ATmega8HVA Atmel Corporation, ATmega8HVA Datasheet - Page 104

• Manufacturer Part Number: ATmega8HVA
• Manufacturer: Atmel Corporation

Specifications of ATmega8HVA

• Flash (kbytes): 8 Kbytes
• Pin Count: 28
• Max. Operating Frequency: 4 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 3
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 6
• Ext Interrupts: 3
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 6
• Adc Resolution (bits): 12
• Adc Speed (ksps): 1.9
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.5
• Eeprom (bytes): 256
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -20 to 85
• I/o Supply Class: 1.8 to 9.0
• Operating Voltage (vcc): 1.8 to 9.0
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 4
• Input Capture Channels: 2
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

19. Coulomb Counter - Dedicated Fuel Gauging Sigma-delta ADC
19.1
19.2
Figure 19-1. Coulomb Counter Block Diagram
104
Features
Overview
ATmega8HVA/16HVA
R
SENSE
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ATmega8HVA/16HVA features a dedicated Sigma-Delta ADC (CC-ADC) optimized for Coulomb
Counting. By sampling the voltage across an external sense resistor R
used to track the flow of current going into and out of the battery cells.
In normal conversion mode two different output values are provided, Instantaneous Current and
Accumulate Current. The Instantaneous Current Output has a short conversion time at the cost
Sampled System Coulomb Counter
Low Power Sigma-Delta ADC Optimized for Coulomb Counting
Instantaneous Current Output with 3.9 ms Conversion Time
Accumulate Current Output
Regular Current Detection Mode
Input Voltage Range ± 100mV
Offset canceling by input polarity switching
– 13 bit Resolution (including sign bit)
– Interrupt on Instantaneous Current Conversion Complete
– Programmable Conversion Time: 125/250/500/1000 ms
– 18-bit Resolution (including sign bit)
– Interrupt on Accumulation Current Conversion Complete
– Programmable Sampling Interval: 250/500/1000/2000 ms
– Allowing Measurement of ± 10A @ 10 mΩ
PI
NI
Switcher
Polarity
Current Level
Comparator
Regular
Current
Sigma Delta
modulator
IRQ
Instantaneous
Register
Current
Decimation
8-BIT DATABUS
Filter
IRQ
Control &
Registers
Status
Decimation
Filter
IRQ
Accumulate
Register
Current
SENSE
, the CC-ADC is
8024A–AVR–04/08