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BQ2007 Datasheet(PDF) 7 Page - Texas Instruments |
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BQ2007 Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 16 page  Display Driver Modes The bq2007 is designed to interface with LCD or LED type displays. The LED signal levels are driven when the MSEL soft-programmed input is pulled to VCC at ini- tialization. The output pin COM is the common anode connection for LED SEGA–G. The LCD interface mode is enabled when the MSEL soft-programmed input pin is pulled to VSS at initializa- tion. An internal oscillator generates all the timing sig- nals required for the LCD interface. The output pin COM is the common connection for static direct-driving of the LCD display backplane and is driven with an AC signal at the frame period. When enabled, each of the SEGA–G pins is driven with the correct-phase AC signal to activate the LCD segment. In bargraph or BCD mode, output pins SEGA–G interface to LED or LCD segments. Battery Voltage and Temperature Measurement The battery voltage and temperature are monitored within set minimum and maximum limits. When MULT is pulled up to VCC, battery voltage is sensed at the BAT pin by a resistive voltage divider that divides the terminal voltage between 0.262 ∗ VCC (VEDV) and 0.8 ∗ VCC (VMCV). The bq2007 charges multi-cell battery packs from a mini- mum of N cells, to a maximum of 1.5 ∗ N cells. The battery voltage divider is set to the minimum cell battery pack (N) by the BAT pin voltage divider ratio equation: R1 N R21 33 1 =− ( . ) When MULT is pulled down to VSS, tighter charge voltage limits and voltage-based charge status display are selected. This is recommended for charging packs with a fixed number of cells where the battery voltage divider range is between 0.4 ∗ VCC (VEDV) and 0.8 ∗ VCC 7 bq2007 Mode Display Indication SEGA SEGB SEGC SEGD SEGE SEGF SEGG QDSEL = H 20% charge 1000000 30% charge 1100000 40% charge 1110000 60% charge 1111000 80% charge 1111100 90% charge 1111110 Charge complete 1111111 QDSEL = L 0% charge—digit 0 1111110 10% charge—digit 1 0110000 20% charge—digit 2 1101101 30% charge—digit 3 1111001 40% charge—digit 4 0110011 50% charge—digit 5 1011011 60% charge—digit 6 1011111 70% charge—digit 7 1110010 80% charge—digit 8 1111111 90% charge—digit 9 1111011 Charge complete—letter F 1000111 Fault condition—letter E 1001111 Discharge—letter d 0111101 Note: 1 = on; 0 = off; L = pulled down to VSS; H = pulled up to VCC. Table 3. bq2007 Charge Status Display Summary |
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