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DS1052 Datasheet(PDF) 2 Page - Dallas Semiconductor |
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DS1052 Datasheet(HTML) 2 Page - Dallas Semiconductor |
2 / 14 page DS1052 2 of 14 OPERATION Interface protocol is simplified to an 8-bit control byte and 8-bit data byte. Information can be read or written to the DS1052 including a commanded shutdown operation. Power-Up Configuration The DS1052 powers-up to half-scale (10000B) providing 50% duty-cycle. In this mode, the DS1052 can be used as a standalone oscillator of the frequency specified. Once powered, the PWM output can be changed via the 2-wire addressable serial port. Pin Description Vcc – Power supply terminal. The DS1052 will support operation from power supply voltages ranging from +2.7 volts to +5.5 volts. GND – Ground terminal. PWMO – Pulse-width modulated output. This output is a square-wave having amplitudes from 0 volts to VCC. The duty cycle of this output is governed by a 5-bit control register. Output duty cycles range from 0% to 96.88%. An additional command sequence will provide a 100% duty cycle or “full-on.” SCL – Serial clock input. SDA – Serial bi-directional data I/O. A0, A1, A2 – Device address (chip selects). 2-Wire Addressable Serial Port Control The 2-wire serial port interface supports a bi-directional data transmission protocol with device addressing. A device that sends data on the bus is defined as a transmitter, and a device receiving data as a receiver. The device that controls the message is called a “master.” The devices that are controlled by the master are “slaves.” The bus must be controlled by a master device that generates the serial clock (SCL), controls the bus access, and generates the START and STOP conditions. The DS1052 operates as a slave on the 2-wire bus. Connections to the bus are made via the open-drain I/O lines SDA and SCL. The following I/O terminals control the 2-wire serial port: SDA, SCL, A0, A1, and A2. A 2-wire serial port overview and timing diagrams for the 2-wire serial port can be found in Figures 2 and 5, respectively. Timing information for the 2-wire serial port is provided in the “AC Electrical Characteristics” table for 2-wire serial communications. |
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