LPC2468FET208,551 NXP Semiconductors, LPC2468FET208,551 Datasheet - Page 43

• Manufacturer Part Number: LPC2468FET208,551
• Description: IC ARM7 MCU FLASH 512K 208TFBGA
• Manufacturer: NXP Semiconductors
• Series: LPC2400r

Specifications of LPC2468FET208,551

• Program Memory Type: FLASH
• Program Memory Size: 512KB (512K x 8)
• Package / Case: 208-TFBGA
• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 72MHz
• Connectivity: CAN, EBI/EMI, Ethernet, I²C, Microwire, MMC, SPI, SSI, SSP, UART/USART, USB OTG
• Peripherals: Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
• Number Of I /o: 160
• Ram Size: 98K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: LPC24
• Core: ARM7TDMI-S
• Data Bus Width: 16 bit, 32 bit
• Data Ram Size: 98 KB
• Interface Type: CAN/I2S/ISP/SSP/UART/USB
• Maximum Clock Frequency: 72 MHz
• Number Of Programmable I/os: 160
• Number Of Timers: 6
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2, IRD-LPC2468-DEV, SAB-TFBGA208, KSK-LPC2468-PL
• Development Tools By Supplier: OM10100
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8-ch x 10-bit
• On-chip Dac: 1-ch x 10-bit
• Package: 208TFBGA
• Device Core: ARM7TDMI-S
• Family Name: LPC2000
• Maximum Speed: 72 MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 622-1025 - KIT DEV IND REF DESIGN LPC2468622-1024 - BOARD SCKT ADAPTER FOR TFBGA208568-4358 - DISPLAY QVGA TFT FOR OM10100568-4309 - BOARD EXTENSION LPCSTICK568-4308 - EVAL LPC-STICK WITH LPC2468MCB2400U - BOARD EVAL MCB2400 + ULINK2MCB2400 - BOARD EVAL FOR NXP LPC246X SER622-1005 - USB IN-CIRCUIT PROG ARM7 LPC2K
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 568-4262; 935283234551; LPC2468FET208-S

NXP Semiconductors
2. Oscillators
UM10237_4
User manual
2.1 Internal RC oscillator
2.2 Main oscillator
The LPC2400 includes three independent oscillators. These are the Main Oscillator, the
Internal RC Oscillator, and the RTC oscillator. Each oscillator can be used for more than
one purpose as required in a particular application.
Following Reset, the LPC2400 will operate from the Internal RC Oscillator until switched
by software. This allows systems to operate without any external crystal, and allows the
Boot Loader code to operate at a known frequency. When Boot Block will branch to a user
program, there could be an option to activate the main oscillator prior to entering user
code.
The Internal RC Oscillator (IRC) may be used as the clock source for the watchdog timer,
and/or as the clock that drives the PLL and subsequently the CPU. The precision of the
IRC does not allow for use of the USB interface, which requires a much more precise time
base. Also, do not use the IRC for the CAN1/2 block if the CAN baud rate is higher than
100 kbit/s.The nominal IRC frequency is 4 MHz.
Upon power up or any chip reset, the LPC2400 uses the IRC as the clock source.
Software may later switch to one of the other available clock sources.
The main oscillator can be used as the clock source for the CPU, with or without using the
PLL. The main oscillator operates at frequencies of 1 MHz to 24 MHz. This frequency can
be boosted to a higher frequency, up to the maximum CPU operating frequency, by the
PLL. The oscillator output is called oscclk. The clock selected as the PLL input is pllclkin
and the ARM processor clock frequency is referred to as cclk for purposes of rate
equations, etc. elsewhere in this document. The frequencies of pllclkin and cclk are the
same value unless the PLL is active and connected. Refer to the PLL description in this
chapter for details.
The onboard oscillator in the LPC24xx can operate in one of two modes: slave mode and
oscillation mode.
In slave mode the input clock signal should be coupled by means of a capacitor of 100 pF
(C
in this configuration can be left not connected.
External components and models used in oscillation mode are shown in
drawings b and c, and in
integrated on chip, only a crystal and the capacitances C
externally in case of fundamental mode oscillation (the fundamental frequency is
represented by L, C
parallel package capacitance and should not be larger than 7 pF. Parameters F
and C
i
in
Figure
P
are supplied by the crystal manufacturer.
4–13, drawing a), with an amplitude of at least 200 mV(RMS). The XTAL2 pin
L
and R
Rev. 04 — 26 August 2009
Table 4–39
S
). Capacitance C
and
Chapter 4: LPC24XX Clocking and power control
Table
P
in
4–40. Since the feedback resistance is
Figure
X1
4–13, drawing c, represents the
and C
X2
need to be connected
UM10237
© NXP B.V. 2009. All rights reserved.
Figure
C
4–13,
, C
43 of 792
L
, R
S