PDF DS1077 Data sheet ( Hoja de datos )

Número de pieza	DS1077
Descripción	EconOscillator/Divider
Fabricantes	Dallas Semiconducotr
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No Preview Available ! www.maxim-ic.com FEATURES § Processor-controlled or standalone solid- state oscillator § Frequency changes on-the-fly § Dual low-jitter, synchronous fixed frequency outputs § 2-wire serial interface § Frequency outputs 8.1kHz to 133MHz § ±0.5% variation over temp (+25°C to +70°C) § ±0.5% initial tolerance § Nonvolatile (NV) frequency settings § Single 5V supply § No external components § Power-down mode § Synchronous output gating STANDARD FREQUENCY OPTION Note: x denotes package option DS1077x-133 133.333MHz to 16.2kHz DS1077x-125 125.000MHz to 15.2kHz DS1077x-120 120.000MHz to 14.6kHz DS1077x-100 100.000MHz to 12.2kHz DS1077x-66 66.666MHz to 8.1kHz DS1077 EconOscillator/Divider PIN ASSIGNMENT OUT1 OUT0 VVCDCD GND 1 2 3 4 8 SCL 7 SDA 6 CTRL1 5 CTRL0 150mil SO 118mil µSOP Package PIN DESCRIPTION OUT1 - Main Oscillator Output OUT0 - Reference 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 ORDERING INFORMATION Note: XXX denotes frequency option DS1077Z-XXX 8-Pin 150mil SO DS1077U-XXX 8-Pin 118mil µSOP DESCRIPTION The DS1077 is a dual-output, programmable, fixed-frequency oscillator requiring no external components for operation. The DS1077 can be used as a processor-controlled frequency synthesizer or as a standalone oscillator. The two synchronous output operating frequencies are user-adjustable in submultiples of the master frequency through the use of two on-chip programmable prescalers and a divider. The specific output frequencies chosen are stored in NV (EEPROM) memory. The DS1077 defaults to these values upon power-up. The DS1077 features a 2-wire serial interface that allows in-circuit on-the-fly programming of the programmable prescalers (P0 & P1) and divider (N) with the desired values being stored in NV (EEPROM) memory. Design changes can be accommodated in-circuit on-the-fly by simply programming different values into the device (or reprogramming previously programmed devices). Alternatively, for fixed frequency applications, previously programmed devices can be used and no connection to the serial interface is required. Pre-programmed devices can be ordered in customer- requested frequencies. The DS1077 is available in 8-pin SO or µSOP packages, allowing the generation of a clock signal easily, economically, and using minimal board area. Chip-scale packaging is also available on request. EconOscillator is a trademark of Dallas Semiconductor. 1 of 21 011006 1 page SHUTDOWN CONTROL WITH PDN0 AND PDN1 Table 3 PDN0 PDN1 SHUTDOWN CONTROL (BIT) (BIT) 00 NONE* 01 CTRL1 10 CTRL0 11 CTRL0 OR CTRL1 CTRL0 performs a power-down if SEL0 and EN0 are both 0 (see Table 1). DS1077 REGISTER FUNCTIONS The user programmable registers can be programmed by the user to determine the mode of operation (MUX), operating frequency (DIV), and bus settings (BUS). Details of how these registers are programmed can be found in a later section; in this section the functions of the registers are described. The register settings are nonvolatile, the values being stored automatically or as required in EEPROM when the registers are programmed via the SDA and SCL pins. MUX WORD MSB LSB MSB LSB Name PDN1 PDN0 SEL0 EN0 0M1 0M0 1M1 1M0 DIV1 - - - - - - Default 0 0 0 1 1 0 0 0 0 0 x xx x xx setting first data byte second data byte This bit must be set to zero. DIV1 (bit) This bit allows the output of the Prescaler P1 to be routed directly to the OUT1 pin (DIV1 = 1). The N divider is bypassed so the programmed value of N is ignored. If DIV1 = 0 (default) the N divider functions normally. 0M1, 0M0, 1M1, 1M0 (bits) These bits set the prescalers P0 and P1, to divide by 1, 2, 4, or 8 (see Table 4). PRESCALER DIVISOR M SETTINGS Table 4 Prescaler Prescaler 0M1 0M0 P0 Divisor 1M1 1M0 P1 Divisor “M” “M” 00 1* 0 0 1 0 1 2 01 2 1 0 4 10 4 11 Default Condition 8 11 8 5 of 21 5 Page 2-WIRE SERIAL COMMUNICATION WITH DS1077 Figure 3 Send a “Standalone” Command SCL SDA S 1 0 1 1 A2 A1 A0 W A C7 C6 C5 C4 C3 C2 C1 C0 A P Start Address Byte Write MSB of a Two-Byte Register DS1077 ACK Command Byte DS1077 Stop ACK SCL SDA S 1 0 1 1 A2 A1 A0 W A C7 C6 C5 C4 C3 C2 C1 C0 A D7 D6 D5 D4 D3 D2 D1 D0 A P Start Address Byte Write to a Two-Byte Register DS1077 ACK Command Byte DS1077 ACK MSByte DS1077 Stop ACK SCL SDA S 1 0 1 1 A2 A1 A0 W A C7 C6 C5 C4 C3 C2 C1 C0 A D7 D6 D5 D4 D3 D2 D1 D0 A D7 D6 D5 D4 D3 D2 D1 D0 A P Start Address Byte DS1077 ACK Command Byte Write a Single Byte to an Addressed Register DS1077 ACK MSByte DS1077 ACK LSByte DS1077 Stop ACK SCL SDA S 1 0 1 1 A2 A1 A0 W A C7 C6 C5 C4 C3 C2 C1 C0 A A7 A6 A5 A4 A3 A2 A1 A0 A D7 D6 D5 D4 D3 D2 D1 D0 A P Start Control Byte DS1077 ACK Command Byte Write Multiple Bytes to an Addressed Register DS1077 ACK Byte Address DS1077 ACK Data Byte DS1077 Stop ACK SCL SDA S 1 0 1 1 A2 A1 A0 W A C7 C6 C5 C4 C3 C2 C1 C0 A A7 A6 A5 A4 A3 A2 A1 A0 A D7 D6 D5 D4 D3 D2 D1 D0 A Start SCL SDA Control Byte DS1077 ACK Command Byte DS1077 Starting Byte Address DS1077 ACK ACK D7 D6 D5 D4 D3 D2 D1 D0 A D7 D6 D5 D4 D3 D2 D1 D0 A P Byte n DS1077 ACK Byte (n+1) DS1077 ACK Byte N DS1077 Stop ACK 11 of 21 DS1077 11 Page

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