Pricing for the Busy Bee starts at $0.21 while the Sleepy Bee starts at $0.32. EFM8 starter kits are a low cost evaluation platform. The kits and chips are supported by Silicon Labs' Simplicity Studio. There are EXP expansion cards available to extend functionality. They include Silicon Labs' built-in advanced energy profiler as well as a flash programmer and debugger. 5) are available for $29 that highlight the different feature sets for each family. The digital peripheral complement is similar to the Busy Bee. There is a 12-bit, 20-channel ADC on-board. It has up to 64 Kbytes of flash and 2.3 Kbytes of RAM. The Universal Bee has a 48 MHz core to match the USB frequency. The Universal Bee incorporates a USB 2.0 interface that does not require an external crystal. The chip support USB BCS V1.2 integrated charger detection. The low-energy USB takes advantage of bus idle time to reduce power requirements. The USB support uses an internal oscillator. The latter only needs less than 1 ♚ for wake-on touch support. The system uses only 150 ♚/MHz and it has capacitive touch support. The Sleepy Bee has capacitive touch support in addition to ultra low power operating modes. It needs 300 nA with the real-time clock (RTC) running. The chip only needs 50 nA for sleep mode that provides full RAM retention and brown-out-detect (BoD) support. 3) has up to 64 Kbytes of flash and 4 Kbytes of RAM. The Busy Bee peripheral complement can operate in various modes designed to reduce power requirements. It is fully compatible with Silicon Labs' C8051F85x. The cross-bar I/O switch allows remapping of pins to provide the best access to peripherals and simplify board layout. There are two low-current comparators with DAC support. There are 12-bit, 200 Ksample/s or 10-bit, 800 Ksample/s ADCs. It has a pair of 3 Mbit/s UARTs with LIN slave “break and sync” auto-detection support, a 12 Mbit/s SPI, and 3.5 Mbit/s I 2C. It is available in packages as small as a 3 mm by 3 mm QFN20. It has up to 16 Kbytes of flash and 2 Kbytes of RAM. 2) targets consumer electronics, sensor, and motor control applications. Developers may easily write all the code that would be contained in one of these chip,s although there are plenty of libraries, stacks, and RTOS support options to simplify a developer's job. The chips do not have massive amounts of memory, but they are large enough for a wide range of applications. Low-power, low-cost, and easy-to-program solutions make these chips worth considering. In many ways, 8-bit platforms like the EFM8 are ideal for many Internet-of-Things (IoT) applications as well as conventional embedded applications like motor control and whitebox appliance support. EFM8 series is divided into three families that address low power and USB applications in addition to a high performance Busy Bee. Finally there is the Universal Bee with USB support that does not require an external crystal or regulator.įigure 1. Of course, performance is a tradeoff with a 25 MHz core. It sleeps a lot, consuming only 50 nA in sleep mode. The Busy Bee is the mainstay with a 50 MHz core. The EFM8 “Bee” series is divided into three families (Fig. Silicon Labs' latest 8051-based EFM8 microcontrollers highlights why that is not the case. Many will tell you that 8-bit microcontrollers are dead.
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