Silabs 公司的C8051F99x系列是超低功耗容性觸摸傳感的全集成混合信號(hào)系統(tǒng)級(jí)芯片（SoC）MCU，具有最低的功耗和最高的觸摸靈敏度，廣泛適用于容性按鈕，滑塊，容性接近檢測(cè)等。C8051F99x系列采用8051兼容的微控制器核，性能高達(dá)25MIPS，具有在系統(tǒng)全速非破壞性的調(diào)試接口和帶模擬復(fù)接器的10位300ksps或12位75ksps單端ADC，以及多達(dá)8kB的閃存和512B RAM，工作電壓1.8到3.6 V，主要用在儀表盤，觸摸屏，游戲系統(tǒng)，住宅區(qū)HVAC，家用電器，玩具，傳真機(jī)/打印機(jī)/掃描儀面板和工業(yè)接口等。本文介紹了C8051F99x-C8051F98x主要亮點(diǎn)和特性，方框圖和C8051F990滑塊評(píng)估板主要特性與電路圖。
C8051F99x-C8051F98x devices are fully integrated mixed-signal system-on-a-chip MCUs. Highlighted features are listed below.
C8051F99x-C8051F98x主要亮點(diǎn)：
Ultra low power consumption in active and sleep modes.
High-speed pipelined 8051-compatible microcontroller core (up to 25 MIPS)
In-system, full-speed, non-intrusive debug interface (on-chip)
10-bit 300 ksps or 12-bit 75 ksps single-ended ADC with analog multiplexer
6-bit programmable current reference (resolution can be increased with PWM)
Precision programmable 24.5 MHz internal oscillator with spread spectrum technology.
8 kB , 4 kB, or 2 kB of on-chip Flash memory
512 bytes of on-chip RAM
SMBus/I2C, Enhanced UART, and Enhanced SPI serial interfaces implemented in hardware
Four general-purpose 16-bit timers
Programmable counter/timer array (PCA) with three capture/compare modules and watchdog timer function
On-chip power-on reset, VDD monitor, and temperature sensor
One on-chip voltage comparator
Up to 14 Capacitive Touch (QuickSense™) Inputs
Up to 17 Port I/O
With on-chip power-on reset, VDD monitor, watchdog timer, and clock oscillator, the C8051F99x-C8051F98x devices are truly stand-alone system-on-a-chip solutions. The Flash memory can be reprogrammed even in-circuit, providing non-volatile data storage, and also allowing field upgrades of the 8051 firmware. User software has complete control of all peripherals, and may individually shut down any or all peripherals for power savings.
The on-chip Silicon Labs 2-Wire (C2) Development Interface allows non-intrusive (uses no on-chip resources), full speed, in-circuit debugging using the production MCU installed in the final application. This debug logic supports inspection and modification of memory and registers, setting breakpoints, single stepping, run and halt commands. All analog and digital peripherals are fully functional while debugging using C2. The two C2 interface pins can be shared with user functions, allowing in-system debugging without occupying package pins.
Each device is specified for 1.8 to 3.6 V operation over the industrial temperature range (–40 to +85 ℃). The Port I/O and RST pins are powered from the supply voltage. The C8051F99x-C8051F98x devices are available in 20-pin or 24-pin QFN or 24-pin QSOP packages. All package options are lead-free and RoHS compliant.
