SM320F2812-HT

SGUS062A –JUNE 2009 –REVISED APRIL 2010

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6.6Reducing Current Consumption

28x DSPs incorporate a unique method to reduce the device current consumption. A reduction in current consumption can be achieved by turning off the clock to any peripheral module which is not used in a given application. Table 6-1indicates the typical reduction in current consumption achieved by turning off the clocks to various peripherals.

Table 6-1. Typical Current Consumption by Various Peripherals (at 150 MHz)(1)

 

(2)

 

 

 

PERIPHERAL MODULE

 

IDD CURRENT REDUCTION (mA)

eCAN

 

12

 

 

 

EVA

 

6

 

 

 

EVB

 

6

 

 

 

ADC

 

8(3)

SCI

 

4

 

 

 

SPI

 

5

 

 

 

McBSP

 

13

 

 

 

(1)All peripheral clocks are disabled upon reset. Writing to/reading from peripheral registers is possible only after the peripheral clocks are turned on.

(2)Not production tested.

(3)This number represents the current drawn by the digital portion of the ADC module. Turning off the clock to the ADC module results in the elimination of the current drawn by the analog portion of the ADC (ICCA) as well.

6.7Power Sequencing Requirements

SM320F2812 silicon requires dual voltages (1.8-V or 1.9-V and 3.3-V) to power up the CPU, Flash, ROM, ADC, and the I/Os. To ensure the correct reset state for all modules during power up, there are some requirements to be met while powering up/powering down the device. The current F2812 silicon reference schematics (Spectrum Digital Incorporated eZdsp. board) suggests two options for the power sequencing circuit.

Option 1:

In this approach, an external power sequencing circuit enables VDDIO first, then VDD and VDD1 (1.8 V or

1.9V). After 1.8 V (or 1.9 V) ramps, the 3.3 V for Flash (VDD3VFL) and ADC (VDDA1/VDDA2/AVDDREFBG) modules are ramped up. While option 1 is still valid, TI has simplified the requirement. Option 2 is the recommended approach.

Option 2:

Enable power to all 3.3-V supply pins (VDDIO, VDD3VFL, VDDA1/VDDA2/VDDAIO/AVDDREFBG) and thenramp

1.8V (or 1.9 V) (VDD/VDD1) supply pins.

1.8 V or 1.9 V (VDD/VDD1) should not reach 0.3 V until VDDIO has reached 2.5 V. This ensures the reset signal from the I/O pin has propagated through the I/O buffer to provide power-on reset to all the modules inside the device. See Figure 6-8 for power-on reset timing.

Power-Down Sequencing:

During power-down, the device reset should be asserted low (8 μs, minimum) before the VDD supply reaches 1.5 V. This helps to keep on-chip flash logic in reset prior to the VDDIO/VDD power supplies ramping down. It is recommended that the device reset control from Low-Dropout (LDO) regulators or voltage supervisors be used to meet this constraint. LDO regulators that facilitate power-sequencing (with the aid of additional external components) may be used to meet the power sequencing requirement. See www.spectrumdigital.com for F2812 eZdsp™ schematics and updates.

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Texas Instruments SM320F2812-HT Reducing Current Consumption, Power Sequencing Requirements, Peripheral Module

SM320F2812-HT specifications

The Texas Instruments SM320F2812-HT is a highly capable digital signal processor (DSP) specifically designed for high-performance and real-time applications in harsh environments. This part of the C2000 family of microcontrollers caters to applications in areas such as industrial automation, motor control, and power conversion, where reliability and durability under extreme temperature conditions are paramount.

One of the standout features of the SM320F2812-HT is its robust architecture based on a 32-bit fixed-point core. This allows for efficient execution of complex algorithms while maintaining a high processing speed. The processor operates at clock speeds of up to 150 MHz, enabling it to handle multiple tasks simultaneously with minimal latency.

The SM320F2812-HT boasts an impressive memory configuration that includes up to 128 KB of flash memory and 4 KB of RAM. The integrated memory supports efficient data handling and storage, making it ideal for demanding applications that require quick access to critical information. The device also features various peripherals, including analog-to-digital converters (ADCs), pulse width modulation (PWM) modules, and serial communication interfaces, which enhance its functionality in real-time processing and control tasks.

Furthermore, this DSP employs advanced control algorithms and supports various communication protocols, allowing it to interoperate seamlessly with other devices within a system. Its capabilities are further enhanced by Texas Instruments’ extensive development tools and software libraries, which enable developers to accelerate design cycles and improve overall efficiency.

With its high temperature rating, the SM320F2812-HT is designed to operate within a temperature range from -40°C to 125°C, making it particularly well-suited for use in automotive, aerospace, and other rugged environments where traditional components might fail. The high reliability and endurance of this microcontroller make it a preferred choice among engineers looking for durable solutions without compromising performance.

In summary, the Texas Instruments SM320F2812-HT represents a powerful blend of processing capabilities, memory architecture, and environmental resilience. Its features make it a go-to option for developers in search of a robust DSP for real-time applications, ensuring that it meets the rigorous demands of various industrial sectors while delivering consistent performance.