|
|
PDF BL15721A Data sheet ( Hoja de datos )
| Número de pieza | BL15721A | |
| Descripción | Meter-Bus Transceiver | |
| Fabricantes | BELLING | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de BL15721A (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
|
No Preview Available !
Features
Meter-Bus Transceiver
BL15721A
Meter-Bus Transceiver (for Slave) Meets Standard EN-1434-3
Adjustable Constant-Current Sink via Resister
Receiver Logic With Dynamic Level Recognition
Module Supply Voltage Switch
3.3V Constant Voltage Source
Remote Powering
Polarity Independent
Power Fail Function
Up to 9600 Baud in Half Duplex for UART Protocol
Slave Power Support
– Supply From Meter-Bus via Output VDD
– Supply From Meter-Bus via Output VDD or From Backup Battery
– Supply From Battery – Meter-Bus Active for Data Transmission Only
SOP16 package
General Description
BL15721A is a single chip transceiver developed for Meter-Bus standard (EN1434-3)
applications.
The BL15721A interface circuit adjusts the different potentials between a slave system
and the Meter-Bus master. The connection to the bus is polarity independent and supports
full galvanic slave isolation with optocouplers.
The receiver has dynamic level recognition, and the transmitter has a programmable
current sink.
The circuit is supplied by the master via the bus. Therefore, this circuit offers no additional
load for the slave battery.
The BL15721A integrates a power-fail function. And a 3.3V voltage regulator, with power
reserve for a delayed switch off at bus fault, is integrated.
Order Information
Part Number
BL15721A
Package
SOP16
Packing
Tape & Reel
Tube
http://www.belling.com.cn
- Page 1 of 11 -
Ver1.0
1 page  
BL15721A
RRIDD = value of adjustment resistor
The voltage level of the storage capacitor CSTC is monitored with comparator TC1. Once
the voltage VSTC reaches VVDD_on, the switch SVDD connects the stabilized voltage VVDD to
pin VDD. VDD is turned off if the voltage VSTC drops below the VVDD_off level.
Voltage variations on the capacitor CSTC create bus current changes (see Figure 4).
Figure 4. Single Mode Bus Load
At a bus fault the shut down time of VDD (toff) in which data storage can be performed
depends on the system current IVDD and the value of capacitor CSTC. See Figure 5, which
shows a correlation between the shutdown of the bus voltage VBUS and VDD_off and toff for
dimensioning the capacitor.
The output VS is meant for slave systems that are driven by the bus energy, as well as
from a battery should the bus line voltage fail. The switching of VS is synchronized with
VDD and is controlled by the comparator TC1. An external transistor at the output VS
allows switching from the Meter-Bus remote supply to battery.
Power On/Off
Figure 5. Power On/Off Timing
http://www.belling.com.cn
- Page 5 of 11 -
Ver1.0
5 Page 
Outline Dimension（SOP-16）
BL15721A
http://www.belling.com.cn
- Page 11 of 11 -
Ver1.0
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet BL15721A.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| BL15721A | Meter-Bus Transceiver | BELLING |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |