Appendix A Schematic And Layout; Ads1232Ref Bill Of Materials - Texas Instruments ADS1232REF User Manual

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To allow firmware to be downloaded through USB, U4 is connected to the microcontroller bootstrap loader
pins. The DTR and RTS pins are connected to the RST and TCK inputs on the microcontroller to allow the
serial bootstrap loader to operate. These lines are not isolated; instead, they are switched through SW9,
which also connects USB ground and power to the microcontroller ground and power. Normally this switch
is open; it is only switched on when firmware is to be downloaded through USB. This feature also protects
the microcontroller from unknown states on these pins at power-up.

Appendix A Schematic and Layout

The printed circuit board (PCB) layouts for the top and bottom sides of the ADS1232REF are shown in
Figure 9 and Figure
bill of materials is provided in
A.1 Bill of Materials
REFERENCE DESIGNATOR
R23, R24
R17
R2, R3
R12–R15
R11
R1
R4–R10, R16
R25, R26
R18, R27
R22
R19-R21
C1, C2, C16, C17
C29, C30, C31, C32
C38–C43, C48, C49
C5, C11, C13–C15
C12, C21, C33–C36
C6, C7
C9, C10, C22
C37, C44–C47
C23–C28
C3
C8, C18–C20
C4
U6
U5
U2, U3
SBAU120B – November 2005 – Revised July 2011
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10, respectively. The schematic for the ADS1232REF is shown in
Table 9.
Table 9. ADS1232REF Bill of Materials
DESCRIPTION
0 1/16W 1% Chip Resistor
20 1/4W 5% Chip Resistor
33 1/10W 5% Chip Resistor
100 1/10W 5% Chip Resistor
220 1/10W 5% Chip Resistor
1.5K 1/10W 5% Chip Resistor
10K 1/10W 5% Chip Resistor
20K 1/16W 1% Chip Resistor
47K 1/10W 5% Chip Resistor
200k Potentiometer 200kΩ, 1/4in
SQ
221k 1/16W 1% Chip Resistor
22pF 50V Ceramic Chip
Capacitor, ±0.5pF, NPO
100pF 16V PPS Film Chip
Capacitor, 2%
100pF Filter High Frequency,
100pF
0.01μF 50V Ceramic Chip
Capacitor, ±10%, X7R
0.1μF 50V Ceramic Chip
Capacitor, ±10%, X7R
0.1μF 16V PPS Film Chip
Capacitor, 2%
1μF 16V Ceramic Chip
Capacitor, ±10%, X7R
1μF Filter High-Frequency, 1.0μF Murata
2.2μF 6.3V Ceramic Chip
Capacitor, ±20%, X5R
4.7μF 16V Ceramic Chip
Capacitor, +80/-20%, Y5V
10μF 16V Ceramic Chip
Capacitor, ±20%, X7R
100μF 10V Tantalum Chip
Capacitor, ±10%
Analog-to-Digital Converter
Microcontroller
Linear Voltage Regulator, +3.3V
Copyright © 2005–2011, Texas Instruments Incorporated
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Appendix A
Section A.3. The
MFG. PART NUMBER
ERJ-3GEY0R00V
ERJ-8GEYJ200V
ERJ-3GEYJ330V
ERJ-3GEYJ101V
ERJ-3GEYJ221V
ERJ-3GEYJ152V
ERJ-3GEYJ103V
ERJ-3EKF2002V
ERJ-3GEYJ473V
3362U-1-204LF
ERJ-3EKF2213V
C1608C0G1H220J
ECH-U1C101GX5
NFM21CC101U1H3D
C1608X7R1H103K
C1608X7R1H104K
ECH-U1C104GX5
C1608X7R1C105K
NFM21PC105B1C3D
C1608X5R0J225M
C2012Y5V1C475Z
C3216X7R1C106M
T494D107K010AT
ADS1232IPW
MSP430F449IPZ
TPS77133DGKG4
Schematic and Layout
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