Datasheet
LPC178X_7X All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 5 — 9 September 2014 34 of 122
NXP Semiconductors
LPC178x/7x
32-bit ARM Cortex-M3 microcontroller
VBAT 38 M3 K1 27 - I RTC power supply: 3.0 V on this pin supplies power to the RTC.
V
DD(REG)(3V3)
26,
86,
174
H4,
P11,
D11
G1,
N9,
E9
18,
60,
121
- S 3.3 V regulator supply voltage: This is the power supply for the
on-chip voltage regulator that supplies internal logic.
V
DDA
20 G4 F2 14 - S Analog 3.3 V pad supply voltage: This can be connected to the
same supply as V
DD(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 3.3 V if the ADC and
DAC are not used.
V
DD(3V3)
15,
60,
71,
89,
112,
125,
146,
165,
181,
198
G3,
P6,
P8,
U13,
P17,
K16,
C17,
B13,
C9,
D7
E2,
L4,
K8,
L11,
J14,
E12,
E10,
C5
41,
62,
77,
102,
114,
138
- S 3.3 V supply voltage: This is the power supply voltage for I/O
other than pins in the VBAT domain.
VREFP 24 K1 G2 17 - S ADC positive reference voltage: This should be the same
voltage as V
DDA
, 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 3.3 V if the
ADC and DAC are not used.
V
SS
33,
63,
77,
93,
114,
133,
148,
169,
189,
200
L3,
T5,
R9,
P12,
N16,
H14,
E15,
A12,
B6,
A2
H4,
P4,
L9,
L13,
G13,
D13,
C11,
B4
44,
65,
79,
103,
117,
139
- G Ground: 0 V reference for digital IO pins.
V
SSREG
32,
84,
172
D12,
K4,
P10
H3,
L8,
A10
22,
59,
119
- G Ground: 0 V reference for internal logic.
V
SSA
22 J2 F3 15 - G Analog ground: 0 V power supply and reference for the ADC
and DAC. This should be the same voltage as V
SS
, but should
be isolated to minimize noise and error.
XTAL1 44 M4 L2 31
[14]
[16]
- I Input to the oscillator circuit and internal clock generator circuits.
XTAL2 46 N4 K4 33
[14]
[16]
- O 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
Pin LQFP208
Ball TFBGA208
Ball TFBGA180
Pin LQFP144
Reset state
[1]
Type
[2]
Description