LPC2377 datasheet(14/55 Pages) NXP

14 / 55 page

LPC2377_78_4

Product data sheet

Rev. 04 — 19 November 2008

14 of 55

NXP Semiconductors

LPC2377/78

Single-chip 16-bit/32-bit microcontroller

[1]

5 V tolerant pad providing digital I/O functions with TTL levels and hysteresis.

[2]

5 V tolerant pad providing digital I/O functions (with TTL levels and hysteresis) and analog input. When conﬁgured as a DAC input,

digital section of the pad is disabled.

[3]

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.

[4]

Open-drain, 5 V tolerant digital I/O pad compatible with I2C-bus 400 kHz speciﬁcation. It requires an external pull-up to provide output

functionality. When power is switched off, this pin connected to the I2C-bus is ﬂoating and does not disturb the I2C lines. Open-drain

conﬁguration applies to all functions on this pin.

[5]

Pad provides digital I/O and USB functions (LPC2378 only). It is designed in accordance with the

USB speciﬁcation, revision 2.0

(Full-speed and Low-speed mode only).

[6]

5 V tolerant pad with 5 ns glitch ﬁlter providing digital I/O functions with TTL levels and hysteresis.

[7]

5 V tolerant pad with 20 ns glitch ﬁlter providing digital I/O function with TTL levels and hysteresis.

[8]

Pad provides special analog functionality.

[9]

Pad provides special analog functionality.

RTCK

143[1]

I/O

RTCK — JTAG interface control signal.

Note: LOW on this pin while RESET is LOW enables ETM pins (P2[9:0]) to operate

as Trace port after reset.

RSTOUT

RSTOUT — This is a 3.3 V pin. LOW on this pin indicates LPC2377/78 being in

Reset state.

RESET

24[7]

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

31[8]

Input to the oscillator circuit and internal clock generator circuits.

XTAL2

33[8]

Output from the oscillator ampliﬁer.

RTCX1

23[8]

Input to the RTC oscillator circuit.

RTCX2

25[8]

Output from the RTC oscillator circuit.

VSS

22, 44,

59, 65,

79, 103,

117,119,

139[9]

ground: 0 V reference.

VSSA

15[10]

analog ground: 0 V reference. This should nominally be the same voltage as VSS,

but should be isolated to minimize noise and error.

VDD(3V3)

41, 62,

77, 102,

114,

138[11]

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

n.c.

21, 81,

98[12]

Leave these pins unconnected.

VDD(DCDC)(3V3)

18, 60,

121[13]

3.3 V DC-to-DC converter supply voltage: This is the power supply for the on-chip

DC-to-DC converter only.

VDDA

14[14]

analog 3.3 V pad supply voltage: This should be nominally the same voltage as

VDD(3V3) but should be isolated to minimize noise and error. This voltage is used to

power the ADC and DAC.

VREF

17[14]

ADC reference: This should be nominally the same voltage as VDD(3V3) but should

be isolated to minimize noise and error. The level on this pin is used as a reference

for ADC and DAC.

VBAT

27[14]

RTC pin power supply: 3.3 V on this pin supplies the power to the RTC peripheral.

Table 3.

Pin description …continued

Symbol

Type

Description

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