BQ20Z45-R1 datasheet(8/18 Pages) TI

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bq20z45-R1

SLUS992 – DECEMBER 2009

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ELECTRICAL CHARACTERISTICS (continued)

over operating free-air temperature range (unless otherwise noted), TA = –40°C to 85°C, V(REG25) = 2.41 V to 2.59 V,

V(BAT) = 14 V, C(REG25) = 1 µF, C(REG33) = 2.2 µF; typical values at TA = 25°C (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Effective input resistance(10)

TA = 25°C to 85°C

2.5

Ω

INTERNAL TEMPERATURE SENSOR

V(TEMP)

Temperature sensor voltage(11)

-2.0

mV/°C

VOLTAGE REFERENCE

Output voltage

1.215

1.225

1.230

Output voltage drift

PPM/°C

HIGH FREQUENCY OSCILLATOR

f(OSC)

Operating frequency

4.194

MHz

–3%

0.25%

f(EIO)

Frequency error (12) (13)

TA = 20°C to 70°C

–2%

0.25%

t(SXO)

Start-up time(14)

2.5

LOW FREQUENCY OSCILLATOR

f(LOSC)

Operating frequency

32.768

kHz

–2.5%

0.25%

2.5%

f(LEIO)

Frequency error(13) (15)

TA = 20°C to 70°C

–1.5%

0.25%

1.5%

t(LSXO)

Start-up time(14)

500

µs

(10) The CC input is a switched capacitor input. Since the input is switched, the effective input resistance is a measure of the average

resistance.

(11) –53.7 LSB/°C

(12) The frequency error is measured from 4.194 MHz.

(13) The frequency drift is included and measured from the trimmed frequency at V(REG25) = 2.5V, TA = 25°C

(14) The startup time is defined as the time it takes for the oscillator output frequency to be ±3%

(15) The frequency error is measured from 32.768 kHz.

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