The ADuCM361 contains all the features of the ADuCM360 except the primary ADC, ADC0 is not available – only the auxiliary ADC, ADC1 is available.
The device contains an on-chip 32 KHz oscillator and an internal 16MHz high-frequency oscillator. This clock is routed through a programmable clock divider from which the MCU core clock operating frequency is generated. The maximum core clock speed is 16MHz and this is not limited by operating voltage or temperature.
The microcontroller core is a low power Cortex-M3 core from ARM. It is a 32-bit RISC machine, offering up to 20 MIPS peak performance. The Cortex-M3 MCU incorporates a flexible 11-channel DMA controller supporting all wired (SPI, UART, I2C) communication peripherals. 128k Bytes of non-volatile Flash/EE and 8k Bytes of SRAM are also integrated on-chip.
The Analog sub-system consists of dual ADCs each connected to a flexible input MUX. Both ADCs can operate in fully differential and single ended modes. Other on-chip ADC features include dual programmable excitation current sources, burn-out current sources and a bias voltage generator of AVDD_REG/2 (900mV) to set the common-mode voltage of an input channel. A low-side internal ground switch is provided to allow powering down of a bridge between conversions. The ADCs contain two parallel filters – a Sinc3 or Sinc4 in parallel with a Sinc2.
The Sinc3 or Sinc4 filter is for precision measurements. The Sinc2 filter is for fast measurements and for detection of step changes in the input signal The device also contains a low noise, low drift internal band-gap reference or can be configured to accept up to 2 external reference sources in ratiometric measurement configurations. An option to buffer the external reference inputs is also provided on-chip. A single-channel buffered voltage output DAC is also provided on chip. The ADuCM360/ADuCM361 also integrates a range of on-chip peripherals which can be configured under microcontroller software control as required in the application. These peripherals include UART, I2C and dual SPI Serial I/O communication controllers, 19-Pin GPIO Ports, 2 General Purpose Timers, Wake-up Timer and System Watchdog Timer. A 16-bit PWM with six output channels is also provided.
The ADuCM360/ADuCM361 is specifically designed to operate in battery powered applications where low power operation is critical. The microcontroller core can be configured in a normal operating mode consuming 290μA/MHz (including Flash/SRAM Idd) resulting in an overall system current consumption of 1mA when all peripherals are active.
The part can also be configured in a number of low power operating modes under direct program control, including hibernate mode (internal wake-up timer active) consuming only 4μA. In hibernate mode, peripherals such as external interrupts or the internal wake up timer can wake up the device. This allows the part to operate in an ultra-low power operating mode and still respond to asynchronous external or periodic events.
On-chip factory firmware supports in-circuit serial download via a serial wire interface (2-pin JTAG system) and UART while non-intrusive emulation is also supported via the serial wire interface. These features are incorporated into a low-cost QuickStart Development System supporting this Precision Analog Microcontroller family.
The part operates from an external 1.8V to 3.6V voltage supply and is specified over an industrial temperature range of -40℃ to 125℃.
ADuCM360主要特性:
Analog Input/Output
Dual (24-bit) ADCs (ADuCM360)
Single (24-bit) ADC (ADuCM361)
Single Ended and fully Differential inputs
Programmable ADC output rate (4 Hz to 4 kHz)
Simultaneous 50Hz/60Hz rejection
50SPS Continuous Conversion Mode
16.67SPS Single Conversion Mode
Flexible input MUX for input channel selection to both ADCs
Primary and Auxiliary (24-bit) ADC channel
6 differential or 11 Single-Ended input channels
4 internal channels for monitoring DAC, Temperature sensor, IOVDD and AVDD (ADC1 only)
Programmable Gain (1 to 128)
Selectable input range: ±6.64 mV to ±1.2 V
RMS noise: 43nV @3.75Hz, 180nV @ 50Hz
Programmable sensor excitation current sources
10/50/100/150/200/250/300/400/500/600/800uA and 1mA current source options
On-chip precision Voltage reference (±4 ppm/℃)
Single 12-bit voltage output DAC
NPN mode for 4-20mA loop applications
Microcontroller
ARM Cortex™M3 32-bit processor Serial Wire download and debug Internal Watch crystal for wakeup timer 16
MHz Oscillator with 8-way Programmable Divider
Memory 128k Bytes Flash/EE Memory, 8k Bytes SRAM In-circuit debug/download via Serial Wire and UART
为便携设备供电的创新型双输出LDO电源解决方案性能提高效率的措施包括同步整流、采用脉频调制PFM模式、最大限度降低RDSon功耗和先进的内部启用/禁用策略。同步整流用于降低二极管D前向电压而产生的功耗（见图1），在二次循环期间，NMOS晶体管短接 关于L6599 过流电路这是个L6599的过流电路，通过一个电容采样，我像问下，我标注的那两个RC是起到什么作用的。 QQ截图20201016160437.png(45.18 KB, 下载次数: 0)下载 电容电压单元如何进行飞法电容测量？半导体电容一般是皮法 （pF） 级或纳法（nF） 级。许多商用 LCR 或电容表可以使用适当的测量技术测量这些值，包括补偿技术。但是，某些应用要求飞法 （fF） 或 1e-15 级的非常灵敏的电容测
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