RX8900CE :I2C-Bus Interface Real Time Clock Module
(Built-in 32.768 kHz-DTCXO, High Stability and Power Switching)
- Built in frequency adjusted 32.768 kHz crystal unit and DTCXO.
- Interface Type
I2C-Bus interface (400kHz)
- Interface voltage range
2.5V to 5.5V
- Temp. compensated voltage range
2.0V to 5.5V
- Clock supply voltage range
1.6V to 5.5V
- Selectable clock output(32.768 kHz, 1024 Hz, 1 Hz)
- The various functions include full calendar, alarm, timer, temp. sensor function.
- :CE package only
- * The I2C-BUS is a trademark of NXP Semiconductors.
Block diagram
Overview
- High Stability
- UA ± 3.4 x 10-6 / -40 °C to +85 °C ( Equivalent to 9 seconds of month deviation )
- UB ± 5.0 x 10-6 / -40 °C to +85 °C ( Equivalent to 13 seconds of month deviation )
- UC ± 5.0 x 10-6 / -30 °C to +70 °C ( Equivalent to 13 seconds of month deviation )
- 32.768 kHz frequency output function
- FOUT pin output (C-MOS output), CL=30 pF
- Output selectable: 32.768 kHz, 1024 Hz, 1 Hz
- Available automatic battery backup switch-over function
- When VDD deteriorates, internal source is switched to VBAT.
- Timer function
- Timer function can be set up between 1/4096 second and 4095 minutes.
- Alarm function
- Alarm function can be set to day of week, day, hour, and minute.
- Temp. sensor function
- The temperature data are output to a register by a temp. sensor function. (Bank.2_Add17h)
Pin function
Signal Name | I / O | Function |
---|---|---|
T1(CE) | input | Use by the manufacture for testing. ( Do not connect externally.) |
SCL | input | Serial clock input pin. |
FOUT | output | The pin outputs the reference clock signal. ( CMOS output ) |
VBAT | - | Battery supply. This pin has charge capability to backup battery. |
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(VPP) | - | Use by the manufacture for testing. ( Do not connect externally.) |
SDA | I/O | Data input and output pin. |
Terminal connection/External dimensions
(Unit: mm)
The metal case inside of the molding compound may be exposed on the top or bottom of this product.
This purely cosmetic and does not have any effect on quality, reliability or electrical specs.
Specifications (characteristics)
Refer to application manual for details.Electrical Characteristics
Item | Symbol | Conditions | Min. | Typ. | Max. | Unit | ||
---|---|---|---|---|---|---|---|---|
Operating voltage | VDD | Interface voltage | 2.5 | 3.0 | 5.5 | V | ||
Temp. compensated Voltage | VTEM | Temp. compensated voltage | 2.0 | 3.0 | 5.5 | V | ||
Clock supply voltage | VCLK | Internal clock | 1.6 | 3.0 | 5.5 | V | ||
Operating temperature | TOPR | No condensation | -40 | +25 | +85 *3 | °C | ||
Stability | Δ f/f | UA | Ta=-40°C to+85°C |
±3.4 *1 | x10-6 | |||
UB | Ta=-40°C to+85°C |
±5.0 *2 | ||||||
UC | Ta=-30°C to+70°C | |||||||
Current consumption(1) | lDD1 | fSCL=0Hz,/INT=VDD, FOE=GND, VDD=VBAT FOUT:OFF Temp. Compensation interval 2.0 s. |
VDD=5V | - | 0.72 | 1.5 | µA | |
Current consumption(2) | lDD2 | VDD=3V | - | 0.70 | 1.4 |
*1)Equivalent to 9 seconds of month deviation. *2)Equivalent to 13 seconds of month deviation.
*3)Please contact us about +85°C < TOPR
32.768 kHz-DTCXO Frequency temperature characteristics (Example)