ATAVRSB202 Atmel, ATAVRSB202 Datasheet - Page 108

• Manufacturer Part Number: ATAVRSB202
• Description: KIT BATT MGMT FOR ATMEGA32HVB
• Manufacturer: Atmel

Specifications of ATAVRSB202

• Main Purpose: *
• Embedded: *
• Utilized Ic / Part: *
• Primary Attributes: *
• Secondary Attributes: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

19. Coulomb Counter – Dedicated Fuel Gauging Sigma-delta ADC
19.1
19.2
8042B–AVR–06/10
Features
Overview
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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 resis-
tor 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.
R
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
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: 128/256/512/1024 ms
– 18-bit Resolution (including sign bit)
– Interrupt on Accumulation Current Conversion Complete
– Programmable Sampling Interval: 256/512/1024/2048 ms
– Allowing Measurement of ± 20/40A @ 5 mΩ
PI
NI
Switcher
Polarity
Current Level
Comparator
Regular
Current
Sigma Delta
modulator
IRQ
Instantaneous
Register
Current
ATmega16HVB/32HVB
Decimation
8-BIT DATABUS
Filter
IRQ
Registers
Control &
Status
Decimation
Filter
IRQ
Accumulate
Register
Current
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