INDUSTRY COMPONENT

Communication Interface Pins

Electrical contact points enabling data exchange between Real-Time Clock modules and host systems via serial protocols.

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Component Specifications

Definition
Communication interface pins are metallic terminals on Real-Time Clock (RTC) integrated circuits that establish electrical connections for serial data transmission. These pins implement standardized protocols like I²C (Inter-Integrated Circuit) or SPI (Serial Peripheral Interface) to synchronize timekeeping data between the RTC and microcontroller units. They typically include dedicated lines for clock signals, data transmission, power supply, and ground connections, with specific voltage levels and timing requirements.
Working Principle
Communication interface pins operate by converting digital timekeeping data into electrical signals transmitted through serial protocols. For I²C interfaces, SDA (Serial Data Line) and SCL (Serial Clock Line) pins use open-drain configurations with pull-up resistors to enable bidirectional communication. SPI interfaces utilize MOSI (Master Out Slave In), MISO (Master In Slave Out), SCLK (Serial Clock), and CS (Chip Select) pins for full-duplex synchronous data transfer. The pins maintain precise voltage levels (typically 1.8V, 3.3V, or 5V) and follow protocol-specific timing diagrams to ensure reliable data exchange.
Materials
Gold-plated phosphor bronze or beryllium copper alloy with nickel underplating; PCB substrate: FR-4 glass epoxy; Solder: SAC305 (96.5% Sn, 3% Ag, 0.5% Cu); Contact resistance: <20mΩ; Plating thickness: 0.5-1.27μm gold over 2.5μm nickel.
Technical Parameters
  • Data Rate I²C: 100kHz/400kHz/1MHz, SPI: up to 10MHz
  • Pin Count 4-8 pins
  • Contact Pitch 2.54mm or 1.27mm
  • Voltage Range 1.8V to 5.5V
  • Current Rating 10mA per pin
  • Insulation Resistance >100MΩ
  • Operating Temperature -40°C to +85°C
  • Dielectric Withstanding Voltage 500V AC
Standards
ISO 9001, IEC 61188-5-2, JESD22-B111

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Communication Interface Pins.

RTC interface pins I²C communication pins SPI clock pins real-time clock connectors electronic component terminals serial data pins Communication Interface Pins Communication Interface Pins in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Real-Time Clock (RTC)

An electronic component that keeps track of the current time and date independently of the main system power.

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Engineering Analysis

Risks & Mitigation
  • Signal integrity degradation due to long trace lengths
  • Electrostatic discharge damage during handling
  • Incorrect voltage matching causing communication failures
  • Solder joint fatigue from thermal cycling
FMEA Triads
Trigger: Poor solder joint formation during assembly
Failure: Intermittent communication errors or complete signal loss
Mitigation: Implement automated optical inspection (AOI) with X-ray verification for BGA packages, use nitrogen-inerted reflow soldering, and follow IPC-A-610 standards for acceptable criteria.
Trigger: Electromagnetic interference from nearby power components
Failure: Data corruption during timekeeping synchronization
Mitigation: Implement proper PCB layout with ground planes separating communication traces, use twisted-pair routing for differential signals, and add ferrite beads on power lines near interface pins.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Pin position tolerance: ±0.1mm; Contact resistance variation: ±10%; Voltage level tolerance: ±5% of nominal value
Test Method
Continuity testing with 4-wire Kelvin measurement; High-potential testing at 500V AC for 60 seconds; Protocol compliance verification using logic analyzers; Environmental testing per JESD22-A104 (temperature cycling)

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between I²C and SPI interface pins on RTC modules?

I²C interface uses two pins (SDA and SCL) for bidirectional communication with multiple devices on the same bus, while SPI requires four pins (MOSI, MISO, SCLK, CS) for faster full-duplex communication with dedicated chip select lines for each device.

Can RTC communication pins operate at different voltage levels?

Yes, many modern RTC chips support multiple voltage levels (1.8V, 3.3V, 5V) through dual-voltage tolerant pins or level-shifting circuitry, but voltage compatibility must be verified with the host system.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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