SSP1852

Short Description:

The SSP1852 is a high accuracy polyphase electrical energy measurement IC. The part specifications surpass the accuracy requirements as quoted in the IEC62053-2x standard. The only analog circuitry used in the SSP1852 is in the analog-to-digital converters (ADCs) and reference circuit. All other signal processing (such as multi-plication, filtering, and summation) is carried out in the digital domain. This approach provides superior stability and accuracy over extremes in environmental conditions and over time. The SSP1852 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 to interface with an MCU. The CF logic output gives instanta-neous real power information. This output is intended to be used for calibration purposes. The SSP1852 includes a power supply monitoring circuit on the VDD pin. The SSP1852 remains inactive until the supply voltage on VDD reaches 4 V. If the supply falls below 4 V, no pulses are issued on F1, F2, and CF. Internal phase matching circuitry ensures that the voltage and current channels are phase matched. An internal no load threshold ensures the part does not exhibit any creep when there is no load. The SSP1852 is available in a 24-lead SOIC package.

Tags: Anolog IC, Chip, energy metering, Integrated circuit, Power metering circuit

Product Detail

Features

High accuracy, supports 50 Hz/60 Hz IEC62053-2x
Less than 0.1% error over a dynamic range of 500 to 1
Compatible with 3-phase/3-wire delta and 3-phase/4-wire Wye configurations
The SSP1852 supplies average real power on frequency outputs F1 and F2
High frequency output CF is intended for calibration and supplies instantaneous real power
Logic output REVP indicates a potential miswiring or negative power for each phase
Direct drive for electromechanical counters and 2-phase stepper motors (F1 and F2)
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 2.4 V ±8% (30 ppm/°C typical) with external overdrive capability
Single 5 V supply, low power 33 mW typical
Low cost CMOS process

Applications

Smart Meter

Parameter table

Absolute Maximum Ratings

Parameter	Rating
VDD to AGND	−0.3 V to +7 V
VDD to DGND	−0.3 V to +7 V
Analog Input Voltage to AGND (VAP, VBP, VCP, VN, IAP, IAN, IBP, IBN, ICP, and ICN)	−6 V to +6 V
Reference Input Voltage to AGND	−0.3 V to V + 0.3 V DD
Digital Input Voltage to DGND	−0.3 V to V + 0.3 V DD
Digital Output Voltage to DGND	−0.3 V to V + 0.3 V DD
Operating Temperature Range Industrial	−40°C to +85°C
Storage Temperature Range	−40°C to +85°C
Junction Temperature	150°C
24-Lead SOIC, Power Dissipation	450 mW
θJA Thermal Impedance	250°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec)	215°C
Infrared (15 sec)	220°C

Electrical Characteristics

（VDD = 5 V ± 5%, AGND = DGND = 0 V, on-chip reference, CLKIN = 10 MHz, TMIN to TMAX = –40°C to +85°C, unless otherwise noted.）

Parameter	Value	Unit	Conditions
ACCURACY
Measurement Error on Current Channel	0.1	%Reading typ	Voltage channel with full-scale signal (±500 mV), 25°C, over a dynamic range of 500 to 1
Phase Error Between Channels PF = 0.8Capacitive	±0.1	Degrees	Line frequency 50~60Hz
Phase Error Between Channels PF = 0.5Inductive	±0.1	Degrees	Line frequency 50~60Hz
AC Power Supply Rejection Output Frequency Variation(CF)	0.2	%Reading typ	SCF=0,S1=S0=1， IA=IB=IC=100mVrms，50Hz VA=VB=VC=100mVrms，50Hz ripple on VDD of 175 mV rms，100Hz
DC Power Supply Rejection Output Frequency Variation(CF)	±0.3	%Reading typ	S1=1，S0=SCF=0 IA=IB=IC=100mV rms，50Hz VA=VB=VC=100mVrms，50Hz VDD =5V±250mV
ANALOG INPUTS
Maximum Signal Levels	±0.5	Vmax	VA,VB,VC,IA,IB,IC to GND
Input Impedance (DC)	390	kΩ min	CLKOSC=10MHz
Bandwidth(-3dB)	14	kHz typ	CLKOSC/256，CLKOSC=10MHz
ADC Offset Error	±16	mV max
Gain Error	±9	%Ideal typ	External 2.5V reference IAP=IBP=ICP=500mV ，dc
ON-CHIP REFERENCE
Reference Error	±200	mV max	Nominal 2.5V
Temperature Coefficient	30	ppm/℃ typ	Nominal 2.5V
CLKIN
Input Clock Frequency	12	MHz max	All specifications for CLKIN of 10 MHz
Input Clock Frequency	8	MHz min	All specifications for CLKIN of 10 MHz
LOGIC INPUTS SCF, S0, S1 and ABS
Input High Voltage, V_INH	2.4	V min	VDD=5V±5%
Input Low Voltage, V_INL	0.8	V max	VDD=5V±5%
Input Current, I_IN	±3	μA max	Typically 10nA,VIN=0V to VDD
Input Capacitance, C_IN	10	pF max
LOGIC OUTPUT F1 and F2
Output High Voltage, V_OH	4.5	V min	I_SOURCE=10mA，VDD=5V
Output Low Voltage, V_OL	0.5	V max	I_SINK=10mA，VDD=5V
CF and REVP
Output High Voltage, V_OH	4	V min	I_SOURCE=10mA，VDD=5V
Output Low Voltage, V_OL	0.5	V max	I_SINK=10mA，VDD=5V
POWER SUPPLY For specified performance
VDD	4.75	V min	5V-5%
VDD	5.25	V max	5V+5%
IDD	8	mA max
IDD	5	mA min	Typically 6.5mA

Order Information

Product model	package	manner of packing	Minimum packing quantity
SSP1852	SOP24	Tube	30PCS

SSP1852

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