June 6, 2006
Epson Toyocom Announces RX-4575LC Real Time Clock Module with
Chattering-Free*1 Input Detection Port
Epson Toyocom Corporation, the leader in quartz devices, today announced the development of
a new real time clock module with a built-in crystal unit. The RX-4575LC contains a feature
that generates an interrupt signal when an external input signal is detected. Samples will begin
shipping in June 2006.
As more features are packed into small electronic devices, the main CPU and controller chips in
these devices are running out of I/O ports, forcing designers to choose between a variety of
signals. Epson Toyocom developed a multi-function real time clock module with two chattering-
free inputs to relieve this kind of hardware resource shortage. The addition of these inputs
simplifies the circuit design process by removing the need for an external chattering elimination
circuit, and by enabling I/O ports to detect different kinds of signals.
Input detection port features
・
Input signal detection: Select and use either hardware interrupt signal generation or
serial-based software monitoring, depending on the system
・
・
Pull-up and pull-down resistance built into each port: Can be disconnected as required
Variable chattering absorption time: Set input signal detection responsiveness to a high
level of accuracy
・
Time-out after signal detection: A power-saving feature that automatically disconnects
built-in resistance after input signal detection
Main specifications
Item
RX-4575LC specifications
Operating power-supply voltage
Standby current consumption
Chattering free variable rate
Pull-up/down resistance
1.6V to 5.5V
(Typ.)
0.35 µA
/ 3V
8 ms, 31 ms, 62 ms, 125 ms
(Typ.)
60 kΩ
/ 3V
Dimensions
3.6 × 2.8 × 1.2 mm (12-pin VSOJ)
・ Three-line serial interface
・ Built-in 32.768 kHz crystal unit: 5 ± 23 × 10-6 frequency stability
・ Automatic leap year correction, full calendar clock
・ Day, hour, minute alarm 12-bit timer interrupt function
・ Two input detection terminals
・ Two interrupt output terminals
・ OE-enabled 32.768 kHz CMOS output
