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Diodes Incorporated PT7C4563BQ1WEX
- Part No.:
- PT7C4563BQ1WEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Real Time Clocks
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
PT7C4563BQ1WEX.pdf
- Description:
- IC RTC CLK/CALENDAR I2C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:925
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Product details
Overview
PT7C4563BQ1WEX from Diodes Incorporated is an AEC-Q100 qualified automotive-grade real-time clock (RTC) IC with integrated BCD time/calendar counters, I²C interface (400 kHz), programmable square-wave output (1/32/1.024k/32.768k Hz), and oscillator fail detection. It operates from 1.3 V to 5.5 V across −40°C to +125°C and draws only 400 nA typical backup current at 3.0 V.
For engineers reviewing the PT7C4563BQ1WEX datasheet, PT7C4563BQ1WEX pinout, PT7C4563BQ1WEX application, or PT7C4563BQ1WEX equivalent, key selection considerations include automotive temperature compliance, crystal ESR tolerance up to 100 kΩ, built-in 12 pF load capacitors, alarm interrupt capability, and I²C high-speed mode support.
Technical Context
The PT7C4563BQ1WEX implements a fully autonomous RTC core with BCD-encoded timekeeping (seconds–years), automatic leap-year correction through 2100, and calendar date rollover logic for variable-month lengths. Its oscillator circuit supports external 32.768 kHz crystals with internal 12 pF load capacitance per pin (X1/X2) and detects oscillation failure via the OSF flag.
Communication uses a standard 2-wire I²C interface with open-drain SDA/SCL pins, supporting high-speed mode (400 kHz), burst read/write, and address auto-increment. The SQW pin delivers selectable square-wave frequencies under register control (SQWE + RS1/RS0), while the INT pin provides active-low, open-drain alarm interrupts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.3 V to 5.5 V - Enables direct integration into 1.8 V, 3.3 V, and 5 V automotive subsystems without level-shifting. |
| Backup Current (Typ.) | 400 nA at VCC = 3.0 V, TA = 25°C - Ensures >10-year battery backup with common coin cells in infotainment or ADAS modules. |
| I²C Clock Frequency | Up to 400 kHz - Supports high-speed data exchange with host microcontrollers in time-critical diagnostics or logging applications. |
| Square-Wave Output Frequencies | 1 Hz, 32 Hz, 1.024 kHz, 32.768 kHz - Provides flexible timing references for wake-up triggers, LED blinking, or system synchronization. |
| Crystal ESR Support | Up to 100 kΩ - Accommodates low-cost, high-stability automotive-grade crystals without external biasing components. |
| Operating Temperature | −40°C to +125°C - Qualified for engine bay, transmission control, and ADAS ECU placement per AEC-Q100 Grade 0. |
| Oscillator Fail Detection | OSF flag in Status Register - Enables firmware to detect and recover from crystal faults before time corruption propagates. |
Pinout & Package
PT7C4563BQ1WEX is housed in an 8-pin SOIC (W) package (5.3 mm × 5.3 mm, 1.27 mm pitch), RoHS-compliant and halogen-free, suitable for reflow soldering in automotive PCB assemblies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (X1) | Oscillator Input | Connects to one terminal of external 32.768 kHz crystal; internal 12 pF capacitor to GND reduces external component count. |
| 2 (X2) | Oscillator Output | Connects to other crystal terminal; internal 12 pF capacitor to GND enables stable startup with high-ESR crystals. |
| 3 (INT) | Alarm Interrupt Output | Open-drain, active-low signal alerts host MCU of time/date/weekday alarm match; requires external pull-up. |
| 4 (GND) | Ground Reference | Primary return path for all analog and digital currents; must be low-impedance connection to minimize noise coupling. |
| 5 (SDA) | I²C Data I/O | Open-drain bidirectional data line; requires external pull-up resistor (typically 2.2–4.7 kΩ) for I²C bus operation. |
| 6 (SCL) | I²C Clock Input | Master-generated clock input synchronizing all I²C transfers; tolerant of 0.2VCC/0.8VCC thresholds. |
| 7 (SQW) | Square-Wave Output | Open-drain programmable clock output; frequency selected via SQWE and RS1/RS0 bits; used for wake-up or sync signals. |
