ATmega16HVB Atmel Corporation, ATmega16HVB Datasheet - Page 132

• Manufacturer Part Number: ATmega16HVB
• Manufacturer: Atmel Corporation

Specifications of ATmega16HVB

• Flash (kbytes): 16 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 8 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 8
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 17
• Ext Interrupts: 15
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 12
• Adc Speed (ksps): 1.9
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 1
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 4.0 to 25
• Operating Voltage (vcc): 4.0 to 25
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 4
• Input Capture Channels: 2
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

24. Battery protection
24.1
24.2
Table 24-1.
132
Battery protection type
Short-circuit Protection
Discharge Over-current
Protection
Charge Over-current
Protection
Discharge High-current
Protection
Charge High-current
Protection
External Protection Input
Features
Overview
ATmega16HVB/32HVB
Effect of battery protection types.
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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 one 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
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
Interrupt requests
Entry and/or Exit
Entry
Entry
Entry
Entry
Entry
Operational
Operational
Operational
Operational
Operational
Operational
PC-FET
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
C-FET
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
D-FET
Table
Cell balancing
Operational
Operational
Operational
Operational
Operational
Operational
24-1.
FETs
8042D–AVR–10/11
Operational
Operational
Operational
Operational
Operational
Operational
MCU