Infineon has introduced a new family of highly-integrated transmitter ICs for wireless control applications. All members of the new SmartLEWIS MCU PMA71xx family include an ASK/FSK multiband transmitter for the sub-1 GHz ISM frequency bands, with an 8051 microcontroller enhanced with specific embedded mixed-signal peripherals.
With the SmartLEWIS MCU family inside, remote controls are able to use radio frequency (RF) technology instead of today’s infrared (IR) transmission, overcoming the disadvantage of line-of-sight communication. In addition, RF-based applications benefit from an extended range of more than 50 metres, compared to only a few metres for IR technology. The PMA71xx products are multiband transmitters, covering four ISM frequency bands (315 MHz, 434 MHz, 868 MHz and 915 MHz) on a single chip.
In addition to an 8051 microcontroller with 6 KBytes of Flash memory and 10 GPIOs, all members of the SmartLEWIS family integrate an RF transmitter consisting of an integer-N PLL synthesiser and a high-efficiency power amplifier with selectable output power.
The embedded multichannel 10-bit ADC includes flexible high-gain settings and can be used as an interface for a broad variety of analog sensors, such as pressure, temperature and humidity sensors. The integrated 125 kHz low-frequency (LF) receiver enables wireless wake-up in battery-operated applications and contactless device configuration. The family’s peripherals include a data format encoder/decoder, a 16-bit CRC generator/checker, a pseudo random number generator, and several timers. An associated firmware function library provides powerful functions, such as AES encryption. This firmware is located in an on-chip ROM saving valuable flash memory.
All family members are designed for low current consumption – with a typical value of only 500 nA in power-down mode - and include an advanced power control system to preserve the life of a battery. The operating temperature range is in accordance with industrial market requirements from -40°C to +85°C.
The SmartLEWIS MCU family today includes four products. Each product is designed particularly for wireless control applications, such as home automation, security and alarm systems, home entertainment products and automatic meter reading systems.
The PMA7105 was developed for use in RF remote controls and digital sensor-based systems. The PMA7106 targets wireless sensor applications using analog sensors connected to an extra 3-channel 10-bit ADC with flexible gain settings and differential inputs. For applications requiring wireless wake-up or contactless device configuration such as active tagging, the PMA7107 features an additional 125 kHz LF receiver. The highest-integrated product of the family is the PMA7110 developed for use in sophisticated wireless systems that require a 10-bit ADC and LF receiver.
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