DS1085 Datasheet, PDF (8/21 Pages) Dallas Semiconductor – EconOscillator Frequency Synthesizer

Table 7a. PRESCALER P0 DIVISOR M SETTINGS
0M1 0M0
PRESCALER P0
DIVISOR “M”
0
0
1*
0
1
2
1
0
4
1
1
8
*Factory Default Setting
DS1085
Table 7b. PRESCALER P1 DIVISOR M SETTINGS
1M1 1M0 PRESCALER P1
DIVISOR “M”
0
0
1*
0
1
2
1
0
4
1
1
8
*Factory Default Setting
NOTE:
When EN0 = SEL0 = PDN0 = 0, CTRL0 also functions as a power-down. This is a special case for
situations when OUT0 is not used. Under these conditions all the circuitry associated with OUT0 is
powered down. OUT0 is powered down (see Table 2).
PDN1 (Default Setting = 0)
If PDN1 = 1, CTRL1 functions as a power-down (see Table 3).
If PDN1 = 0, CTRL1 functions as an output enable for OUT1 (see Table 3).
NOTES FOR OUTPUT ENABLE AND POWER-DOWN:
1) Both enables are “smart” and wait for the output to be low before going to High-Z.
2) A power-down sequence first disables both outputs before powering down the device.
3) On power-up, the outputs are disabled until the clock has stabilized (~8000 cycles).
4) In power-down mode the device cannot be programmed.
5) A power-down command must persist for at least two cycles of the lowest output frequency plus
10µs.
DIV WORD (N) (Address 01h)
MSB
LSB MSB
LSB
N9 N8 N7 N6 N5 N4 N3 N2 N1 N0 X X X X X X
First Data Byte
Second Data Byte
X = Don’t care.
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