RICOH Manuals

Rx5C348A/B are CMOS real-time clock ICs connected to the CPU by four signal lines, CE, SCLK, SI, SO, and configured to perform serial transmission of time and calendar data to the CPU.

The RV5C339A is a CMOS real-time clock IC connected to the CPU by three signal lines CE (Chip Enable), SCLK (Serial Clock), and SIO (Serial Input/Output), and configured to perform serial transmission of time and calendar data to the CPU. This model incorporates different functional circuits, including the periodic interrupt circuit, 2 alarm circuits, oscillation circuit, oscillation halt sensing circuit, supply voltage monitoring circuit, 32-kHz clock output function, and oscillation adjustment circuit. The product features ultra-compact size and low power consumption.

The R×5C338A is a 3-wire serial interface real-time clock IC with voltage monitoring function. It is connected to the CPU through three signal lines and performs serial transmission of time and calendar data. It incorporates a periodic interrupt circuit, two alarm circuits, an oscillation circuit, an oscillation halt sensing circuit, a supply voltage monitoring circuit, a 32-kHz clock output function, and an oscillation adjustment circuit.

R2062 SERIES 3 wire interface Real-Time Clock ICs with Battery Backup switch-over Function

R2061 SERIES 3 wire interface Real-Time Clock ICs with Battery Backup switch-over Function

The R2033K/T is a 3 wire interface real-time clock IC, which is a CMOS real-time clock IC using a capacitor oscillator of 32.768kHz as the clock frequency, generating 1 second clock pulses through the internal clock circuit, and generating clock interrupts and calendar interrupts through the internal circuit.

R2221T/L R2223T/L 2-wire Serial Interface Real Time Clock IC is a CMOS real-time clock IC connected to the CPU by two signal lines, SCL, SDA, and configured to perform serial transmission of time and calendar data to the CPU.

The R2051 is a CMOS real-time clock IC connected to the CPU by two signal lines, SCL and SDA, and configured to perform serial transmission of time and calendar data to the CPU.

The R2025S/D is a high-precision I2C bus real-time clock module, built-in CMOS real-time clock IC and crystal oscillator, connected to the CPU by two signal lines, SCL and SDA, and configured to perform serial transmission of time and calendar data to the CPU. The oscillation frequency is adjusted to high precision (0±5 ppm: 15 sec. per month at 25°C) The periodic interrupt circuit is configured to generate interrupt signals with six selectable interrupts ranging from 0.5 seconds to 1 month. The 2 alarm interrupt circuits generate interrupt signals at preset times. As the oscillation circuit is driven under constant voltage, fluctuation of the oscillator frequency due to supply voltage is small, and the time keeping current is small (TYP. 0.48μA at 3V). The oscillation halt sensing circuit can be used to judge the validity of internal data in such events as power-on; The supply voltage monitoring circuit is configured to record a drop in supply voltage below two selectable supply voltage monitoring threshold settings. The 32-kHz clock output function (CMOS output) is intended to output sub-clock pulses for the external microcomputer. The oscillation adjustment circuit is intended to adjust time by correcting deviations in the oscillation frequency of the crystal oscillator.

R2023K/T is a CMOS real-time clock IC connected to the CPU by two signal lines, SCL, SDA, and configured to perform serial transmission of time and calendar data to the CPU. The periodic interrupt circuit is configured to generate interrupt signals with six selectable interrupts ranging from 0.5 seconds to 1 month. The 2 alarm interrupt circuits generate interrupt signals at preset times. As the oscillation circuit is driven under constant voltage, fluctuation of the oscillator frequency due to supply voltage is small, and the time keeping current is small (TYP. 0.45µA at 3V).

The RS5C372A is a CMOS-type I2C bus interface real-time clock IC that uses 2 wires to connect to the CPU and is capable of serially transmitting clock and calendar data to the CPU. The RS5C372A can generate various periodic interrupt clock pulses lasting for long periods (one month), and alarm interrupt can be made by days of the week, hours, and minutes by two incorporated systems. Since an oscillation circuit is driven at a constant voltage, it undergoes fluctuations of few voltage and consequently offers low current consumption (Typ. 0.5μA at 3V). It also provides an oscillator halt sensing function applicable for data validation at power-on and other occasions and 32-kHz clock output for an external micro computer. (Nch. open drain output) The product also incorporates a time trimming circuit that adjusts the clock with higher precision by adjusting any errors in crystal oscillator frequencies based on signals from the CPU. The crystal oscillator may be selected from 32.768kHz or 32.000kHz types. Integrated into an ultra compact and ultra thin 8 pin SSOP package, the RS5C372A is the optimum choice for equipment requiring small sized and low power consuming products.

This product is a CMOS real-time clock IC with I2C bus serial interface and voltage monitoring function

The RV5C387A is a CMOS real-time clock IC connected to the CPU by two signals, SCL and SDA, and configured to perform serial transmission of time and calendar data to the CPU. The periodic interrupt circuit is configured to generate interrupt signals with six selectable interrupts ranging from 0.5 seconds to 1 month. The 2 alarm circuits generate interrupt signals at preset times. The oscillation circuit is driven under constant voltage so that fluctuations in oscillation frequency due to voltage are small and supply current is also small (TYP. 0.35µA for the RV5C387A at 3 volts). The oscillation halt sensing circuit can be used to judge the validity of internal data in such events as power-on. The supply voltage monitoring circuit is configured to record a drop in supply voltage below two selectable supply voltage monitoring threshold settings. The 32-kHz clock output function (Nch. open drain) is intended to output sub-clock pulses for the external microcomputer. The oscillation adjustment circuit is intended to adjust time counts with high precision by correcting deviations in the oscillation frequency of the crystal oscillator. The 32-kHz clock circuit can be disabled by certain register settings. This model comes in an ultra- compact 10-pin SSOP-G (with a height of 1.20mm and a pin pitch of 0.5mm).

The RB5C634A is a one-chip coder equipped with image compression function of generating JPEG2000-compliant codes and decompression function of decoding images from the JPEG2000-compliant codes. It provides powerful encoding and decoding functionality by simply setting up parameters in the internal registers. This coder can process an image of up to 1024 x 1024 pixels within one tile, which presents the ideal solution for reducing the degradation in image quality to a large extent.

The R1283x 2ch DC/DC converter is designed for CCD & OLED Display power source. It contains a step up DC/DC converter and an inverting DC/DC converter to generate two required voltages by CCD & OLED Display. Step up DC/DC converter generates boosted output voltage up to 20V. Inverting DC/DC converter generates negative voltage up to VIN voltage minus 20V independently. Start up sequence is internally made. Each of the R1283x series consists of an oscillator, a PWM control circuit, a voltage reference, error amplifiers, over current protection circuits, short protection circuits, an under voltage lockout circuit (UVLO), an Nch driver for boost operation, a Pch driver for inverting. A high efficiency boost and inverting DC/DC converter can be composed with external inductors, diodes, capacitors, and resistors.