| 8 (VCC) | Power Supply | Accepts 1.3–5.5 V; decoupling capacitor (100 nF ceramic) required near pin to suppress supply noise during I²C transitions. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 Qualification | Validated for −40°C to +125°C operation with PPAP documentation support - meets OEM requirements for powertrain and safety-critical ECUs. |
| Integrated Crystal Load Capacitors | 12 pF on both X1 and X2 pins - eliminates need for external load caps in most designs, reducing BOM count and layout area. |
| Automatic Calendar Rollover | Handles month-end, leap-year (through 2100), and weekday cycling without host intervention - ensures long-term time accuracy. |
| Programmable Alarm Function | Four independent alarm registers (minutes/hours/dates/weekdays) with maskable enable bits - enables precise event scheduling in telematics or gateway modules. |
| Oscillator Stop Flag (OSF) | Dedicated status bit indicating loss of crystal oscillation - allows firmware to trigger time recalibration or fault logging before drift accumulates. |
Applications
| Infotainment System Clock | ADAS Domain Controller Time Sync |
|---|---|
|
Use Scenario: Maintaining accurate wall-clock time and date across ignition cycles in head-unit systems with Bluetooth, navigation, and voice assistant features. IC Role / Device Role / Timing Role: Primary RTC providing BCD-formatted time/calendar data via I²C to application processor; supplies SQW signal for periodic firmware housekeeping tasks. Use Value: Enables timestamped log entries, scheduled software updates, and correct daylight saving time transitions without relying on GPS or network time. |
Use Scenario: Synchronizing sensor fusion timestamps across camera, radar, and ultrasonic subsystems in L2+ automated driving controllers. IC Role / Device Role / Timing Role: Low-jitter, temperature-stable timebase referenced by domain MCU for correlating asynchronous sensor data streams. Use Value: Ensures sub-second alignment of perception outputs for motion prediction and path planning algorithms under extended thermal stress. |
| Body Control Module (BCM) Event Scheduler | Electric Power Steering (EPS) Diagnostic Logger |
|
Use Scenario: Triggering timed functions such as door lock/unlock sequences, interior lighting fade-out, and HVAC pre-conditioning based on user schedules. IC Role / Device Role / Timing Role: Alarm-interrupt-driven scheduler that wakes BCM MCU from low-power state to execute time-based actions. Use Value: Reduces system-level power consumption by eliminating continuous polling; leverages 400 nA backup current to extend battery life during vehicle sleep mode. |
Use Scenario: Timestamping fault codes, torque sensor anomalies, and motor phase errors during EPS actuation for ISO 26262-compliant diagnostic reporting. IC Role / Device Role / Timing Role: Tamper-resistant, non-volatile time source feeding CAN message timestamps and flash memory log headers. Use Value: Supports ASIL-B traceability requirements by anchoring diagnostic events to a certified AEC-Q100 RTC, independent of main MCU clock stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar real-time clock applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Maxim Integrated DS3231M | Higher accuracy (±2 ppm vs. ±20 ppm typical), integrated TCXO, no built-in load caps - requires external 12.5 pF crystals and compensation circuitry. | Better suited for precision instrumentation or GNSS-aided dead reckoning where sub-second annual drift matters. | Choose DS3231M when absolute time accuracy outweighs cost and board space; PT7C4563BQ1WEX offers lower BOM cost and simpler layout for mainstream automotive use. |
| NXP PCF2129A | Lower backup current (200 nA), I²C-only interface, no SQW output - lacks programmable clock generator and alarm flexibility. | Targeted at ultra-low-power body electronics where alarm functionality is unnecessary and SQW is unused. | Choose PCF2129A only for minimal-feature, lowest-current applications; PT7C4563BQ1WEX adds alarm interrupt and four SQW frequencies without increasing footprint or supply range. |
Compared with DS3231M and PCF2129A, PT7C4563BQ1WEX uniquely balances AEC-Q100 qualification, integrated crystal loading, alarm + SQW versatility, and 400 nA backup current in an SOIC-8 package - making it optimal for cost-sensitive, function-rich automotive ECUs requiring robust timekeeping without design complexity.
