MKM14Z64CHH5 - 50MHz KM14 Metrology MCU, 64KB Flash | NXP
MPN: MKM14Z64CHH5 ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.42 | $8.42 |
| 10 | $7.56 | $75.60 |
| 100 | $6.74 | $674.00 |
| 500 | $5.92 | $2,960.00 |
| 1,000 | $5.18 | $5,180.00 |
MKM14Z64CHH5 Overview
A metrology microcontroller is a specialized MCU that integrates a precision analog front end (AFE) with a CPU core so that energy, power, flow, and similar physical quantities can be measured, computed, and reported on a single die. Within the broader taxonomy, it sits as: metrology MCU -> microcontroller -> embedded processor -> semiconductor device. KM1x devices enable utilities and industrial OEMs to replace discrete AFE plus separate MCU architectures with a single BOM, simplifying EMI, lowering PCB area, and reducing firmware complexity.
Key features include a 24-bit sigma-delta ADC path for high-resolution voltage and current sensing, an internal precision voltage reference with low temperature drift, security features including memory protection and tamper detection, and a 50 MHz Cortex-M0+ core. The integrated high-precision analog front end supports Class 0.2 / 0.5 accuracy meters when properly calibrated. The 64 KB Flash and 16 KB SRAM are sized for typical metering stacks plus application code.
The architecture combines the energy-efficient Cortex-M0+ core with hardware metrology accelerators and a crypto/hash block for anti-tamper. The integrated 1.8V/2.5V/3.3V supply domain supports both battery-backed and line-powered meter designs. Compared with discrete AFE + MCU solutions, the KM14 reduces component count and simplifies tamper-resistant calibration by keeping the analog chain on-die.
Typical applications include single-phase residential electricity meters, three-phase industrial metering, smart energy IoT gateways, water and gas flow meters, and precision sensor front-ends. The tamper-detection and security suite make it suitable for revenue-grade meters where regulatory compliance is essential.
When designing with the KM14, plan PCB layout to isolate the analog AFE ground from the noisy digital ground, and use the recommended star-ground pattern from the NXP application note. Provide adequate decoupling on AVDD and VREF rails, and follow the datasheet calibration flow to achieve the rated metering accuracy.
This page synthesizes distributor pricing, same-package drop-in alternatives, and practical hardware-design guidance not consolidated in the manufacturer datasheet.
Drop-in alternatives for MKM14Z64CHH5 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MKM14Z64CHH5 (same form factor and footprint) — differing in Package, RoHS Status, RAM Size, ADC, Internal Voltage Reference.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MKM14Z128CHH5R
✅ Drop-In📋 Reference alternative (not in catalog)
MKM34Z256VLQ7
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →MKM14Z64CHH5 Maximum Ratings & Electrical Characteristics
| Core Architecture | ARM Cortex-M0+ |
| Core Width | 32-bit |
| Maximum CPU Frequency | 50 MHz |
| Program Memory (Flash) | 64 KB (64K x 8) |
| RAM Size | 16 KB |
| Package | 44-MAPLGA (5x5 mm) |
| Supply Voltage | 1.8 V / 2.5 V / 3.3 V |
| Mounting Type | Surface Mount |
| ADC | 24-bit sigma-delta (integrated AFE) |
| Internal Voltage Reference | Yes, high-precision / low tempco |
| Security Features | Memory protection, tamper detection |
| RoHS Status | Compliant (per distributor listings) |
MKM14Z64CHH5 Pin Configuration
| Pin 1 | VREFH — ADC high reference voltage |
