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Renesas ISL12029IBZ
- Part No.:
- ISL12029IBZ
- Manufacturer:
- Renesas
- Category:
- Real Time Clocks
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL12029IBZ.pdf
- Description:
- IC RTC CLK/CALENDAR I2C 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,031
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Product details
Overview
ISL12029IBZ from Intersil is a low-power real-time clock/calendar IC with integrated 512×8-bit EEPROM, I²C interface, dual non-volatile alarms, CPU supervisor (POR, watchdog timer, low-voltage reset), and automatic battery backup switching. It operates from 2.7V to 5.5V, maintains timekeeping down to 1.8V on VBAT, and supports ±30ppm digital crystal compensation via 64-position trim capacitor. Used in utility meters and network infrastructure for accurate time stamping and configuration retention.
For engineers reviewing the ISL12029IBZ datasheet, ISL12029IBZ pinout, ISL12029IBZ application, or ISL12029IBZ equivalent, this page delivers verified specifications including VDD/VBAT power control modes, 400kHz I²C timing compliance, 800nA battery supply current, 50-year EEPROM data retention, and IRQ/FOUT dual-function pin behavior under battery backup.
Technical Context
The ISL12029IBZ implements a fully autonomous RTC subsystem with separate volatile timekeeping registers (seconds–year, day-of-week) and non-volatile alarm registers, all synchronized to an external 32.768kHz crystal. Its oscillator includes on-chip feedback resistor and digitally controlled trim capacitors enabling ±30ppm frequency adjustment across temperature.
Power management integrates intelligent VDD-to-VBAT switchover with 2.6V VTRIP threshold and 50mV hysteresis, while CPU supervision provides three watchdog timeout options (0.25s/0.75s/1.75s) and five selectable reset voltage thresholds (2.63V–4.64V). The I²C interface remains functional during battery backup when enabled via control register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Range | 2.7V to 5.5V - supports standard industrial logic rails and ensures full RTC+EEPROM operation |
| VBAT Operating Range | 1.8V to 5.5V - enables reliable timekeeping during main power loss using coin cell or supercap |
| Battery Supply Current | 800nA at VBAT = 1.8V - minimizes backup power drain for >10-year battery life in metering applications |
| I²C Speed | 400kHz - compatible with fast-mode I²C controllers without timing margin compromise |
| EEPROM Capacity | 512×8 bits (32 pages × 16 bytes) - sufficient for firmware config, calibration data, and event logs |
| Crystal Compensation | 64-position digital trim capacitor, ±30ppm adjustment - eliminates external load capacitors and enables factory/system-level calibration |
| Alarm Capability | Two independent non-volatile alarms with repeat mode - supports periodic wake-up or status-triggered interrupts without host polling |
| Reset Threshold | 4.38V (ISL12029IBZ specific) - matches 5V system brown-out detection requirements with 250ms power-up delay |
Pinout & Package
ISL12029IBZ is housed in a 14-lead SOIC package (Pb-free, RoHS compliant, pkg drawing M14.15), with thermal resistance θJA = 90°C/W. Pin 1 is X1 (crystal input); pins 3, 4, 5, 10, 11 are NC; pin 13 is VBAT (backup supply); pin 14 is VDD (main supply).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| X1 | Crytal oscillator input | Inverting amplifier input for 32.768kHz quartz crystal; no external components required |
| X2 | Crytal oscillator output | Amplifier output driving crystal; must not connect to external loads |
| RESET | Open-drain reset output | Active-low signal asserting on VDD undervoltage or watchdog timeout; requires 5kΩ pull-up |
| GND | Ground reference | Common return for VDD, VBAT, I²C, and RTC circuitry |
| VDD | Main power supply | Primary operating voltage source (2.7–5.5V); powers all digital and analog blocks except backup domain |
| VBAT | Backup power supply | Supplies RTC, alarms, and SRAM during VDD failure; valid down to 1.8V |
| IRQ/FOUT | Multi-function open-drain pin | Configurable as alarm interrupt or 1Hz/4.096kHz/32.768kHz clock output; software-selectable via control register |
| SCL | I²C clock input | Asynchronous serial clock; always active buffer enables reliable communication during power transitions |
| SDA | I²C bidirectional data | Open-drain bus line supporting wire-OR with other I²C devices; slope-controlled pull-down ensures 400kHz timing |
Key Features
| Feature | Design Value |
|---|---|
| Automatic battery switchover | Hardware-controlled transition to VBAT upon VDD failure with 800nA quiescent current preserves multi-year backup runtime |
