PT7C4339/4339C Real-time Clock Module Features Description Real-Time Clock (RTC) Including Time (Seconds, The PT7C4339 real-time clock is a low-power Minutes and Hours) and Calendar (Day, Date, clock/calendar device with two programmable time-of- Month and Year with Leap-Year Compensation day alarms and a programmable square-wave output. 2 Valid Up to 2100) counter functions (BCD code) Address and data are transferred serially through an I C Available in a Surface-Mount Package with an bus. The clock/calendar provides seconds, minutes, Integrated Crystal (Only for PT7C4339C) hours, day, date, month, and year information. The date 2 2 I C Serial Interface supports I C-Bus s high speed at the end of the month is automatically adjusted for mode (400 kHz) months with fewer than 31 days, including corrections Programmable square wave output signal, defaults for leap year. The clock operates in either the 24-hour or to 32 kHz on Power-up 12-hour format with AM/PM indicator. The PT7C4339 Two Time-of-Day Alarms has a build-in power-sense circuit that detects power Oscillator Stop Flag failures and automatically switch to the backup supply, Automatic Power-Fail Detect and Switch Circuitry Temperature Range: -40C to +85C maintaining time, date, and alarm operation. Package: MSOP-8L and SOIC-8L for PT7C4339 Pin Configuration TDFN4x4-8L for PT7C4339C PT7C4339 PT7C4339C Applications 1 X1 8 1 8 V CC NC NC 2 X2 SQW/INT 7 2 V 7 BACKUP SCL 3 6 3 6 V BACKUP SCL GND SQW/INT V 4 5 4 5 GND SDA CC SDA SOIC-8 DFN4*4-8L MSOP8 Table1. Diverse functions of RTC circuits Item Function PT7C4339 PT7C4339C Source External crystal External crystal Integrated Crystal 1 Oscillator Oscillator enable/disable Oscillator fail detect 12-hour Time display 24-hour 2 Time Century bit Time count chain enable/disable 3 Interrupt Alarm interrupt output 2 2 4 Programmable square wave output (Hz) 1, 4.096k, 8.192k, 32.768k 1, 4.096k, 8.192k, 32.768k 2 5 Communication 2-wire I C bus 6 Power failure detect 2015-08-0008 PT0508-1 08/24/15 1 PT7C4339/4339C Real-time Clock Module Pin Description Pin No Pin Type Description 4339 4339C Name Oscillator Circuit Input. Together with X1, 32.768kHz crystal is connected between them. Or 1 / X1 I external clock input. Oscillator Circuit Output. Together with X1, 32.768kHz crystal is connected between them. 2 / X2 O When 32.768kHz external input, X2 must be float. 2 Serial Clock Input. SCL is used to synchronize data movement on the I C serial interface. The 6 7 SCL I pull up voltage may be up to 5.5V regardless of the voltage on V . CC Serial Data Input/Output. SDA is the input/output pin for the 2-wire serial interface. The SDA 5 4 SDA I/O pin is open-drain output and requires an external pull-up resistor. The pull up voltage may be up to 5.5V regardless of the voltage on V . CC Secondary Power Supply. Supply voltage must be held between 1.3V and 3.7V for proper operation. This pin can be connected to a primary cell, such as a lithium button cell. Additionally, V this pin can be connected to a rechargeable cell or a super cap when used in conjunction with the BACKU 3 2 O trickle-charge feature. Diodes should not be placed in series between the backup source and the P V input, or improper operation will result. If a backup supply is not required, V must BACKUP BACKUP be grounded. Square-Wave/Interrupt Output. Programmable square-wave or interrupt output signal. It is an SQW 7 6 O open-drain output and requires an external pull up resistor. The pull up voltage may be up to 5.5V /INT regardless of the voltage on V . If not used, this pin may be left unconnected. CC Power. When voltage is applied within normal limits, the device is fully accessible and data can be written and read. When a backup supply is connected and V is below V , reads and writes are CC PF 8 5 V P CC inhibited. The timekeeping and alarm functions operate when the device is powered by V or CC V . BACKUP 4 3 GND P Ground. / 1,8 NC No Connect. These pins are not connected internally, but must be grounded for proper operation. Maximum Ratings o o Storage Temperature .................................................................................... -55 C to +125 C Note: o o Stresses greater than those listed under MAXIMUM Ambient Temperature with Power Applied.............................................. -40 C to +85 C RATINGS may cause permanent damage to the Supply Voltage to Ground Potential (V to GND) .................................. -0.3V to +6.0V CC device. This is a stress rating only and functional DC Input (All Other Imputs except V & GND) ........................... -0.3V to V +0.3V CC CC operation of the device at these or any other condi- DC Output Voltage (SDA, SQW /INT pins) ............................................. -0.3V to +6.0V tions above those indicated in the operational sec- Power Dissipation ................................................................... 320mW(depend on package) tions of this specification is not implied. Exposure o Lead Temperature (soldering, 10s) ............................................................................+260 C to absolute maximum rating conditions for extended o periods may affect reliability. Soldering Temperature (reflow) .................................................................................+260 C Recommended Operating Conditions Symbol Description Min Type Max Unit V Supply Voltage 3.0 3.3 5.5 V CC V Backup Supply Voltage 1.3 3.0 3.7 V BACKUP V Input high level 0.7V - V +0.3 V IH CC CC V Input low level -0.3 - 0.3V V IL CC V Power-Fail Voltage 1.60 1.72 1.88 V PF T Operation Temperature -40 - 85 C A 2015-08-0008 PT0508-1 08/24/15 2