DK-35TS-LPC2478 Future Designs Inc, DK-35TS-LPC2478 Datasheet - Page 7

• Manufacturer Part Number: DK-35TS-LPC2478
• Description: PROGRAMMERS, DEVELOPMENT SYSTEMS
• Manufacturer: Future Designs Inc

Specifications of DK-35TS-LPC2478

• Sensor Type: Touch Screen
• Interface: I²C
• Voltage - Supply: 5V
• Embedded: Yes, MCU, 16/32-Bit
• Utilized Ic / Part: LPC2478 ARM7
• For Use With: 568-4742 - MODULE DIMM LPC2478 ARM7
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sensitivity: -
• Sensing Range: -
• Other names: 622-1034; ARM-35TS-LPC2478

NXP Semiconductors
4. AC/DC deviations detail
ES_LPC2478
Errata sheet
4.1 IRC.1: Accuracy of the Internal RC oscillator (IRC) frequency may be
outside of the 4 MHz +/ 1 % specification only at extreme
temperatures
Introduction:
The device has a 4 MHz internal RC oscillator (IRC) which can be optionally used as the
clock source for the Watch Dog Timer (WDT), and/or as the clock that drives the PLL and
subsequently the CPU. The IRC frequency spec is 4 MHz +/ 1 % accuracy over the
entire voltage and temperature range. During In-System Programming (ISP), the
auto-baud routine is expecting the IRC frequency to be 4 MHz +/ 1 % and is used to
synchronize with the host via serial port 0.
Problem:
On the LPC2478 Rev C device only, the accuracy of internal RC oscillator (IRC)
frequency meets 4 MHz +/ 1 % specification only at room temperature however, at
extreme temperatures, the accuracy of internal RC oscillator (IRC) frequency may be
4 MHz +/ 10 %. As a result, at extreme temperatures, this may affect the auto-baud
routine's ability to synchronize with the host via serial port 0 during In-System
Programming (ISP) at higher baud rates.
Work-around:
None.
All information provided in this document is subject to legal disclaimers.
Rev. 6 — 1 March 2011
ES_LPC2478
Errata sheet LPC2478
© NXP B.V. 2011. All rights reserved.
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