Ricoh manuals, page 7
RICOH I 2 C bus SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION RV5C387A Manual
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).
RICOH RB5C634A Manual
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.
RICOH R1283x SERIES 2ch DC/DC for CCD OLED handbook
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.
RICOH R1283K Series PWM Step-up/Inverting DC/DC Converter for CCD/LCD handbook
The R1283K Series are dual output CMOS-based PWM step-up/inverting DC/DC converters. R1283K includes a soft start circuit, an under-voltage lockout circuit (UVLO), and a latch protection circuit. By simply using inductors, resistors, capacitors, and diodes as external components, a high-efficiency step-up/inverting DC/DC converter can be easily configured. While R1280D need using an external transistor, R1283K has internal 400mΩ ON resistance transistors for both step-up and inverting. Start-up sequence of two DC/DC converters can be selected. Since the shutdown sequence can also be set by the auto-discharge function of the inverting DC/DC converter, the products are ideally suitable for applications that require setting of power supply start-up/shutdown sequence for CCD, LCD, and OLED.
RICOH R1286K SERIES 2ch DCDC (Step Up DC/DC Inverting DC/DC) handbook
The R1286 series 2ch DC/DC power converter is designed for AMOLED display power source. It contains a step up DC/DC converter and an inverting DC/DC converter. Step up DC/DC converter generates boosted output voltage to 4.6V ~ 5.8V(Selectable). Inverting DC/DC converter generates negative voltage down to -2.0V ~ -6.0V(Selectable) that is dynamically adjustable with single wire interface signal. R1286 consist of a voltage reference, error amplifiers, an oscillator, PWM control circuits, over current protection circuits, short protection circuits, an under voltage lockout circuit (UVLO), thermal shutdown circuit, a NMOS driver and a synchronous PMOS switch for boost converter, a PMOS driver and a synchronous NMOS switch for inverting converter, and so on. High efficiency boost and inverting DC/DC converters can be composed with two external inductors and three capacitors.
RICOH R1286K Series PWM Step-up/Inverting DC/DC Converter for AMOLED/LCD with synchronous rectifier handbook
The R1286K Series are CMOS-based PWM step-up/inverting DC/DC converters featuring 250mA×2 output current with synchronous rectifier. R1286K includes a soft start circuit, an under-voltage lockout circuit (UVLO), a latch protection circuit, a thermal shutdown circuit, and a shutdown circuit. By simply using two inductors and three capacitors as external components, a high-efficiency step-up/inverting DC/DC converter can be easily configured. R1286K is available in two types: R1286K001B is the type to which the output voltage (VOUTP and VOUTN) can be adjusted by external resistors. R1286KxxxA/C~M are the type to which the step-up output voltage (VOUTP) is internally fixed and the inverting output voltage (VOUTN) can be adjusted dynamically by the single wire interface. The R1286K has a sequenced start up. After the CE pin is enabled, the step-up output is starting up followed by the inverting output after a delay time. As for shutdown, both outputs will be turned off by the auto-discharge function. R1286K is used for applications such as LCD and AMOLED displays.
RICOH R1215D SERIES STEP-UP DC/DC CONTOLLER handbook
The R1215D Series are CMOS-based PWM step-up DC/DC converter controllers with low supply current. Each of the R1215D Series consists of an oscillator, a PWM comparator circuit, a reference voltage unit, an error amplifier, a reference current unit, a protection circuit, and an under voltage lockout (UVLO) circuit. A low ripple, high efficiency step-up DC/DC converter can be composed of this IC with some external components, or an inductor, a diode, a power MOSFET, resisters, and capacitors. Maximum duty cycle and the soft start time are easily adjustable with external resistors and capacitors. As for the protection circuit, after the soft-starting time, if the maximum duty cycle is continued for a certain period, the R1215D Series latch the external driver with its off state, or the latch-type protection circuit works. The delay time for latch the state can be set with an external capacitor. To release the protection circuit, restart with power-on (Voltage supplier is equal or less than UVLO detector threshold level).
RICOH R1215D Series PWM Step-up DC/DC Controller handbook
The R1215D Series are low supply current CMOS PWM step-up DC/DC controllers. R1215D does not include an internal output transistor. By simply using a power MOS, an inductor, a diode, resistors, and capacitors as external components, a high-efficiency step-up DC/DC converter can be easily configured.
RICOH R1212D SERIES STEP-UP DC/DC CONTROLLER handbook
R1212D series step-up DC/DC controller is a low-power, low-noise step-up DC/DC converter controller, suitable for various products that require high reliability, high efficiency and small size.
RICOH R1212D Series PWM Step-up DC/DC Controller handbook
RICOH R1211x SERIES PWM STEP-UP DC/DC CONTROLLER handbook
R1211x Series PWM step-up DC/DC controller is a low supply current CMOS-based PWM step-up DC/DC converter controller.
RICOH R1211x Series PWM Step-up DC/DC Controller datasheet
RICOH RP401x SERIES HIGH EFFICIENCY SMALL PACKAGES STEP-UP DC/DC CONVERTERS handbook
RP401x Series are high efficiency, step-up DC/DC converter ICs packaged in compact 5pin SOT23-5， or 6pin DFN(PLP)1820-6. This IC can start up from low voltage (Typ.0.6V), therefore, it is suitable for using with single or 2 serial alkaline batteries, or a nickel-metal-hydride (NiMH) battery, or one-cell Lithium-ion (Li+) battery. This IC consists of an oscillator, a reference voltage unit with soft start, a chip enable circuit, an error amplifier, phase compensation circuits, a slope circuit, a PWM control circuit, a start-up circuit, a PWM/VFM mode control circuit, internal switches and a protection circuit. A low ripple high efficiency step-up DC/DC converter can be composed of the RP401x with only an inductor, a diode, (resisters for adjustable type), and capacitors. The output voltage of the RP401K001s is adjustable, and others are fixed internally. The output voltage range is from 1.8V to 5.5V. RP401Kxx1A/B series have a MODE pin to alternate between PWM fix and PWM/VFM automatic shift to improve the efficiency at light load. If MODE pin is set 'H', the mode is PWM fix, and when the MODE pin is set 'L', PWM/VFM automatic shift. The RP401xxx1C and D do not have MODE pin. The RP401xxx1C is PWM/PFM alternative type, and the RP401xxx1D is PWM fixed type.
RICOH RP401x Series PWM/VFM Step-up DC/DC Converter handbook
The RP401x Series are CMOS-based PWM/VFM step-up DC/DC converters which can start-up from Typ. 0.6V.
RICOH RP400xxx1B SERIES HIGH EFFICIENCY SMALL PACKAGES STEP-UP DC/DC CONVERTERS handbook
RP400xxx1B Series high efficiency, small packages, step-up DC/DC converters