LPC2378FBD144,551 NXP Semiconductors, LPC2378FBD144,551 Datasheet - Page 59

• Manufacturer Part Number: LPC2378FBD144,551
• Description: IC ARM7 MCU FLASH 512K 144LQFP
• Manufacturer: NXP Semiconductors
• Series: LPC2300r

Specifications of LPC2378FBD144,551

• Program Memory Type: FLASH
• Program Memory Size: 512KB (512K x 8)
• Package / Case: 144-LQFP
• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 72MHz
• Connectivity: CAN, EBI/EMI, Ethernet, I²C, Microwire, MMC, SPI, SSI, SSP, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
• Number Of I /o: 104
• Ram Size: 58K 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: LPC23
• Core: ARM7TDMI-S
• Data Bus Width: 16 bit, 32 bit
• Data Ram Size: 58 KB
• Interface Type: CAN/I2S/ISP/UART/USB
• Maximum Clock Frequency: 72 MHz
• Number Of Programmable I/os: 104
• Number Of Timers: 4
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2, KSDKLPC2378-02, MCB2370, MCB2370U, MCB2370UME
• Development Tools By Supplier: OM10094
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8-ch x 10-bit
• On-chip Dac: 1-ch x 10-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 568-4310 - EVAL BOARD LPC2158 W/LCDMCB2370UME - BOARD EVAL MCB2370 + ULINK-MEMCB2370U - BOARD EVAL MCB2370 + ULINK2MCB2370 - BOARD EVAL NXP LPC2368/2378568-3999 - BOARD EVAL FOR LPC23 ARM MCU622-1005 - USB IN-CIRCUIT PROG ARM7 LPC2K
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 568-3998; 935282458551; LPC2378FBD144-S

NXP Semiconductors
LPC2377_78
Product data sheet
14.3 RTC 32 kHz oscillator component selection
14.4 XTAL and RTCX Printed Circuit Board (PCB) layout guidelines
The RTC external oscillator circuit is shown in
integrated on chip, only a crystal, the capacitances C
externally to the microcontroller.
Table 17
capacitance of the crystal and is usually specified by the crystal manufacturer. The actual
C
different load capacitance, the circuit will oscillate at a slightly different frequency
(depending on the quality of the crystal) compared to the specified one. Therefore for an
accurate time reference it is advised to use the load capacitors as specified in Table
Table 17
specified in this table are calculated from the internal parasitic capacitances and the C
Parasitics from PCB and package are not taken into account.
Table 17.
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
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
accordingly to the increase in parasitics of the PCB layout.
Crystal load capacitance
C
11 pF
13 pF
15 pF
Fig 23. RTC oscillator modes and models: oscillation mode of operation and external
L
L
influences oscillation frequency. When using a crystal that is manufactured for a
gives the crystal parameters that should be used. C
that belong to a specific C
crystal model used for C
Recommended values for the RTC external 32 kHz oscillator C
All information provided in this document is subject to legal disclaimers.
RTCX1
C X1
LPC2xxx
32 kHz XTAL
Rev. 5 — 17 June 2010
Maximum crystal series
resistance R
< 100 kΩ
< 100 kΩ
< 100 kΩ
RTCX2
C X2
X1
/C
L
. The value of external capacitances C
X2
S
evaluation
x1
Single-chip 16-bit/32-bit microcontrollers
Figure
and C
X1
=
23. Since the feedback resistance is
x2
External load capacitors C
18 pF, 18 pF
22 pF, 22 pF
27 pF, 27 pF
and C
should be chosen smaller
L
X2
is the typical load
x1
LPC2377/78
need to be connected
, C
L
C L
R S
x2
002aaf495
, and C
© NXP B.V. 2010. All rights reserved.
X1
C P
/C
X1
X2
x3
and C
components
in case of
X1
/C
59 of 68
X2
X2
L
.