PSAS/ CapstoneLV2bProjectReport/ ComponentSpec/ Glue

ARM 7 microcontroller (U280)

Part Description:

Purpose:

Specifications/ Calculations:


Power decoupling (C285, 286, 287, 288, 291, 292, 293, 294)

C285, C286, C287, C288, C291, C292, C293, C294

Part Description:

Purpose:

Specifications/ Calculations:


USB filtering block

The following figure illustrates the USB filtering block.

gnl schem usb.png

Fig. Glue.1

Driver impedance matching resistors (R281, R282)

Part Description:

Purpose:

Specifications/ Calculations:

Edge rate control capacitor (C289, C290)

Part Description:

Purpose:

Specifications/ Calculations:

USB Full Speed Select (R291)

Part Description:

Purpose:

Specifications/ Calculations:

USB Port Transient Suppressor (U282)

Part Description:

Purpose:

Specifications/ Calculations:

sn65220 1.png Image from TI SN65220 datasheet

Fig. Glue.2

sn65220 2.png Image from TI SN65220 datasheet

Fig. Glue.3

EMI/RF Filter (L281, L282)

Part Description:

Purpose:

Specifications/ Calculations:

exccet.png Image from Panasonic EXCCET data sheet

Fig. Glue.4

IO Power and Ground

Purpose:


Power-on reset

Microcontroller Supervisory Circuit (U283)

Part Description:

Purpose:

Specifications/ Calculations:

mcp130 2 2.png Image from Microchip MCP130 datasheet

Fig. Glue.5

mcp130 1 1.png Image from Microchip MCP130 datasheet

Fig. Glue.6


Oscillator and divider

gnl schem osc.png

Fig. Glue.7

Frequency control crystal (X281)

Part Description:

Purpose:

Specifications/ Calculations:

Philips requires for 10 to 15 MHz range

Citizen crystal provides

CL (crystal load capacitance): 20 pF

18 pF

RS (max series resistance): < 220 ohm

50 ohm

Frequency tolerance

50 ppm

Footprint

6.0 mm x 3.3 mm

Oscillator load capacitors (C281, C282)

C281

Part Description:

Purpose:

Specifications/ Calculations:

C282

Part Description:

Purpose:

Specifications/ Calculations:

Having the nominal capacitance of CX1, and CX2 being slightly unequal provides an increased energy efficiency in the oscillator according to Tim.

Binary ripple counter (U281)

Part Description:

Purpose:

Specifications/ Calculations:

cd4024.png Image from TI CD4024 datasheet

Fig. Glue.8


RTC crystal oscillator

Oscillator load capacitors (C283, C284)

C283
C284

Part Description:

Purpose:

Specifications/ Calculations:

Frequency control crystal (X282)

Part Description:

Purpose:

Specifications/ Calculations:

Philips requires

Citizen crystal provides

CL (crystal load capacitance): 13 pF

12.5 pF

RS (max series resistance): < 100k ohm

70 k ohm

Frequency tolerance

+/- 20 ppm

Footprint

4.1 mm x 1.5 mm

Power to oscillator


Debug port

Connector (CM201)

Part Description:

Purpose:

Specifications/ Calculations:

Pull up/down resistors (R283, 284, 285, 286, 287, 288)

Part Description:

Purpose:

Specifications/ Calculations:


Power Good and Shutdown

Power Good

Purpose:

Specifications/ Calculations:

Power Shutdown

Purpose:

Specifications/ Calculations:


Breakout of signals to application specific area

Purpose:

Specifications/ Calculations:


Status LEDs

Red LED (D281)

Part Description:

Purpose:

Specifications/ Calculations:

Vf

at I

2.1V

20 mA

Green LED (D282)

Part Description:

Purpose:

Specifications/ Calculations: Connected to general purpose output pin P1.16; Called Status 1.

