LPC2925FBD100,551 NXP Semiconductors, LPC2925FBD100,551 Datasheet - Page 74

• Manufacturer Part Number: LPC2925FBD100,551
• Description: IC ARM9 MCU FLASH 512KB 100-LQFP
• Manufacturer: NXP Semiconductors
• Series: LPC2900r

Specifications of LPC2925FBD100,551

• Core Processor: ARM9
• Core Size: 32-Bit
• Speed: 125MHz
• Connectivity: CAN, I²C, LIN, SPI, UART/USART, USB
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 60
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 16K x 8
• Ram Size: 40K x 8
• Voltage - Supply (vcc/vdd): 1.71 V ~ 3.6 V
• Data Converters: A/D 16x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-LQFP
• Processor Series: LPC29
• Core: ARM968E-S
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935287116551

NXP Semiconductors
LPC2921_23_25_3
Product data sheet
10.4 XIN_OSC input
10.5 XIN_OSC Printed Circuit Board (PCB) layout guidelines
The input voltage to the on-chip oscillators is limited to 1.8 V. If the oscillator is driven by a
clock in slave mode, it is recommended that the input be coupled through a capacitor with
C
capacitor to ground C
mode, a minimum of 200 mV (RMS) is needed. For more details see the LPC29xx User
manual UM10316.
The crystal should be connected on the PCB as close as possible to the oscillator input
and output pins of the chip. Take care that the load capacitors C
case of third overtone crystal usage, have a common ground plane. The external
components must also be connected to the ground plain. Loops must be made as small
as possible, in order to keep the noise coupled in via the PCB as small as possible. Also
parasitics should stay as small as possible. Values of C
smaller accordingly to the increase in parasitics of the PCB layout.
Fig 31. Slave mode operation of the on-chip oscillator
i
= 100 pF. To limit the input voltage to the specified range, choose an additional
All information provided in this document is subject to legal disclaimers.
g
which attenuates the input voltage by a factor C
Rev. 03 — 14 April 2010
XIN_OSC
ARM9 microcontroller with CAN, LIN, and USB
LPC29xx
C i
100 pF
LPC2921/2923/2925
002aae730
C g
x1
and C
x2
x1
should be chosen
and C
i
/(C
© NXP B.V. 2010. All rights reserved.
x2
i
, and C
+ C
g
). In slave
x3
74 of 84
in