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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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K32L2AX датащи(PDF) 86 Page - NXP Semiconductors |
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K32L2AX датащи(HTML) 86 Page - NXP Semiconductors |
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86 / 96 page  MCU ADCx C R Input signal 1 2 Figure 26. RC circuit for ADC input High voltage measurement circuits require voltage division, current limiting, and overvoltage protection as shown the following figure. The voltage divider formed by R1 – R4 must yield a voltage less than or equal to VREFH. Typically, VREFH is connected to VDDA. The current must be limited to less than the negative injection current limit. Since the ADC pins do not have diodes to VDD, external clamp diodes must be included to protect against transient over-voltages. 5 5 4 4 3 3 2 2 1 1 D D C C B B A A EXTAL XTAL OSCILLATOR EXTAL XTAL OSCILLATOR EXTAL XTAL OSCILLATOR EXTAL XTAL OSCILLATOR EXTAL XTAL OSCILLATOR EXTAL XTAL OSCILLATOR MCU ADCx MCU ADCx MCU RESET_b MCU NMI_b MCU RESET_b Supervisor Chip OUT Active high, open drain RESET_b SWD_DIO SWD_CLK Analog input High voltage input RESET_b VDD VDD VDD VDD VDD VDD Drawing Title: Size Document Number Rev Date: Sheet of Page Title: ICAP Classification: FCP: FIUO: PUBI: SCH-XXXXX PDF: SPF-XXXXX X <Title> C Friday, February 06, 2015 <PageTitle> 1 1 ___ ___ X Drawing Title: Size Document Number Rev Date: Sheet of Page Title: ICAP Classification: FCP: FIUO: PUBI: SCH-XXXXX PDF: SPF-XXXXX X <Title> C Friday, February 06, 2015 <PageTitle> 1 1 ___ ___ X Drawing Title: Size Document Number Rev Date: Sheet of Page Title: ICAP Classification: FCP: FIUO: PUBI: SCH-XXXXX PDF: SPF-XXXXX X <Title> C Friday, February 06, 2015 <PageTitle> 1 1 ___ ___ X R 1 2 0.1uF R5 1 2 Cx 0.1uF RESONATOR 1 3 Cy Cx CRYSTAL 2 1 J1 HDR_5X2 1 2 3 4 6 5 7 8 9 10 Cy 10k 10k R4 CRYSTAL 2 1 0.1uF 10k CRYSTAL 2 1 R1 1 2 R3 1 2 C RESONATOR 1 3 R2 1 2 10k 10k RF 1 2 RS BAT54SW 1 2 RS RS C RF 1 2 RS 1 2 RF 1 2 CRYSTAL 2 1 Figure 27. High voltage measurement with an ADC input 9.1.4 Digital design Ensure that all I/O pins cannot get pulled above VDD (Max I/O is VDD+0.3V). CAUTION Do not provide power to I/O pins prior to VDD, especially the RESET_b pin. • High drive pins Design considerations 86 K32 L2A Microcontroller with 512 KB Flash and 128 KB SRAM, Rev. 3, 02/2021 NXP Semiconductors |
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