Moteur de recherche de fiches techniques de composants électroniques
  French  ▼

Delete All
ON OFF
ALLDATASHEET.FR

X  

Preview PDF Download HTML

SC18IS600 Fiches technique(PDF) 6 Page - NXP Semiconductors

No de pièce SC18IS600
Description  SPI to IC-bus interface
Download  28 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

SC18IS600 Fiches technique(HTML) 6 Page - NXP Semiconductors

Back Button SC18IS600 Datasheet HTML 2Page - NXP Semiconductors SC18IS600 Datasheet HTML 3Page - NXP Semiconductors SC18IS600 Datasheet HTML 4Page - NXP Semiconductors SC18IS600 Datasheet HTML 5Page - NXP Semiconductors SC18IS600 Datasheet HTML 6Page - NXP Semiconductors SC18IS600 Datasheet HTML 7Page - NXP Semiconductors SC18IS600 Datasheet HTML 8Page - NXP Semiconductors SC18IS600 Datasheet HTML 9Page - NXP Semiconductors SC18IS600 Datasheet HTML 10Page - NXP Semiconductors Next Button
Zoom Inzoom in Zoom Outzoom out
 6 / 28 page
background image
SC18IS600_601_3
© NXP B.V. 2006. All rights reserved.
Product data sheet
Rev. 03 — 13 December 2006
6 of 28
NXP Semiconductors
SC18IS600/601
SPI to I2C-bus interface
6.2.1.1
Quasi-bidirectional output configuration
Quasi-bidirectional outputs can be used both as an input and output without the need to
reconfigure the pin. This is possible because when the pin outputs a logic HIGH, it is
weakly driven, allowing an external device to pull the pin LOW. When the pin is driven
LOW, it is driven strongly and able to sink a large current. There are three pull-up
transistors in the quasi-bidirectional output that serve different purposes.
One of these pull-ups, called the ‘very weak’ pull-up, is turned on whenever the pin latch
for the pin contains a logic 1. This very weak pull-up sources a very small current that will
pull the pin HIGH if it is left floating.
A second pull-up, called the ‘weak’ pull-up, is turned on when the pin latch for the pin
contains a logic 1 and the pin itself is also at a logic 1 level. This pull-up provides the
primary source current for a quasi-bidirectional pin that is outputting a 1. If this pin is
pulled LOW by an external device, the weak pull-up turns off, and only the very weak
pull-up remains on. In order to pull the pin LOW under these conditions, the external
device has to sink enough current to overpower the weak pull-up and pull the pin below its
input threshold voltage.
The third pull-up is referred to as the ‘strong’ pull-up. This pull-up is used to speed up
LOW-to-HIGH transitions on a quasi-bidirectional pin when the pin latch changes from a
logic 0 to a logic 1. When this occurs, the strong pull-up turns on for two system clock
cycles quickly pulling the pin HIGH.
The quasi-bidirectional pin configuration is shown in Figure 5.
Although the SC18IS600/601 is a 3 V device, most of the pins are 5 V tolerant. If 5 V is
applied to a pin configured in quasi-bidirectional mode, there will be a current flowing from
the pin to VDD causing extra power consumption. Therefore, applying 5 V to pins
configured in quasi-bidirectional mode is discouraged.
A quasi-bidirectional pin has a Schmitt-triggered input that also has a glitch suppression
circuit.
Fig 5.
Quasi-bidirectional output configuration
002aab882
2 SYSTEM
CLOCK
CYCLES
weak
strong
very
weak
VDD
PP
P
VSS
pin latch data
GPIOn,
IOn pin
glitch rejection
input data


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28 


Fiches technique Télécharger

Go To PDF Page

Numéro de composants électroniques

No de pièceDescriptionHtml ViewFabricant
MU9C8148 SRT Interface 1  2  3  4  5  More MUSIC Semiconductors

Lien URL




Politique de confidentialité
ALLDATASHEET.FR
ALLDATASHEET vous a-t-il été utile ?  [ DONATE ] 

À propos de Alldatasheet   |   Publicité   |   Contactez-nous   |   Politique de confidentialité   |   Echange de liens   |   Fabricants
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn