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LPC1751FBD80

32-bit ARM Cortex-M3 MCU; up to 512 kB flash and 64 kB SRAM with Ethernet, USB 2.0 Host/Device/OTG, CAN

NXP Semiconductors. 

NXP Semiconductors

LPC1759/58/56/54/52/51

32-bit ARM Cortex-M3 microcontroller

Table 4. Pin description …continued

Symbol

Pin

Type Description

XTAL1

19[9][10] I

Input to the oscillator circuit and internal clock generator circuits.

XTAL2

20[9][10] O

Output from the oscillator amplifier.

RTCX1

13[9][11] I

Input to the RTC oscillator circuit.

RTCX2

15[9]

O

Output from the RTC oscillator circuit.

VSS

24, 33, I

ground: 0 V reference.

43, 57,

66, 78

VSSA

9

I

analog ground: 0 V reference. This should nominally be the same voltage as VSS,

but should be isolated to minimize noise and error.

VDD(3V3)

21, 42, I

56, 77

3.3 V supply voltage: This is the power supply voltage for the I/O ports.

VDD(REG)(3V3)

34, 67 I

3.3 V voltage regulator supply voltage: This is the supply voltage for the on-chip

voltage regulator only.

VDDA

8

I

analog 3.3 V pad supply voltage: This should be nominally the same voltage as

VDD(3V3) but should be isolated to minimize noise and error. This voltage is used to

power the ADC and DAC. This pin should be tied to 3.3 V if the ADC and DAC are

not used.

VREFP

10

I

ADC positive reference voltage: This should be nominally the same voltage as

VDDA but should be isolated to minimize noise and error. Level on this pin is used

as a reference for ADC and DAC. This pin should be tied to 3.3 V if the ADC and

DAC are not used.

VREFN

12

I

ADC negative reference voltage: This should be nominally the same voltage as

VSS but should be isolated to minimize noise and error. Level on this pin is used as

a reference for ADC and DAC.

VBAT

16[11]

I

RTC pin power supply: 3.3 V on this pin supplies the power to the RTC

peripheral.

[1] 5 V tolerant pad providing digital I/O functions with TTL levels and hysteresis. This pin is pulled up to a voltage level of 2.3 V to 2.6 V.

[2] 5 V tolerant pad providing digital I/O functions (with TTL levels and hysteresis) and analog input. When configured as a ADC input,

digital section of the pad is disabled and the pin is not 5 V tolerant. This pin is pulled up to a voltage level of 2.3 V to 2.6 V.

[3] 5 V tolerant pad providing digital I/O with TTL levels and hysteresis and analog output function. When configured as the DAC output,

digital section of the pad is disabled. This pin is pulled up to a voltage level of 2.3 V to 2.6 V.

[4] Pad provides digital I/O and USB functions. It is designed in accordance with the USB specification, revision 2.0 (Full-speed and

Low-speed mode only). This pad is not 5 V tolerant.

[5] 5 V tolerant pad with 10 ns glitch filter providing digital I/O functions with TTL levels and hysteresis. This pin is pulled up to a voltage

level of 2.3 V to 2.6 V.

[6] 5 V tolerant pad with TTL levels and hysteresis. Internal pull-up and pull-down resistors disabled.

[7] 5 V tolerant pad with TTL levels and hysteresis and internal pull-up resistor.

[8] 5 V tolerant pad with 20 ns glitch filter providing digital I/O function with TTL levels and hysteresis.

[9] Pad provides special analog functionality. 32 kHz crystal oscillator must be used with the RTC.

[10] When the system oscillator is not used, connect XTAL1 and XTAL2 as follows: XTAL1 can be left floating or can be grounded (grounding

is preferred to reduce susceptibility to noise). XTAL2 should be left floating.

[11] When the RTC is not used, connect VBAT to VDD(REG)(3V3) and leave RTCX1 floating.

LPC1759_58_56_54_52_51

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 8.6 — 18 August 2015

© NXP Semiconductors N.V. 2015. All rights reserved.

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