Pulse-Width Modulator. DS1052 Datasheet
5-Bit, Programmable, 100kHz
§ Single 5-bit, programmable, pulse-width
§ Adjustable Duty Cycle: 0% to 100%
§ 2.7V to 5.5V Operation
§ Standard Frequency Value: 100kHz
§ 2-Wire Addressable Interface
§ Packages: 8-Pin (150-mil) SOIC and 8-Pin
§ Operating Temperature: -40oC to +85oC
100kHz 8-Pin 150-mil SOIC
DS1052U-100 100kHz 8-Pin 118-mil mSOP
8-Pin 150-mil SOIC
8-Pin 118-mil mSOP
A0, A1, A2
- 2.7V to 5.5V Power Supply
- PWM Ouput
- Device Address
- Serial Data I/O
SCL - Serial Clock Input
The DS1052 is a programmable, 5-bit, pulse-width modulator featuring a 2-wire addressable controlled
interface. The DS1052 operates from power supplies ranging from 2.7V up to 5.5V. The PWM output
provides a signal that swings from 0V to VCC.
The DS1052-100 requires a typical operating current of 100µA and a programmable shutdown supply
current of 1µA.
One standard PWM output frequency is offered: 100kHz. The 2-wire addressable interface allows
operation of multiple devices on a single 2-wire bus and provides compatibility with other Dallas
Semiconductor 2-wire devices such as real-time clocks (RTCs), digital thermometers, and digital
The device is ideal for low-cost LCD contrast and/or brightness control, power supply voltage
adjustment, and battery charging or current adjustment. The DS1052 is offered in standard integrated
circuit packaging, including the 8-pin (150-mil) SOIC and space-saving 8-pin (118-mil) mSOP.
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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.
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.
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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