User manual

LPCXpresso Experiment Kit - User’s Guide

Page 133

7.21 Differences between LPCXpresso LPC111x and LPC1114 in DIL28

The experiments are based on the LPCXpresso LPC111x boards that can be based on the LPC1114

or the LPC1115. For all practical purposes, these two chips are interchangeable. The LPC1115 has

the double amount of FLASH (64kByte instead of 32kByte for the LPC1114). At the time of writing the

LPCXpresso LPC1114 board has been discontinued in favor for the LPC1115 version, so the majority

of users will likely work with the LPCXpresso LPC1115 board.

One of the included components is the LPC1114FN28/102 chip, which comes in a DIP28 package.

That is a package that can easily be used on a breadboard. Figure 74 below (from the LPC111x User’s

manual) lists the differences.

Figure 74 – LPC111x Variant Comparison

There are some differences when working with the LPC1114FN28/102 chip. Memory-wise, the

difference is small. The chip has half the amount of SRAM (4kByte) when compared to the

LPC1115/1114 on an LPCXpresso board. The big difference is less available pins. When working on

the breadboard the solution is simply to switch which pins to use (since all are not used simultaneous),

so no problem there. When having soldered all components to the PCB, the setup is more fixed. Most

of the pins that are lacking on the DIP28 package have been routed to U7 (PCA9532), the I2C-GPIO

expander. That way it is possible to access these signals (pins) via I2C instead. The experiments

affected with pcb mounted components are the following:

 8 LEDs, signals GPIO_9-LED-SSEL, GPIO_21-LED, GPIO_22-LED and GPIO_23-LED are

not connected to the LPC1114FN28. GPIO_9-LED-SSEL is however connected to U7

(PCA9532).