ST采用ST7LNBx MCU的LNB电源控制方案
ST公司的STEVAL-CBL001V1是采用ST7LNBx MCU的LNB电源和控制. ST72F521和ST72521B MC有32K到60K双电压高密度闪存(HDFlash)或ROM,1K到2K RAM,具有14个中断矢量,多达64个I/O端口,通信接口包括SPI,SCI,I2C(SMbus V1.1兼容)和CAN接口.本文介绍了ST72F521和ST72521B MC主要特性,方框图以及STEVAL-CBL001V1演示板主要特性,详细电路图和所用材料清单(BOM).STEVAL-CBL001V1 Power supply and control for LNB based on ST7LNBx microcontroller
The ST72F521 and ST72521B devices are members of the ST7 microcontroller family designed for mid-range applications with a CAN bus interface (Controller Area Network).
All devices are based on a common industry standard 8-bit core, featuring an enhanced instruction set and are available with FLASH or ROM program memory.
Under software control, all devices can be placed in WAIT, SLOW, ACTIVE-HALT or HALT mode, reducing power consumption when the application is in idle or stand-by state.
The enhanced instruction set and addressing modes of the ST7 offer both power and flexibility to software developers, enabling the design of highly efficient and compact application code. In addition to standard 8-bit data management, all ST7 microcontrollers feature true bit manipulation, 8x8 unsigned multiplication and indirect addressing modes.
ST72F521和ST72521B主要特性:
■ Memories
– 32K to 60K dual voltage High Density Flash (HDFlash) or ROM with read-out protection capability. In-Application Programming and In-Circuit Programming for HDFlash devices
– 1K to 2K RAM
– HDFlash endurance: 100 cycles, data retention: 20 years at 55℃
■ Clock, Reset And Supply Management
– Enhanced low voltage supervisor (LVD) for main supply and auxiliary voltage detector
(AVD) with interrupt capability
– Clock sources: crystal/ceramic resonator oscillators, internal RC oscillator and bypass for external clock
– PLL for 2x frequency multiplication
– Four power saving modes: Halt, Active-Halt, Wait and Slow
■ Interrupt Management
– Nested interrupt controller
– 14 interrupt vectors plus TRAP and RESET
– Top Level Interrupt (TLI) pin
– 15 external interrupt lines (on 4 vectors)
■ Up to 64 I/O Ports
– 48 multifunctional bidirectional I/O lines
– 34 alternate function lines
– 16 high sink outputs
■ 5 Timers
– Main Clock Controller with: Real time base, Beep and Clock-out capabilities
– Configurable watchdog timer
– Two 16-bit timers with: 2 input captures, 2 output compares, external clock input on one timer, PWM and pulse generator modes
– 8-bit PWM Auto-Reload timer with: 2 input captures, 4 PWM outputs, output compare and time base interrupt, external clock with event detector
■ 4 Communications Interfaces
– SPI synchronous serial interface
– SCI asynchronous serial interface
– I2C multimaster interface (SMbus V1.1 compliant)
– CAN interface (2.0B Passive)
■ Analog periperal (low current coupling)
– 10-bit ADC with 16 input robust input ports
■ Instruction Set
– 8-bit Data Manipulation
– 63 Basic Instructions
– 17 main Addressing Modes
– 8 x 8 Unsigned Multiply Instruction
■ Development Tools
– Full hardware/software development package
– In-Circuit Testing capability
图1.ST72F521和ST72521B方框图
STEVAL-CBL001V1演示板
This demonstration board is used to program EEPROM data and to test ST7LNBx (0/1) microcontrollers on sockets or remotely using a coaxial cable (75 ohms), via DiSEqC commands.
The board has to be connected to the serial port of the PC (COMx).
The Windows HyperTerminal interface or the dedicated graphical interface (ST7LNB application downloadable at www.st.com/mcu and usable with Windows 2000 and XP) can be used to send commands.
STEVAL-CBL001V1演示板主要特性:
Ready-to-use programming and test board with user-friendly graphical user interface or windows hyper terminal
EEPROM data programming on-socket or via coaxial cable
DiSEqC command testing controlled by preprogrammed microcontroller and dedicated voltage regulator: full set of DiSEqC commands can be sent and replies evaluated
图1.STEVAL-CBL001V1演示板外形图
所用主要器件:
L78M05CDT
ST72521
LNBP15SP
ST232ECDR
图2.STEVAL-CBL001V1演示板电路图(1)
图3.STEVAL-CBL001V1演示板电路图(2)
STEVAL-CBL001V1演示板材料清单(BOM):
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