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AIC1783CS Datasheet(PDF) 8 Page - Analog Intergrations Corporation |
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AIC1783CS Datasheet(HTML) 8 Page - Analog Intergrations Corporation |
8 / 11 page AIC1783 8 The functions and charging states control mentioned above are illustrated in the function flow chart of AIC1783 (Fig. 2) DESIGN GUIDE Battery Voltage Measurement The AIC1783 measures the battery voltage through VBT pin, which is connected to battery positive terminal through a resistor-divider net work, as shown in Fig. 1 VBAT RA RB C5 7 R5 100K C6 AIC1783 VBT + FIG. 1 Battery Voltage Divider The suggested divider resistance of RA and RB for the corresponding number of battery cells are as below: BATTERY CELLS RA/RB RA (K Ω) RB (K Ω) 2~4 2 240 120 3~6 3.3 300 91 4~8 4.9 300 62 5~10 6.4 300 47 6~12 7.8 310 39 8~16 10.8 390 36 Setting the Period of Safety Timer The AIC1783 provides a method for linearly adjusting the period of safety timer with an external resistor connected from TIMER pin to GND. The relation between safety timer length and the external resistor (RTIMER) is shown in Fig. 3. The table following shows the resistor values for some of the commonly chosen safety timer periods. Also shown in the table are their corresponding oscillator frequencies. 0 100 200 300 400 500 0 200 400 600 800 Safety Timer (min.) Fig. 3 Safety Timer vs. RTIMER |
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