C8051F99x-C8051F98x主要特性:
Ultra Low Power Consumption
-150 μA/MHz in active mode (24.5 MHz clock)
-2 μs wakeup time
-10 nA sleep mode with memory retention
-50 nA sleep mode with brownout detector
-300 nA sleep mode with LFO
-600 nA sleep mode with external crystal
Supply Voltage 1.8 to 3.6 V
-Built-in LDO regulator allows a high analog supply voltage and low digital core voltage
-2 built-in supply monitors (brownout detector) for sleep mode and active modes
12-Bit or 10-Bit Analog to Digital Converter
-±1 LSB INL (10-bit mode); ±1.5 LSB INL (12-bit mode) no missing codes
-Programmable throughput up to 300 ksps (10-bit mode) or 75 ksps (12-bit mode)
-Up to 10 external inputs
-On-chip voltage reference; 0.5x gain allows measuring voltages up to twice the reference voltage
-16-bit auto-averaging accumulator with burst mode provides increased ADC resolution
-Data dependent windowed interrupt generator
-Built-in temperature sensor
Capacitive Sense Interface (F99x)
-Supports buttons, sliders, wheels, and capacitive proximity sensing
-Fast 40 μs per channel conversion time
-16-bit resolution, up to 14 input channels
-Auto scan and wake-on-touch
-Auto-accumulate up to 64x samples
Analog Comparator
-Programmable hysteresis and response time
-Configurable as wake-up or reset source
6-Bit Programmable Current Reference
-Up to ±500 μA, can be used as a bias or for generating a custom reference voltage
-PWM enhanced resolution mode
High-Speed 8051 μC Core
-Pipelined instruction architecture; executes 70% of instructions in 1 or 2 system clocks
-Up to 25 MIPS throughput with 25 MHz clock
-Expanded interrupt handler Memory
-512 bytes RAM
-8 kB (F990/1/6/7, F980/1/6/7), 4 kB (F982/3/8/9), or 2 kB (F985) Flash; in-system programmable
Digital Peripherals
-Up to 17 port I/O; high sink current and programmable drive strengthHardware SMBus™/I2C™, SPI™, and UART serial ports available concurrently
-Four general purpose 16-bit counter/timers
-Programmable 16-bit counter/timer array with three capture/compare modules and watchdog timer
Clock Sources
-Internal oscillators: 24.5 MHz, 2% accuracy supports UART operation; 20 MHz low power oscillator requires very little bias current.
-External oscillator: Crystal, RC, C, or CMOS Clock
-SmaRTClock oscillator: 32 kHz Crystal or internal
-Can switch between clock sources on-the-fly; useful in implementing various power saving modes
On-Chip Debug
-On-chip debug circuitry facilitates full-speed, non-intrusive in-system debug (no emulator required)
-Provides breakpoints, single stepping
-Inspect/modify memory and registers
-Complete development kit
Packages
-20-pin QFN (3 x 3 mm)
-24-pin QFN (4 x 4 mm)
-24-pin QSOP (easy to hand-solder)
Temperature Range: –40 to +85 ℃
C8051F99x 主要應(yīng)用：
Instrumentation panels
Touch panels
Kiosks
Gaming Systems
Industrial interface
Security
Residential HVAC
Home appliances
Toys
Keyboards
Fax/printer/scanner front panels
圖1。C8051F99x-C8051F98x方框圖
C8051F990滑塊評(píng)估板
The C8051F990 Slider Evaluation Kit demonstrates the system level possibilities that can be achieved when combining Silicon Laboratories QuickSense™ technology with the C8051F99x ultra low power capacitive sensing MCU. The result is a battery powered capacitive sensing solution that has the following features:
C8051F990滑塊評(píng)估板主要特性：
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Low Power Wake-on-Slide—Allows the system to be designed without any mechanical components. The system wakes up when the user slides a finger across the slider. The system has a shelf life of over 5 years in this low power wake-on-slide mode. For more information on how the wake-on-slide feature achieves gesture recognition in a low-power system, see "3.5. Wake-on-Slide Firmware Functionality" on page 3.
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QuickSense™ Slider Control—Allows multiple capacitive sensing pads to be bound together to form a slider control. The QuickSense API performs all required calculations and notifies the application software of the finger position on the slider. The slider demo demonstrates this capability and has a runtime of over 120 hours at the maximum LED setting. Runtime is limited by LED current and can be increased by dimming the LED.
Gesture Recognition—Quicksense™ events enable the ability to detect gestures, such as a “pinch”, on the slider. In this system, the “pinch” gesture is used to switch between different demonstration modes.
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Miniature Size—The C8051F990 MCU has a built in SmaRTClock oscillator (no crystal required) and is available in a 3x3 mm package. The sleep mode current is 300 nA and the active mode current is 150 μA/MHz.
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Battery Meter—Using the C8051F990’s 12-bit ADC, the system is able to measure the battery voltage and determine the remaining battery capacity.
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LED Dimmer—The system dynamically reduces LED power consumption by driving the LEDs with a PWM signal. Taking advantage of the fast 2 μs wake-up time, the MCU can efficiently wake up from sleep, adjust the state of the LED, and go back to sleep very efficiently. This allows a flicker-free, low power, LED dimming mode.
圖2。C8051F990滑塊評(píng)估板外形圖
圖3。C8051F990滑塊評(píng)估板電路圖
詳情請(qǐng)見：
http://www.silabs.com/products/mcu/capacitivesense/Pages/C8051F99x.aspx
和
http://www.silabs.com/Support%20Documents/TechnicalDocs/C8051F99x-Slider-EK.pdf