Vf

at I

2.1V

20 mA

Current limit resistors (R289, R290)

R289
R290

Part Description:

Purpose:

Specifications/ Calculations:


Test points

SPS Off

Pwr Good

1.5 MHz (SPS Sync)

Purpose:

Specifications/ Calculations:


Configuration trace-cuts or solder jumpers

Analog VREF

RTC Power (VBAT)

Purpose:

Specifications/ Calculations:


Bill of materials (BOM)

Following are the components needed to construct the Glue section of the board.

Qty

Digi Key SKU

Cust ID

Part

Mfgr

Description

Mfg Num

Price

Stock

Package

Order Size

Data Sheet

5

568-1765-ND

PSAS-GLUE

U280

Philips

ARM7 Microcontroller

LCP2148FBD64-S

11.88

86

64-LQFP

each

Datasheet

5

296-12760-1-ND

PSAS-GLUE

U281

TI

7-stage CMOS ripple counter

CD4024BPWR

0.50

3020

14-TSSOP

each

Datasheet

5

296-9694-1-ND

PSAS-GLUE

U282

TI

USB port transient suppressor

SN65220DBVR

0.84

-

SOT-23-6

each

Datasheet

5

MCP130T-315I/TTCT-ND

PSAS-GLUE

U283

Microchip

Microcontroller Supervisory Circuit

MCP130T

0.48

100

SOT-23-3

each

Datasheet

5

PSAS-GLUE

J281

JST

JST-08PS-JED

each

5

PSAS-GLUE

J282

JST

JST-16PS-JED

each

5

300-8089-1-ND

PSAS-GLUE

X281

Citizen

12 MHz Surface Mount Crystal - Fundamental Mode

CS10

1.65

-

CS10

each

Datasheet

* 5

300-8193-1-ND

PSAS-GLUE

X282

Citizen

32.768 kHz Surface Mount Crystal - Tuning Fork

CM415-32.768KDZFTR

2.10

1122

CM415

each

Datasheet

5

PCC390CGCT-ND

PSAS-GLUE

C281

Panasonic

Chip NP0 39 pF

0.49

-

0805

10 pack

5

PCC330CGCT-ND

PSAS-GLUE

C282

Panasonic

Chip NP0 33 pF

0.49

-

0805

10 pack

10

PCC220CNCT-ND

PSAS-GLUE

C283,284

Panasonic

Chip NP0 22 pF

0.69

-

0805

10 pack

30

PCC103BNCT-ND

PSAS-GLUE

Note(1) C285,286,287,288,291,292,293,294

Panasonic

Chip X7R 10 nF

0.54

-

0805

10 pack

10

PCC180CNCT-ND

PSAS-GLUE

C289,290

Panasonic

Chip NP0 18 pF

0.60

-

0805

10 pack

10

P9829CT-ND

PSAS-GLUE

L281,282

Panasonic

Chip EMI Filter Type EXCCET

EXC-CET471U

0.685

C type

10 pack

Datasheet

10

P33.2CCT-ND

PSAS-GLUE

R281,282

Panasonic

Chip 1% Thick film

0805

10 pack

30

P10.0KCCT-ND

PSAS-GLUE

R283,284,285,286,287,288

Panasonic

Chip 1% Thick film

0805

10 pack

* 10

P604CCT-ND

PSAS-GLUE

R289,290

Panasonic

Chip 1% Thick film

0805

10 pack

5

BSS123NCT-ND

PSAS-GLUE

Q282

Fairchild

Logic level N-channel

BSS123

0.36

0

SOT-23

each

* 5

L71516CT-ND

PSAS-GLUE

D281

LED Red

SOT-23

each

* 5

L71508CT-ND

PSAS-GLUE

D282

LED Green

SOT-23

each

* 5

P1.50KCCT-ND

PSAS-GLUE

R291

Panasonic

Chip 1% Thick film

0805

10 pack

NOTES: (1) C285, 286, 287, 288, 291, 292 should be a 100 nF cap, not 10 nF.

"*" Needs to be ordered