STM32W108C8

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Description STM32W108C8 The STM32W108C8 offers a number of advanced power management features that enable long battery life. A high-frequency internal RC oscillator allows the processor core to begin code execution quickly upon waking. Various deep sleep modes are available with less than 1 µA power consumption while retaining RAM contents. To support user-defined applications, on-chip peripherals include UART, SPI, I 2 C, ADC and general-purpose timers, as well as up to 24 GPIOs. Additionally, an integrated voltage regulator, power-on-reset circuit, and sleep timer are available. 1.1 Development tools The STM32W108C8 implements both the ARM Serial Wire and JTAG debug interfaces. These interfaces provide real time, non-intrusive programming and debugging capabilities. Serial Wire and JTAG provide the same functionality, but are mutually exclusive. The Serial Wire interface uses two pins; the JTAG interface uses five. Serial Wire is preferred, since it uses fewer pins. The STM32W108C8 also integrates the standard ARM system debug components: Flash Patch and Breakpoint (FPB), Data Watchpoint and Trace (DWT), and Instrumentation Trace Macrocell (DWT). 11/215 Doc ID 018587 Rev 2
STM32W108C8 Description 1.2 Overview 1.2.1 Functional description The STM32W108C8 radio receiver is a low-IF, super-heterodyne receiver. The architecture has been chosen to optimize co-existence with other devices in the 2.4 GHz band (namely, WIFI and Bluetooth), and to minimize power consumption. The receiver uses differential signal paths to reduce sensitivity to noise interference. Following RF amplification, the signal is downconverted by an image-rejecting mixer, filtered, and then digitized by an ADC. The radio transmitter uses an efficient architecture in which the data stream directly modulates the VCO frequency. An integrated power amplifier (PA) provides the output power. Digital logic controls Tx path and output power calibration. If the STM32W108C8 is to be used with an external PA, use the TX_ACTIVE or nTX_ACTIVE signal to control the timing of the external switching logic. The integrated 4.8 GHz VCO and loop filter minimize off-chip circuitry. Only a 24 MHz crystal with its loading capacitors is required to establish the PLL local oscillator signal. The MAC interfaces the on-chip RAM to the Rx and Tx baseband modules. The MAC provides hardware-based IEEE 802.15.4 packet-level filtering. It supplies an accurate symbol time base that minimizes the synchronization effort of the software stack and meets the protocol timing requirements. In addition, it provides timer and synchronization assistance for the IEEE 802.15.4 CSMA-CA algorithm. The STM32W108C8 integrates an ARM® Cortex-M3 microprocessor, revision r1p1. This industry-leading core provides 32 bit performance and is very power efficient. It has excellent code density using the ARM® Thumb 2 instruction set. The processor can be operated at 12 MHz or 24 MHz when using the crystal oscillator, or at 6 MHz or 12 MHz when using the integrated high frequency RC oscillator. The STM32W108C8 has 64 Kbytes of Flash memory, 8 Kbytes of SRAM on-chip, and the ARM configurable memory protection unit (MPU). The STM32W108C8 contains 24 GPIO pins shared with other peripheral or alternate functions. Because of flexible routing within the STM32W108C8, external devices can use the alternate functions on a variety of different GPIOs. The integrated Serial Controller SC1 can be configured for SPI (master or slave), I 2 C (master-only), or UART operation, and the Serial Controller SC2 can be configured for SPI (master or slave) or I 2 C (master-only) operation. The STM32W108C8 has a general purpose ADC which can sample analog signals from six GPIO pins in single-ended or differential modes. It can also sample the regulated supply VDD_PADSA, the voltage reference VREF, and GND. The ADC has two selectable voltage ranges: 0 V to 1.2 V (normal) and 0.1 V to 0.1 V below the high voltage supply (high). The ADC has a DMA mode to capture samples and automatically transfer them into RAM. The integrated voltage reference for the ADC, VREF, can be made available to external circuitry. An external voltage reference can also be driven into the ADC. The STM32W108C8 contains four oscillators: a high frequency 24 MHz external crystal oscillator, a high frequency 12 MHz internal RC oscillator, an optional low frequency 32.768 kHz external crystal oscillator, and a 10 kHz internal RC oscillator. The STM32W108C8 has an ultra low power, deep sleep state with a choice of clocking modes. The sleep timer can be clocked with either the external 32.768 kHz crystal oscillator or with a 1 kHz clock derived from the internal 10 kHz RC oscillator. Alternatively, all clocks Doc ID 018587 Rev 2 12/215
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STM32W108C8 Index of registers TIMx
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STM32W108C8

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