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RV-2251-C3

Product catalog summary

Overview: The RV-2251-C3 is a Real Time Clock Module with an I2C Bus, featuring a Smart Backup Supply and Battery Management System. It includes a voltage regulator output for ML rechargeable batteries and a level shifter for CPU interfacing.

Specifications: The module supports a calendar function with automatic leap year calculation and a clock function in 12 or 24-hour format. It offers two programmable alarm settings and a periodic interrupt function. The device is available in a miniature SMT ceramic package with an integrated 32.768kHz crystal and is automotive qualified according to AEC-Q200 Rev. C.

Key Features:

Smart Backup Supply and Battery Management System
3.0 V Regulated Output for ML rechargeable batteries
Level shifter for CPU interface
Two Alarm Interrupt circuits
Periodic Interrupt function
Very low power consumption
I2C Bus Interface (400 kHz)
Time keeping down to 0.7 V

Environmental Characteristics:

Storage temperature range: –55 to +125°C
Operating temperature range: –40 to +85°C
Shock resistance: 5000 g, 0.3 ms, ½ sine +/-5 ppm
Vibration resistance: 20 g / 10–2000 Hz +/-5 ppm

Electrical Characteristics at 25°C:

Peripheral voltage (VIO): 1.8 to 5.5 V
Supply voltage (VOUT): 0.7 to 5.5 V
Power current during access: 20 μA at 400 kHz, 5V; 7 μA at 100 kHz, 3V
Current consumption in Time keeping mode: 270 to 380 nA (ECO off), 210 to 320 nA (ECO on)
CLKOUT frequency: 32768 Hz
Frequency tolerance: ±20 ppm at 25°C
Aging first year max: ±3 ppm at 25°C
Frequency vs. temperature: –0.035 ppm/°C² (T - T0)² ±10% ppm

Pin Connections:

1: VIOL - VIO Monitoring Output
2: INT - Interrupt Output
3: SDA - Serial Data
4: ECO - Oscillator Mode Select
5: VIO - Peripheral Supply
6: SCL - Serial Clock Input
7: VSS - Ground
8: CLKOUT - 32.768 kHz Clock Output
9: VBAT - Backup Power Supply
10: VREG - Voltage Regulator Output
11: VOUT - Internal Supply
12: VDD - Main Power Supply

Additional Information: The module is 100% lead-free and RoHS compliant. It is available for SMD mounting with Au plated pads and supports reflow soldering at 260°C for a maximum of 20 seconds.

Catalog excerpts

Real Time Clock Module with I2C Bus DIMENSIONS Package: 100% leadfree, RoHS - compliant Miniature SMT ceramic package with integrated 32.768kHz Crystal Automotive qualified, according to AEC-Q200 Rev. C Smart Backup Supply and Battery Management System 3.0 V Regulated Output for ML rechargeable batteries Level shifter for CPU interface Two Alarm Interrupt circuits Periodic Interrupt function Very low power consumption I2C Bus Interface (400 kHz) Time keeping down to 0.7 V DESCRIPTION: The RV-2251-C3 includes a Smart Backup Supply and Battery Management System with Automatic Backup Switchover. A voltage regulator output with VREG = 3.0 V is provided for ML rechargeable batteries. Additionaly, a level shifter with monitored power supply input VIO is integrated for interfacing with CPU (I2C and CLKOUT). The calendar function tracks Weekdays, Date, Month and Years with automatic leap year calculation. The clock function tracks Seconds, Minutes and Hours in 12 or 24 hour format. Two programmable Alarm settings and a Periodic Interrupt function increase ﬂexibility. For pick-and-place equipment, the parts are available in 12 mm tape: 7” (178 mm) reel with 1'000 parts 7” (178 mm) reel with 3'000 parts BLOCK DIAGRAM: VOLTAGE DETECTOR1 VDD VREG VOLTAGE REGULATOR INTERNAL POWER SUPPLY & POR BATTERY MONITOR XTAL OSC FREQUENCY DIVIDER & OFFSET COMPENSATION VIOL CONTROL LEVEL SHIFTER nINT CONTROL SYSTEM CONTROL LOGIC Seconds Minutes Hours Weekdays Date Months Years Offset Alarm_W Minutes Alarm_W Hours Alarm_W Weekday Alarm_D Minutes Alarm_D Hours RAM Control1 Control2

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Symbol Peripheral voltage Time keeping Supply voltage Power current during access Current consumption Time keeping mode CLKOUT frequency Frequency tolerance Aging ﬁrst year max. 1) Tighter and wider frequency tolerances on request. ENVIRONMENTAL CHARACTERISTICS: Conditions Storage temp. range TA Operating temperature range Shock resistance Vibration resistance For SMD mounting Au plated pads FREQUENCY TEMPERATURE CHARACTERISTICS: Tuning Fork Crystal Production Date Code 11 Connection VIO Monitoring Output VIOL INT Interrupt Output SDA Serial Data ECO Oscillator Mode Select VIO Peripheral Supply...

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