Datasheet

LPC2194 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 6 — 14 June 2011 8 of 41
NXP Semiconductors
LPC2194
Single-chip 16/32-bit microcontroller
[1] SSP interface available on LPC2194/01 only.
V
SSA
59 I analog ground; 0 V reference. This should nominally be the same voltage as V
SS
,
but should be isolated to minimize noise and error.
V
SSA(PLL)
58 I PLL analog ground; 0 V reference. This should nominally be the same voltage as
V
SS
, but should be isolated to minimize noise and error.
V
DD(1V8)
17, 49 I 1.8 V core power supply; this is the power supply voltage for internal circuitry.
V
DDA(1V8)
63 I analog 1.8 V core power supply; this is the power supply voltage for internal
circuitry. This should be nominally the same voltage as V
DD(1V8)
but should be
isolated to minimize noise and error.
V
DD(3V3)
23, 43, 51 I 3.3 V pad power supply; this is the power supply voltage for the I/O ports.
V
DDA(3V3)
7 I analog 3.3 V pad power supply; this should be nominally the same voltage as
V
DD(3V3)
but should be isolated to minimize noise and error.
Table 2. Pin description …continued
Symbol Pin Type Description