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BQ33100PW Datasheet(PDF) 11 Page - Texas Instruments |
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BQ33100PW Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 56 page  bq33100 www.ti.com SLUS987A – JANUARY 2011 – REVISED MARCH 2011 OVERVIEW Super Capacitor Measurements The bq33100 measures the series capacitor voltages or stack voltage, current and temperature using a delta-sigma analog-to-digital converter (ADC). The bq33100 uses this measured data and advanced algorithms to determine the State-of-Health and available capacitance of the Super Capacitor . Voltage The bq33100 has two separate modes, Normal mode and Stack mode, where measurements and taken and managed differently. The setting of Operation Cfg [STACK] to 1 enables Stack mode otherwise the bq33100 operates in normal mode. The bq33100 updates the individual series capacitor voltages at one (1) second intervals when in Normal mode and measurers the stack voltage at one (1) second intervals when in Stack mode . The internal ADC of the bq33100 measures the voltage, scales, and offsets, and calibrates it appropriately. To ensure an accurate differential voltage sensing, the IC ground should be connected directly to the most negative terminal of the Super Capacitor stack, not to the positive side of the sense resistor. This minimizes the voltage drop across the PCB trace. Current, Charge and Discharge Counting The delta-sigma ADC measures the system current of the Super Capacitor by measuring the voltage drop across a small-value sense resistor (typically 5 m Ω to 20 mΩ typ.) between the SRP and SRN pins. The ADC measures bipolar signals from -0.20 V to 0.25 V. Device Calibration The bq33100 requires voltage calibration to maximize accuracy of the monitoring system, the bq33100 evaluation software can perform this calibration. The external filter resistors, connected from each capacitor to the VCx input of the bq33100, are required to be 1k Ω. The bq33100 can automatically calibrate its offset between the A to D converter and the input of the high voltage translation circuit during normal operation for maximum capacitor voltage measurement accuracy. Temperature The bq33100 has an internal temperature sensor and input for an external temperature sensor input, TS. The external input is used in conjunction with an NTC thermistor (default is Semitec 103AT) to sense the Super Capacitor temperature. The bq33100 can be configured to use internal or external temperature sensors. Series Capacitor Configuration The bq33100 can be used to monitor 2, 3, 4 or 5 capacitors in series. The appropriate connectivity for the different options are detailed in the following table. Table 2. Series Capacitor Connectivity bq33100 Pin 5-Series 4-Series 3-Series 2-Series VC1 P of Top (5th) Cap P of 4th Cap Short to VC2 Short to VC2 VC2 P of 4th Cap, N of 5th Cap P of 3rd Cap, N of 4th P of 3rd Cap Short to VC3 Cap VC3 P of 3rd Cap, N of 4th Cap P of 2nd Cap, N of 3rd P of 2nd Cap, N of 3rd Cap P of 2nd Cap Cap VC4 P of 2nd Cap, N of 3rd Cap P of Bottom (1st) Cap, N P of Bottom (1st) Cap, N of 2nd P of Bottom (1st) Cap, N of 2nd of 2nd Cap Cap Cap VC5 P of Bottom (1st) Cap, N of N of Bottom Cap (1st) N of Bottom Cap (1st) N of Bottom Cap (1st) 2nd Cap VSS N of Bottom Cap (1st) Short to VC5 Short to VC5 Short to VC5 Copyright © 2011, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): bq33100 |
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