Nuts & Volts
Nuts & Volts
Nuts & Volts
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
power input pin for the LPC2136, but<br />
there is an analog-to-digital converter<br />
voltage reference pin (V ref ), which is<br />
filtered with C5, a 10 μF tantalum<br />
capacitor. A single ground and one<br />
power line feed all of the LPC2136<br />
power points. A separate power<br />
source must be provided if you don’t<br />
want to place the voltage reference<br />
pin (V ref ) at the +3.3 VDC level.<br />
It would be redundant to build<br />
up both an LPC2106 and an LPC2136<br />
system, as many of the base features<br />
of the devices overlap. So, rather than<br />
build up a LPC2106 system, I decided<br />
that it would be better to build up<br />
an LPC2136 system, as all of the<br />
■ SCHEMATIC 2. The RS-232 serial port<br />
circuitry and the LPC2000 Flash Utility<br />
interface circuitry shown here can be<br />
added as-is to the LPC2106 schematic to<br />
represent a minimal LPC2106 system.<br />
As powerful as the LPC2136 is, this is all<br />
you need to get it up and running.<br />
■ PHOTO 3. Only<br />
eight external<br />
connections had to<br />
be made to bring<br />
the LPC2136 to life.<br />
The LPC2000 Flash<br />
Utility circuitry is at<br />
the bottom left of<br />
this shot. The extra<br />
crystal and the<br />
LM1117MP-1.8 for<br />
an LPC2106 are<br />
on the prototype<br />
board, as well.<br />
basic ARM7 stuff<br />
found within the<br />
LPC2106 will still<br />
be covered, plus I get to talk about<br />
and show you things that have to do<br />
with the LPC2136 peripheral set. With<br />
that, my LPC2136 test bed is shown<br />
in Photo 3. Let’s take a look at<br />
the hardware you see in Photo 3<br />
subsystem by subsystem, beginning<br />
THE DESIGN CYCLE<br />
with the power supply.<br />
LPC2136 HARDWARE<br />
You can use your favorite brand<br />
or type of voltage regulator. All that<br />
matters is that you end up with clean,<br />
+3.3VDC<br />
U2<br />
P1<br />
1<br />
6<br />
2<br />
7<br />
3<br />
8<br />
4<br />
9<br />
5<br />
DB9 FEMALE<br />
DTR<br />
TXD0<br />
C7<br />
.1uF<br />
C8<br />
.1uF<br />
SW2<br />
RESET<br />
TX0OUT<br />
RX0IN<br />
R1<br />
10K<br />
13<br />
8<br />
11<br />
10<br />
1<br />
D2<br />
LL4148<br />
U1<br />
R1IN<br />
R2IN<br />
T1IN<br />
T2IN<br />
C1+<br />
SP3232 PIN 16 = +3.3VDC<br />
SP3232 PIN 15 = GND<br />
D3<br />
LL4148<br />
SP3232<br />
R2<br />
22K<br />
BC846<br />
R1OUT<br />
R2OUT<br />
T1OUT<br />
T2OUT<br />
C2-<br />
R3<br />
10K<br />
