3

8042A–AVR–07/09

ATmega16HVB/32HVB

1.2.4

VREF

1.2.5

VREFGND

1.2.6

GND

Ground

1.2.7

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

1.2.8

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

1.2.9

Port C (PC5)

Port C (PC5) is a high voltage Open Drain output port. Port C serves the functions of various

1.2.10

Port C (PC4..PC0)

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

1.2.11

OC/OD

1.2.12

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