LPC1786 datasheet(35/117 Pages) NXP

35 / 117 page

LPC178X_7X

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Objective data sheet

Rev. 2 — 27 May 2011

35 of 117

NXP Semiconductors

LPC178x/7x

32-bit ARM Cortex-M3 microcontroller

[1]

PU = internal pull-up enabled (for VDD(REG)(3V3) = 3.3 V, pulled up to 3.3 V); IA = inactive, no pull-up/down enabled; F = floating; floating

pins, if not used, should be tied to ground or power to minimize power consumption.

VDD(REG)(3V3)

26,

86,

174

H4,

P11,

D11

G1,

N9,

18,

60,

121

3.3 V regulator supply voltage: This is the power supply for

the on-chip voltage regulator that supplies internal logic.

VDDA

Analog 3.3 V pad supply voltage: This can be connected to

the same supply as VDD(3V3) but should be isolated to minimize

noise and error. This voltage is used to power the ADC and

DAC. Note: this pin should be tied to 3.3V if the ADC and

DAC are not used.

VDD(3V3)

15,

60,

71,

89,

112,

125,

146,

165,

181,

198

G3,

P6,

P8,

U13,

P17,

K16,

C17,

B13,

C9,

E2,

L4,

K8,

L11,

J14,

E12,

E10,

41,

62,

77,

102,

114,

138

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

other than pins in the VBAT domain.

VREFP

ADC positive reference voltage: This should be the same

voltage as VDDA, but should be isolated to minimize noise and

error. The voltage level on this pin is used as a reference for

ADC and DAC. Note: this pin should be tied to 3.3V if the

ADC and DAC are not used.

VSS

33,

63,

77,

93,

114,

133,

148,

169,

189,

200

L3,

T5,

R9,

P12,

N16,

H14,

E15,

A12,

B6,

H4,

P4,

L9,

L13,

G13,

D13,

C11,

44,

65,

79,

103,

117,

139

Ground: 0 V reference for digital IO pins.

VSSREG

32,

84,

172

D12,

K4,

P10

H3,

L8,

A10

22,

59,

119

Ground: 0 V reference for internal logic.

VSSA

Analog ground: 0 V power supply and reference for the ADC

and DAC. This should be the same voltage as VSS, but should

be isolated to minimize noise and error.

XTAL1

[14]

[16]

Input to the oscillator circuit and internal clock generator circuits.

XTAL2

[14]

[16]

Output from the oscillator amplifier.

Table 3.

Pin description …continued

Not all functions are available on all parts. See Table 2 (Ethernet, USB, LCD, QEI, SD/MMC, DAC pins) and Table 7 (EMC

pins).

Symbol

Description

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