Ultralow power ARM-based 32-bit MCU with 384 Kbytes Flash ... - Keil

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Electrical characteristicsSTM32L162VD, STM32L162ZD, STM32L162QD, STM32L162RDTable 25. HSE 1-24 MHz oscillator characteristics (1)(2)Symbol Parameter Conditions Min Typ Max Unitf OSC_IN Oscillator frequency 1 24 MHzR F Feedback resistor 200 kΩCRecommended loadcapacitance versusequivalent serial resistanceof the crystal (R S ) (3)R S = 30 Ω 20 pFI HSEI DD(HSE)HSE driving currentHSE oscillator powerconsumptionV DD = 3.3 V, V IN = V SSwith 30 pF loadC = 20 pFf OSC = 16 MHzC = 10 pFf OSC = 16 MHzg m Oscillator transconductance Startup 3.53 mA2.5 (startup)0.7 (stabilized)2.5 (startup)0.46 (stabilized)mAmA/Vt SU(HSE)(4)Startup time V DD is stabilized 1 ms1. Resonator characteristics given by the crystal/ceramic resonator manufacturer.2. Based on characterization results, not tested in production.3. The relatively low value of the RF resistor offers a good protection against issues resulting from use in ahumid environment, due to the induced leakage and the bias condition change. However, it isrecommended to take this point into account if the MCU is used in tough humidity conditions.4. t SU(HSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 8 MHzoscillation is reached. This value is measured for a standard crystal resonator and it can vary significantlywith the crystal manufacturer.For C L1 and C L2 , it is recommended to use high-quality external ceramic capacitors in the5 pF to 25 pF range (typ.), designed for high-frequency applications, and selected to matchthe requirements of the crystal or resonator (see Figure 13). C L1 and C L2 are usually thesame size. The crystal manufacturer typically specifies a load capacitance which is theseries combination of C L1 and C L2 . PCB and MCU pin capacitance must be included (10 pFcan be used as a rough estimate of the combined pin and board capacitance) when sizingC L1 and C L2 . Refer to the application note AN2867 “Oscillator design guide for STmicrocontrollers” available from the ST website www.st.com.68/124 Doc ID 022268 Rev 2
STM32L162VD, STM32L162ZD, STM32L162QD, STM32L162RDElectrical characteristicsFigure 13.HSE oscillator circuit diagram 1. R EXT value depends on the crystal characteristics.Low-speed external clock generated from a crystal/ceramic resonatorThe low-speed external (LSE) clock can be supplied with a 32.768 kHz crystal/ceramicresonator oscillator. All the information given in this paragraph are based on characterizationresults obtained with typical external components specified in Table 26. In the application,the resonator and the load capacitors have to be placed as close as possible to the oscillatorpins in order to minimize output distortion and startup stabilization time. Refer to the crystalresonator manufacturer for more details on the resonator characteristics (frequency,package, accuracy).Table 26. LSE oscillator characteristics (f LSE = 32.768 kHz) (1)Symbol Parameter Conditions Min Typ Max Unitf LSELow speed external oscillatorfrequency32.768 kHzR F Feedback resistor 1.2 MΩC (2)Recommended load capacitanceversus equivalent serialresistance of the crystal (R S ) (3)1. Based on characterization, not tested in production.R S = 30 kΩ 8 pFI LSE LSE driving current V DD = 3.3 V, V IN = V SS 1.1 µAI DD (LSE)LSE oscillator currentconsumptionV DD = 1.8 V 450V DD = 3.0 V 600V DD = 3.6V 750g m Oscillator transconductance 3 µA/Vt (4)SU(LSE) Startup time V DD is stabilized 1 s2. Refer to the note and caution paragraphs below the table, and to the application note AN2867 “Oscillatordesign guide for ST microcontrollers”.3. The oscillator selection can be optimized in terms of supply current using an high quality resonator withsmall R S value for example MSIV-TIN32.768kHz. Refer to crystal manufacturer for more details;4. t SU(LSE) is the startup time measured from the moment it is enabled (by software) to a stabilized32.768 kHz oscillation is reached. This value is measured for a standard crystal resonator and it can varysignificantly with the crystal manufacturer.nADoc ID 022268 Rev 2 69/124
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STM32L162VD STM32L162ZDSTM32L162QD
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STM32L162VD, STM32L162ZD, STM32L162
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List of tablesSTM32L162VD, STM32L16
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Package characteristicsSTM32L162VD,
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Ordering information schemeSTM32L16
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Ultralow power ARM-based 32-bit MCU with 384 Kbytes Flash ... - Keil

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