BL15721A BELLING | Alldatasheet

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/boxshadowdwn Meter-Bus Transceiver (for Slave) Meets Standard EN-1434-3 /boxshadowdwn Adjustable Constant-Current Sink via Resister /boxshadowdwn Receiver Logic With Dynamic Level Recognition /boxshadowdwn Module Supply Voltage Switch /boxshadowdwn 3.3V Constant Voltage Source /boxshadowdwn Remote Powering /boxshadowdwn Polarity Independent /boxshadowdwn Power Fail Function /boxshadowdwn Up to 9600 Baud in Half Duplex for UART Protocol /boxshadowdwn 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 /boxshadowdwn 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 Package Packing Tape & Reel BL15721A SOP16 Tube

http://www.belling.com.cn - Page 2 of 11 - Ver1.0 Pin Diagram Block Diagram Pin Description Pin # Name Description

1 BUSL2 Meter-Bus

2 VB Differential bus voltage after rectifier

3 STC Support capacitor

4 RIDD Current adjustment input

5 RF Power fail output

6 SC Sampling capacitor

7 TXI Data output inverted

8 TX Data output

9 BAT Logic level adjust

10 VS Switch for bus or battery supply output

11 VDD Voltage regulator output

12 RX Data input

13 RXI Data input inverted

14 RIS Adjust input for modulation current

15 GND Ground

16 BUSKL1 Meter-Bus

the SC pin is used for the voltage comparator TC3 (see Figure 1). Figure 1. Data Transmission, Master to Slave in addition to the current source CS3 during the modulation time. outputs TX and TXI, which indicates the data collision to the slave. The bus topology requires a constant current consumption by each connected slave.

http://www.belling.com.cn - Page 6 of 11 - Ver1.0 Power Fail Function Because of the rectifier bridge BR at the input, BUSL1, and BUSL2, the BL15721A is polarity independent. The pin VB to ground (GND) delivers the bus voltage V VB less the voltage drop over the rectifier BR. The voltage comparator TC2 monitors the bus voltage. If the voltage V VB > V STC + 0.8 V, then the output PF = 1. The output level PF = 0 (power fail) provides a warning of a critical voltage drop to the microcontroller to save the data immediately. Absolute Maximum Ratings Over operating free-air temperature range(unless otherwise noted) VMB Voltage, BUSL1 to BUSL2 ±50V RX and RXI –0.3 V to 5.5 V VI Input voltage range BAT –0.3 V to 5.5 V TA Operating free-air temperature range –25° C to 85° C TSTG Storage temperature range –65° C to 150° C Recommended Operating Conditions (note1) Min Max Unit Receiver 10.8 42 VMB Bus voltage, |BUSL2-BUSL1| Transmitter 12 42 V VB(receive mode) 9.3 VI Input voltage BAT(note2) 2.5 3.8 V R RIDD RIDD resistor 13 80 KΩ R RIS RIS resistor 100 Ω TA Operating free-air temperature -25 85 ℃ Note1: All voltage values are measured with respect to the GND terminal unless otherwise noted. Note2: V BAT (max) ≤ V STC – 1 V Electrical Characteristics(note1) over operating free-air temperature range (unless otherwise noted) Spec Symbol Parameter Conditions Min. Typ. Max. Unit ∆VBR Voltage drop at rectifier BR IBUS = 3 mA 1.03 1.5 V ∆VCS1 Voltage drop at current source CS1 R RIDD = 13 k Ω 0.95 1.8 V R RIDD = 13 k Ω 2.84 3.3 IBUS BUS current VSTC =6.5V, IMC =0mA R RIDD = 30 k Ω 1.34 1.8 mA ∆IBUS BUS current accuracy ∆VBUS = 10V, I MC = 0 mA, R RIDD = 13 k Ω to 30 k Ω 2 % ICC Supply current VSTC = 6.5 V, I MC = 0 mA, V BAT =

