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LPC11U35FHI33 Datasheet(PDF) 60 Page - NXP Semiconductors |
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LPC11U35FHI33 Datasheet(HTML) 60 Page - NXP Semiconductors |
60 / 76 page LPC11U3X All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved. Product data sheet Rev. 2 — 25 November 2013 60 of 76 NXP Semiconductors LPC11U3x 32-bit ARM Cortex-M0 microcontroller Under nominal operating condition VDD = 3.3 V and with the maximum sampling frequency fs = 400 kHz, the parameters assume the following values: Cia = 1 pF (max) Rmux = 2 kΩ (max) Rsw = 1.3 kΩ (max) Cio = 7.1 pF (max) The effective input impedance with these parameters is Rin = 308 kΩ. 11.7 ADC usage notes The following guidelines show how to increase the performance of the ADC in a noisy environment beyond the ADC specifications listed in Table 6: • The ADC input trace must be short and as close as possible to the LPC11U3x chip. • Shield The ADC input traces from fast switching digital signals and noisy power supply lines. • The ADC and the digital core share the same power supply. Therefore, filter the power supply line adequately. • To improve the ADC performance in a noisy environment, put the device in Sleep mode during the ADC conversion. 11.8 I/O Handler software library applications The following sections provide application examples for the I/O Handler software library. All library examples make use of the I/O Handler hardware to extend the functionality of the part through software library calls. The libraries are available on http://www.LPCware.com. 11.8.1 I/O Handler I2S The I/O Handler software library provides functions to emulate an I2S master transmit interface using the I/O Handler hardware block. The emulated I2S interface loops over a 1 kB buffer, transmitting the datawords according to the I2S protocol. Interrupts are generated every time when the first 512 bytes have been transmitted and when the last 512 bytes have been transmitted. This allows the ARM core to load the free portion of the buffer with new data, thereby enabling streaming audio. Two channels with 16-bit per channel are supported. The code size of the software library is 1 kB and code must be executed from the SRAM1 memory area reserved for the I/O Handler code. 11.8.2 I/O Handler UART The I/O Handler UART library emulates one additional full-duplex UART. The emulated UART can be configured for 7 or 8 data bits, no parity, and 1 or 2 stop bits. The baud rate is configurable up to 115200 baud. The RXD signal is available on three I/O Handler pins (IOH_6, IOH_16, IOH_20), while TXD and CTS are available on all 21 I/O Handler pins. The code size of the software library is about 1.2 kB and code must be executed from the SRAM1 memory area reserved for the I/O Handler code. |
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