LPC1850 datasheet(99/142 Pages) NXP

99 / 142 page

LPC1850_30_20_10

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Preliminary data sheet

Rev. 2.2 — 9 September 2011

99 of 142

NXP Semiconductors

LPC1850/30/20/10

32-bit ARM Cortex-M3 microcontroller

11.2 IRC and RTC oscillators

[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.

11.3 I2C-bus

Table 11.

Dynamic characteristic: IRC and RTC oscillators

Tamb = 40 C to +85 C; <tbd>  VDD(IO)  <tbd>.[1]

Symbol

Parameter

Conditions

Min

Typ[2]

Max

Unit

fosc(RC)

internal RC oscillator

frequency

<tbd>

12.00

<tbd>

MHz

fi(RTC)

RTC input frequency

32.768

kHz

Conditions: Frequency values are typical values. 12 MHz

 1 % accuracy is guaranteed for

2.7 V

 V

DD(IO)  3.6 V and Tamb = 40 Cto +85 C. Variations between parts may cause the IRC

to fall outside the 12 MHz

 1 % accuracy specification for voltages below 2.7 V.

Fig 29. Internal RC oscillator frequency versus temperature

<tbd>

X (X)

001aab173

(X)

Table 12.

Dynamic characteristic: I2C-bus pins

Tamb = 40 C to +85 C.[1]

Symbol

Parameter

Conditions

Min

Max

Unit

fSCL

SCL clock frequency

Standard-mode

100

kHz

Fast-mode

400

kHz

Fast-mode Plus

MHz

fall time

[3][4][5][6]

of both SDA and

SCL signals

Standard-mode

300

Fast-mode

20 + 0.1

 C

300

Fast-mode Plus

120

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