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RA8804CE :I2C-Bus Interface Real Time Clock Module
for Automotive
(Built-in 32.768 kHz-DTCXO)
- Built in frequency adjusted 32.768 kHz crystal unit and DTCXO.
- Interface Type
I2C-Bus interface (400kHz)
- Interface voltage range
1.6 V to 5.5 V
- Temp. compensated voltage range
1.5 V to 5.5 V
- Clock supply voltage range
1.5 V to 5.5 V
- Selectable clock output(32.768 kHz, 1024 Hz, 1 Hz)
- The various functions full calendar, alarm, timer, event detection
- The time-stamp synchronizing to the event detection of EVIN-pin
- The SOUT-pin outputs that selected flag bit value
Video contents: RX8804CE, RA8804CE SOUT Function
- Applications : Car electronics equipment,Industry machine
- AEC-Q100 compliant
- Links to Driver and Video contents
Click here
Design Support Data Download
Block diagram
Overview
- Stability
- XA
± 3.4 x 10-6 / -40 °C to +85 °C ( Equivalent to ±9 seconds of month deviation )
± 8.0 x 10-6 / +85 °C to +105 °C ( Equivalent to ±21 seconds of month deviation ) - XB
± 5.0 x 10-6 / -40 °C to +85 °C ( Equivalent to ±13 seconds of month deviation )
± 8.0 x 10-6 / +85 °C to +105 °C ( Equivalent to ±21 seconds of month deviation )
- XA
- 32.768 kHz frequency output function
- FOUT pin output (C-MOS output), CL = 30 pF
- Output selectable: 32.768 kHz, 1024 Hz, 1 Hz
- Event detection function
- when trigger input to EVIN-pin or specified by program, time and date is recorded.
The EVIN-pin with pull-up resistor that is releasable
- when trigger input to EVIN-pin or specified by program, time and date is recorded.
- Timer function
- Timer source clock are 1min., 1sec., 64Hz, 4096Hz.
- 24-bit-presettable counter (244us to about 32years(280320h) )
- Alarm function
- Alarm function can be set to day of week, day, hour, and minute.
- Internal state output function
- SOUT pin output (C-MOS output).
- it outputs selected flag-bit value or specified value(H or L)
Specifications (characteristics)
Electrical Characteristics
Item | Symbol | Conditions | Min. | Typ. | Max. | Unit | ||
---|---|---|---|---|---|---|---|---|
Operating voltage | VDD | Interface voltage | 1.6 | 3.0 | 5.5 | V | ||
Temp. compensated Voltage | VTEM | Temp. compensated voltage | 1.5 | 3.0 | 5.5 | V | ||
Clock supply voltage | VCLK | Internal clock | 1.5 | 3.0 | 5.5 | V | ||
Operating temperature | TOPR | No condensation | -40 | +25 | +105 | °C | ||
Stability | Δ f/f | XA | Ta = -40 °C to +85 °C | ± 3.4 *1 | x10-6 | |||
Ta = +85 °C to +105 °C | ± 8.0 *2 | |||||||
XB | Ta = -40 °C to +85 °C | ± 5.0 *3 | ||||||
Ta = +85 °C to +105 °C | ± 8.0 *2 | |||||||
Current consumption(1) | lDD1 | fSCL = 0Hz , /INT = VDD FOE = GND FOUT:OFF Temp.Compensation interval 2.0 s. |
VDD=5V | - | 0.4 | 1.6 | µA | |
Current consumption(2) | lDD2 | VDD=3V | - | 0.35 | 1.5 |
*1 Equivalent to ±9 seconds of month deviation.
*2 Equivalent to ±21 seconds of month deviation.
*3 Equivalent to ±13 seconds of month deviation.
32.768 kHz-DTCXO Frequency temperature characteristics (Example)
Pin function
Signal Name | I / O | Function |
---|---|---|
SOUT | Output | Internal state output pin. |
SCL | Input | Serial clock input pin. |
FOUT | Output | The pin outputs the reference clock signal. ( CMOS output ) |
EVIN | Input | Event input pin |
VDD | - | Connected to a positive power supply |
FOE | Input | The input pin for the FOUT output control. |
/ INT | Output | Interrupt output (N-ch. open drain). |
GND | - | Connected to a ground |
T2 | - | Use only for testing in the factory ( Do not connect externally.) |
SDA | I/O | Data input and output 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
Video contents: RX8804CE, RA8804CE SOUT Function
Real Time Clock: RX8900CE / RX8804CE Evaluation Tools
Linux® Driver for Real Time Clock Module