Features: Memories
` Up to 4 Kbytes OTP
` 128 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.
` Power Saving features
Interrupts
` Up to 5 interrupt vectors
` Top Level External Interrupt (INT)
I/O Ports
` 19 I/O PINs configurable in Input and Output mode
` High current sink/source in all pins.
Peripherals
` 3 Programmable 8-bit Timer/PWMs with internal
16-bit Prescaler featuring:
PWM output
Input capture
Output compare
Pulse generator mode
` On-chip 8-bit Sample and Hold A/D Converter with 8-channel analog multiplexer (ST52T420/ E420 only)
` Watchdog timer
Development tools
` High level Software tools
` Emulator
` Low cost Programmer
` Gang Programmer
Pinout
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 |
Standard Output Source Sink current |
±16 |
| 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.DescriptionST52T410/ST52x420 are 8-bit Intelligent Control Units (ICU) of the ST Five Family, which can perform both boolean and fuzzy algorithms in an efficient manner, in order to reach the best performances that the two methodologies allow.
ST52T410/ST52x420 are produced by STMicroelectronics using the reliable high performance CMOS process, including integratedon- 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 allows for an interface with a wide range of external devices, like D/A converters or power control devices.
ST52T410/ST52x420 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 a divider (16 bit over 8 bit with 8 bit result and 8 bit remainder) are available to implement complex functions by using a single instruction. The program memory utilization and computational speed is optimized.
Fuzzy Logic dedicated structures in ST52T410/ ST52x420 ICU's can be exploited to model complex systems 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 per ipheral al lows 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.
ST52x420 includes an 8-bit Analog to Digital Converter with an 8-analog channel Multiplexer.Single/Multiple channels and Single/Sequence conversion modes are supported.
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 ST52T410/ST52x420.
The VISUAL FIVETM sof tware tool allows development of projects through a user-friendly graphical interface and optimization of generated code.
ST52T420 Data Sheet
