ATMEGA8HVA-4TU Atmel, ATMEGA8HVA-4TU Datasheet - Page 126
ATMEGA8HVA-4TU
Manufacturer Part Number
ATMEGA8HVA-4TU
Description
MCU AVR 8K FLASH 4MHZ 28-TSOP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA16HVA-4CKU.pdf
(196 pages)
Specifications of ATMEGA8HVA-4TU
Core Processor
AVR
Core Size
8-Bit
Speed
4MHz
Connectivity
SPI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
7
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 9 V
Data Converters
A/D 5x12b
Oscillator Type
External
Operating Temperature
-20°C ~ 85°C
Package / Case
28-TSOP
For Use With
ATSTK600 - DEV KIT FOR AVR/AVR32ATSTK500 - PROGRAMMER AVR STARTER KIT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
- Current page: 126 of 196
- Download datasheet (3Mb)
23.7
23.8
126
Charge High-current Protection
Battery Protection CPU Interface
ATmega8HVA/16HVA
When the Discharge High-current Protection is activated, the external D-FET and C-FET are dis-
abled and a Current Protection Timer is started. This timer ensures that the FETs are disabled
for at least one second. The application software must then set the DFE and CFE bits in the FET
Control and Status Register to re-enable normal operation. If the D-FET is re-enabled while the
loading of the battery still is too large, the Discharge High-current Protection will be activated
again.
If the voltage at the PI/NI pins is above the Charge High-current Detection level for a time longer
than High-current Protection Reaction Time, the chip activates Charge High-current Protection.
When the Charge High-current Protection is activated, the external D-FET and C-FET are dis-
abled and a Current Protection Timer is started. This timer ensures that the FETs are disabled
for at least one second. The application software must then set the DFE and CFE bits in the FET
Control and Status Register to re-enable normal operation. If the C-FET is re-enabled and the
charger continues to supply too high currents, the Charge High-current Protection will be acti-
vated again.
The Short-circuit, Over-current and High-current Protection parameters are programmable to
adapt to different types of batteries. The parameters are set by writing to I/O Registers. The
Parameter Registers can be locked after the initial configuration, prohibiting any further updates
until the next Hardware Reset.
Refer to ”Register Description for Battery Protection” on page 125 for register descriptions.
The Battery Protection CPU Interface is illustrated in Figure 22-1.
Figure 23-1. Battery Protection CPU Interface
Each protection has an Interrupt Flag. Each Flag can be read and cleared by the CPU, and each
flag has an individual interrupt enable. All enabled flags are combined into a single battery pro-
Battery Protection
Parameter Lock
Register
PI
NI
Battery Protection
Level Register
LOCK?
Battery Protection
Timing Register
Protection
Current
Battery
LOCK?
Battery Protection
Control Register
LOCK?
Power-off
Interrupt
Request
Protection
Current
8-BIT DATA BUS
Acknowledge
Protection
Interrupt
Register
Interrupt
10
Battery
Control
/
FET
5
5
/
/
8024A–AVR–04/08
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