Availability
PT7C4563BQ1WEX is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS domain controllers, and body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for PT7C4563BQ1WEX 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and integrated circuits, specializing in high-reliability solutions for automotive, industrial, and computing markets.
The PT7C4563BQ1WEX belongs to Diodes' automotive-qualified RTC product line, designed specifically to meet AEC-Q100 Grade 0 requirements and support time-critical functions in engine control, safety, and connectivity systems.
FAQ
Does PT7C4563BQ1WEX require external load capacitors for the 32.768 kHz crystal?
No - PT7C4563BQ1WEX integrates 12 pF load capacitance on both X1 and X2 pins. For standard 12.5 pF-load crystals, only 10 pF external capacitors are recommended; for 6 pF crystals, no external capacitors are needed. This reduces bill-of-materials count and improves layout simplicity in space-constrained automotive modules.
How does the oscillator fail detection (OSF) flag operate in practice?
The OSF bit (bit 7 of Seconds register) is set automatically when the crystal stops oscillating due to breakage, disconnection, or excessive ESR. It remains latched until cleared by firmware writing '0' to that bit. This enables deterministic recovery: host MCU can detect OSF on boot or periodically, then reset time and re-enable oscillator - preventing silent time corruption.
Can the alarm function trigger on weekdays only, ignoring date and time?
Yes - the alarm registers allow independent enabling of minute, hour, date, or weekday fields via AE bits. To trigger only on weekdays, set AE bits for weekday register (0xC) to '0', and set AE bits for minutes/hours/dates to '1'. When the current weekday matches the programmed value, AF is asserted - regardless of time or date - enabling weekly maintenance alerts or service reminders.
What is the maximum allowable crystal ESR, and why does it matter for automotive use?
The PT7C4563BQ1WEX supports crystals with ESR up to 100 kΩ - significantly higher than typical RTCs (often ≤30 kΩ). This accommodates ruggedized, high-stability automotive crystals that maintain frequency accuracy over wide temperature swings and mechanical vibration, ensuring reliable timekeeping in harsh under-hood environments without oscillator stall.
PT7C4563BQ1WEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Clock/Calendar
- Features:
- Alarm
- Memory Size:
- -
- Time Format:
- HH:MM:SS
- Date Format:
- YY-MM-DD-dd
- Interface:
- I2C, SMBus
- Voltage - Supply:
- 1.3V ~ 5.5V
- Voltage - Supply, Battery:
- 3V
- Current - Timekeeping (Max):
- 1.5µA @ 5V
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- 8-SOIC
PT7C4563BQ1WEX FAQ
1.How can I place an order for PT7C4563BQ1WEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PT7C4563BQ1WEX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for PT7C4563BQ1WEX reliable?
The price and inventory of PT7C4563BQ1WEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT7C4563BQ1WEX is usually 5 days.
3.What payment methods are accepted for PT7C4563BQ1WEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT7C4563BQ1WEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PT7C4563BQ1WEX?
PT7C4563BQ1WEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PT7C4563BQ1WEX order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for PT7C4563BQ1WEX?
For technical support, including PT7C4563BQ1WEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT7C4563BQ1WEX requirements.
6.How does Aetrix verify that PT7C4563BQ1WEX is sourced from the original manufacturer or authorized distributors?
All PT7C4563BQ1WEX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PT7C4563BQ1WEX meets industry standards.
7.What is the process for return or replacement of PT7C4563BQ1WEX?
All PT7C4563BQ1WEX units undergo pre-shipment inspection (PSI). If there is an issue with PT7C4563BQ1WEX, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The PT7C4563BQ1WEX part is unused and in its original packaging.
Return procedure for PT7C4563BQ1WEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PT7C4563BQ1WEX Tags
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MCP7940N-I/SN
Microchip Technology
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MCP7940MT-I/MNY
Microchip Technology
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PCF85063ATL/1,118
NXP USA Inc.
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MCP7940NT-I/SN
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MCP7940NT-I/MS
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MCP7940N-I/MS
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PCF85063AT/AY
NXP USA Inc.
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PCF85063TP/1Z
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PCF85063ATT/AJ
NXP USA Inc.
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MCP7940NT-E/SN
Microchip Technology
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MCP7940NT-I/MNY
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MCP79400T-I/SN
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