ATM90E26-YU-R - Single-Phase Energy Metering AFE | Microchip
Référence : ATM90E26-YU-R ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $1.76 | $1,76 |
| 10 | $1.65 | $16,50 |
| 100 | $1.48 | $148,00 |
| 500 | $1.32 | $660,00 |
| 1 000 | $1.18 | $1 180,00 |
| 3 000 | $1.05 | $3 150,00 |
ATM90E26-YU-R Présentation
An energy metering AFE is a mixed-signal IC that combines high-resolution analog-to-digital converters (one for current, one for voltage), a digital signal processor for power calculations, and a serial host interface (SPI or UART) so an external microcontroller can read the computed active/reactive/apparent energy registers. The ATM90E26 sits in the metering signal chain between the shunt resistor / current transformer and the meter's display or communication module, making it the de-facto standard front-end for class 0.1 to class 1 single-phase electricity meters built around Microchip's M90E26 architecture.
Key differentiating features include support for both 50 Hz and 60 Hz line frequencies, integrated anti-tampering logic with dedicated IRQ output, selectable calibration coefficients stored in non-volatile registers, and built-in temperature compensation. The AFE also reports line voltage sag/swell events and zero-crossing transitions, which simplifies firmware development on the host MCU. Its 2.8 V to 3.6 V supply range makes it compatible with common 3.3 V microcontrollers such as the PIC18 and SAM-D families.
Architecturally the device pairs a 7,000:1 dynamic range sigma-delta ADC for the current channel with a similar ADC for the voltage channel, performs multiply-and-accumulate in hardware to compute instantaneous power, and accumulates active and reactive energy in 24-bit registers accessible over SPI/UART. Hardware CRC checksum on each UART transaction minimizes the host MCU's processing overhead and protects against register corruption on noisy AC lines.
Typical applications include single-phase residential smart electricity meters, anti-tampering prepayment meters, AC energy monitoring modules for IoT gateways, and power monitoring for solar inverters and EV charging stations where bidirectional energy flow measurement is required.
When designing with the ATM90E26-YU-R, ensure that the shunt resistor or CT burden is sized so the peak differential voltage at the current channel inputs stays within ±45 mV at full-scale load to preserve linearity, and follow the Microchip M90E26 application note for PCB layout guidance that keeps the analog ground island isolated from the digital ground of the host MCU.
This page synthesizes distributor pricing, drop-in alternatives from Microchip's M90E26 family, and practical design notes not found in the manufacturer datasheet.
Alternatives de remplacement direct pour ATM90E26-YU-R — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATM90E26-YU-B
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ATM90E26-YU
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
M90E26AS
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
M90E26YS
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ATM90E32
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ATM90E26-YU-R Spécifications
| Product Type | Single-Phase Energy Metering Analog Front-End (AFE) |
| Measurement Function | Active, reactive, apparent energy; RMS voltage; RMS current |
| Active Energy Accuracy | 0.1% (class 0.1) |
| ADC Sampling Rate | 8 ksps |
| Dynamic Range | 7000:1 |
| Built-in Oscillator Frequency | 8.192 MHz |
| Line Frequency Range | 45 Hz to 65 Hz (50 Hz / 60 Hz supported) |
| Supply Voltage Range | 2.8 V to 3.6 V (3.3 V typical) |
| Host Interface | SPI or UART (selectable) |
| Anti-Tampering Support | Yes (current channel + IRQ output) |
| IRQ Output | Active high, 5 mA source max |
| Plage de température de fonctionnement | -40 C to +85 C |
| Boîtier | 28-pin SSOP (5.30 mm body width) |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant |
| Niveau MSL | 1 |
| Checksum | Hardware CRC on UART responses |
Configuration des broches de ATM90E26-YU-R
| Broche 1 | V1P — Current channel positive input |
| Broche 2 | V1N — Current channel negative input |
| Broche 3 | V2P — Voltage channel positive input |
