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RT5021 数据表(PDF) 41 Page - Richtek Technology Corporation |
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RT5021 数据表(HTML) 41 Page - Richtek Technology Corporation |
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41 / 67 page  RT5021 41 DS5021-01 April 2013 www.richtek.com Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. © 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) thermal resistor 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 to normal operating range, charging will resume and the safe charge timer will continue to count down from the point where it was suspended. Note that although charging is suspended due to the battery pack temperature fault, the CHG pin will flash at 0.5Hz and indicate charging. The 3.3V at VP pin is buffered by the RT5021 once it is in charging state or its PMU part is enabled. If a 100k Ω NTC thermal resistor is used, the A0.TSSEL bit should be set to “1”. If a 10kΩ NTC thermal resistor is used, the A0.TSSEL bit should be set to “0”. The TSSEL bit 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 shows as below. Case 2 : TSSEL = L (For 10k Ω NTC) : Figure 5 Case 1 : TSSEL = H (For 100k Ω NTC) : 0.74 x VP + - + - VP Too Cold Too Hot TS R1 R2 RNTC VP 0.28 x VP Figure 4 --------------------------------------- (1) ----------------------------------------- (2) ---------------------------------------------- (3) ------------------------------------------ (1) ------------------------------------------ (2) ------------------------------------------------- (3) () ×− ×− − COLD COLD HOT HOT COLD HOT HOT COLD COLD COLD COLD R2 + R = 0.6 R+R1+R2 R2 + R = 0.28 R+R1+R2 Form (1), (2) R1 = 0.9 R R R2 = 0.388 R1 R 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 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 RR1 R2 R2 R = 0.28 RR1 R2 Form (1), (2) RR R1 = 2.457 R2 = 0.389 R1 R If R2 < 0 R = 0.74 RR1 Form (3) R R1 = R 0.74 + ++ + ++ − ×− + − 0.6 x VP + - + - VP Too Cold Too Hot TS R1 R2 RNTC VP 0.28 x VP |
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