NXP Semiconductors MKM34Z128ACLL5R

Overview

MKM34Z128ACLL5R from NXP Semiconductors (formerly Freescale) is a 50 MHz ARM Cortex-M0+ microcontroller optimized for smart metering and low-power industrial sensing applications. It integrates 128 KB flash, 16 KB RAM, dual 24-bit Sigma-Delta AFEs with PGA (gain up to 32), 16-bit SAR ADC, segment LCD controller (up to 40×4), and supports -40°C to +85°C operation at 1.71–3.6 V supply.

For engineers reviewing the MKM34Z128ACLL5R datasheet, MKM34Z128ACLL5R pinout, MKM34Z128ACLL5R application, or MKM34Z128ACLL5R equivalent, key selection criteria include AFE resolution and gain flexibility, ultra-low-power stop modes (as low as 0.35 µA in VLLS0), RTC battery backup support, and dual SPI/I²C/UART interfaces with ISO7816 and IrDA capability.

Technical Context

The MKM34Z128ACLL5R implements a dual-ADC architecture: one 16-bit SAR ADC for general-purpose sampling and two independent 24-bit Sigma-Delta AFE channels-each with programmable gain amplifier (PGA), internal 6-bit DAC reference, and analog comparator. Its clock system includes 1–32 MHz crystal oscillator, 32 kHz RTC crystal input, and multi-purpose clock generator supporting dynamic frequency scaling across power modes.

System-level design leverages four low-power modes (VLPR/VLPS/VLLS0–VLLS3), memory protection unit (MPU), 4-channel DMA with 64 request sources, and Peripheral Crossbar for flexible signal routing. Security features include hardware CRC, TRNG, and 128-bit unique chip ID-enabling secure firmware updates and device authentication in utility-grade metering systems.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (14 mm × 14 mm, PP = LL per part number coding). Pinout validated per KM Family Data Sheet Rev. 1 (Section 8.3, "KM Family Pinouts") and Freescale's KM34Z128ACLH5/ACLL5 pin assignment tables.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar metrology microcontroller applications.

Compared with MKM33Z128ACLL5, MKM34Z128ACLL5 provides an additional 24-bit SD-ADC channel for true dual-path metrology-critical for polyphase error compensation. Against MKE15Z128VLL5, it trades CAN FD and extended temperature for integrated AFE and lower active/standby power, making it superior for battery-backed utility metering.

Availability

MKM34Z128ACLL5R is available at Aetrix Electronics and suitable for smart metering, industrial sensor nodes, and battery-powered display terminals requiring stable component supply and long-term lifecycle assurance.

Supply support for MKM34Z128ACLL5R includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT markets, with deep heritage in microcontrollers and analog/mixed-signal design.

The KM family-including MKM34Z128ACLL5R-is engineered specifically for utility metering and precision sensing, integrating metrology-grade AFEs, ultra-low-power modes, and secure boot capabilities into a single ARM Cortex-M0+ SoC.

FAQ

What is the maximum operating frequency of the MKM34Z128ACLL5R core?

The MKM34Z128ACLL5R features an ARM Cortex-M0+ core rated for up to 50 MHz operation. This frequency is supported across the full –40°C to +85°C ambient temperature range and 1.71–3.6 V supply voltage (when AFE is inactive) or 2.7–3.6 V (when AFE is active), as specified in the KM Family Data Sheet Rev. 1 Section 5.3.1.

Does the MKM34Z128ACLL5R support both shunt and current transformer (CT) based current sensing?

Yes, the MKM34Z128ACLL5R supports both shunt- and CT-based current sensing through its dual 24-bit Sigma-Delta AFE channels, each equipped with a programmable gain amplifier (PGA) offering gains from 1× to 32×. This flexibility allows direct interface to low-voltage shunt resistors or high-output CT secondaries without external amplification-verified in the AFE electrical specifications (Section 6.4.4) of the KM Family Data Sheet.

What is the lowest achievable current consumption in stop mode for the MKM34Z128ACLL5R?

The MKM34Z128ACLL5R achieves 0.35 µA typical current consumption in Very Low-Leakage Stop Mode 0 (VLLS0) with POR detect circuit disabled, measured at 3.0 V and 25°C (Table 6, KM Family Data Sheet Rev. 1). With POR enabled, it draws 0.472 µA-both values validated across –40°C to +105°C per thermal testing conditions.

Can the MKM34Z128ACLL5R drive a 40-segment × 4-backplane LCD directly?

Yes, the MKM34Z128ACLL5R includes an integrated segment LCD controller capable of driving up to 40 frontplane × 4 backplane segments (160 total segments), as confirmed in Section 6.7.1 (LCD electrical characteristics) and feature summary. No external LCD driver IC is required, reducing system cost and board space in utility meter displays.

Is hardware cryptographic acceleration included in the MKM34Z128ACLL5R?

The MKM34Z128ACLL5R does not include dedicated cryptographic accelerators (e.g., AES engines), but it integrates a hardware CRC module for fast cyclic redundancy checks and a true random number generator (TRNG) for secure key generation. These modules-alongside the 128-bit unique chip ID-support foundational security functions required for DLMS/COSEM-compliant firmware signing and anti-cloning, as documented in Section 6.5.2 of the KM Family Data Sheet.