ATMEGA406_0607 datasheet(6/263 Pages) ATMEL

6 / 263 page

2548E–AVR–07/06

ATmega406

2.2.10

Port C (PC0)

Port C is a high voltage Open Drain output port.

2.2.11

Port D (PD1:PD0)

Port D is a low-voltage 2-bit bi-directional I/O port with internal pull-up resistors (selected for

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

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

even if the clock is not running.

Port D also serves the functions of various special features of the ATmega406 as listed in ”Alter-

nate Functions of Port D” on page 72.

2.2.12

SCL

SMBUS clock, Open Drain bidirectional pin.

2.2.13

SDA

SMBUS data, Open Drain bidirectional pin.

2.2.14

OC/OD/OPC

High voltage output to drive external Charge/Discharge/Pre-charge FETs. For details, see ”FET

Control” on page 133.

2.2.15

PI/NI

Unfiltered positive/negative input from external current sense resistor, used by the battery pro-

tection circuit, for over-current and short-circuit detection. For details, see ”Battery Protection” on

page 125.

2.2.16

PPI/NNI

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 106.

2.2.17

NV/PV1/PV2/PV3/PV4

NV, PV1, PV2, PV3, and PV4 are the inputs for battery cells 1, 2, 3 and 4, used by the Voltage

ADC to measure each cell voltage. For details, see ”Voltage ADC – 10-channel General Pur-

pose 12-bit Sigma-Delta ADC” on page 116.

2.2.18

PVT

PVT defines the pull-up level for the OD output.

2.2.19

BATT

Input for detecting when a charger is connected. This pin also defines the pull-up level for OC

and OPC outputs.

2.2.20

RESET

Reset input. A low level on this pin for longer than the minimum pulse length will generate a

reset, even if the clock is not running. The minimum pulse length is given in Table 11 on page

38. Shorter pulses are not guaranteed to generate a reset.

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