Standard Corp. |
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13 / 19 page ![]() www.SiliconStandard.com 13 of 19 SS6782G 9/21/2005 Rev.3.01 VBAT Rx C7 VCC Ry 5 VCC GND 16 ATS/BTS SS6 782G Fig. 15 Battery Temperature Sense Circuit with a Negative Temperature-Coefficient (NTC) Thermistor The calculation for Rx and Ry in the circuit is as follows: 0.29 Vcc Ry / /R Rx (Ry / / R ) Vcc TH TH = + × RTH= The resistance of thermistor at upper limit of temperature protection. Vcc ) R (Ry// Rx Ry//R Vcc 0.72 TL TH × + = RTL= The resistance of thermistor at lower limit of temperature protection. Substitution and rearranging the equations yields Rx= 2.061 TH TL TH TL R R R R − × × Ry = TH TL TH TL 6.3R R R R 5.3 − × × If the temperature characteristic of the thermistor is like that of the SEMITEC 103AT-2, the resis- tance of Rx and Ry is tabulated below for different values of TL and TH: (note: TL is the lower temperature limit and TH is the upper temperature limit.) 56 8.1 86.5 57 7.8 75.0 58 7.5 66.0 59 7.2 58.7 60 7.0 52.8 61 6.8 47.8 62 6.5 43.6 63 6.3 39.9 64 6.1 36.8 65 5.9 34.0 66 5.7 31.6 67 5.5 29.5 68 5.3 27.5 69 5.2 25.8 70 5.0 24.3 TABLE 3 Values of Rx and Ry at TL = 0°C TH ( °C) Rx(k Ω) Ry (k Ω) 50 10.1 551.1 51 9.7 300.7 52 9.4 204.8 53 9.0 153.9 54 8.7 122.8 55 8.4 101.8 TABLE 4 Values of Rx and Ry at TL = -10°C TH ( °C) Rx (k Ω) Ry (k Ω) 45 11.4 95.6 46 11.0 85.0 47 10.6 76.2 48 10.2 68.9 49 9.8 62.8 50 9.5 57.5 51 9.1 52.9 52 8.8 48.8 53 8.5 45.3 54 8.2 42.1 55 7.9 39.4 56 7.6 36.8 57 7.4 34.6 58 7.1 32.5 59 6.9 30.7 60 6.7 29.0 61 6.4 27.4 62 6.2 26.0 63 6.0 24.6 64 5.8 23.4 65 5.6 22.2 |
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