Industry's Smallest, Full-Function Supply Voltage Supervisor From TI Reduces Board Space and Power Consumption for Portable Applications
New Device Reduces Board Space by 50 Percent and Extends Battery Life
DALLAS, Aug. 4 /PRNewswire/ -- A new family of supervisory circuits from Texas Instruments (NYSE: TXN - news; TI) provides designers with the industry's first full-function Supply Voltage Supervisor (SVS) in a PicoGate package, which allows them to reduce board space and ease power consumption constraints while still maintaining a high level of system integrity. Designers can use this new supervisory circuit in Digital Signal Processors (DSPs), microcontrollers and microprocessors for portable applications, such as wireless communication devices, portable and battery powered equipment, and notebook computers. See www.ti.com/sc/aap2770u.
The new family of supervisory circuits, designated as the TPS3801 family, provides circuit initialization and timing supervision for DSPs, microcontrollers and microprocessors to ensure the reliable operation of the digital system. The TPS3801 joins TI's growing portfolio of supervisory circuits and can monitor the I/O voltages for all of TI's DSP platforms, as well as support a DSP that has a core voltage of 2.5 volt (V), such as TI's TMS320C6201 DSP.
''TI invented the SVS in the early 1980s and continues to lead the market by offering leading-edge supervisory circuits that address designers' needs for small, low-power products,'' said Markus Perger, systems engineer for TI's Power Management Products. ''The TPS3801 is the industry's first, full- function SVS device that is available in a 5-pin PicoGate package, which is about half the size of competing SVS devices available today.''
Industry's Smallest, Low-Power Supervisory Circuit
In portable applications, designers continually look for ways to integrate functions of devices so they can reduce the overall board space and power consumption. Optimized for portable applications, the TPS3801 is the industry's first, full-function SVS to come in a 5-pin SC-70 (SOT-323) package rather than the 5-pin, SOT-23 package of today's SVS devices. With this ultra-small package, designers can reduce their board space by 50 percent. The device also has a typical supply current rating of only 9 microAmperes, which eases the power consumption constraints and extends the battery life while still maintaining a high level of system integrity.
Device Offers Integrated Delay Time
Going beyond the simple Power Good (PG) type devices that are available on the market today, the TPS3801 includes a timer for generating a time delay. This functionality generates a delay time of 200 milli-seconds (ms) that allows the supply voltage to stabilize or gives the oscillator of the supervised processor enough time to settle. During power-on, RESET is asserted when the supply voltage becomes higher than 1.1V. Thereafter, the supervisory circuit monitors the supply voltage and keeps RESET active as long as the supply voltage remains below the threshold voltage. Due to its internal timer with a typical delay time of 200 ms, the device will delay the return of the output to the inactive state (high) to ensure proper system reset.
Capable of monitoring the supply voltage for 2.5V, 3.0V, 3.3V and 5.0V systems, the TPS3801 has a fixed-sense threshold voltage that is set by an internal voltage divider; therefore, the device does not require an external resistor divider. The device also incorporates a manual reset input (MR) that allows the operator to manually trigger a RESET of the system and force the system into a pre-defined state to restart. In addition, designers can use this MR input to daisy-chain multiple SVS devices, which gives additional flexibility when monitoring more than one supply voltage. A low level at MR causes RESET to become active.
Pricing and Availability
Devices in the TPS3801 supply voltage supervisor family are planned to be available in August from TI and its authorized distributors. Planned suggested resale pricing in quantities of 1,000 is listed in the following table:
Device Suggested 1,000-Piece Resale Price (planned)
TPS3801J25 $0.53
TPS3801L30 $0.53
TPS3801K33 $0.53
TPS3801I50 $0.53
More information about TI's portfolio of power management products is available on the World Wide Web at ti.com.
NOTE TO EDITORS: The worldwide leader and pioneer in digital signal processing solutions since 1982, Texas Instruments provides innovative DSP and mixed signal/analog technologies to more than 30,000 customers in the computer, wireless communications, networking, Internet, consumer, digital motor control and mass storage markets worldwide. To help customers get to market faster, TI offers easy-to-use development tools and extensive software and hardware support, further complemented by close to 300 third-party DSP solutions providers.
Texas Instruments Incorporated is a global semiconductor company and the world's leading designer and supplier of, digital signal processing and analog technologies, the engines driving and digitalization of electronics. Headquartered in Dallas, Texas, the company's business also include materials and controls, educational and productivity solutions, and digital imaging. The company has manufacturing or sales operations in more than 25 countries.
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