ATmega16HVB Atmel Corporation, ATmega16HVB Datasheet - Page 108

• 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

19. Coulomb counter – Dedicated fuel gauging Sigma-Delta ADC
19.1
19.2
108
Features
Overview
ATmega16HVB/32HVB
•
•
•
•
•
•
•
The Atmel ATmega16/32HVB features a dedicated Sigma-Delta ADC (CC-ADC) optimized for
Coulomb Counting. By sampling the charge or discharge current flowing through an external
sense resistor RSENSE, the CC-ADC is used to track the flow of current going into and out of
the battery cells.
Figure 19-1. Coulomb counter block diagram.
The CC-ADC has a programmable voltage range allowing trade-off to be made between resolu-
tion, dynamic range and external sense resistor RSENSE.
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
R
Sampled system Coulomb counter
Low power Sigma-Delta ADC optimized for Coulomb counting
Instantaneous current output with 3.9ms conversion time
Accumulate current output
Regular current detection mode
Programmable input voltage range ±100/200mV
Offset canceling by input polarity switching
SENSE
– 13-bit resolution (including sign bit)
– Interrupt on instantaneous current conversion complete
– Programmable conversion time: 128/256/512/1024ms
– 18-bit resolution (including sign bit)
– Interrupt on accumulation current conversion complete
– Programmable sampling interval: 256/512/1024/2048ms
– Allowing measurement of ±20/40A @ 5mΩ
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
8042D–AVR–10/11
Current