LPC2387 datasheet(13/66 Pages) NXP

13 / 66 page

LPC2387

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Product data sheet

Rev. 5.1 — 16 October 2013

13 of 66

NXP Semiconductors

LPC2387

Single-chip 16-bit/32-bit MCU

[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. This pad 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. 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 10 ns glitch filter providing digital I/O functions with TTL levels and hysteresis.

[7]

This pin has no built-in pull-up and no built-in pull-down resistor.

[8]

This pin has a built-in pull-up resistor.

[9]

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

[10] Pad provides special analog functionality.

[11] When the main oscillator is not used, connect XTAL1 and XTAL2 as follows: XTAL1 can be left floating or can be grounded (grounding

is preferred to reduce susceptibility to noise). XTAL2 should be left floating.

[12] If the RTC is not used, these pins can be left floating.

[13] Pad provides special analog functionality.

[14] Pad provides special analog functionality.

[15] Pad provides special analog functionality.

[16] Pad provides special analog functionality.

[17] Pad provides special analog functionality.

VSS

15, 31,

41, 55,

72, 97,

83[13]

ground: 0 V reference.

VSSA

11[14]

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)

28, 54,

71, 96[15]

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

VDD(DCDC)(3V3)

13, 42,

84[16]

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

on-chip DC-to-DC converter only.

VDDA

10[17]

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

12[17]

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

should be isolated to minimize noise and error. Level on this pin is used as a

reference for ADC and DAC.

VBAT

19[17]

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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