User manual

MCP3421 Weight Scale Demo Board User’s Guide
DS51918A-page 24  2010 Microchip Technology Inc.
8 R13, R14,
R15, R19,
R27, R32,
R33, R34
RES 1.50K OHM 1/10W 1% 0603
SMD
Yageo Corporation RC0603FR-071K5L
2 R17, R18 RES 10.0K OHM 1/10W 1% 0603
SMD
Panasonic – ECG ERJ-3EKF1002V
1 R20 RES 332 OHM 1/10W 1% 0603 SMD Panasonic – ECG ERJ-3EKF3320V
2 R21, R22 RES 24.9 OHM 1/10W 1% 0603 SMD Panasonic – ECG ERJ-3EKF24R9V
1 R23 DO NOT POPULATE — —
1 R24 RES 523 OHM 1/10W 1% 0603 SMD Panasonic – ECG ERJ-3EKF5230V
1 R25 RES 4.70K OHM 1/10W 1% 0603
SMD
Panasonic – ECG ERJ-3EKF4701V
2 R26, R28 RES 47.0K OHM 1/10W 1% 0603
SMD
Panasonic – ECG ERJ-3EKF4702V
2 R29, R30 RES 2.20K OHM 1/10W 1% 0603
SMD
Panasonic – ECG ERJ-3EKF2201V
3 R31, R35,
R37
RES 220 OHM 1/10W 1% 0603 SMD Panasonic – ECG ERJ-3EKF2200V
3 R36, R38,
R39
RES 1.00K OHM 1/10W 1% 0603
SMD
Panasonic – ECG ERJ-3EKF1001V
4 S2, S3, S4,
S5
SWITCH LT TOUCH 6X3.5 100GF
SMD
Panasonic – ECG EVQ-PJS04K
1 U1 MCP3421 SOT-23_6L A0 Microchip Technology
Inc.
MCP3421A0T-E/CH
1 U2 PIC18F4550 TQFP44 Microchip Technology
Inc.
PIC18F4550-I/PT
1 U4 MCP1702 SOT23A 5V CMOS low
dropout positive voltage regulator
Microchip Technology
Inc.
MCP1701T-5002I/CB
1 U5 MCP6V02 SOIC8 Linear High Preci-
sion Op Amps-Auto Zero
Microchip Technology
Inc.
MCP6V07-E/SN
1 USB1 CONN RECEPT MINI USB2.0 5POS Hirose Electric Co., Ltd. UX60-MB-5ST
1 X1 CRYSTAL 20MHZ METAL CASE
SMD
Connor-Winfield XM-1-20.0000
TABLE B-1: BILL OF MATERIALS (BOM) (CONTINUED)
Qty Reference Description Manufacturer Part Number
Note 1: The components listed in this Bill of Materials are representative of the PCB assembly. The
released BOM used in manufacturing uses all RoHS-compliant components.