Infineon Technologies FM3164-G

Overview

FM3164-G from Infineon Technologies (formerly Cypress) is a 64-Kbit integrated processor companion IC combining ferroelectric RAM (F-RAM), real-time clock (RTC), low-VDD supervisor, watchdog timer, dual event counter, and 64-bit lockable serial number in a single 14-pin SOIC package. It delivers NoDelay™ writes, 10¹⁴ endurance cycles, 151-year data retention, and operates from 2.7 V to 5.5 V across –40 °C to +85 °C - deployed in industrial metering, backup-critical embedded controllers, and secure logging systems.

For engineers reviewing the FM3164-G datasheet, FM3164-G pinout, FM3164-G application, or FM3164-G equivalent, key selection considerations include I²C-compatible 1-MHz interface timing, battery-backed RTC/calendar with BCD output and leap-year support through 2099, programmable reset trip point (2.55 V / 2.75 V / 2.95 V / 3.15 V), active-low open-drain RST with 100 ms timeout, and dual edge-triggered event counters with polarity control.

Technical Context

The FM3164-G integrates two logically independent I²C devices on one die: an 8K × 8 F-RAM array (slave address 0x50–0x53) and a companion peripheral block (slave address 0x68) housing RTC registers, supervisor controls, event counters, and serial number. All timekeeping and counter functions remain active under VBAK backup power while VDD is absent or below operational threshold.

Its supervisor uses a programmable voltage monitor (VTP[1:0] bits in register 0xB) to assert RST when VDD drops below one of four factory-set thresholds; the watchdog timer (100 ms–3 s range) resets the host if not serviced, and the PFI comparator compares external voltage to an internal 1.2 V reference for early power-fail NMI generation.

Key Specifications

Pinout & Package

FM3164-G is housed in a 14-pin Small Outline Integrated Circuit (SOIC) package with standard 1.27 mm pitch, RoHS-compliant, and rated for industrial temperature operation (–40 °C to +85 °C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar integrated processor companion applications.

Compared with MAX31343, FM3164-G adds dual event counters and lockable serial number at higher memory density and larger package; versus discrete ADT7420+FM24V01, it reduces BOM count, layout complexity, and firmware integration effort while guaranteeing synchronized time/data coherency.

Availability

FM3164-G is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, secure access terminals, and medical diagnostics requiring stable component supply, long-term data integrity, and battery-backed timekeeping.

Supply support for FM3164-G 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

Infineon Technologies is a global semiconductor leader headquartered in Munich, Germany, delivering power systems, microcontrollers, sensors, and security solutions for automotive, industrial, and IoT applications.

The FM3164-G belongs to Infineon's legacy Cypress processor companion family, designed specifically to consolidate nonvolatile memory, RTC, and supervisory functions into a single I²C-accessible device for resource-constrained embedded systems.

FAQ

What is the maximum I²C clock frequency supported by FM3164-G?

The FM3164-G supports I²C operation up to 1 MHz, with full backward compatibility for standard-mode (100 kHz) and fast-mode (400 kHz) timing. The SCL input includes a Schmitt trigger for noise immunity, and the SDA driver incorporates slope control to meet rise/fall time requirements across varying bus capacitance.

How does the FM3164-G handle power transitions between VDD and VBAK?

When VDD drops below ~3.6 V, the internal power switch automatically transfers RTC, event counters, and serial number registers to VBAK. The transition is seamless and retains all state; no data loss occurs. If VBAK is unconnected, VBAK must be tied to VDD (for VDD ≤ 3.6 V) or left floating with VBC bit set (for VDD > 3.6 V).

Can the event counters operate without VDD present?

Yes - CNT1 and CNT2 are battery-backed inputs. As long as VBAK ≥ 1.5 V, both counters continue incrementing on detected edges (rising or falling, per configuration) and retain their values across complete VDD loss. Their registers remain readable via I²C even during VDD absence, provided VBAK is active.

Is the 64-bit serial number truly one-time programmable and irreversible?

Yes - the 64-bit serial number area can be written once, then permanently locked using the SNL bit in register 0xB. Once locked, no further writes to the serial number registers are possible, even with full I²C access. This hardware-enforced lock provides cryptographic binding between device identity and firmware, meeting secure boot and anti-cloning requirements.