Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsClock & Timing ICsSOIC 8 N

1 of 17 072701

FEATURES

§ Single 5-bit, programmable, pulse-width

modulator (PWM)

§ Adjustable Duty Cycle: 0% to 100%

§ 2.7V to 5.5V Operation

§ Standard Frequency Values:

1kHz, 5kHz, 10kHz, and 25kHz

§ 2-Wire Addressable Interface

§ Packages: 8-Pin (150-mil) SOIC and 8-Pin

(118-mil) mSOP

§ Operating Temperature: -40

C to +85

ORDERING INFORMATION

DS1050Z-001 1kHz 8-Pin 150-mil SOIC

DS1050Z-005 5kHz 8-Pin 150-mil SOIC

DS1050Z-010 10kHz 8-Pin 150-mil SOIC

DS1050Z-025 25kHz 8-Pin 150 mil SOIC

DS1050U-001 1kHz 8-Pin 118-mil mSOP

DS1050U-005 5kHz 8-Pin 118-mil mSOP

DS1050U-010 10kHz 8-Pin 118-mil mSOP

DS1050U-025 25kHz 8-Pin 118-mil

µSOP

PIN ASSIGNMENT

PIN DESCRIPTION

- 2.7V to 5.5V Power Supply

PWM

- PWM Ouput

A0, A1, A2 - Device Address

SDA - Serial Data I/O

SCL - Serial Clock Input

GND - Ground

DESCRIPTION

The DS1050 is a programmable, 5-bit, pulse-width modulator featuring a 2-wire addressable controlled

interface. The DS1050 operates from power supplies ranging from 2.7V up to 5.5V. The PWM output

provides a signal that swings from 0V to V

. The DS1050 requires a typical operating current of 50mA

and a programmable shutdown supply current of 1mA.

Four standard PWM output frequencies are offered and include 1kHz, 5kHz, 10kHz, and 25kHz. 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 potentiometers.

The device is ideal for low-cost LCD contrast and/or brightness control, power supply voltage

adjustment, and battery charging or current adjustment. The DS1050 is offered in standard integrated

circuit packaging including the 8-pin (150-mil) SOIC and space-saving 8-pin (118-mil) mSOP.

SCL

SDA

GND

PWM

8-Pin 150-mil SOIC

8-Pin 118-mil mSOP

DS1050

5-Bit, Programmable, Pulse-

Width Modulator: 1kHz, 5kHz, 10kHz, and 25kHz

www.maxim-ic.com

Summary of content (17 pages)

