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8024A–AVR–04/08
ATmega8HVA/16HVA
23. Battery Protection
23.1
Features
Short-circuit Protection
Discharge Over-current Protection
Charge Over-current Protection
Discharge High-current Protection
Charge High-current Protection
Programmable and Lockable Detection Levels and Reaction Times
Autonomous Operation Independent of CPU
23.2
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 discharge FET. This provides safety
in case the application software should unintentionally re-enable the discharge FET 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.
The effect of the various battery protection types is given in Table 23-1.
In order to reduce power consumption, Short-circuit, Discharge High-current and Discharge
Over-current Protection are automatically deactivated when the D-FET is disabled. The Charge
Over-current and Charge High-current Protection are disabled when the C-FET is disabled. Note
however that Charge Over-current Protection and Charge High-current Protection are never
automatically disabled when the chip is operated in DUVR mode.
Table 23-1.
Effect of Battery Protection Types
Battery Protection Type
Interrupt Requests
C-FET
D-FET
MCU
Short-circuit Protection
Entry
Disabled
Operational
Discharge Over-current
Protection
Entry
Disabled
Operational
Charge Over-current
Protection
Entry
Disabled
Operational
Discharge High-current
Protection
Entry
Disabled
Operational
Charge High-current
Protection
Entry
Disabled
Operational
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