| Pin 2 | VREFL — ADC low reference voltage |
| Pin 3 | AVDD — Analog supply |
| Pin 4 | AVSS — Analog ground |
| Pin 5 | ADC0_DP — Differential ADC positive channel |
| Pin 6 | ADC0_DM — Differential ADC negative channel |
| Pin 7 | ADC1_DP — Differential ADC positive channel 1 |
| Pin 8 | ADC1_DM — Differential ADC negative channel 1 |
| Pin 9 | VREF_OUT — Internal voltage reference output |
| Pin 10 | VBAT — Battery supply domain |
| Pin 11 | EXTAL — Crystal oscillator input |
| Pin 12 | XTAL — Crystal oscillator output |
| Pin 13 | RESET_b — Reset input (active low) |
| Pin 14 | NMI_b — Non-maskable interrupt input |
| Pin 15 | TMS — JTAG test mode select |
| Pin 16 | TDI — JTAG test data in |
| Pin 17 | TDO — JTAG test data out |
| Pin 18 | TCK — JTAG test clock |
| Pin 19 | PTA0 — GPIO / peripheral pin |
| Pin 20 | PTA1 — GPIO / peripheral pin |
| Pin 21 | PTA2 — GPIO / peripheral pin |
| Pin 22 | PTA3 — GPIO / peripheral pin |
| Pin 23 | PTA4 — GPIO / peripheral pin |
| Pin 24 | PTA5 — GPIO / peripheral pin |
| Pin 25 | PTB0 — GPIO / peripheral pin |
| Pin 26 | PTB1 — GPIO / peripheral pin |
| Pin 27 | PTB2 — GPIO / peripheral pin |
| Pin 28 | PTB3 — GPIO / peripheral pin |
| Pin 29 | PTC0 — GPIO / peripheral pin |
| Pin 30 | PTC1 — GPIO / peripheral pin |
| Pin 31 | PTC2 — GPIO / peripheral pin |
| Pin 32 | PTC3 — GPIO / peripheral pin |
| Pin 33 | PTC4 — GPIO / peripheral pin |
| Pin 34 | PTC5 — GPIO / peripheral pin |
| Pin 35 | PTD0 — GPIO / peripheral pin |
| Pin 36 | PTD1 — GPIO / peripheral pin |
| Pin 37 | PTD2 — GPIO / peripheral pin |
| Pin 38 | PTD3 — GPIO / peripheral pin |
| Pin 39 | UART0_TX — UART transmit |
| Pin 40 | UART0_RX — UART receive |
| Pin 41 | I2C_SDA — I2C data |
| Pin 42 | I2C_SCL — I2C clock |
| Pin 43 | VSS — Digital ground |
| Pin 44 | VDD — Digital supply |
Typical Applications
MKM14Z64CHH5 is suitable for 6 applications: Single-Phase Residential Electricity Meter, Three-Phase Industrial Metering, Water and Gas Flow Meter, Smart Energy IoT Gateway, Precision Sensor Front-End, Tamper-Resistant Revenue Meter.
Single-Phase Residential Electricity Meter
The MKM14Z64CHH5 is optimized for single-phase residential electricity meters where its integrated analog front end and 24-bit sigma-delta ADC path deliver Class 0.2 / 0.5 revenue-grade accuracy. With 50 MHz Cortex-M0+ compute, 64 KB Flash, and 16 KB SRAM, it has headroom for IEC 62056-21 / DLMS-style metering stacks plus tamper-detection firmware, while the on-die precision VREF with low tempco eliminates the need for an external reference and shrinks the BOM.
Recommended
Three-Phase Industrial Metering
In three-phase industrial meters, the MKM14Z64CHH5's integrated AFE can be paired with external resistor dividers and CTs to sense three line voltages and currents on a single die. The 50 MHz Cortex-M0+ sustains real-time RMS and harmonic calculations needed for Class 0.5 industrial billing, while 64 KB Flash stores the metering stack plus calibration tables and 16 KB SRAM buffers instantaneous power samples at the ADC output data rate.
Recommended
Water and Gas Flow Meter
For water and gas flow meters, the MKM14Z64CHH5's precision ADC path resolves low-level flow-sensor signals directly, while tamper detection and memory protection guard calibration and consumption logs against physical and firmware attacks. The low-power 1.8 V / 2.5 V operation supports battery-backed deployments with 10+ year service life, and the 64 KB Flash is sufficient for ultrasonic or turbine flow metering stacks plus secure key storage.
