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Date: 24-01-15

Low power MCUs RL78/I1D from Renesas

Renesas Electronics' New Microcontroller RL78/I1D Consume very low power when operating at 1 MHz. The RL78/I1D functions are optimized for detectors that sense minute variations in the output of sensors used to monitor for smoke, gas, and motion or vibrations.

The functions such as the data transfer controller (DTC), event link controller (ELC), and data operation circuit (DOC) and long-interval timers all done without the need of CPU, which has resulted in low-power consumption by approximately 30 percent. RL78/I1D consumes a operating current level much lower than that of competing products, and it wakes up from the stop-mode state very quickly, claims Renesas.

Key Features of RL78/I1D Group of MCUs as explained by Renesas :

(1) Innovative snooze mode functions enabling data processing and transfer without CPU intervention
The data transfer controller (DTC) or event link controller (ELC) can be used to activate sensors, activate operational amplifiers to amplify sensor signals, and transfer A/D conversion results. The data operation circuit (DOC) compares the transferred A/D conversion results and threshold values to determine whether the CPU needs to be activated. These innovative snooze mode functions operate without CPU intervention in standby mode and reduce power consumption by approximately 30 percent in products such as fire detectors, gas detectors, broken glass detectors, and security systems (human sensors).
(2) Dynamic switching of the operation mode to match the system status
The RL78/I1D Group allows dynamic switching between low-power operation mode and high-speed operation mode to match the system status. In low-power operation mode with a power supply voltage of 1.8 V ≤ VDD ≤ 3.6 V and an operating frequency of 1 MHz, the operating current is only 124 μA (typ.), far lower than competing products. In addition, wake-up from the stop-mode state occurs in just 4 μs (max.) when the medium-speed on-chip oscillator clock (4 MHz) is used as the main system clock. This cuts power consumption during wake-up and enables the microcontroller on its own to contribute to the overall power efficiency of the system.
(3) On-chip analog peripheral functions necessary for detecting minute sensor signals
Depending on the package, there are four differential input operational amplifiers, each with two input pins and one output pin, up to seventeen channels for the A/D converter and two analog comparators. By bringing together on a single chip the analog functions required by applications such as fire detectors, gas detectors, broken glass detectors, and security systems, the RL78/I1D Group greatly contributes to lower system cost and greater compactness.

Availability: The RL78/I1D Group comprises 13 product versions with package pin counts ranging from 20 to 48 pins and on-chip flash memory capacities of 8, 16, and 32 kilobytes (KB). Mass production has already begun and is expected to reach a combined volume of 400,000 units per month by December 2015.

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