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PDF DS1085 Data sheet ( Hoja de datos )
| Número de pieza | DS1085 | |
| Descripción | EconOscillator Frequency Synthesizer | |
| Fabricantes | Dallas Semiconductor | |
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FEATURES
§ User-Programmable Frequency Synthesizer
§ Programmable From 8.1kHz to 133MHz
§ Dual Synchronous Outputs
§ 8.2MHz to 133MHz Reference Oscillator
Output
§ 8.1kHz to 133MHz Main Oscillator Output
§ Three Resolution Options
§ 2-Wire Serial Interface
§ 0.75% Absolute Accuracy
§ Nonvolatile (NV) Frequency Settings
§ Single 5V Supply
§ No External Timing Components
§ Power-Down Mode
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ORDERING INFORMATION
DEVICE
PACKAGE
DS1085Z-10
150mil SO
DS1085Z-25
150mil SO
DS1085Z-50
150mil SO
STEP
SIZE
10kHz
25kHz
50kHz
DS1085
EconOscillator Frequency Synthesizer
PIN ASSIGNMENT
OUT1
OUT0
VCC
GND
1
2
3
4
8 SCL
7 SDA
6 CTRL1
5 CTRL0
SO (150mil)
PIN DESCRIPTION
OUT1 - Main Oscillator Output
OUT0 - Reference Oscillator Output
VCC
GND
- Power-Supply Voltage
- Ground
CTRL1 - Control Pin for OUT1
CTRL0 - Control Pin for OUT0
SDA
- 2-Wire Serial Data Input/Output
SCL - 2-Wire Serial Clock
OSCILLATOR
OUTPUT RANGE
8.1kHz to 133MHz
8.1kHz to 133MHz
8.1kHz to 133MHz
DESCRIPTION
The DS1085 is a dual-output frequency synthesizer requiring no external timing components for
operation. It can be used as a standalone oscillator or as a dynamically programmed, processor-controlled
peripheral device. An internal master oscillator can be programmed from 66MHz to 133MHz with three
resolution options of 10kHz, 25kHz, and 50kHz. A programmable, 3-bit prescaler (divide-by-1, 2, 4, or 8)
permits the generation of a reference oscillator output (OUT0) from the master, ranging from 8.2MHz to
133MHz. A second independent prescaler and a 1-to-1025 divider allows the generation of a main
oscillator output (OUT1) from 8.1kHz to 133MHz. The two outputs, although synchronous with the
master, can be independently programmed. The combination of programmable master oscillator,
prescalers, and dividers allows the generation of thousands of user-specified frequencies. All master
oscillator, prescaler, and divider settings are stored in NV (EEPROM) memory, providing a default value
on power-up that allows it to be used as a standalone oscillator. A 2-wire serial interface allows in-circuit,
on-the-fly programming of the master oscillator, prescalers (P0 and P1), and divider (N). This allows
dynamic frequency modification, if required, or, for fixed-frequency applications, the DS1085 can be
used with factory- or user-programmed values.
EconOscillator is a trademark of Dallas Semiconductor.
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DS1085
REGISTER FUNCTIONS
The user-programmable registers can be used to determine the mode of operation (MUX), operating
frequency (DAC, OFFSET, DIV), and bus settings (ADDR). The functions of the registers are described
in this section, but details of how these registers are programmed can be found in a later section. The
register settings are nonvolatile, with the values being stored automatically or as required in EEPROM
when the registers are programmed through the SDA and SCL pins.
DAC WORD (Address 08h)
MSB
LSB MSB
LSB
d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 X X X X X X
First Data Byte
Second Data Byte
X = Don’t care.
The DAC word (d0–d9) controls the frequency of the master oscillator. The resolution of this register
depends on the step size of the device. The absolute frequency of the device also depends on the value of
the OFFSET register (see Table 5 and 6).
Table 5. DEFAULT DAC SETTINGS
DS1085Z-10
Frequency DAC
97.1MHz
500
Offset
OS
DS1085Z-25
Frequency DAC Offset
104.6MHz 600 OS
DS1085Z-50
Frequency DAC
101.8MHz
500
Offset
OS
For any given value of OFFSET the master oscillator frequency can be derived as follows:
Frequency = Min Frequency + DAC x Step Size
where: Min frequency is the lowest frequency shown in Table 6 for the corresponding offset.
DAC is the value of the DAC register (0–1023).
Step size is the step size of the device (10kHz, 25kHz, or 50kHz).
OS is the decimal, integer value of the five MSBs of the RANGE register.
OFFSET BYTE (Address 0Eh)
MSB
LSB
X X X O4 O3 O2 O1 O0
X = Don’t care.
The OFFSET byte (O0–O4) determines the range of frequencies that can be obtained within the absolute
minimum and maximum range of the oscillator. Correct operation of the device is not guaranteed for
values of OFFSET not shown in Table 6.
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Access RANGE [37h]
DS1085
If R/ W is 1, the next data bytes read are the values stored in the RANGE register. This register has a 14-
bit value. The upper eight bits are sent first, followed by a second byte that contains the five LSBs of the
register value in the most significant positions of the data byte. The upper five MSBs of the first byte
contain the OS value for the frequency adjust Table 6. The register is read-only.
Write E2 [3Fh]
If WC = 0, the EEPROM is automatically written to at the end of each write command. This is a
DEFAULT condition. In this case, the command “WRITE E2” is not needed. If WC = 1, the EEPROM is
only written to when the “WRITE E2” command is issued. On receipt of the “WRITE E2” command, the
contents of the DIV and MUX registers are written into the EEPROM, thus locking in the register
settings. This is a single-byte transfer.
EXCEPTION: The ADDR register is always automatically written to EEPROM after a write, regardless
of the value of WC.
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| PDF Descargar | [ Datasheet DS1085.PDF ] | |
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