DS1085L Datasheet, PDF (9/21 Pages) Maxim Integrated Products – 3.3V EconOscillator Frequency Synthesizer

DS1085L
N
The DIV word sets the programmable divider. These 10 bits (N0–N9) determine the value of the
programmable divider (N). The range of divisor values is from two to 1025, and is equal to the
programmed value of N plus 2 (see Table 8).
Table 8. PROGRAMMABLE DIVISOR N VALUES
BIT VALUE
DIVISOR (N)
00000000 00XXXXXX
2*
00000000 01XXXXXX
3
—
—
—
—
—
—
—
—
11111111 11XXXXXX
1025
* Factory Default Setting
ADDR BYTE (Address 0Dh)
MSB
NAME —
—
—
Factory X
X
X
Default
X = Don’t care.
LSB
— WC A2 A1 A0
X
0
0
0
0
A0, A1, A2 (Default Setting = 000)
These device select bits determine the 2-wire address of the device.
WC (Default Setting = 0)
This bit determines when/if the EEPROM is written to after register contents have been changed. If
WC = 0, EEPROM is written automatically after a write register command. If WC = 1, EEPROM is only
written when the “WRITE” command is issued. In applications where the register contents are frequently
rewritten, WC should be set to 1; otherwise, it is necessary to wait for an EEPROM write cycle to
complete (up to 10ms) between writing to the registers. Regardless of the value of the WC bit, the value
of the ADDR register (A0, A1, A2) is always written immediately to the EEPROM.
RANGE REGISTER (Address 37h)
MSB
LSB
OS5 OS4 OS3 OS2 OS1 X X X X X X X X X X X
The first five bits of the RANGE register contain the default OFFSET value. The decimal value of the
RANGE register is the value OS that is referred to in Table 6. The RANGE register is read-only.
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