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RTCC family touts smaller size

Posted: 16 Aug 2012     Print Version  Bookmark and Share

Keywords:RTCC  real-time clock  calendar  timekeeping 

Microchip Technology Inc. expands its stand-alone Real-Time Clock/Calendar (RTCC) offerings with the introduction of the 10-pin, SPI MCP795XX family which offers many of the features of the company's larger 14-pin MCP795WXX family of RTCCs.

SPI Real-Time clock

The RTCCs are said to be suited for the handheld, wireless and consumer markets because they reduce component count and cut the costs of user programming for a serial ID. They include 64B of SRAM, 2Kbits of EEPROM and a 128bit Unique ID, which can be ordered blank or pre-programmed with a MAC address, extra memory devices may not be needed. They are also suitable for utility power meters, manufacturing equipment, radios, GPS and hospital instrumentation applications that need accurate time over a broad temperature range will also benefit from the very wide digital trimming range, which can compensate up to 22seconds per day for crystal frequency drift.

Digital trimming improves the timekeeping accuracy of RTCCs, and a wide digital trimming range provides customers with high accuracy over a large temperature range. Accurate timekeeping is also supported at a decreased power-consumption level, because digital trimming is maintained when the MCP795XX is operating from backup power on the VBAT input. Additionally, these devices join the industry's only portfolio to distinctively offer a battery-backed RTCC with both power-fail and power-restore timestamps plus three types of non-volatile memory: EEPROM, SRAM and a Unique ID.

When the time and duration of power failures need to be logged, the MCP795XX family can accomplish this without adding any circuitry by using the on-chip power-fail timestamp feature, which is not offered by any other SPI RTCC on the market. With long battery life at a premium, applications such as wireless, portable communications, security and automotive can benefit from the 5MHz SPI bus and millisecond alarm. This high-resolution alarm output provides a greater degree of control over the duty cycle needed to support longer MCU sleep and power-down modes.

The MCP795XX SPI RTCC PICtail Plus Daughter Board (part # AC164147, Rs.2,459.02 ($45)) is expected to be available in August. This board works with Microchip's Explorer 16 Development Board (part # DM240001, Rs.7,103.28 ($129.99)) and PIC18 Explorer Board (part # DM183032, Rs.5,463.93 ($99.99)) to enable designers to demonstrate the MCP795XX and WXX RTCC devices in their applications.

The MCP795XX family includes the MCP79510, MCP79511, MCP79512, MCP79520, MCP79521 and MCP79522 RTCCs. All are available for sampling now in 10-pin MSOP and TDFN packages. Prices start at Rs.42.62 ($0.78) each in 10,000-unit quantities, and volume-production is expected to begin in October.

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