ATmega16HVB datasheet(3/273 Pages) ATMEL

3 / 273 page

8042A–AVR–07/09

ATmega16HVB/32HVB

1.2.4

VREG

Output from the internal Voltage Regulator. Used for external decoupling to ensure stable regu-

lator operation. For details, see ”Voltage Regulator” on page 132.

1.2.5

VREF

Internal Voltage Reference for external decoupling. For details, see ”Voltage Reference and

Temperature Sensor” on page 123.

1.2.6

VREFGND

Ground for decoupling of Internal Voltage Reference. For details, see ”Voltage Reference and

Temperature Sensor” on page 123. Do not connect to GND or SGND on PCB.

1.2.7

GND

Ground

1.2.8

Port A (PA3..PA0)

Port A serves as a low-voltage 4-bit bi-directional I/O port with internal pull-up resistors (selected

for each bit). As inputs, Port A pins that are externally pulled low will source current if the pull-up

resistors are activated. The Port A pins are tri-stated when a reset condition becomes active,

even if the clock is not running.

Port A also serves the functions of various special features of the ATmega16HVB/32HVB as

listed in ”Alternate Functions of Port A” on page 74.

1.2.9

Port B (PB7..PB0)

Port B is a low-voltage 8-bit bi-directional I/O port with internal pull-up resistors (selected for

each bit). As inputs, Port B pins that are externally pulled low will source current if the pull-up

resistors are activated. The Port B pins are tri-stated when a reset condition becomes active,

even if the clock is not running.

Port B also serves the functions of various special features of the ATmega16HVB/32HVB as

listed in ”Alternate Functions of Port B” on page 75.

1.2.10

Port C (PC5)

Port C (PC5) is a high voltage Open Drain output port.

1.2.11

Port C (PC4..PC0)

Port C is a 5-bit high voltage Open Drain bi-directional I/O port.

1.2.12

OC/OD

High voltage output to drive Charge/Discharge FET. For details, see ”FET Driver” on page 148.

1.2.13

PI/NI

Filtered positive/negative input from external current sense resistor, used to by the Coulomb

Counter ADC to measure charge/discharge currents flowing in the battery pack. For details, see

”Coulomb Counter - Dedicated Fuel Gauging Sigma-delta ADC” on page 108.

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