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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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RT5002 데이터시트(PDF) 30 Page - Richtek Technology Corporation |
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RT5002 데이터시트(HTML) 30 Page - Richtek Technology Corporation |
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30 / 40 page  RT5002 30 DS5002-00 November 2011 www.richtek.com Case 2 : TSSEL = H (For 10k Ω NTC) : Figure 2 0.6 x VP + - + - VP Too Cold Too Hot TS R1 R2 RNTC VP 0.38 x VP COLD COLD HOT HOT COLD HOT HOT COLD COLD COLD COLD R2 + R = 0.6 R +R1+R2 R2 + R = 0.38 R +R1+R2 Form (1), (2) RR R1 = 0.9 R2 = 0.6 R1R If R2 < 0 R = 0.6 R +R1 Form (3) R R1 = R 0.6 − ×− − Too Cold Temperature RCOLD = RNTC Too Hot Temperature RHOT = RNTC (1) (2) (3) Battery Pack Temperature Monitoring The battery pack temperature monitoring function can be realized by connecting the TS pin to an external Negative Temperature Coefficient (NTC) thermistor to prevent over temperature condition. Charging is suspended when the voltage at the TS pin is out of normal operating range. The internal timer is then paused, but the value is maintained. When the TS pin voltage returns back to normal operating range, charging will resume and the safe charge timer will continue to count down from the point where it was suspended. The 3.3V at VP pin is buffered by the RT5002 once it is in charging state or its PMU part is enabled. For 100k Ω NTC thermistor, the input pin, TSSEL, should be connected to GND. For 10k Ω NTC thermistor, the input pin, TSSEL, should be connected to VIN. TSSEL determines the TS threshold levels for 0 °C and 60°C. It also defines the TS threshold levels used in JEITA operation. The choosing method of R1 and R2 to meet battery temperature monitoring is shown below : Case 1 : TSSEL = L (For 100k Ω NTC) : 0.74 x VP + - + - VP Too Cold Too Hot TS R1 R2 RNTC VP 0.28 x VP Figure 1 Too Cold Temperature RCOLD = RNTC Too Hot Temperature RHOT = RNTC COLD COLD HOT HOT COLD HOT HOT COLD COLD COLD COLD R2 + R = 0.74 R +R1+R2 R2 + R = 0.28 R +R1+R2 Form (1), (2) RR R1 = 2.457 R2 = 0.389 R1R If R2 < 0 R = 0.74 R +R1 Form (3) R R1 = R 0.74 − ×− − (1) (2) (3) JEITA Battery Temperature Standard CV regulation voltage will change at the following battery temperature ranges : 0 °C to 10°C and 45°C to 60°C. CC regulation current will change at the following battery temperature ranges : 0 °C to 10°C and 45°C to 60°C. |
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