ATmega32HVB datasheet(230/273 Pages) ATMEL

230 / 273 page

230

8042A–AVR–07/09

ATmega16HVB/32HVB

32.4

Reset Characteristics

Notes:

1. The voltage at the Pack + terminal will be slightly higher than VPOT when the chip is enabled. This is because of an internal

Pull-down current on the BATT pin in the range 50 - 150 uA and the RBATT resistor connected between the Pack + terminal

and the BATT pin. R

BATT = 1k gives a voltage drop 0.05 - 0.15V.

2. The power-on reset will not work unless the voltage has been below VPOT (falling) after a power-off condition.

32.5

Voltage Regulator Characteristics

32.6

Voltage reference and Temperature Sensor Characteristics

Notes:

1. Calibration is done in Atmel factory test. Software should calibrate the VREF by writing the BGCRR and BGCCR registers

with the calibration values stored in the signature row.

2. This value is not tested in production.

Table 32-3.

TA= -40 to 85°C unless otherwise noted.

Symbol

Parameter

Condition

Min

Typ

Max

Units

VPOT

Power-on Threshold Voltage (rising)(1)

4.5

Power-on Threshold Voltage (falling)(1)(2)

4.5

6.3

tRST

Minimum pulse width on RESET Pin

900

VBOT

Brown-Out Detection (BOD) Trigger Level

TA= 25°C

2.9

HYST

BOD Level Hysteresis

A= 25°C

Table 32-4.

TA= -40 to 85°C unless otherwise noted.

Symbol

Parameter

Condition

Min

Typ

Max

Unit

VREG

Regulator Output Voltage

VFET=16.8V, IOUT=20mA

3.1

VFET=6V, I

OUT=20mA

3.1

VFET=4V, IOUT=7mA

3.1

VRSCL

Voltage Regulator Short- circuit Level at

VFET pin

3.3

3.7

BLOD

Voltage Regulator Black-out Detection

Level at VREG pin

A= 25°C

2.65

Table 32-5.

TA= -40 to 85°C unless otherwise noted.

Parameter

Condition

Min

Typ

Max

Unit

Reference Voltage

1.100

Ref. Voltage Accuracy(1)

After factory calibration, T

A= 25°C

± 0.1

± 0.2

Temperature Drift(1)(2)

TA = -40° - 85°C60

ppm/K

A = 0° - 60°C25

VREF calibration

Hold Off Time

CREG=2.2µF, BGCCR write

µs

CREG=2.2µf, BGCRR write

PTAT, Voltage Proportional

to Absolute Temperature(2)

0.6

mV/K

VPTAT Absolute Accuracy

(3)

± 5

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