3.8 V, R RIDD = 13 k Ω(note2)

480 650 µA

http://www.belling.com.cn - Page 7 of 11 - Ver1.0 ICL1 CI1 current VSTC = 6.5 V, I MC = 0 mA, V BAT = 3.8 V, R RIDD = 13 k Ω, V BUS = 6.5 V, RX/RXI = off (note2) 350 µA IBAT BAT current -0.5 0.5 µA IBAT + I VDD BAT plus VDD current V BUS = 0 V, V STC = 0 V -0.5 0.5 µA VVDD VDD voltage –I VDD = 1 mA, V STC = 6.5 V 3.1 3.25 3.5 V R VDD VDD resistance –I VDD = 2 to 8 mA, V STC = 4.5 V 2 5 Ω VDD = on, VS = on 5.6 6.16 6.4 VDD = off, VS = off 3.4 4.0 4.3 VSTC STC voltage IVDD < I STC_use 6.5 7.18 7.7 V R RIDD =30 k Ω 0.65 1.2 ISTC_use STC current V STC = 5 V R RIDD =13 k Ω 1.85 2.5 mA VRIDD RIDD voltage R RIDD = 30 k Ω 1.23 1.33 V VVS VS voltage VDD = on, I VS = –5 µA V STC -0.4 V STC V R VS VS resistance VDD = off 0.3 1 M Ω VVB = V STC +

1.2 V, I PF =

–100 µA VBAT - 0.6 V BAT VVB = V STC +

0.5 V, I PF = 1

µA 0 0.6 VPF PF voltage V STC =6.5V VVB = V STC +

0.5 V, I PF = 5

µA 0 0.9 V Note1: All voltage values are measured with respect to the GND terminal, unless otherwise noted. Note2: Inputs RX/RXI and outputs TX/TXI are open, ICC = I CI1 + I CI2 Receiver Section Electrical Characteristics(note1) over operating free-air temperature range (unless otherwise noted) Symbol Parameter Conditions Min Typ Max Unit VT MARK- 0.82 MARK- 5.7 V VSC SC voltage V VB V ISCcharge SC charge current VSC = 24 V, V VB = 36 V -15 -24.7 -40 µA ISCdischarge SC discharge current VSC = V VB = 24 V 0.3 -0.033X ISCdischarge µA VOH High-level output voltage (TX, TXI) ITX /I TXI = –100 µA， VBAT - 0.6 V BAT V ITX /I TXI = 100 µA 0 0.47 0.6 VOL Low-level output voltage(TX, I TX = 1.1 mA 0 1.0 1.5 V

http://www.belling.com.cn - Page 8 of 11 - Ver1.0 TXI) ITX I TXI TX, TXI current VTX = 7.5V, V VB = 12 V, V STC = 6V, V BAT = 3.8 V 0 0.8 10 µA Note1: All voltage values are measured with respect to the GND terminal, unless otherwise noted. Transmitter Section Electrical Characteristics(note1) Over operating free-air temperature range(unless otherwise noted) Symbol Parameter Conditions Min Typ Max Unit IMC MC voltage R RIS =100 Ω 11.5 19.5 mA R RIS =100 Ω 1.4 1.7 VRIS RIS voltage R RIS =1000 Ω 1.5 1.8 V VIH High-level input voltage(RX,RXI) See Figure 2(note2) V BAT - 0.8 5.5 V VIL Low-level input voltage(RX,RXI) See Figure 2 0 0.8 V VRX = VBAT = 3V, V VB = VSTC = 0V -0.5 0.5 IRX RX current VRX = 0V, V BAT = 3V, V STC = 6.5 V -10 -40 µA VRXI = V BAT = 3V, V VB = VSTC = 0V 10 40 IRXI RXI current VRXI = V BAT = 3 V, V STC = 6.5 V 10 40 µA Note1: All voltage values are measured with respect to the GND terminal, unless otherwise noted. Note 2 ：V IH (max) = 5.5 V is valid only when V STC > = 6.5 V.

http://www.belling.com.cn - Page 11 of 11 - Ver1.0