SSP1855

Short Description:

The SSP1855 is a high accuracy electrical energy measurement integrated circuit with technical specifications that meet the accuracy requirements specified in IEC1036. The SSP1855 uses analogue circuitry only for the ADC and reference source, and digital circuitry for all other signal processing (such as multiplication and filtering), which allows the SSP1855 to maintain extremely high accuracy and long-term stability in harsh environmental conditions.The SSP1855 pins F1 and F2 output the average value of active power at a lower frequency and can be used to directly drive electromechanical meters or to interface with microcontrollers (MCUs). Pin CF outputs an instantaneous value of active power at a higher frequency for calibration or interfacing with an MCU.The SSP1855 contains an internal monitoring circuit for the VDD power supply pin. The SSP1855 remains in reset until VDD rises to 4V. When VDD falls below 4V, the SSP1855 is also reset, at which point there are no outputs from F1, F2, or CF.Internal phase matching circuitry allows the voltage and current channels to always be phase matched, regardless of whether the high pass filter (HPF) within channel 1 is on or off. An internal no-load threshold feature ensures that the SSP1855 has no latency at no load.The SSP1855 is available in a 24-pin SSOP package.

Tags: Energy measurement chip, Power Metering Chip, Power Metering Circuit Solutions

Product Detail

Features

High accuracy, supporting the accuracy requirements of the 50Hz/60Hz IEC 687/1036 standard, with an error of less than 0.1% over a 500:1 dynamic range;
The active power average is output in frequency from SSP1855 pins F1 and F2;
The active power instantaneous value is output from pin CF at a higher frequency and can be used for meter calibration;
The logic output pin REVP can indicate negative power or miswiring;
FI and F2 can directly drive electromechanical counters and two-phase stepper motors;
The Programmable Gain Amplifier (PGA) in the current channel enables the instrument to use small resistance shunt resistors;
The use of specialised analogue-to-digital converters (ADCs) and digital signal processing (DSPs) ensures a high degree of accuracy even under conditions of highly variable environment and time;
Power monitoring circuitry is provided on-chip;
Anti-submarine function (no-load threshold) is included in the chip;
An on-chip reference voltage of 2.5V±8% (temperature coefficient typical 30ppm/℃) provides a reference for external circuits;
A high stability oscillator with little sensitivity to temperature is included on the chip.
+5V single-supply, low-power (15mW 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	V1P,V1N,V2P,V2N 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	3.5	4	mA
Measurement error for channel 1		Channel 2 is full-scale input (±165mV), +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		%
Analogue Inputs
Max Signal Level		V1P,VIN,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		±4		%
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
SSP1855	SSOP24	Tube	60PCS

SSP1855

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Parameter table

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Parameter table

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