ATAVRSB202 Atmel, ATAVRSB202 Datasheet - Page 26

• 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

9.1.4
9.1.5
9.1.6
9.2
9.2.1
8042B–AVR–06/10
Clock Sources
Voltage ADC Clock – clk
Coulomb Counter ADC Clock - clk
Watchdog Timer and Battery Protection Clock
Calibrated Fast RC Oscillator
The Voltage ADC is provided with a dedicated clock domain. The VADC clock is automatically
prescaled relative to the System Clock Prescalers setting by the VADC Prescaler, giving a fixed
VADC clock at 1 MHz.
The Coulomb Counter ADC is provided with a dedicated clock domain. This allows operating the
Coulomb Counter ADC in low power modes like Power-save for continuous current
measurements.
The Watchdog Timer and Battery Protection are provided with a dedicated clock domain. This
allows operation in all modes except Power-off. It also allows very low power operation by utiliz-
ing an Ultra Low Power RC Oscillator dedicated to this purpose.
The following section describes the clock sources available in the device. The clocks are input to
the AVR clock generator, and routed to the appropriate modules.
The ATmega16HVB/32HVB has 3 on-board oscillator used to clock the internal logic.
shows the clock sources and their usage.
Table 9-1.
The calibrated Fast RC Oscillator by default provides a 8.0 MHz clock. The frequency is nominal
value at 25°C. This clock will operate with no external components. During reset, hardware
loads the calibration byte into the FOSCCAL Register and thereby automatically calibrates the
Fast RC Oscillator. At 25°C, this calibration gives a frequency of 8 MHz ± 1%. The oscillator can
be calibrated to any frequency in the range 7.3 - 8.1 MHz by changing the FOSCCAL register.
For more information on the pre-programmed calibration value, see the section
Signature Row from Software” on page
by the
Calibrated Fast RC Oscillator
Ultra Low Power RC Oscillator
Slow RC Oscillator
”System Clock Prescaler” on page
VADC
Clock Source
Available Clock Sources.
CCADC
The clock source for the CPU, I/O, Flash, and Voltage ADC.
The clock source for the Watchdog Timer, Battery Protection,
Bandgap Buffer Short Circuit Detector, and SMBus
Connect/Disconnect.
Used by the Coulomb Counter ADC and Oscillator Sampling
Interface (OSI).
199. Note that the frequency of the system clock is given
28.
ATmega16HVB/32HVB
Usage
”Reading the
Table 9-1
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