LPC2131 datasheet(31/39 Pages) NXP

31 / 39 page

LPC2131_32_34_36_38_4

Product data sheet

Rev. 04 — 16 October 2007

31 of 39

NXP Semiconductors

LPC2131/32/34/36/38

Single-chip 16/32-bit microcontrollers

Dynamic characteristics

[1]

Parameters are valid over operating temperature range unless otherwise speciﬁed.

[2]

Typical ratings are not guaranteed. The values listed are at room temperature (25

°C), nominal supply voltages.

[3]

Bus capacitance Cb in pF, from 10 pF to 400 pF.

Fig 8.

Suggested ADC interface - LPC2131/32/34/36/38 ADx.y pin

LPC2131/32/34/36/38

ADx.ySAMPLE

ADx.y

20 k

Ω

3 pF

5 pF

Rvsi

VSS

VEXT

002aad452

Table 8.

Dynamic characteristics

Tamb = −40 °C to +85 °C for commercial applications, VDD over speciﬁed ranges.[1]

Symbol

Parameter

Conditions

Min

Typ[2]

Max

Unit

External clock

fosc

oscillator frequency

MHz

Tcy(clk)

clock cycle time

100

tCHCX

clock HIGH time

Tcy(clk) × 0.4

tCLCX

clock LOW time

Tcy(clk) × 0.4

tCLCH

clock rise time

tCHCL

clock fall time

Port pins (except P0.2 and P0.3)

tr(o)

output rise time

tf(o)

output fall time

I2C-bus pins (P0.2 and P0.3)

tf(o)

output fall time

VIH to VIL

20 + 0.1

× Cb[3]

--ns

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