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ATMEGA16HVA Datasheet(PDF) 5 Page - ATMEL Corporation |
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ATMEGA16HVA Datasheet(HTML) 5 Page - ATMEL Corporation |
5 / 22 page 5 8024AS–AVR–04/08 ATmega8HVA/16HVA 2. Overview The ATmega8HVA/16HVA is a monitoring and protection circuit for 1-cell and 2-cell Li-ion appli- cations with focus on high security/authentication, accurate monitoring, low cost and high utilization of the cell energy. The device contains secure authentication features as well as autonomous battery protection during charging and discharging. The chip allows very accurate accumulated current measurements using an 18-bit ADC with a resolution of 0.84 µV. The fea- ture set makes the ATmega8HVA/16HVA a key component in any system focusing on high security, battery protection, accurate monitoring, high system utilization and low cost. Figure 2-1. Block Diagram A combined step-up and linear voltage regulator ensures that the chip can operate with supply voltages as low as 1.8V for 1-cell applications. The regulator automatically switches to linear mode when the input voltage is sufficiently high, thereby ensuring a minimum power consump- tion at all times. For 2-cell applications, only linear regulation is enabled. The regulator capabilities, combined with an extremely low power consumption in the power saving modes, greatly enhances the cell energy utilization compared to existing solutions. The chip utilizes Atmel's patented Deep Under-voltage Recovery (DUVR) mode that supports pre-charging of deeply discharged battery cells without using a separate Pre-charge FET. PORTA (2) SRAM Flash CPU EEPROM PV2 NV OC OD FET Control Voltage ADC Voltage Reference Coulumb Counter ADC GND VCC RESET/dW Power Supervision POR & RESET Watchdog Oscillator Watchdog Timer Oscillator Circuits / Clock Generation VREF VREFGND PI NI PA1..0 PA1..0 8/16-bit T/C1 8/16-bit T/C0 PORTB (4) PB3..0 SPI Voltage Regulator Charger Detect VFET VREG BATT PV1 DATA BUS CF1N CF2N CF1P CF2P VPTAT Battery Protection Security Module PORTC (1) PC0 Voltage Regulator Monitor Interface PB0 Oscillator Sampling Interface Program Logic debugWIRE |
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