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ATmega16HVB Datasheet(PDF) 135 Page - ATMEL Corporation |
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ATmega16HVB Datasheet(HTML) 135 Page - ATMEL Corporation |
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135 / 273 page  135 8042A–AVR–07/09 ATmega16HVB/32HVB 24. Battery Protection 24.1 Features • Short-circuit Protection • Discharge Over-current Protection • Charge Over-current Protection • Discharge High-current Protection • Charge High-current Protection • External Protection Input • Programmable and Lockable Detection Levels and Reaction Times • Autonomous Operation Independent of CPU 24.2 Overview The Current Battery Protection circuitry (CBP) monitors the charge and discharge current and disables C-FET and D-FET if a Short-circuit, Over-current or High-current condition is detected. There are five different programmable detection levels: Short-circuit Detection Level, Discharge Over-current Detection Level, Charge Over-current Detection Level, Discharge High-current Detection Level, Charge High-current Detection Level. There are three different programmable delays for activating Current Battery Protection: Short-circuit Reaction Time, Over-current Reac- tion Time and High-current Reaction Time. After Current Battery Protection has been activated, the application software must re-enable the FETs. The Battery Protection hardware provides a hold-off time of 1 second before software can re-enable the FETs. This provides safety in case the application software should unintentionally try to re-enable the FETs too early. The activation of a protection also issues an interrupt to the CPU. The battery protection inter- rupts can be individually enabled and disabled by the CPU. In addition, the module offers an External Protection Input. The activation of the External Protec- tion Input operates independently of the rest of the battery protection mechanisms. The activation/deactivation of this protection is instantaneously controlled from the External Protec- tion Input port, and will not deactivate or affect the other battery protection mechanisms. The effect of the various battery protection types are given in Table 24-1. Table 24-1. Effect of Battery Protection Types Battery Protection Type Interrupt Requests PC-FET C-FET D-FET Cell Balancing FETs MCU Short-circuit Protection Entry Operational Disabled Disabled Operational Operational Discharge Over-current Protection Entry Operational Disabled Disabled Operational Operational Charge Over-current Protection Entry Operational Disabled Disabled Operational Operational Discharge High-current Protection Entry Operational Disabled Disabled Operational Operational Charge High-current Protection Entry Operational Disabled Disabled Operational Operational External Protection Input Entry and/or Exit Operational Disabled Disabled Operational Operational |
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