LPC2194 datasheet(8/33 Pages) PHILIPS

8 / 33 page

Philips Semiconductors

LPC2194

Single-chip 16/32-bit microcontrollers

Preliminary data

Rev. 01 — 06 February 2004

8 of 33

9397 750 12757

TD1

TD1 — CAN1 transmitter output.

RESET

External Reset input: A LOW on this pin resets the device, causing I/O ports

and peripherals to take on their default states, and processor execution to

begin at address 0. TTL with hysteresis, 5 V tolerant.

XTAL1

Input to the oscillator circuit and internal clock generator circuits.

XTAL2

Output from the oscillator ampliﬁer.

VSS

6, 18, 25, 42,

Ground: 0 V reference.

VSSA

Analog Ground: 0 V reference. This should nominally be the same voltage

as VSS, but should be isolated to minimize noise and error.

VSSA_PLL

PLL Analog Ground: 0 V reference. This should nominally be the same

voltage as VSS, but should be isolated to minimize noise and error.

V18

17, 49

1.8 V Core Power Supply: This is the power supply voltage for internal

circuitry.

V18A

Analog 1.8 V Core Power Supply: This is the power supply voltage for

internal circuitry. This should be nominally the same voltage as V18 but should

be isolated to minimize noise and error.

23, 43, 51

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

V3A

Analog 3.3 V Pad Power Supply: This should be nominally the same voltage

as V3 but should be isolated to minimize noise and error.

Table 3:

Pin description…continued

Symbol

Type

Description

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