ATAVRSB202 Atmel, ATAVRSB202 Datasheet - Page 132

• 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

23. Voltage Regulator
23.1
23.2
8042B–AVR–06/10
Features
Overview
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ATmega16HVB/32HVB get its voltage supply through the VFET terminal. Operating range at the
VFET terminal is 4 - 25V. The on-chip LDO regulator regulates the VFET terminal down to 3.3V,
which is a suitable supply voltage for the internal logic, I/O lines and analog circuitry.
1
Figure 23-1. Voltage Regulator.
To ensure safe operating condition the Voltage Regulator has built in protection mechanisms to
protect the internal circuitry if the voltage drops on either the input or output terminal. The Regu-
lator Monitoring includes
• Battery Pack Short Detector
• Black-out Detector
An external decoupling capacitor (CREG) of minimum 1 µF is needed to ensure stable regulator
operation. The same capacitor also serves as a reservoir capacitor to ensure that the chip is
able to operate for some time without voltage at the VFET terminal.
illustrates the Voltage Regulator.
Input voltage from 4-25V
Fixed output voltage of 3.3V
Battery Pack Short Detection
Black-out Detection (BLOD)
VFET
DISABLE VFET
Short Detect
Battery
and Control Interface
Regulator Monitor
LDO Regulator
ROCR
Databus
Black-out
ATmega16HVB/32HVB
Detect
IRQ
BLOD
POWER-OFF
Figure 23-
VREG
CREG
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