DS32KHZ Ver la hoja de datos (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS32KHZ

32.768kHz Temperature-Compensated Crystal Oscillator

Dallas Semiconductor -> Maxim Integrated 

DS32kHz

PIN DESCRIPTION

PIN

SO

BGA

1

C4, C5, D4, D5

2

3–12, 15, 16

13

14

C2, C3, D2, D3

A7, A8, B7, B8,

C7, C8, D7, D8

All remaining

balls

A4, A5, B4, B5

DIP

12

13

1, 6–11, 14

4

5

NAME

32kHz

VCC

N.C.

GND

VBAT

FUNCTION

32.768kHz Push-Pull Output

Primary Power Supply

No Connection (Must be grounded)

Ground

+3V Nominal Supply Input. Used to operate the

device when VCC is absent.

Figure 2. Delta Time and Frequency vs. Temperature

20

0

0

-20

Crystal +20ppm

-40

-60

Typical Crystal,

Uncompensated

DS32kHz

Accuracy

Band

-20

-80

-40

-100

-120

Crystal -20ppm

-60

-140

-160

-80

-180

-200

-40 -30 -20 -10 0

-100

10 20 30 40 50 60 70 80

Temperature (°C)

FUNCTIONAL DESCRIPTION

The DS32kHz is a temperature-compensated crystal oscillator (TCXO) that outputs a 32,768Hz square wave.

While the DS32kHz is powered by either supply input, the device measures the temperature every 64 seconds and

adjusts the output frequency. The device requires four pins for operation: VCC, GND, VBAT, and 32kHz. (See

Figure 4 for connection schemes.) Power is applied through VCC and GND, while VBAT is used to maintain the

32kHz output in the absence of power. Once every 64 seconds, the DS32kHz measures the temperature and

adjusts the output frequency. The output is accurate to ±2ppm (±1 min/yr) from 0°C to +40°C and to ±7.5ppm

(±4 min/year) from -40°C to 0°C and from +40°C to +85°C.

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