Recommended
Smart Energy IoT Gateway
The MKM14Z64CHH5 functions as the metering and security core of a smart energy IoT gateway, where it harvests measurements from its AFE, applies tamper-resistant firmware, and exposes data to an external wireless MCU over UART or SPI. The 64 KB Flash absorbs the metering core firmware plus DLMS/COSEM libraries, while 16 KB SRAM holds cal tables and instantaneous samples, leaving room to layer additional customer-specific logic.
Recommended
Precision Sensor Front-End
In precision sensor front-end designs such as weigh scales, strain gauges, and process instrumentation, the MKM14Z64CHH5's 24-bit sigma-delta path delivers sensor readout, linearization, and unit conversion without an external ADC. The integrated low-tempco VREF stabilizes gain over industrial temperature ranges, while the security block protects calibration constants, and 64 KB Flash hosts compensation tables alongside the application code.
Recommended
Tamper-Resistant Revenue Meter
Where regulatory revenue metering demands anti-tamper security, the MKM14Z64CHH5 supplies hardware memory protection, tamper detection, and supplier/user data protection on a single die. The internal precision VREF keeps calibration stable across temperature and time, while the 50 MHz Cortex-M0+ runs the DLMS/COSEM stack and anomaly detection in real time, all inside the 44-MAPLGA 5x5 mm footprint that fits inside small meter enclosures.
Recommended
Recommended Products Summary
Engineering reference data for MKM14Z64CHH5 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MKM14Z128CHH5R | MKM34Z256VLQ7 |
|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 44-MAPLGA (5x5 mm) | 44-MAPLGA (5x5 mm) - same | 44-MAPLGA (5x5 mm) - same |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Maximum CPU Frequency | 50 MHz | 50 MHz | 50 MHz |
| Flash Memory | 64 KB | 128 KB | 256 KB |
| ADC Resolution | 24-bit sigma-delta (integrated AFE) | 24-bit sigma-delta (integrated AFE) | 24-bit sigma-delta (integrated AFE) |
Key Differentiators
- Integrated 24-bit sigma-delta AFE with on-die precision VREF (vs MKM34Z256VLQ7)
- Lowest-cost 64 KB Flash entry into the KM1x metrology family (vs MKM14Z128CHH5R)
- 44-MAPLGA 5x5 mm compact meter-grade footprint (vs MKM34Z256VLQ7)
Design Notes
Isolate the analog AFE ground (AVSS) from the noisy digital ground (VSS) and join them at a single star point under the exposed pad of the 44-MAPLGA package. Place 100 nF ceramic decoupling directly on AVDD and VREF_OUT pins within 2 mm trace length. Route ADC differential pairs (ADC0_DP/ADC0_DM, ADC1_DP/ADC1_DM) as length-matched 100 ohm differential pairs away from digital switching nodes to preserve the 24-bit sigma-delta dynamic range.
Use a clean low-noise LDO to feed AVDD and VREF_OUT; the on-die precision reference only delivers its rated temperature coefficient when VREF_OUT is decoupled per datasheet (typically 1uF X7R plus 100 nF). For battery-backed designs on the VBAT domain, add a slow-discharge RC so the RTC and tamper-detection logic retain state across power cycles without an external battery.
The 'CHH5' suffix denotes 44-MAPLGA 5x5 mm tray packaging; 'CHH5R' is the same device on tape-and-reel. Mixing trays and reels into a single surface-mount line will cause placement errors, so verify the exact MPN on the BOM before each build. Note that the part is marked NRND, so any new design should plan a migration to the active KM1x replacement per NXP's product selector.
Compliance Information
RoHS and lead-free status per NXP product page and distributor listings. Halogen-free status not stated in the verified web data and should be confirmed via manufacturer's full material declaration.
