DS1075-80 datasheet(5/18 Pages) DALLAS

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Table 2

DIV1

BIT

E/ I

BIT*

MSEL

BIT

OPERATION

0000

INTERNAL OSCILLATOR DIVIDED BY 4*N

0001

INTERNAL OSCILLATOR DIVIDED BY 2*N

INTERNAL OSCILLATOR DIVIDED BY N

EXTERNAL OSCILLATOR DIVIDED BY N

INTERNAL OSCILLATOR DIVIDED BY 1

EXTERNAL OSCILLATOR DIVIDED BY 1

*Assuming PDN bit = 1, otherwise internal/external selection will be controlled by the PDN / SELX pin.

DIV WORD Figure 3

(MSB)

(LSB)

N (9-BITS)

PDN

This bit is used to determine the function of the PDN / SELX pin. If PDN=0, the PDN / SELX pin can be

used to determine the timing reference (either the internal oscillator or an external reference/crystal). If

PDN=1, the PDN /SELX pin is used to put the device into power-down mode.

EN0

This bit is used to determine whether the OUT0 pin is active or not. If EN0 =1, OUT0 is disabled (High-

impedance). If EN0 =0, the internal reference clock (MCLK) is output from OUT0. The OE pin has no

effect on OUT0, but OUT0 is disabled as part of the power-down sequence.

These nine bits determine the value of the programmable divider. The range of divisor values is from 2 to

513, and is equal to the programmed value of N plus 2:

Table 3

BIT

VALUES

DIVISOR (N)

VALUE

000000000

000000001

111111111

513

NOTE:

The maximum value of N is constrained by the minimum output frequency. If the internal clock is

selected, INTOSC/(M*N) must be greater than fOUTmin; if the external clock is selected, EXTCLK/N must

be greater than fOUTmin . (If DIV1=1, then INTOSC or EXTCLK, as applicable, must exceed fOUTmin).

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