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BQ2050SN Datasheet(PDF) 4 Page - Texas Instruments |
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BQ2050SN Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 27 page  Voltage Thresholds In conjunction with monitoring VSR for charge/discharge currents, the bq2050 monitors the battery potential through the SB pin. The voltage is determined through a resistor-divider network per the following equation: RB1 RB2 2N =− 1 where N is the number of cells, RB1 is connected to the positive battery terminal, and RB2 is connected to the negative battery terminal. The single-cell battery volt- age is monitored for the end-of-discharge voltage (EDV). EDV threshold levels are used to determine when the battery has reached an “empty” state. Two EDV thresholds for the bq2050 are programmable with the default values fixed at: EDV1 (early warning) = 1.52V EDVF (empty) = 1.47V If VSB is below either of the two EDV thresholds, the as- sociated flag is latched and remains latched, independ- ent of VSB, until the next valid charge. The VSB value is also available over the serial port. During discharge and charge, the bq2050 monitors VSR for various thresholds used to compensate the charge and discharge rates. Refer to the count compensation section for details. EDV monitoring is disabled if the discharge rate is greater than 2C (typical) and resumes 1 2 second after the rate falls below 2C. RBI Input The RBI input pin is intended to be used with a storage ca- pacitor or external supply to provide backup potential to the internal bq2050 registers when VCC drops below 3.0V. VCC is output on RBI when VCC is above 3.0V. A diode is re- quired to isolate the external supply. Reset The bq2050 can be reset either by removing VCC and grounding the RBI pin for 15 seconds or by writing 0x80 to register 0x39. Temperature The bq2050 internally determines the temperature in 10°C steps centered from approximately -35°C to +85°C. The temperature steps are used to adapt charge and dis- charge rate compensations, self-discharge counting, and available charge display translation. The temperature range is available over the serial port in 10°C incre- ments as shown in the following table: Layout Considerations The bq2050 measures the voltage differential between the SR and VSS pins. VOS (the offset voltage at the SR pin) is greatly affected by PC board layout. For optimal results, the PC board layout should follow the strict rule of a single-point ground return. Sharing high-current ground with small signal ground causes undesirable noise on the small signal nodes. Additionally: n The capacitors (C1 and C2) should be placed as close as possible to the VCC and SB pins, respectively, and their paths to VSS should be as short as possible. A high-quality ceramic capacitor of 0.1 µf is recommended for VCC. n The sense resistor capacitor should be placed as close as possible to the SR pin. n The sense resistor (RS) should be as close as possible to the bq2050. 4 bq2050 TMP (hex) Temperature Range 0x < -30°C 1x -30°C to -20°C 2x -20°C to -10°C 3x -10°C to 0°C 4x 0°C to 10°C 5x 10°C to 20°C 6x 20°C to 30°C 7x 30°C to 40°C 8x 40°C to 50°C 9x 50°C to 60°C Ax 60°C to 70°C Bx 70°C to 80°C Cx > 80°C Not Recommended For New Designs |
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Similar Description - BQ2050SN |
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