Circuit Negma

C++, C, VB.NET, PCB, Electronics, Circuit Design

Posts Tagged ‘Hardware’

Pin Configuration :: PIC 40-pin Families

Posted by Circuit Negma on June 23, 2008


Created By: Hussein Nosair

Pin Configurations of the Microchip 40-pin families

1 Instruction Cycle = 4 pulses

1 Instruction Cycle = 4 clocks

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PIN Configuration: PIC16F877 (40pins) Vs. PIC18F4520 (40pins)

Posted by Circuit Negma on June 18, 2008


Created By: Hussein Nosair

PIC16F877 PIC18F4520
PIN NUM. PIN NAME PIN NAME
1 MCLR/VPP MCLR/VPP/RE3
2 RA0/AN0 RA0/AN0
3 RA1/AN1 RA1/AN1
4 RA2/AN2/VREF-/CVREF RA2/AN2/VREF-/CVREF
5 RA3/AN3/VREF+ RA3/AN3/VREF+
6 RA4/T0CKI/C1OUT RA4/T0CKI/C1OUT
7 RA5/AN4/SS/C2OUT RA5/AN4/SS/HLVDIN/C2OUT
8 RE0/RD/AN5 RE0/RD/AN5
9 RE1/WR/AN6 RE1/WR/AN6
10 RE2/CS/AN7 RE2/CS/AN7
11 VDD VDD
12 VSS VSS
13 OSC1/CLKI OSC1/CLKI/RA7
14 OSC2/CLKO OSC2/CLKO/RA6
15 RC0/T1OSO/T1CKI RC0/T1OSO/T13CKI
16 RC1/T1OSI/CCP2 RC1/T1OSI/CCP2
17 RC2/CCP1 RC2/CCP1/P1A
18 RC3/SCK/SCL RC3/SCK/SCL
19 RD0/PSP0 RD0/PSP0
20 RD1/PSP1 RD1/PSP1
21 RD2/PSP2 RD2/PSP2
22 RD3/PSP3 RD3/PSP3
23 RC4/SDI/SDA RC4/SDI/SDA
24 RC5/SDO RC5/SDO
25 RC6/TX/CK RC6/TX/CK
26 RC7/RX/DT RC7/RX/DT
27 RD4/PSP4 RD4/PSP4
28 RD5/PSP5 RD5/PSP5/P1B
29 RD6/PSP6 RD6/PSP6/P1C
30 RD7/PSP7 RD7/PSP7/P1D
31 VSS VSS
32 VDD VDD
33 RB0/INT RB0/INT0/FLT0/AN12
34 RB1 RB1/INT1/AN10
35 RB2 RB2/INT2/AN8
36 RB3/PGM RB3/AN9/CCP2
37 RB4 RB4/KBI0/AN11
38 RB5 RB5/KBI1/PGM
39 RB6/PGC RB6/KBI2/PGC
40 RB7/PGD RB7/KBI3/PGD

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Glossary 2 :: SIDACTOR

Posted by Circuit Negma on June 12, 2008


Created By: Hussein Nosair

VDRM (Peak Off-state Voltage) : Maximum voltage that can be applied while maintaining OFF state.

IDRM (Leakage Current) : Maximum peak OFF-state current measured at VDRM (Peak OFF-state Voltage).

VS (Switching Voltage) : Maximum voltage prior to switching to ON state.

IS MAX (Switching Current) : Maximum current required to switch to ON state.

VT MAX (ON state Voltage) : Maximum voltage measured at rated ON state current.

IH MIN (Holding Current) : Minimum current required to maintain ON state.

CO MIN (Minimum OFF-state Capacitance) : Minimum capacitance measured in OFF state.

CO MAX (Maximum OFF-state Capacitance) : Maximum capacitance measured in OFF state.

IPP (Peak Pulse Current) : Maximum rated peak impulse current.

ITSM (Peak One-cycle Surge Current) : Maximum rated one-cycle AC current.

di/dt MAX (Rate of Rise of Current) : Maximum rated value of the acceptable rate of rise in current over time.

Switch to ON STATE :

V <= VS @ I <= IS MAX

Maintain ON STATE :

Von <= VT MAX @ Ion >= IH MIN

OFF STATE :

V <= VDRM @ I <= IDRM

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Glossary 1

Posted by Circuit Negma on June 12, 2008


Created By: Hussein Nosair

VDRM = maximum repetitive peak-off state voltage
VRRM = maximum repetitive peak reverse voltage
ITGQM = maximum repetitive controlable on-state current
Cs = snubber capacity
IT(RMS) = RMS on-state current
ITAVm = maximum average on-state current (50 Hz half sine wave)
ITSM = maximum surge on-state current, nonrepetitive (50 Hz half sine wave)
(diT/dt)cr = critical rate of rise of on-state current
(dvD/dt)cr = critical rate of rise of off-state voltage
I2t = maximum rated value I2t
VTM = peak on-state voltage
VTO = threshold voltage
rT = slope resistance (on-state)
IGT = gate trigger current
VGT = gate trigger voltage
tGQ = turn-off time
TjM = maximum junction temperature
Tj = junction temperature = TjM unless otherwise indicated
Tc = case temperature
m = mass
Fp = pressure force

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Switching-Mode Power Supply Design Tutorial

Posted by Circuit Negma on March 19, 2008


A switching-mode power supply is a power supply that provides the power supply function through low loss components such as capacitors, inductors, and transformers — and the use of switches that are in one of two states, on or off. The advantage is that the switch dissipates very little power in either of these two states and power conversion can be accomplished with minimal power loss, which equates to high efficiency. The term switchmode was widely used for this type of power supply until Motorola, Inc., who used the trademark SWITCHMODE TM for products aimed at the switching-mode power supply market, started to enforce their trademark. Then more generic terms had to be found. I started using the term switching-mode power supply to avoid infringing on the trademark. Others used the term switching power supply, which seems to be the more popular term. PSMA does not define either switching-mode power supply or switching power supply, but does define switching regulator.

Switching-mode power supply design tutorial by Jerrold Foutz

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