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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LPC55S2X датащи(PDF) 39 Page - NXP Semiconductors |
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LPC55S2X датащи(HTML) 39 Page - NXP Semiconductors |
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39 / 132 page  LPC55S2x/LPC552x All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2021. All rights reserved. Product data sheet Rev. 2.1 — 6 August 2021 39 of 132 NXP Semiconductors LPC55S2x/LPC552x 32-bit ARM Cortex-M33 microcontroller 6.1.1 Termination of unused pins Table 4 shows how to terminate pins that are not used in the application. In many cases, unused pins should be connected externally or configured correctly by software to minimize the overall power consumption of the part. Unused pins with GPIO function should be configured as outputs set to LOW with their internal pull-up disabled. To configure a GPIO pin as output and drive it LOW, select the GPIO function in the IOCON register, select output in the GPIO DIR register, and write a 0 to the GPIO PORT register for that pin. Disable the pull-up in the pin’s IOCON register. In addition, it is recommended to configure all GPIO pins that are not bonded out on smaller packages as outputs driven LOW with their internal pull-up disabled. [1] I = Input, IA = Inactive (no pull-up/pull-down enabled), PU = Pull-Up enabled Table 4. Termination of unused pins Pin Default state[1] Recommended termination of unused pins RESET I; PU The RESET pin can be left unconnected if the application does not use it. all PIOn_m (not open-drain) I; PU Can be left unconnected if driven LOW and configured as GPIO output with pull-up or pull-down disabled by software. PIOn_m (I2C open-drain) IA Can be left unconnected if driven LOW and configured as GPIO output by software. XTAL32K_P - Connect to ground. When grounded, the RTC oscillator is disabled. XTAL32K_N - Can be left unconnected. XTAL32M_P - Connect to ground. When grounded, the RTC oscillator is disabled. XTAL32M_N - Can be left unconnected. VREFP - Tie to VBAT_DCDC. VREFN - Tie to VSS. VDDA - Tie to VBAT_DCDC. VSSA - Tie to VSS. USBn_DP F Can be left unconnected. USBn_DM F Can be left unconnected. USBn_3V3 F Tie to VBAT_DCDC. If not using USB and using 1.8 V supply, USBn_3V3 can be connected to 1.8 V. USB1_VBUS F Can be left unconnected. USBn_VSS F Tie to VSS. |
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