Motor de Búsqueda de Datasheet de Componentes Electrónicos
  Spanish  ▼
ALLDATASHEET.ES

X  

Preview PDF HTML

PM8800ATR Datasheet(PDF) 16 Page - STMicroelectronics

No. de pieza PM8800ATR
Descripción Electrónicos  Integrated IEEE 802.3af compliant PoE-PD interface and PWM controller with support of external source
PDF  35 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM8800ATR Datasheet(HTML) 16 Page - STMicroelectronics

Back Button PM8800ATR Datasheet HTML 12Page - STMicroelectronics PM8800ATR Datasheet HTML 13Page - STMicroelectronics PM8800ATR Datasheet HTML 14Page - STMicroelectronics PM8800ATR Datasheet HTML 15Page - STMicroelectronics PM8800ATR Datasheet HTML 16Page - STMicroelectronics PM8800ATR Datasheet HTML 17Page - STMicroelectronics PM8800ATR Datasheet HTML 18Page - STMicroelectronics PM8800ATR Datasheet HTML 19Page - STMicroelectronics PM8800ATR Datasheet HTML 20Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 16 / 35 page
background image
PD interface
PM8800A
16/35
5
PD interface
5.1
Detection
In power over Ethernet systems, the PSE senses the connection to detect whether an IEEE
802.3af compatible device is plugged to the cable termination by applying a small voltage
(2.7 to 10 V) on the Ethernet cable and measuring in two successive steps the equivalent
resistance. During this phase, the Powered Device must present a resistance between
23.75 k
Ω and 26.25 kΩ
PM8800A integrates a 24.5 k
Ω signature resistor to simplify the design of PoE powered
Device appliances and to reduce the overall component count.
Signature resistor is in series to a pass transistor (see Figure 7) used to disconnect the
resistor itself upon completion of the detection phase.
The value of the integrated detection resistance has been selected taking into account also
the diode bridges typical voltage drop.
During detection, most of the circuits inside the PM8800A are disabled to minimize the
offset current.
Figure 7.
PM8800A: reference schematic of the integrated 24.5 k
Ω and resistor
disable logic
24.5k
+
-
VIN
VSS
11.5V
PM8800A



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 29 30 31 32 33 34 35


Datasheet Descarga

Go To PDF Page


Enlace URL



¿ALLDATASHEET es útil para Ud.?  [ DONATE ] 

Todo acerca de Alldatasheet   |   Publicidad   |   Contáctenos   |   Política de Privacidad   |   Enlace a la hoja de datos    |   Intercambio de Enlaces   |   Lista de Fabricantes
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
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com