LPC2142 datasheet(12/45 Pages) NXP

12 / 45 page

LPC2141_42_44_46_48

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Product data sheet

Rev. 5 — 12 August 2011

12 of 45

NXP Semiconductors

LPC2141/42/44/46/48

Single-chip 16-bit/32-bit microcontrollers

[1]

5 V tolerant pad (no built-in pull-up resistor) providing digital I/O functions with TTL levels and hysteresis and 10 ns slew rate control.

[2]

5 V tolerant pad (no built-in pull-up resistor) providing digital I/O functions with TTL levels and hysteresis and 10 ns slew rate control. If

configured for an input function, this pad utilizes built-in glitch filter that blocks pulses shorter than 3 ns.

[3]

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

functionality.

[4]

5 V tolerant pad (no built-in pull-up resistor) providing digital I/O (with TTL levels and hysteresis and 10 ns slew rate control) and analog

input function. If configured for an input function, this pad utilizes built-in glitch filter that blocks pulses shorter than 3 ns. When

configured as an ADC input, digital section of the pad is disabled.

[5]

5 V tolerant pad (no built-in pull-up resistor) providing digital I/O (with TTL levels and hysteresis and 10 ns slew rate control) and analog

output function. When configured as the DAC output, digital section of the pad is disabled.

[6]

5 V tolerant pad with built-in pull-up resistor providing digital I/O functions with TTL levels and hysteresis and 10 ns slew rate control.

The pull-up resistor’s value typically ranges from 60 k

 to 300 k.

[7]

Pad is designed in accordance with the Universal Serial Bus (USB) specification, revision 2.0 (Full-speed and Low-speed mode only).

[8]

5 V tolerant pad providing digital input (with TTL levels and hysteresis) function only.

[9]

Pad provides special analog functionality.

[10] When unused, the RTCX1 pin can be grounded or left floating. For lowest power leave it floating.

The other RTC pin, RTCX2, should be left floating.

VDDA

Analog 3.3 V power supply: This should be nominally the same

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

This voltage is only used to power the on-chip ADC(s) and DAC.

VREF

ADC reference voltage: This should be nominally less than or equal

to the VDD voltage but should be isolated to minimize noise and error.

Level on this pin is used as a reference for ADC(s) and DAC.

VBAT

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

the RTC.

Table 3.

Pin description …continued

Symbol

Type

Description

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