Описание
The PIC14000 features include medium to high resolution A/D conversion (10 to 16 bits), temperature sensing, closed loop charge control, serial communication, and low power operation. The PIC14000 uses a RISC Harvard architecture CPU with separate 14-bit instruction and 8-bit data buses. A two-stage instruction pipeline allows all instructions to execute in a single cycle, except for program branches, which require two cycles. A total of 35 instructions are available. Additionally, a large register set is included. PIC16/17 microcontrollers typically achieve a 2:1 code compression and a 4:1 speed improvement over other 8-bit microcontrollers. Features: The PIC14000 is a 28-pin device with these features: 4K of EPROM 192 bytes of RAM 22 I/O pins The analog peripherals include: 8 external analog input channels, two with level shift inputs 6 internal analog input channels 2 comparators with programmable references A bandgap reference An internal temperature sensor A programmable current source In addition, the I2C serial port through a multiplexer supports two separate I2C channels. A special oscillator option allows either an internal 4 MHz oscillator or an external crystal oscillator. Using the internal 4 MHz oscillator requires no external components. The PIC14000 contains three timers, the Watchdog Timer (WDT), Timer0 (TMR0), and A/D Timer (ADTMR). The Watchdog Timer includes its own on-chip RC oscillator providing protection against software lock-up. TMR0 is a general purpose 8-bit timer/counter with an 8-bit prescaler. It may be clocked externally using the RC3/T0CKI pin. The ADTMR is intended for use with the slope A/D converter, but can also be used as a general purpose timer. It has an associated capture register which can be used to measure the time between events. An internal low-voltage detect circuit allows for tracking of voltage levels. Upon detecting the low voltage condition, the PIC14000 can be instructed to save its operating state then enter an idle state. The internal band-gap reference is used for calibrating the measurements of the analog peripherals. The calibration factors are stored in EPROM and can be used to achieve high measurement accuracy. Power savings modes are available for portable applications. The SLEEP and HIBERNATE modes offer different levels of power savings. The PIC14000 can wake up from these modes through interrupts or reset. A UV erasable CERDIP packaged version is ideal for code development, while the cost-effective One-Time Programmable (OTP) version is suitable for production in any volume. The PIC14000 fits perfectly in applications for battery charging, capacity monitoring, and data logging. The EPROM technology makes customization of application programs (battery characteristics, feature sets, etc.) extremely fast and convenient. The small footprint packages make this microcontroller based mixed signal device perfect for all applications with space limitations. Low-cost, low-power, high performance, ease of use and I/O flexibility make the PIC14000 very versatile in other applications such as temperature monitors/controllers.
- High-Performance RISC CPU:
- Only 35 single word instructions to learn
- All single cycle instructions except for program branches which are two cycle
- Operating speed: DC – 20 MHz clock input
- 4096 x 14 on-chip EPROM program memory
- 192 x 8 general purpose registers (SRAM)
- 6 internal and 5 external interrupt sources
- 38 special function hardware registers
- Eight-level hardware stack
- Analog Peripherals Features:
- Slope Analog-to-Digital (A/D) converter
- Eight external input channels including two channels with selectable level shift inputs
- Six internal input channels
- 16-bit programmable timer with capture register
- 16 ms maximum conversion time at maximum (16-bit) resolution and 4 MHz clock
- 4-bit programmable current source
- Internal bandgap voltage reference
- Factory calibrated with calibration constants stored in EPROM
- On-chip temperature sensor
- Voltage regulator control output
- Two comparators with programmable references
- On-chip low voltage detector
- Special Microcontroller Features:
- Power-on Reset (POR), Power-up Timer (PWRT) and Oscillator Start-up Timer (OST)
- Watchdog Timer (WDT) with its own on-chip RC oscillator for reliable operation
- Multi-segment programmable code-protection
- Selectable oscillator options
- Internal 4 MHz oscillator
- External crystal oscillator
- Serial in-system programming (via two pins)
- Digital Peripherals Features:
- 22 I/O pins with individual direction control
- High current sink/source for direct LED drive
- TMR0: 8-bit timer/counter with 8-bit programmable prescaler
- 16-bit A/D timer: can be used as a general purpose timer
- I2C serial port compatible with System Management Bus
- CMOS Technology:
- Low-power, high-speed CMOS EPROM technology
- Fully static design
- Wide-operating voltage range (2.7V to 6.0V)
- Commercial and Industrial Temperature Range
- Low power dissipation (typical)
- < 3 mA @5V, 4 MHz operating mode
- < 300 µA @3V (Sleep mode: clocks stopped with analog circuits active)
- < 5 µA @3V (Hibernate mode: clocks stopped, analog inactive, and WDT disabled)
