More specifically, the functions of the RL78I1D are optimized for detectors that have minimal variations in sensor output used for monitoring smoke, gas, and motion or vibrations.
The ability to utilize functions such as Data Transfer Control (DTC), Event Link Control (ELC), and Data Operation Circuitry (DOC) to perform data processing and transfer, and to implement long-interval timings, all without CPU intervention, contributes to a further reduction in power consumption during intermittent system operations of approximately 30%. In low-power operating mode, the RL78I1D group has a significantly lower current consumption level than competing products and wakes up from standby mode very quickly. This microcontroller alone can make a substantial contribution to the overall energy efficiency of the system.
To help reduce cost and enable a more compact system, the new RL78/I1D group integrates general-purpose differential operational amplifier inputs, a 12-bit A/D converter, and a comparator. This entire assembly allows a single chip to house peripherals with the analog functions required to interface with sensors.
Main features of the RL78/I1D Microcontroller Group:
1) The innovative "Snooze" mode function enables data processing and transfer without CPU intervention.
The Data Transfer Controller (DTC) or Event Link Controller (ELC) can be used to activate sensors, trigger operational amplifiers to amplify the sensor signal, and transfer the A/D conversion results. The Data Operation Circuit (DOC) compares the transferred A/D conversion results and the threshold value to determine whether the CPU should be activated. These innovative "Snooze" mode functions operate without CPU intervention in standby mode and reduce power consumption by approximately 30% in applications such as fire detectors, gas detectors, glass break detectors, and security systems (human sensors).
2) Dynamic switching of operating mode to match the system state.
The RL78/I1D group allows dynamic switching between low-power and high-speed operating modes to match the required system state. In low-power mode, with a power supply between 1.8V ≤ VDD ≤ 3.6V and a frequency of 1 MHz, current consumption is only 124 μA (typ.), significantly lower than competing products. Furthermore, it starts from standby mode in only 4 μs (max.). This reduces power consumption during startup and allows the microcontroller to contribute to the overall energy efficiency of the system.
3) On-chip analog peripherals, necessary for detailed sensor signal detection.
Depending on the package, there are four differential operational amplifier inputs, each with two input pins and one output pin, up to 17 channels of A/D converters, and two analog comparators. By combining the analog functions required for applications such as fire detectors, gas detectors, glass break detectors, and security systems onto a single chip, the RL78/I1D group significantly contributes to reducing system costs due to its more compact design.
Availability:
The RL78/I1D group comprises 13 product versions with packages ranging from 20 to 48 pins and integrated flash capacities of 8, 16, and 32 kilobytes (KB).
Production has already begun, and a combined volume of 400,000 units per month is expected by December 2015. (Availability is subject to change without notice.)
