Features: Memories
` Up to 8 Kbytes EPROM/OTP
` 128/256 bytes of RAM
` Readout Protection
Core
` Register File Based Architecture
` 55 instructions
` Hardware multiplication and division
` Decision Processor for the implementation of Fuzzy Logic algorithms
Clock and Power Supply
` Up to 20 MHz clock frequency.
` On-chip Power On Reset (POR) and Brown Out Detector (BOD)
` Power Saving features
Interrupts
` 6 interrupt vectors
` Top Level External Interrupt (INT)
I/O Ports
` 13 or 21 I/O PINs configurable in Input and Output mode
` High current sink/source in all pins. Triac Driver output can supply 50 mA
Peripherals
` Programmable 8-bit Timer/PWMs with internal
16-bit Prescaler featuring:
PWM output
Input capture
Output compare
Pulse generator mode
` Watchdog timer
` 6-channels Analog Comparator with 16-bit
Timer (not available in ST52T400)
` Triac/PWM Driver Timer with zero crossing detector and high current capability for:
PWM mode
BurstMode
Phase Angle Partialization mode
Development tools
` High level Software tools
` Emulator
` Low cost Programmer
` Gang ProgrammerPinout
Specifications
| Symbol |
Ratings |
Maximum Value |
Unit |
| IVDD |
Total current in VDD power lines (source)3) |
100 |
mA |
| IVSS |
Total current in VSS ground lines (sink)3) |
100 |
| IIO |
Output current sunk by any standard I/O and control pin |
25 |
| |
Output current source by any I/Os and control pin |
-25 |
| IINJ(PIN) |
Injected current on VPP pin |
±5 |
| Injected current on RESET pin |
±5 |
| Injected current on OSCin and OSCout pins |
±5 |
| Injected current on any other pin 4) |
±5 |
| IINJ(PIN) |
Total Injected current (sum of all I/O and control pins) 4) |
±20 |
Stresses above those listed as "absolute maximum ratings" may cause permanent damage to the device. This is a stress rating only.
Functional operation of the device under these conditions is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.DescriptionST52x400/440/441 are 8-bit Intelligent Control Units (ICU) of the ST Five Family, which are able to perform both boolean and fuzzy algorithms in an efficient manner, in order to reach the best performances that the two methodologies allow.
ST52x400/440/441 is produced by STMicroelectronics using the reliable high performance CMOS process, including integrated-on-chip peripherals that allow maximization of system reliability, decreasing system costs and minimizing the number of external components.
The flexible I/O configuration of ST52x400/440/ 441 allows for an interface with a wide range of external devices, like D/A converters or power control devices.
ST52x400/440/441 pins are configurable, allowing the user to set the input or output signals on each single pin.
A hardware multiplier (8 bit by 8 bit with 16 bit result) and divider (16 bit over 8 bit with 8 bit result and 8 bit remainder) is available to implement complex functions by using a single instruction, optimizing program memory utilization and computational speed.
Fuzzy Logic dedicated structures in ST52x400/ 440/441 ICU's can be exploited to model complex sys tems with high accuracy in a useful and easy way.
Fuzzy Expert Systems for overall system management and fuzzy Real time Controls can be designed to increase performances at highly competitive costs.
The linguistic approach characterizing Fuzzy Logic is based on a set of IF-THEN rules, which describe the control behavior, as well as on Membership Functions, which are associated to input and output variables.
Up to 334 Membership Functions, with triangular and trapezoidal shapes, or singleton values are available to describe fuzzy variables.
The TIMER/PWM peripheral allows the management of power devices and timing signals, implementing different operating modes and high frequency PWM (Pulse With Modulation) controls.Input Capture and Output Compare functions are available on the TIMER.
The programmable Timer has a 16 bit Internal Prescaler and an 8 bit Counter. It can use internal or external START/STOP signals and clock.
An internal programmable WATCHDOG is available to avoid loop errors and to reset the ICU.
An Analog Comparator with a 6 channel multiplexer is available on ST52x440/441 family devices. This analog peripheral allows easy implementation of a high resolution A/D conversion. By using only an external capacitor this peripheral may be configured in order to achieve up to 12 bit A/D converter resolution. It includes a 2.5 V bandgap reference for A/D conversion calibration, which can be used externally for signal conditioning.
An on-chip TRIAC driver peripheral allows the direct management of power devices, implementing two different operating modes: Burst Mode (i.e. Thermal Applications), Phase Angle Partialization (i.e. Motors Control by Triacs). The TRIAC Driver also generates a PWM signal.
The ST52x400/440/441 family also includes an on-chip Power-on-Reset (POR), which provides an internal chip reset during power up situation and a Brown-Out Detector (BOD), which resets the ICU if the voltage source VDD dips below a minimum value.
In order to optimize energy consumption, two different power saving modes are available: Wait mode and Halt mode.
Program Memory (EPROM/OTP) addressing capability addresses up to 8 Kbytes of memory locations to store both program instructions and permanent data.
EPROM can be locked by the user to prevent external undesired operations.
Operations may be performed on data stored in RAM, allowing the direct combination of new input and feedback data. All bytes of RAM are used like Register File.
OTP (One Time Programmable) version devices are fully compatible with the EPROM windowed version, which may be used for prototyping and pre-production phases of development.
A powerful development environment consisting of a board and software tools allows an easy configuration and use of ST52x400/440/441.
The VISUAL FIVETM software tool allows development of projects through a user-friendly graphical interface and optimization of generated code.
ST52T441 Data Sheet