PAGE 1
DS1050 5-Bit, Programmable, PulseWidth Modulator: 1kHz, 5kHz, 10kHz, and 25kHz www.maxim-ic.com FEATURES § § § § § § § PIN ASSIGNMENT Single 5-bit, programmable, pulse-width modulator (PWM) Adjustable Duty Cycle: 0% to 100% 2.7V to 5.
PAGE 2
DS1050 OPERATION Interface protocol is simplified to an 8-bit control byte and 8-bit data byte. Information can be read or written to the DS1050 including a commanded shutdown operation. Power-Up Configuration The DS1050 powers-up to half-scale (10000B) providing 50% duty-cycle. In this mode, the DS1050 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.
PAGE 3
DS1050 The following bus protocol has been defined (see Figure 2). § Data transfer may be initiated only when the bus is not busy. § During data transfer, the data line must remain stable whenever the clock line is HIGH. Changes in the data line while the clock line is high will be interpreted as control signals. Accordingly, the following bus conditions have been defined: Bus not busy: Both data and clock lines remain HIGH.
PAGE 4
DS1050 The master device generates all serial clock pulses and the START and STOP conditions. A transfer is ended with a STOP condition or with a repeated START condition. Since a repeated START condition is also the beginning of the next serial transfer, the bus will not be released. The DS1050 may operate in the following two modes: 1. Slave receiver mode: Serial data and clock are received through SDA and SCL, respectively. After each byte is received, an acknowledge bit is transmitted.
PAGE 5
DS1050 The command operation “Set Shutdown Mode” is used to provide a low-current (inactive state) state for the DS1050. When in a low-current state the DS1050 will draw currents less than or equal to 1mA. The PWMO output will be high impedance. The command operation “Set Recall Mode” is used to recall the DS1050 from a low-current state. The value of the PWMO output is recalled to that prior to initiating a “Set shutdown mode” command.
PAGE 6
DS1050 or if the transaction is complete respond with the STOP condition. The 2-wire serial timing diagram is presented in Figure 5.
PAGE 7
DS1050 ABSOLUTE MAXIMUM RATINGS* Voltage on Any Pin Relative to Ground Operating Temperature Storage Temperature Soldering Temperature -0.3V to +6.0V -40oC to +85oC -55oC to +125oC See J-STD-020A specification * This is a stress rating only and functional operation of the device at these or any other conditions above those conditions indicated in the operation section of the specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.
PAGE 8
DS1050 AC ELECTRICAL CHARACTERISTICS (-40°C to +85°C; VCC = 2.7V to 5.5V) PARAMETER SCL Clock Frequency Bus Free Time Between STOP and START Condition Hold Time (Repeated) START Condition Low Period of SCL Clock High Period of SCL Clock Data Hold Time CONDITION Fast Mode Standard Mode Fast Mode Standard Mode MIN 0 0 1.3 4.
PAGE 9
DS1050 NOTES: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. All voltages are referenced to ground. ICC specified with outputs open. I/O pins of fast mode devices must not obstruct the SDA and SCL lines if VCC is switched off. Address Inputs, A0, A1, and A2, should be tied to either VCC or GND depending on the desired address selections. ISTBY specified for VCC between 3.0V and 5.0V, control port logic pins are driven to the appropriate logic levels.
PAGE 10
DS1050 BLOCK DIAGRAM Figure 1 vcc OSCILLATOR PWMO DRIVER CONTROL LOGIC SCL SDA A0 A1 A2 SHUTDOWN CONTROL CIRCUITRY Serial Port GND 2-WIRE ADDRESSABLE SERIAL PORT OVERVIEW Figure 2 SDA msb slave address r/w direction bit acknowledgement signal fromreceiver acknowledgement signal from receiver SCL 1 2 6 7 8 9 1 2 3-7 8 ACK Start Condition 9 ACK repeated if more bytes are transferred COMMAND/CONTROL BYTE Figure 3 msb 0 lsb 1 Device Identifier 0 1 A2 A1 A0 r/w Device Address
PAGE 11
DS1050 DS1050 COMMANDS AND PROTOCOL Figure 4 CONTROL BYTE MSB SET PWM DUTY CYCLE (a) S T A R T SS A T 0 1 0 1 A2 A1 A0 0 A R T SET SHUT-DOWN MODE (c) RECALL MODE (d) S T A R T MSB A C K 0 0 0 LSB S T O P PWM Data R/W=0 CONTROL BYTE MSB (b) LSB PWM DATABYTE 0 1 0 LSB 1 A2 A1 A0 0 PWM DATABYTE MSB A C K 0 0 1 LSB S T O P Don't Care R/W=0 CONTROL BYTE MSB S T A R T S T A R T 0 1 0 1 A2 A1 A0 0 MSB A C K 1 1 0 LSB S T O P Don't Care R/W=0 CONTROL BYTE MSB S T A R T L
PAGE 12
DS1050 2-WIRE SERIAL DIAGRAMS Figure 5 SDA t t BUF t t t F R t HD:STA SP LOW SCL t t HD:STA t STOP START HD:STA HIGH t t t SU:STA SU:DAT REPEATED START 12 of 17 SU:STO
PAGE 13
DS1050 TYPICAL OPERATING CHARACTERISTICS DS1050 (VCC = 5.0V; T = +25ºC, unless otherwise specified) DS1050 SUPPLY CURRENT vs. FREQUENCY 55 SUPPLY CURRENT (mA) 50 45 40 35 30 25 20 DS1050 Supply Current vs Freq, 3.3V DS1050 Supply Current vs Freq, 5V 15 10 0 5 10 15 20 25 30 FREQUENCY (kHz) DS1050 DUTY CYCLE vs. POSITION 100 90 DUTY CYCLE (%) 80 70 60 50 40 30 20 DS1050 Duty Cycle vs Position, 3.
PAGE 14
DS1050 TYPICAL OPERATING CHARACTERISTICS DS1050-001 (VCC = 5.0V, T = +25ºC, unless otherwise specified) D S1050-001 F R E Q U EN C Y vs. T E M P ER A T U R E 1.030 1.025 1.020 1.015 1.010 1.005 1.000 0.995 D S 1050-001 Freq vs T em p, 3.3V 0.990 D S 1050-001 Freq vs T em p, 5V 0.985 -40 -20 0 20 40 60 80 T EM PER A T U R E (C ) DS1050-001 SUPPLY CURRENT vs. TEMPERATURE 40 SUPPLY CURRENT (mA) 35 30 25 20 DS1050-001 Supply Current vs Temp, 3.
PAGE 15
DS1050 TYPICAL OPERATING CHARACTERISTICS DS1050-005 (VCC = 5.0V, T = +25ºC, unless otherwise specified) DS1050-005 FREQUENCY vs. TEMPERATURE 5.2 5.15 5.1 5.05 5 DS1050-005 Freq vs Temp, 3.3V DS1050-005 Freq vs Temp, 5V 4.95 -40 -20 0 20 40 60 80 TEMPERATURE (C) DS1050-005 SUPPLY CURRENT vs. TEMPERATURE 45 SUPPLY CURRENT (mA) 40 35 30 25 20 DS1050-005 Supply Current vs Temp, 3.
PAGE 16
DS1050 TYPICAL OPERATING CHARACTERISTICS DS1050-010 (VCC = 3V, T = +25ºC, unless otherwise specified) DS1050-010 FREQUENCY vs. TEMPERATURE 10.7 10.65 10.6 10.55 10.5 10.45 10.4 DS1050-010 Freq vs Temp, 3.3V 10.35 DS1050-010 Freq vs Temp, 5V 10.3 -40 -20 0 20 40 60 80 TEMPERATURE (C) DS1050-010 SUPPLY CURRENT vs. TEMPERATURE 50 SUPPLY CURRENT (mA) 45 40 35 30 25 20 DS1050-010 Supply Current vs Temp, 3.
PAGE 17
DS1050 TYPICAL OPERATING CHARACTERISTICS DS1050-025 (VCC = 5.0V; T = +25ºC, unless otherwise specified) DS1050-025 FREQUENCY vs. TEMPERATURE 26.8 26.6 26.4 26.2 26 25.8 25.6 DS1050-025 Freq vs Temp, 3.3V 25.4 DS1050-025 Freq vs Temp, 5V 25.2 -40 -20 0 20 40 60 80 TEMPERATURE (C) DS1050-025 SUPPLY CURRENT vs. TEMPERATURE 55 50 SUPPLY CURRENT (mA) 45 40 35 30 25 20 DS1050-025 Supply Current vs Temp, 3.