LPC1751 NXP Semiconductors, LPC1751 Datasheet - Page 12

• Manufacturer Part Number: LPC1751
• Description: 32-bit ARM Cortex-M3 MCU; up to 512 kB flash and 64 kB SRAM
• Manufacturer: NXP Semiconductors

NXP Semiconductors
Table 3.
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[8]
LPC1759_58_56_54_52_51_4
Product data sheet
Symbol
V
V
V
V
VREFP
VREFN
VBAT
SSA
DD(3V3)
DD(REG)(3V3)
DDA
5 V tolerant pad providing digital I/O functions with TTL levels and hysteresis.
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.
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.
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).
5 V tolerant pad with 5 ns glitch filter providing digital I/O functions with TTL levels and hysteresis.
5 V tolerant pad with 20 ns glitch filter providing digital I/O function with TTL levels and hysteresis.
Pad provides special analog functionality.
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.
Pin description
Pin
9
21, 42,
56, 77
34, 67
8
10
12
16
…continued
Type
I
I
I
I
I
I
I
Description
analog ground: 0 V reference. This should nominally be the same voltage as V
but should be isolated to minimize noise and error.
3.3 V supply voltage: This is the power supply voltage for the I/O ports.
3.3 V voltage regulator supply voltage: This is the supply voltage for the on-chip
voltage regulator only.
analog 3.3 V pad supply voltage: This should be nominally the same voltage as
V
power the ADC and DAC. This pin should be tied to 3.3 V if the ADC and DAC are
not used.
ADC positive reference voltage: This should be nominally the same voltage as
V
as a reference for ADC and DAC. This pin should be tied to 3.3 V if the ADC and
DAC are not used.
ADC negative reference voltage: This should be nominally the same voltage as
V
a reference for ADC and DAC.
RTC pin power supply: 3.3 V on this pin supplies the power to the RTC
peripheral.
DD(3V3)
DDA
SS
but should be isolated to minimize noise and error. Level on this pin is used as
but should be isolated to minimize noise and error. Level on this pin is used
Rev. 04 — 26 January 2010
but should be isolated to minimize noise and error. This voltage is used to
LPC1759/58/56/54/52/51
32-bit ARM Cortex-M3 microcontroller
© NXP B.V. 2010. All rights reserved.
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