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ATM90E26-YU-R

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Microchip Tech Energy Metering, SSOP-28-208mil. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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ATM90E26-YU-R

Microchip Tech · Energy Metering · SSOP-28-208mil

ATM90E26-YU-R from Microchip Tech, in a SSOP-28-208mil. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 MMD1 input Metering mode configuration bit 1; used with MMD0 to select anti-tampering mode (00), L line mode (01), L+N mode (10), or flexible mode (11).
2 DGND power_in Digital ground reference for digital circuitry.
3 DVDD power_in Digital power supply 2.8V to 3.6V; metering accuracy guaranteed within 3.0V to 3.6V; decouple with 10μF electrolytic and 0.1μF capacitor.
4 Reset input Active-low hardware reset input; apply minimum 200μs pulse width and connect 0.1μF filter capacitor to ground.
5 AVDD power_in Analog power supply 2.8V to 3.6V; metering accuracy guaranteed within 3.0V to 3.6V; decouple with 0.1μF capacitor.
6 AGND power_in Analog ground reference for analog circuitry.
7 I2P input N line current positive input for differential measurement; input range 120μVrms to 600mVrms when N line gain is 1.
8 I2N input N line current negative input for differential measurement; input range 120μVrms to 600mVrms when N line gain is 1.
9 Resv_Low input Reserved input pin; connect to ground for normal operation.
10 I1P input L line current positive input for differential measurement; input range 5μVrms to 25mVrms when L line gain is 24.
11 I1N input L line current negative input for differential measurement; input range 5μVrms to 25mVrms when L line gain is 24.
12 USEL input UART/SPI interface selection; high selects UART interface, low selects SPI interface; must not change after reset.
13 Vref power_in Reference voltage output at 1.26V nominal; decouple with 1μF and 1nF capacitors in parallel to ground.
14 AGND power_in Analog ground reference for analog circuitry.
15 VN input Voltage measurement negative input for differential measurement; input range 120μVrms to 600mVrms.
16 VP input Voltage measurement positive input for differential measurement; input range 120μVrms to 600mVrms.
17 WarnOut output Fatal error warning output; asserted low when metering parameter calibration error or voltage sag is detected.
18 CF1 output Active energy pulse output; generates pulses proportional to active energy with width 80ms (if period ≥160ms) or 0.5T (if period <160ms).
19 CF2 output Reactive energy pulse output; generates pulses proportional to reactive energy with width 80ms (if period ≥160ms) or 0.5T (if period <160ms).
20 IRQ output Interrupt output; asserted low when one or more events in the SysStatus register (01H) occur.
21 ZX output Voltage zero-crossing detection output; asserts 5ms high pulse when voltage signal crosses zero.
22 OSCI input External crystal oscillator input for 8.192MHz crystal; connect 12pF capacitor from pin to ground.
23 OSCO output External crystal oscillator output for 8.192MHz crystal; connect 12pF capacitor from pin to ground.
24 CS input Chip select (active low) for SPI interface; must be driven low for entire read/write operation in 4-wire mode or low all the time in 3-wire mode.
25 SCLK input Serial clock for SPI interface; data on SDI shifted into chip on rising edge, data on SDO shifted out on falling edge.
26 SDO/UTX tri_state Serial data output for SPI (output data on falling edge of SCLK) or UART transmit data; open-drain output requiring 10kΩ pull-up resistor to VDD.
27 SDI/URX input Serial data input for SPI (input address and data on rising edge of SCLK) or UART receive data; 5V compatible input.
28 MMD0 input Metering mode configuration bit 0; used with MMD1 to select anti-tampering mode (00), L line mode (01), L+N mode (10), or flexible mode (11).

Key specifications

Parameter Value
Manufacturer Microchip Tech
Package SSOP-28-208mil
Category Data Acquisition
Pins 28

CAD (KiCad official)

  • Symbol: ATM90E26-YU-R
  • Footprint: Package_SO:SSOP-28_5.3x10.2mm_P0.65mm
  • 3D model: SSOP-28-208mil (KiCad packages3D, STEP)
  • 3D model files: atm90e26-yu-r-etched.step / atm90e26-yu-r-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atm90e26-yu-r.step / atm90e26-yu-r.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Microchip Tech datasheet (60 pp, sha256 2f88e1a16337c82a, retrieved 2026-09-22, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.2, primary claude-haiku-4-5-20251001 (text), consensus claude-sonnet-4-6 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF