REAL TIME CLOCK MODULE
Time stamp function and Low current consumption
RX4111CE
- - Built in frequency adjusted
32.768 kHz crystal unit - - Interface Type
SPI-Bus interface
- - Low backup current
100 nA Typ. / 3 V
- - Auto power switching function
Automatically switches to backup power supply bymonitoring the VDD voltage
- - Time stamp function
8 times stamped from year to 1/256 seconds.
- - Interrupt output
Wake up every minute or every second
- - Alarm interruption in Day, date,
hour, minute, second - - Auto repeat wakeup timer interruption
- - Self-monitoring interruption
Crystal oscillation stop.VBAT low, VDD low.
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RX4111CE
Design Support Data Download
Block diagram
Overview
- Interface Type
- SPI-Bus interface
- Auto power switching function
- The VDD voltage is monitored and it switches to the backup power supply by the automatic operation
- Backup power supply switching voltage 1.2 V Min.
- Clock output function
- Output frequency is selectable from 32.768 kHz, 1024 Hz,1 Hz
- Wakeup timer function
- Selectable from 244 micro second to 32 years(24 bit 1 ch.)
- Timer source clock selectable from 1/60 Hz, 1 Hz, 64 Hz, 4096 Hz
- Auto release after interrupt output from /INT pin at timer completes
- This operation is auto repeat with a selected cycle, it can be used like a watchdog timer
- Time stamp function
- 8 times stamped from year to 1/256 seconds
- The time-stamp trigger inputs from self-monitoring and SPI command
- Alarm function
- It is possible program from year to second
- Self-monitoring interruption
- Crystal oscillation stop. VBAT low, VDD low
Specifications (characteristics)
Refer to application manual for details
Item Symbol Condition Min. Typ. Max. Unit Operating supply voltage VDD - 1.6 3.0 5.5 V Clock supply voltage VCLK - 1.1 3.0 5.5 V Operating temperature Ta - -40 +25 +85 °C VDD detect voltage -VDET1 VDD, Fall 1.20 1.40 1.60 V Frequency tolerance Δ f / f Ta = +25 °C
VDD = 3.0 VA -11.5 - +11.5 x 10-6 B -23.0 - +23.0 Oscillation startup time tSTA VDD = 2.75 V to 5.5 V - 0.3 1.0 s Current consumption IBAT Input pins = ”L”,
FOUT = OFF, /INT=OFF,
VBAT = 3.0 V, VDD = VIO = 0.0 V
CHGEN = 0b, INIEN = 0b,
SWSEL0 = 1, SWSEL1 = 0- 100 450 nA I32K Input pins = ”L”,
FOUT = 32.768 kHz, /INT = OFF,
VDD = VIO = 3.0 V
FOUT pin CL = 15 pF,
CHGEN = 0b, INIEN = 1b- 2.0 3.0 µA Pin function
Signal Name I / O Function CE input Chip enables input pin CLK input Serial clock input pin DI Input Data input pin DO Output Data output pin FOUT Output Frequency output (CMOS)
(frequency selection: 32.768 kHz, 1024 Hz, 1 Hz)/INT Output Interrupts output by Alarm and Timer events (N-ch. open drain) VDD - Power-supply pin
It can input the voltage unlike VIOVIO - Interface power supply pin
Input to supply the voltage same as a hostVBAT - This is a power supply pin for backup battery
Connect a EDLC, secondary battery, a primary battery
In the backup voltage range, supplied to IC, from this pinGND - Ground pin Terminal connection/External dimensions
(Unit: mm)
Footprint (Recommended)
(Unit: mm)
To maintain stable operation, provide a 0.1uF by-pass capacitor
at a location as near as possible to the power source terminal of the crystal product (between Vcc - GND)Links
Video contents: How to use Real Time Clock Module evaluation board(RX8900CE, RX8804CE)
Video contents: RX8111CE: Battery backup switchover function
Video contents: RX8111CE: Time stamp function
Video contents: RX8111CE: Wake up timer function
Video contents: RX4111CE: Battery backup switchover function
Real Time Clock: RX8900CE / RX8804CE Evaluation Tools
Linux® Driver for Real Time Clock Module
The registered trademark Linux® is used pursuant to a sublicense from LMI (Linux Mark Institute) - · Links to Driver and Video contents