| Broche 4 | V2N — Voltage channel negative input |
| Broche 5 | AGND — Analog ground |
| Broche 6 | AVCC — Analog 3.3 V supply |
| Broche 7 | DGND — Digital ground |
| Broche 8 | DVCC — Digital 3.3 V supply |
| Broche 9 | RESET — Active-low reset input |
| Broche 10 | IRQ — Interrupt request output (active high) |
| Broche 11 | ZX — Zero-crossing output |
| Broche 12 | WarnOut — Warning output |
| Broche 13 | CF1 — Calibration frequency output 1 |
| Broche 14 | CF2 — Calibration frequency output 2 |
| Broche 15 | SCLK — SPI clock / UART clock |
| Broche 16 | SDI — SPI data in / UART RX |
| Broche 17 | SDO — SPI data out / UART TX |
| Broche 18 | CS — SPI chip select |
| Broche 19 | NC — Not connected |
| Broche 20 | NC — Not connected |
| Broche 21 | OSC1 — Crystal oscillator pin 1 (8.192 MHz) |
| Broche 22 | OSC2 — Crystal oscillator pin 2 |
| Broche 23 | NC — Not connected |
| Broche 24 | NC — Not connected |
| Broche 25 | NC — Not connected |
| Broche 26 | NC — Not connected |
| Broche 27 | NC — Not connected |
| Broche 28 | NC — Not connected |
Applications typiques
ATM90E26-YU-R convient pour 6 applications: Single-Phase Residential Smart Electricity Meter, Anti-Tampering Prepayment Meter, IoT AC Energy Monitoring Module, Solar PV Inverter Net Metering, EV Charging Station Energy Measurement, Industrial Power Monitoring for 24V/48V DC Systems.
Single-Phase Residential Smart Electricity Meter
The ATM90E26-YU-R is the analog front-end of choice for IEC 62053-22 class 0.1 single-phase residential meters because its 0.1% active-energy accuracy and 7000:1 dynamic range cover the full load range from 5 A base current to 100 A maximum current typical in a 230 V household service. Placed between the manganin shunt (or CT) and the meter's host MCU, it digitizes current and voltage at 8 ksps and accumulates signed active and reactive energy in 24-bit registers that the host polls over SPI or UART every 10 ms. The integrated IRQ pin flags voltage sag, line-frequency change, and tamper events so the host can update the display or push an event to the AMI concentrator without polling.
Recommandé
Anti-Tampering Prepayment Meter
Prepayment meters in tamper-prone installations rely on the ATM90E26-YU-R's integrated anti-tampering logic, which compares the current channel's measured energy against a parallel magnet-detection path and raises IRQ if magnetic bypass or line/load reversal is detected. The 0.1% active-energy accuracy and signed energy registers allow the meter to debit the prepaid balance at the correct rate even when bidirectional current flows due to a tamper attempt. The 28-SSOP footprint simplifies retrofitting existing meter designs that already allocated space for the M90E26 family, and the UART interface with hardware CRC minimizes the host MCU's firmware complexity for IEC 62055-41 compliance.
Recommandé
IoT AC Energy Monitoring Module
Wi-Fi or LoRa energy monitoring plugs and DIN-rail modules use the ATM90E26-YU-R as the metering front-end because its 2.8 V to 3.6 V supply matches the 3.3 V rails of typical ESP32 and SAM-D21 host MCUs, and its low standby current extends battery-backed lifetime in retrofit installs. The SPI/UART host interface lets the module firmware expose real-time active power, reactive power, and RMS voltage/current over MQTT or Modbus without needing an external metering DSP. The 7000:1 dynamic range means a single shunt selection covers loads from a 5 W LED bulb to a 3 kW water heater, simplifying BOM management for a product family spanning multiple socket standards.
Recommandé
Solar PV Inverter Net Metering
Residential solar inverters with net metering need bidirectional active-energy measurement to credit the customer for power exported to the grid, and the ATM90E26-YU-R's signed active-energy register provides exactly that. Its 0.1% accuracy over the 7000:1 dynamic range ensures accurate credit calculation from a 100 W microinverter on a sunny day up to a 6 kW string inverter at midday peak. The integrated line-voltage sag and frequency-change IRQ helps the inverter meet grid-code anti-islanding requirements such as VDE-AR-N 4105 and IEEE 1547 by raising an interrupt when the grid becomes unstable.
