SSP721A

Product Catgories

Short Description:

SSP721A is a single chip transceiver developed for Meter-Bus standard (EN1434-3、EN13757) applications. The SSP721A 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 circuit is supplied by the master via the bus. Therefore, this circuit offers no additional load for the slave battery. A power-fail function is integrated. The receiver has dynamic level recognition, and the transmitter has a programmable current sink. A 3.3V voltage regulator, with power reserve for a delayed switch off at bus fault, is integrated.

Tags: Active component, Communication & Interface Circuit, Electronic components, Integrated circuit, M bus, Transceiver IC

Product Detail

Features

Meter-Bus Transceiver (for Slave) Meets Standard EN1434-3、EN13757
Receiver Logic With Dynamic Level Recognition
Adjustable Constant-Current Sink via Resistor
Polarity Independent
Power-Fail Function
Module Supply Voltage Switch
3.3-V Constant Voltage Source
Remote Powering
Up to 9600 Baud in Half Duplex for UART Protocol
Support multiple slave power supply modes
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；

SOP-16Package

Applications

M-BUS remote meter reading slave station
M-BUS security slave station
M-BUS smart home slave station

Parameter table

Absolute Maximum Ratings

Unless specified otherwise, T_A=25℃

Parameter		Symbol	Value	Unit
Bus voltage(BUSL2-BUSL1)		VMB	±50	V
Input voltage range	Data input	RX	-0.3～5.5	V
	Data input inverted	RXI	-0.3～5.5	V
	Logic level adjust	BAT	-0.3～5.5	V
Operating junction temperature range		T_J	-25～150	℃
Operating free-air temperature range		T_A	-25～85	℃
Storage temperature range		T_STG	-65～150	℃
Power derating factor, junction to ambient			8	mW/℃

Electrical Characteristics

Symbol	Parameter	Test Conditions				Min	Typ	Max	Unit
△V_BR	Voltage drop at rectifier BR	I_BUS=3mA						1.5	V
△V_CS1	Voltage drop at current source CS1	R_RIDD=13kΩ						1.8	V
I_BUS	BUS current	V_STC=6.5V, I_MC=0mA			R_RIDD=13kΩ			3	mA
I_BUS	BUS current	V_STC=6.5V, I_MC=0mA			R_RIDD=30kΩ			1.5	mA
△I_BUS	BUS current accuracy	△V_BUS=10V, I_MC=0mA，R_RIDD=13～30kΩ						2	%
I_CC	Supply current	V_STC=6.5V, I_MC=0mA，_BAT=3.8V, R_RIDD=13kΩ⁽²⁾						650	μA
I_CI1	CI1current	V_STC=6.5V, I_MC=0mA，_BAT=3.8V, R_RIDD=13kΩ，_BUS=6.5V, RX/RXI=off⁽²⁾						350	μA
I_BAT	BAT current	V_BAT=3.8V				-0.5		0.5	μA
I_BAT=I_VDD	BAT plus VDD current	V_BUS=0V, V_STC=0V				-0.5		0.5	μA
V_VDD	VDD voltage	-I_VDD=1mA, V_STC=6.5V				3.1		3.4	V
R_VDD	VDD resistance	-I_VDD=2～8mA, V_STC=4.5V						5	Ω
V_CTC	STC voltage	V_DD=on, VS=on				5.6		6.4	V
		V_DD=off, VS=off				3.8		4.3
		I_VDD﹤I_STC__USE				6.5		7.5
I_STC_U_SE	STC current	V_STC=5V		R_RIDD=13kΩ		1.85		2.4	mA
I_STC_U_SE	STC current	V_STC=5V		R_RIDD=30kΩ		0.65		1.1	mA
V_RIDD	RIDD voltage	R_RIDD=30kΩ				1.23		1.33	V
V_VS	VS voltage	V_DD=on, I_VS=-5μA				V_BAC-0.4		V_BAC	V
R_VS	VS resistance	V_DD=off				0.3		1	MΩ
V_PF	PF voltage	V_STC=6.5V	V_VB=V_STC+0.8V, I_PF=-100μA			V_BAT-0.6		V_BAT	V
			V_VB=V_STC+0.3V, I_PF=1μA			0		0.6
			V_VB=V_SC+0.3V, I_PF=5μA			0		0.9
t_on	Turn-on time	C_STC=50μF, Bus voltage slew rate: 1V/μs						3	s

Note 1：All voltage values are measured with respect to the GND terminal, unless otherwise noted.

Note 2：Inputs RX/RXI and outputs TX/TXI are open, I_CC=I_CI1+I_CI2.

Receiver Section Electrical Characteristics⁽¹⁾

Symbol	Parameter	Test Conditions	Min	Typ	Max	Unit
V_T		See Figure 1	MARK-8.2		MARK-5.7	V
V_SC	SC voltage				VVB	V
I_SC__charge	SC charge current	V_SC=24V,V_VB=36V	-15		-40	μA
I_SC__discharge	SC discharge current	V_SC=V_VB=24V	0.3		-0.033×I_SC__charge	μA
V_OH	TX/TXI High-level output voltage	I_TX/I_TXI=-100μA	V_BAT-0.6		V_BAT	V
V_OL	TX/TXI Low-level output voltage	I_TX/I_TXI=100μA	0		0.5	V
V_OL	TX/TXI Low-level output voltage	I_TX=1.1mA	0		1.5	V
I_TX/I_TXI	TX/TXI current	V_TX=7.5V,V_VB=12V,V_STC=6V,V_BAT=3.8V			10	μA

Note: All voltage values are measured with respect to the GND terminal, unless otherwise noted.

Transmitter Section Electrical Characteristics⁽¹⁾

Symbol	Parameter	Test Conditions	Min	Typ	Max	Unit
I_MC	MC current	R_RIS=100Ω	11.5		19.5	mA
V_RIS	RIS voltage	R_RIS=100Ω	1.4		1.7	V
V_RIS	RIS voltage	R_RIS=1kΩ	1.5		1.8	V
V_IH	RX/RXI High-level input voltage	See Figure 2⁽²⁾	V_BAT-0.8		5.5	V
V_IL	RX/RXI Low-level input voltage	See Figure 2	0		0.8	V
I_RX	RX current	V_RX=V_BAT=3V, V_VB=V_STC=0V	-0.5		0.5	μA
I_RX	RX current	V_RX=0,V_BAT=3V, V_STC=6.5V	-10		-40	μA
I_RXI	RXI current	V_RXI=V_BAT=3V,V_VB=V_STC=0V	10		40	μA
I_RXI	RXI current	V_RXI=V_BAT=3V,V_STC=6.5V	10		40	μA

Note 1：All voltage values are measured with respect to the GND terminal, unless otherwise noted.

Note 2：VIH(max) = 5.5 V is valid only when VSTC > 6.5 V.

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Parameter table

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SSP721A

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