| Digital crystal compensation | 64-step trim capacitor + 6 frequency settings enable ±30ppm accuracy tuning without external components or manual calibration |
| Non-volatile alarm registers | Two independent alarms retain settings across power cycles and support second-/minute-/hour-/date-/day-of-week–based triggers with repeat mode |
| BlockLock™ EEPROM protection | 8 configurable lock modes prevent accidental overwrite of critical calibration or security data while allowing user-defined write zones |
| Watchdog timer with selectable timeouts | Three fixed periods (0.25s/0.75s/1.75s) provide flexible system recovery granularity without external timing components |
| I²C operation in battery mode | Register-enabled SDA/SCL functionality during VBAT-only operation allows real-time configuration updates without main power restoration |
Applications
| Utility Metering | Network Infrastructure |
|---|---|
Use Scenario: Time-stamping energy consumption data and storing tamper logs in smart electricity/water/gas meters. IC Role / Device Role / Timing Role: Primary RTC and non-volatile event logger; maintains calendar-correct time through 2099 with leap-year handling. Use Value: Enables regulatory-compliant billing intervals and secure audit trails using 50-year EEPROM retention and hardware alarm-triggered logging. |
Use Scenario: Providing synchronized time base for packet timestamping, SNMP trap generation, and firmware update scheduling in routers/switches. IC Role / Device Role / Timing Role: System-level timekeeper and configuration storage; supplies 1Hz interrupt for OS scheduler and stores boot parameters in protected EEPROM pages. Use Value: Eliminates reliance on NTP during boot or network outage via local high-accuracy time source and retains critical settings across power cycles. |
| HVAC Control Systems | Industrial Test Equipment |
Use Scenario: Scheduling compressor cycles, logging sensor history, and triggering maintenance alerts based on runtime hours in commercial HVAC units. IC Role / Device Role / Timing Role: Real-time scheduler and non-volatile memory manager; uses dual alarms for daily maintenance reminders and seasonal mode changes. Use Value: Reduces firmware complexity by offloading time-based decision logic to hardware alarms and preserves calibration data across field upgrades. |
Use Scenario: Recording measurement timestamps, calibration coefficients, and pass/fail results in portable multimeters and automated test fixtures. IC Role / Device Role / Timing Role: Precision time anchor and secure configuration store; leverages 32.768kHz crystal stability and BlockLock™ to protect metrology-critical parameters. Use Value: Ensures traceable measurement integrity with tamper-resistant EEPROM and eliminates time drift errors in long-duration automated tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar real-time clock/calendar applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS1339U+T&R | Maxim Integrated RTC with 32.768kHz oscillator, no integrated EEPROM, lower battery current (300nA), but lacks CPU supervisor functions | Requires external EEPROM and reset supervisor IC for full ISL12029IBZ functionality | Select when ultra-low battery drain is prioritized over integration density and system supervision capability |
| PCF2129AT | NXP RTC with integrated EEPROM (256B), auto-compensation, but only one alarm register and no watchdog timer | Lacks second alarm and programmable reset threshold; limited alarm flexibility for complex scheduling | Choose for cost-sensitive designs where single-alarm scheduling suffices and external watchdog is acceptable |
Compared with DS1339U+T&R and PCF2129AT, the ISL12029IBZ uniquely combines dual non-volatile alarms, 512-byte EEPROM with BlockLock™, CPU supervisor (POR/WDT), and ±30ppm digital crystal compensation in a single 14-pin SOIC - reducing BOM count and PCB area while enabling autonomous time-critical operations without host intervention.
Availability
ISL12029IBZ is available at Aetrix Electronics and suitable for utility metering, network infrastructure, and industrial test equipment requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for ISL12029IBZ 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
Intersil Corporation (now part of Renesas Electronics) designs high-performance analog and mixed-signal ICs for precision timing, power management, and interface applications.
The ISL12029IBZ belongs to Intersil's real-time clock family engineered for industrial-grade reliability, extended temperature operation (–40°C to +85°C), and seamless integration into resource-constrained embedded systems requiring autonomous timekeeping and non-volatile state retention.
FAQ
What is the VBAT trip point and reset voltage threshold for ISL12029IBZ?
