SSP1851

Product Catgories

Short Description:

The SSP1851 is a high-accuracy, fault-tolerant electrical energy measurement IC that is intended for use with 2-wire distribution systems. The part specifications surpass the accuracy requirements as quoted in the IEC1036 standard. The only analog circuitry used in the SSP1851 is in the ADCs and reference circuit. All other signal processing (e.g., multiplication and filtering) is carried out in the digital domain. This approach provides superior stability and accuracy over extremes in environmental conditions and over time. The SSP1851 incorporates a novel fault detection scheme that warns of fault conditions and allows the SSP1851 to continue accurate billing during a fault event. The SSP1851 does this by continuously monitoring both the phase and neutral (return) currents. A fault is indicated when these currents differ by more than 12.5%. Billing is continued using the larger of the two currents. The SSP1851 supplies average real power information on the low-frequency outputs F1 and F2. These logic outputs may be used to directly drive an electromechanical counter or interface to an MCU. The CF logic output gives instantaneous real power information. This output is intended to be used for calibration purposes. The SSP1851 includes a power supply monitoring circuit on the AVDD supply pin. The SSP1851 will remain in a reset condition until the supply voltage on AVDD reaches 4 V. If the supply falls below 4 V, the SSP1851 will also be reset and no pulses will be issued on F1, F2, and CF. Internal phase matching circuitry ensures that the voltage and current channels are matched whether the HPF in Channel 1 is on or off. The SSP1851 also has anticreep protection. The SSP1851 is available in 24-lead SSOP packages.

Tags: Energy measurement chip, On-Chip Fault Detection, Power Metering Chip, Power Metering Circuit Solutions

Product Detail

Features

High Accuracy, Surpasses 50 Hz/60 Hz IEC 687/1036.Less than 0.1% Error over a Dynamic Range of 500 to 1
Supplies Average Real Power on the Frequency Outputs F1 and F2
High-Frequency Output CF Is Intended for Calibration and Supplies Instantaneous Real Power
Continuous Monitoring of the Phase and Neutral Current Allows Fault Detection in 2-Wire Distribution Systems
SSP1851 Uses the Larger of the Two Currents (Phase or Neutral) to Bill—Even During a Fault Condition
Two Logic Outputs (FAULT and REVP) Can Be Used to Indicate a Potential Miswiring or Fault Condition
Direct Drive for Electromechanical Counters and 2-Phase Stepper Motors (F1 and F2)
A PGA in the Current Channel Allows the Use of Small Values of Shunt and Burden Resistance
Proprietary ADCs and DSP Provide High Accuracy over Large Variations in Environmental Conditions and Time
On-Chip Power Supply Monitoring
On-Chip Creep Protection (No Load Threshold)
On-Chip Reference 2.5 V ±8% (30 ppm/℃ Typical) with External Overdrive Capability
chip contains a highly stable oscillator with little sensitivity to temperature
Single 5 V Supply, Low Power (15 mW Typical)
Low-cost CMOS process.
SSOP24 package

Applications

Smart meter

Parameter table

Absolute Maximum Ratings

Parameter name	Symbolic	Value	Unit
Chip Supply Voltage	VDD	-0.3～+7	V
Analogue Signal Inputs	V1A,V1B,V1N,V2N,V2P Voltage to GND	-6～+6	V
Reference Input Voltage		-0.3～VDD+0.3	V
Digital Input Voltage		-0.3～VDD+0.3	V
Digital Output Voltages		-0.3～VDD+0.3	V
Operating Temperature Range	T	-40～+85	℃
Storage Temperature Range	Tstg	-40～+85	℃
Conjugate Temperature	Tj	+150	℃
SSOP24 Package Power Dissipation	Pd	450	mW
Thermal Resistance		112	℃/W
Vapour Phase Welding（60S）		+215	℃
Infrared soldering（15S）		+220	℃

Note: Unless otherwise specified, TA = 25℃.

Electrical Characteristics

Measurement items	symbolic	Measurement Conditions	Min	Typical	Max	Unit
Chip Operating Voltage	VDD		4.75	5	5.25	V
Chip Working Current	I_DD			3	4	mA
Measurement error for channel 1		Channel 2 is full-scale input (±600mV), +25℃, G=1, dynamic range 500:1		0.1		%
Measurement error for channel 1		Channel 2 is full-scale input (±660mV), +25℃, G=16, dynamic range 500:1		0.1		%
Phase Error Between Two Channels		Line frequency 45-65Hz,, AC/DC = 0 and AC/DC = 1, V1 overrun 37° (PF = 0.8 capacitive)		±0.1		%
Phase Error Between Two Channels		Line frequency 45-65Hz, AC/DC=0 and AC/DC=1, V1 lag 60° (PF=0.5 inductive)		±0.1		%
AC power supply suppresses output frequency variations（CF）		AC/DC=1, S0=S1=1, G0=G1=0, V1=V2=100mVrms, 50Hz, VDD plus 200 mV rms, 100Hz ripple		0.2		%
DC power supply suppresses output frequency variations（CF）		AC/DC=1，S0=S1=1，G0=G1=0，V1=V2=100mVrms，VDD =5V±250mV		±0.3		%
FAULT DETECTION
Fault Detection Threshold		V1A or V1B Active		12.5		%
Fault Detection Input Swap Threshold		V1A or V1B Active		14		%
Accuracy Fault Mode Operation		V1A Active,V1B=AGND,Dynamic Range 500 to 1		0.1		%
Accuracy Fault Mode Operation		V1B Active,V1B=AGND,Dynamic Range 500 to 1		0.1		%
Accuracy Fault Mode Operation				3		S
Analogue Inputs
Max Signal Level		V1A,VIB,V1N,V2N and V2P to GND			±1	V
DC Input Resistance		CLKOSC=3.58MHz	390			kΩ
-3dB bandwidth		CLKOSC/256，CLKOSC=3.58MHz		14		KHZ
ADC misalignment error					±16	mV
Gain error		External reference source 2.5V, G=1 V1=660mV dc, V2=660mV dc		±5	±8	%
Gain matching error		External reference source 2.5V		±0.2		%
Reference Input
REF_IN/OUTInput Voltage Range			2.3	2.5	2.7	V
Input Impedance			3.2			kΩ
Input capacitance					10	pF
On-chip reference source
Reference Voltage Error		Nominal value 2.5V			±200	mV
Temperature coefficient		Nominal value 2.5V		±30		ppm/℃
Clock Input
Input Clock Frequency		All indicators CLKOSC is 3.58MHz	1		4	MHZ
Logical input SCF，S0，S1，AC/DC，RESET(______________)，G0和G1
Input High Level	V_INH	VDD=5V±5%	2.4
Input Low Level	V_INL	VDD=5V±5%			0.8
Input Current		V_IN=0V至VDD		0.01	±3	μA
Input capacitance					10	pF
Logic output F1，F2
Output High Level	V_OH	I_SOURCE=10mA，VDD=5V	4.5			V
Output Low Level	V_OL	I_SINK=10mA，VDD=5V			0.5	V
CF，REVP
Output High Level	V_OH	I_SOURCE=10mA，VDD=5V	4			V
Output Low Level	V_OL	I_SINK=10mA，VDD=5V			0.5	V

Note: TA = 25℃ unless otherwise specified.

All voltage values use the GND terminal potential as a reference point.

VDD= 5V±5%, GND=0V, using on-chip reference source, CLKOSC=3.58MHz.

Order Specification

product model	package	manner of packing	Minimum packing quantity
SSP1851	SSOP24	Tube	60PCS

SSP1851

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