CSE7766
Single-phase Multi-function Measuring ChipThe CSE7766 is a single-phase multi-function measuring chip from Chipsea. View the full CSE7766 datasheet below including key specifications, absolute maximum ratings.
Official CSE7766 datasheet (PDF) — the source this page was extracted from.
CSE7766 Key Specifications
| Parameter | Value |
|---|---|
| Pulse Output | CF, 50% duty cycle |
| Input Impedance | 500kΩ (current channel), 6MΩ (voltage channel) |
| Operating Current | 4mA typical (<5mA) |
| Power Consumption | 20mW typical |
| Supply Voltage (VDD) | 4.5V to 5.5V (5.0V typical) |
| Communication Interface | UART, 4800bps (±2%), 8 data bits, even parity, 1 stop bit |
| Cumulative Energy Error | ±1% |
| Storage Temperature Range | -65°C to 150°C |
| Voltage Channel Max Input | ±700mV |
| Internal Voltage Reference | 2.43V typical (2.3V to 2.55V) |
| Power-Fail Reset Threshold | 4V low / 4.3V high |
| Operating Temperature Range | -40°C to 85°C |
| Internal Oscillator Frequency | about 3.579MHz |
| Absolute Maximum Supply Voltage | -0.3V to 6.0V |
| Reference Temperature Coefficient | 25ppm/°C |
| Current Channel Max Differential Input | ±43.75mV |
CSE7766 Overview
Part: CSE7766 — Chipsea
Type: Calibration-free Electric Energy Measuring Chip
Description: Single-phase multifunction electric energy metering IC with built-in 2.43 V reference, high-frequency CF pulse output, and UART interface for reading current, voltage, and power parameters.
Operating Conditions:
- Supply voltage: 4.5–5.5 V
- Operating temperature: -40 to 85 °C
- Master clock frequency: 3.579 MHz (typical)
Absolute Maximum Ratings:
- Max supply voltage: +6.0 V
- Max continuous current:
- Max junction/storage temperature: 150 °C (storage temperature)
Key Specs:
- Power supply current (VDD = 5 V): 4 mA typical
- Power consumption (VDD = 5 V): 20 mW typical
- Reference voltage (VREF): 2.43 V typical (2.3–2.55 V)
- Reference temperature excursion: 25 ppm/°C typical
- Maximum differential input signal (current channel V1P, V1N): ±43.75 mV
- Maximum input signal (voltage channel V2P): ±700 mV
- Input impedance: 500 kΩ (current channel), 6 MΩ (voltage channel)
- Equivalent input noise: 2 μVrms (current channel), 20 μVrms (voltage channel)
- Low voltage reset threshold: 4 V typical
- UART baud rate: 4800 bps (±2%)
Features:
- Factory calibrated with ±1% cumulative charge error
- High-frequency active pulse output (CF) with 50% duty cycle
- Direct readout of RMS current, RMS voltage, and active power via UART
- Built-in power failure monitoring with automatic reset below 4 V
- Integrated 2.43 V on-chip reference voltage source
- Built-in master clock oscillator (3.579 MHz typical)
Applications:
- Single-phase multifunction watt-hour meters
- Smart measuring sockets
- Power and energy data display instruments
Package:
- SOP8
CSE7766 Pin Configuration
CSE7766 is packaged in SOP8.
Figure 1: Chip Pin Diagram
Rev1.2 Page 4 of 25
CSE7766 Absolute Maximum Ratings
| Parameters | Symbol | Min. Value | Typica l Value | Max. Value | Unit |
|---|---|---|---|---|---|
| power supply | VDD | -0.3 | - | +6.0 | V |
| V1P, V1N, V2P | -2 | +2 | V | ||
| Analog input voltage | V INA | -0.3 | - | VDD+0.3 | V |
| Digital input voltage | V IND | -0.3 | - | VDD+0.3 | V |
| Digital output voltage | V OUTD | -0.3 | - | VDD+0.3 | V |
| Operating ambient temperature | T A | -40 | - | 85 | ° C |
| Storage temperature | T stg | -65 | - | 150 | ° C |
CSE7766 Recommended Operating Conditions
| Parameters | Symbol | Min. Value | Typical Value | Max. Value | Unit |
|---|---|---|---|---|---|
| power range | VDD | 4.5 | 5.0 | 5.5 | V |
| Temperature range | T A | -40 | - | 85 | °C |
CSE7766 Typical Application
As shown in Figure 2, two small capacitors shall be connected in parallel on power supply terminal of CSE7766 to filter out high-frequency and low-frequency noise from power grid. The current signal is connected to CSE7766 after being sampled by manganin resistor and the voltage signal is inputted into CSE7766 after passing through resistor network. CSE7766 must be connected to the current signal and the voltage signal simultaneously but shall not be connected only to either signal.
Figure 2: Typical Application of CSE7766 (Isollation)
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