SW1<br />
Q1<br />
12<br />
9<br />
14<br />
7<br />
3 4<br />
C1- C2+<br />
2 6<br />
V+ V-<br />
5<br />
R4<br />
22K<br />
R5<br />
1K<br />
RXD0<br />
C9<br />
.1uF<br />
C10<br />
.1uF<br />
ISPSEL<br />
TXD0<br />
RXD0<br />
RESET<br />
C5<br />
LPC2136 SYSTEM SCHEMATIC<br />
19<br />
21<br />
P0.0/TXD0/PWM1<br />
P1.16/TRACEPKT0<br />
22<br />
P0.1/RXD0/PWM3/EINT0 P1.17/TRACEPKT1<br />
26<br />
P0.2/SCL0/CAP0.0<br />
P1.18/TRACEPKT2<br />
27<br />
P0.3/SDA0/MAT0.0/EINT1 P1.19/TRACEPKT3<br />
29<br />
P0.4/SCK0/CAP0.1/AD0.6 P1.20/TRACESYNC<br />
30<br />
P0.5/MISO0/MAT0.1/AD0.7 P1.21/PIPESTAT0<br />
31<br />
P0.6/MOSI0/CAP0.2/AD1.0 P1.22/PIPESTAT1<br />
P0.7/SSEL0/PWM2/EINT2 P1.23/PIPESTAT2<br />
33<br />
34<br />
P0.8/TXD1/PWM4/AD1.1 P1.24/TRACECLK<br />
35<br />
P0.9/RXD1/PWM6/EINT3<br />
P1.25/EXTIN0<br />
37<br />
P0.10/RTS1/CAP1.0/AD1.2 P1.26/RTCK<br />
38<br />
P0.11/CTS1/CAP1.1/SCL1<br />
P1.27/TDO<br />
39<br />
P0.12/DSR1/MAT1.0/AD1.3<br />
P1.28/TDI<br />
41<br />
P0.13/DTR1/MAT1.1/AD1.4<br />
P1.29/TCK<br />
45<br />
P0.14/DCD1/EINT1/SDA1<br />
P1.30/TMS<br />
P0.15/RI1/EINT2/AD1.5<br />
P1.31/TRST<br />
46<br />
47<br />
P0.16/EINT0/MAT0.2/CAP0.2<br />
53<br />
P0.17/CAP1.2/SCK1/MAT1.2<br />
XTAL1<br />
54<br />
P0.18/CAP1.3/MISO1/MAT1.3<br />
55<br />
P0.19/MAT1.2/MOSI1/CAP1.2<br />
1<br />
P0.20/MAT1.3/SSEL1/EINT3<br />
2<br />
P0.21/PWM5/AD1.6/CAP1.3<br />
XTAL2<br />
58<br />
P0.22/AD1.7/CAP0.0/MAT0.0<br />
P0.23<br />
9<br />
10<br />
P0.25/AD0.4/AOUT<br />
11<br />
P0.26/AD0.5<br />
13<br />
P0.27/AD0.0/CAP0.1/MAT0.1<br />
14<br />
P0.28/AD0.1/CAP0.2/MAT0.2<br />
15<br />
P0.29/AD0.2/CAP0.3/MAT0.3<br />
17<br />
P0.30/AD0.3/EINT3/CAP0.0<br />
P0.31<br />
+<br />
57<br />
3<br />
5<br />
63<br />
10uF<br />
RESET<br />
RTXC1<br />
RTXC2<br />
Vref<br />
J1<br />
+6-9VDC<br />
D1<br />
1<br />
1N5819<br />
C5 +<br />
10uF<br />
2<br />
LPC2136<br />
Vbat<br />
Vdd1<br />
Vdd2<br />
Vdd3<br />
VddA<br />
Vss1<br />
Vss2<br />
Vss3<br />
Vss4<br />
Vss5<br />
VssA<br />
16<br />
12<br />
8<br />
4<br />
48<br />
44<br />
40<br />
36<br />
32<br />
28<br />
24<br />
64<br />
60<br />
56<br />
52<br />
20<br />
62<br />
61<br />
49<br />
23<br />
43<br />
51<br />
7<br />
6<br />
18<br />
25<br />
42<br />
50<br />
59<br />
VR1<br />
LM1086CS-3.3<br />
1 3<br />
IN<br />
OUT<br />
GND<br />
2<br />
C1<br />
.1uF<br />
12MHz<br />
Y1 39pF<br />
C12<br />
+3.3VDC<br />
C6<br />
C2<br />
.1uF<br />
+3.3VDC<br />
+<br />
39pF<br />
10uF<br />
C11<br />
C3<br />
.1uF<br />
C4<br />
.1uF<br />
April 2006 91
Change language