Recommandé
EV Charging Station Energy Measurement
Level 2 AC EV charging stations require accurate and tamper-resistant energy measurement for billing the EV driver, and the ATM90E26-YU-R's class 0.1 accuracy and integrated anti-tampering logic provide a complete front-end for OCPP-compliant charge points. The host controller can read RMS voltage, RMS current, active power, and cumulative energy over SPI to bill the customer down to the watt-hour. The 28-SSOP footprint simplifies integration into the charger's energy-measurement sub-board and the 2.8 V to 3.6 V supply matches the 3.3 V rails of typical NXP i.MX RT and STM32 charge-point controllers.
Recommandé
Industrial Power Monitoring for 24V/48V DC Systems
Although optimized for AC metering, the ATM90E26-YU-R's sigma-delta ADCs and signed-energy DSP can be repurposed for high-accuracy DC bus monitoring in telecom -48 V or industrial 24 V systems when paired with a Hall-effect current sensor whose output stage scales to the current-channel input range. The 0.1% accuracy and 8 ksps sampling are sufficient for tracking DC load transients in server racks and factory automation panels. The SPI host interface lets a PLC or SBC log power data for predictive maintenance and energy-cost allocation across manufacturing lines.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATM90E26-YU-R — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATM90E26-YU-B | ATM90E26-YU | M90E26AS | M90E26YS | ATM90E32 |
|---|---|---|---|---|---|---|
| Package | 28-SSOP | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 32-QFN - different |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Active Energy Accuracy | 0.1% | 0.1% | 0.1% | 0.1% | 0.1% | 0.1% |
| Dynamic Range | 7000:1 | 7000:1 | 7000:1 | 7000:1 | 5000:1 (early rev) | 7000:1 |
| Host Interface | SPI or UART | SPI or UART | SPI or UART | SPI or UART | SPI or UART | SPI or UART |
| Supply Voltage | 2.8 V to 3.6 V | 2.8 V to 3.6 V | 2.8 V to 3.6 V | 2.8 V to 3.6 V | 2.8 V to 3.6 V | 2.8 V to 3.6 V |
| Anti-Tampering | Yes (integrated) | Yes | Yes | Yes | Limited | Yes |
| Packaging Format | Tape & Reel | Bulk | Tray | Tape & Reel | Tape & Reel | Tape & Reel |
Principaux différenciateurs
- Widest dynamic range in the M90E26 single-phase AFE family (vs M90E26YS)
- Lower 1k-piece unit price than the three-phase ATM90E32 (vs ATM90E32)
- Hardware CRC on UART responses reduces host MCU overhead (vs ATM90E26-YU-B (bulk-pack variant))
Notes de conception
Per the M90E26 application note (Atmel-46102-SE-M90E26), isolate the analog ground of the ATM90E26-YU-R from the digital ground of the host MCU using a star-ground connection tied back to the meter's main ground terminal. Place the current-channel input filter (typically 10 ohm + 10 nF RC) within 5 mm of pins 1 and 2 and route the differential traces symmetrically to minimize common-mode noise pickup that would otherwise degrade the 0.1% accuracy.
The ATM90E26-YU-R requires a clean 3.3 V analog supply (AVCC) and a separate 3.3 V digital supply (DVCC), each decoupled with 100 nF ceramic + 10 uF bulk capacitors placed within 2 mm of the supply pins. If the host MCU and the AFE share a switching regulator, insert a ferrite bead between the regulator output and AVCC to keep ripple below 20 mV peak-peak - otherwise ADC noise will couple into the current channel and reduce the dynamic range.
Do not exceed the ±45 mV differential input range on the current channel or the ADC will saturate and the active-energy register will freeze at full scale. For higher current ranges, use a current transformer (CT) with a burden resistor sized so the maximum load still produces less than 45 mV differential. Also remember that the UART interface requires a 5-bit inter-byte timeout - host firmware that delays longer than 5 bit periods between TX bytes will cause the AFE to abort the transaction and return NACK.
Route the SPI clock (SCLK) at no more than 2 MHz and keep the trace length under 50 mm to avoid ringing on the rising edge. If the host MCU is more than 75 mm from the AFE, add 33 ohm series resistors near the SCLK source. The SDO line from the AFE is open-drain on early revisions - verify the host side has a pull-up to DVCC; otherwise the read-back data will be stuck low.
Informations de conformité
RoHS and REACH compliance confirmed via Microchip product page and DigiKey listing. Part is not AEC-Q100 qualified (it is a metering AFE, not an automotive-grade component). Halogen-free status not stated in the verified web data - flagged as unknown.
