RV-3049 datasheet(36/65 Pages) MICROCRYSTAL

36 / 65 page

Micro Crystal

DTCXO Temperature Compensated Real Time Clock / Calendar Module

RV-3049

36/65

4.9. CLOCK OUTPUT CLKOUT

The internal reference frequency is generated by the oscillator-circuitry operating a 32.768 kHz “Tuning-Fork”

Quartz Crystal.

A programmable square wave is available at CLKOUT pin. Frequencies of 32.768 kHz, 1024 Hz, 32 Hz or 1 Hz can

be generated for use as a system clock, microcontroller clock, input to a charge pump or for test purposes.

The duty cycle of the selected clock is not controlled. However, due to the nature of the clock generation, all

frequencies will be 50:50 except the 32.768 kHz.

The frequency 32.768 kHz is clocked directly from the oscillator-circuitry, as a consequence of that, this frequency

does not contain frequency compensation clock pulses. The frequencies 1024 / 32 / 1 Hz are clocked from the

prescaler and contain frequency compensation clock pulses.

Operation is controlled by the bits “FD1” / “FD0” (bit 2 & 3 in the register EEPROM Control).

If “Clk/Int” is = “1” (bit 7 in register Control_1), CLKOUT pin becomes a push-pull CLKOUT output and can be

enabled / disabled with the CLKOE pin. When disabled with CLKOE pin = “low”, the CLKOUT output is pulled low.

Address

Function

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

30h

EEPROM Control

R80k

R20k

R5k

R1k

FD1

FD0

ThE

Bit

CLKOUT Frequency

Typ. Duty Cycle

Remarks

FD1

FD0

[Hz]

3 to 2

32768

40:60 to 60:40

Directly from 32.768kHz oscillator

circuitry, without freq. compensation

1024

50:50

With frequency compensation

50:50

With frequency compensation

50:50

With frequency compensation

1) Duty cycle definition: % HIGH-level time : % LOW-level time

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