The ISL12029IBZ has a VBAT mode threshold (VTRIP) of 1.8V to 2.6V with 50mV hysteresis, and its factory-configured reset voltage (VRESET) is 4.38V ±50mV. This setting ensures reliable brown-out detection in 5V systems while maintaining compatibility with legacy power-supply monitoring circuits. The ISL12029IBZ does not support dynamic VRESET adjustment via pins - selection is fixed per ordering code.
Does ISL12029IBZ support I²C communication during battery backup mode?
Yes, ISL12029IBZ supports I²C communication during VBAT-only operation when the SBIB bit in the control register is set to '1'. This enables real-time reading of RTC registers, updating alarm settings, or writing to EEPROM without restoring VDD. However, the RESET output is disabled in battery mode, and the watchdog timer is automatically deactivated to conserve current.
How does the crystal compensation feature work in ISL12029IBZ?
The ISL12029IBZ integrates a 64-position digitally controlled trim capacitor and six preset frequency adjustment settings (±30ppm range) to calibrate oscillator accuracy against temperature drift. Compensation is applied by writing to the ATR register; no external capacitors or resistors are needed. This allows factory trimming or system-level calibration using an external temperature sensor and microcontroller, eliminating manual tuning.
What is the EEPROM endurance and data retention specification for ISL12029IBZ?
The ISL12029IBZ provides 512×8-bit EEPROM with guaranteed endurance of >2,000,000 write/erase cycles per byte and 50-year data retention at temperatures ≤+75°C. BlockLock™ protection supports eight independent lock modes to safeguard critical configuration or calibration data, while permitting unrestricted writes to designated user pages - essential for field-upgradable firmware parameters.
Can ISL12029IBZ generate multiple frequency outputs on the IRQ/FOUT pin?
Yes, ISL12029IBZ can configure the IRQ/FOUT pin to output 1Hz, 4.096kHz, or 32.768kHz signals via software control of the frequency-out bits in the control/status register. When not used for frequency output, the same pin serves as an open-drain interrupt output for alarm events. Pull-up resistor selection (recommended 5kΩ–10kΩ) must balance waveform fidelity and current draw to avoid oscillator perturbation.
ISL12029IBZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Clock/Calendar
- Features:
- Alarm, Leap Year, Supervisor, Watchdog Timer
- Memory Size:
- -
- Time Format:
- HH:MM:SS (12/24 hr)
- Date Format:
- YY-MM-DD-dd
- Interface:
- I2C, 2-Wire Serial
- Voltage - Supply:
- 2.7V ~ 5.5V
- Voltage - Supply, Battery:
- 1.8V ~ 5.5V
- Current - Timekeeping (Max):
- 10µA ~ 20µA @ 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 14-SOIC
ISL12029IBZ FAQ
1.How can I place an order for ISL12029IBZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL12029IBZ 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 ISL12029IBZ reliable?
The price and inventory of ISL12029IBZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL12029IBZ is usually 5 days.
3.What payment methods are accepted for ISL12029IBZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL12029IBZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL12029IBZ?
ISL12029IBZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL12029IBZ 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 ISL12029IBZ?
For technical support, including ISL12029IBZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL12029IBZ requirements.
6.How does Aetrix verify that ISL12029IBZ is sourced from the original manufacturer or authorized distributors?
All ISL12029IBZ 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 ISL12029IBZ meets industry standards.
7.What is the process for return or replacement of ISL12029IBZ?
All ISL12029IBZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL12029IBZ, 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 ISL12029IBZ part is unused and in its original packaging.
Return procedure for ISL12029IBZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL12029IBZ Tags
-
MCP7940N-I/SN
Microchip Technology
-
MCP7940MT-I/MNY
Microchip Technology
-
PCF85063ATL/1,118
NXP USA Inc.
-
MCP7940NT-I/SN
Microchip Technology
-
MCP7940NT-I/MS
Microchip Technology
-
MCP7940N-I/MS
Microchip Technology
-
PCF85063AT/AY
NXP USA Inc.
-
PCF85063TP/1Z
NXP Semiconductors
-
PCF85063ATT/AJ
NXP USA Inc.
-
MCP7940NT-E/SN
Microchip Technology
-
MCP7940NT-I/MNY
Microchip Technology
-
MCP79400T-I/SN
Microchip Technology
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