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M61040FP Datasheet(PDF) 11 Page - Renesas Technology Corp |
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M61040FP Datasheet(HTML) 11 Page - Renesas Technology Corp |
11 / 25 page M61040FP REJ03F0237-0200 Rev.2.00 Mar 18, 2008 Page 11 of 24 Block Diagram Description (1) Battery voltage detection circuit The M61040 battery voltage detection circuit is shown in figure 3. This circuit is composed of switch, buffer amplifier, reference voltage section and logic circuit. Microcomputer selects detecting voltage before logic circuit controls the connection of switches. This connection decides which cell voltage (Vbat1, Vbat2, Vbat3, Vbat4) should be output from analog out pin. Besides offset voltage can be output. In power down mode, supply current in this block is close to zero because all switches are off. Note: Regard 50 µs as the standard of settling time by voltage change in this block. VIN1 VIN2 S22 S21 S11 VIN3 S32 S31 VIN4 S42 S41 VIN10 S02 S01 Vat1 Vat2 Vat3 Vat4 Vref GND Switch Control From Serial to Parallel conversion circuit Logic Circuit To Multiplexer circuit + − 5 6 7 8 11 Figure 3 Battery Voltage Detection Circuit |
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