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SS4036G Datasheet(PDF) 6 Page - Silicon Standard Corp. |
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SS4036G Datasheet(HTML) 6 Page - Silicon Standard Corp. |
6 / 9 page www.SiliconStandard.com 6 of 9 SS4036G 1/09/2006 Rev.3.01 VOLTAGE, CURRENT AND TEMPERATURE SENSING 10k Ω CELL2 CELL1 RA 6.8k Ω 103AT THERMISTER R13 51k Ω 51k Ω R14 51k Ω 100m Ω VDD RB 20k Ω 3k Ω LED VDD 1 GND 8 TEMP 2 V2 7 CCTL 3 V1 6 LED 4 ISENSE 5 SS4036G Figure 3. Cell voltage, current sense and temperature sensor Figure 3 shows the cell voltage sense, current sense sense and temperature detecting circuit. The pack pack voltage is divided by 2 (by using two equal resistors, R13 and R14). This guarantees that the the voltage on the V2 input pin (7) will not exceed VDD. The SS4036G monitors the charge current by measuring at the Isense input pin (5) the voltage drop across a sense resistor, connected between VSS (battery negative) and GND (Charger ground). The value of this resistor should be between 50m Ω and 150m Ω . To detect the temperature, a negative-temperature- coefficient thermistor is used as a sensor. A 103AT sensor. A 103AT and a voltage divider (resistor RA and RB) are recommended. The resistor values for RA and RB are calculated using the following equations: Where, VDD is 5V Rc is the cold temperature resistance Rh is the hot temperature resistance RA, RB are in k Ω . Example : For thermistor 103AT, the hot temperature temperature is 55°C and the cold temperature is 5°C, then RA = 6.8kΩ , RB= 20kΩ . The temperature detection can be disabled by connecting the Temp pin (2) to VDD. 1.615 x Rc x Rh Rc - Rh RA = 5 x Rc x Rh 2Rc - 7 Rh RB = |
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