App note from Holtek on their Real time clock IC HT1382. Link here (PDF) The HT1382 is a low power real time clock device which includes two serial interfaces: I2C or 3-wire. The interface mode is selected by the selected device type. The device provides both clock and calendar information in BCD format and also […]
Tag Archives: real time clock
App note: Intelligent lighting controller measures ambient light and tracks time
Implementation on ambient light and time tracking luminaires controller from MAXIM Integrated, Link here This reference design explains how to design an intelligent lighting controller that senses and measures the ambient light level with an ambient light sensor (ALS). Equipped with a real-time clock (RTC), the controller also knows when to turn lighting on or […]
A look inside the DS3231 real-time clock
Pete posted an article taking a closer look at Maxim’s DS3231 real-time clock: Fortunately, Maxim also offers the DS3231, which is advertised as an “Extremely Accurate I2C-Integrated RTC/TCXO/Crystal”. This chip has the 32kHz crystal integrated into the package itself and uses a built-in temperature sensor to periodically measure the temperature of the crystal and, by […]
Using a $2 DS3231 RTC & AT24C32 EEprom from eBay
From the comments on our ‘Using DS1307 and DS3231 real-time clock modules with Arduino‘ post, Edward Mallon writes: I’ve been putting the $1 DS3231 boards through their paces for quite a while now…and they have been performing well. More details at Edward Mallon’s blog. Via the comments.
App note: Debugging stand-alone real-time clock/calendar-based applications
Here’s an application note from Microchip: Debugging stand-alone real-time clock/calendar-based applications (PDF!) An increasing number of applications require Real-Time Clock/Calendar (RTCC) devices. Microchip’s RTCC’s (I2C™ and SPI) are feature-rich devices that incorporate EEPROM, Time/Date registers, Time-Stamp registers, alarm modules, SRAM, a watchdog timer, and event detect modules, making them useful in many timekeeping applications. This application […]
Modified Arduino DS1307RTC library that also works for MCP7940N
Ray writes, “When your project needs a real-time clock (RTC), don’t you hate that the popular DS1307 costs several dollars? I recently came across Microchip’s MCP7940N, which is an inexpensive alternative to DS1307. On the hardware side it is pretty much a drop-in replacement (although Microchip recommends adding several extra elements). The software requires a […]
Using Bus Pirate to program I2C RTC
@FrozenElecBlog tweeted, “Just published a video about the Bus Pirate — love this thing!!!”
RTCSetup – Real Time Clock setup tool
Chip note: MCP7941X I2C RTCC with EEPROM, SRAM, Unique ID and Battery Switchover
Microchip’s MCP79411 general purpose I2C™Compatible real-time clock/calendar (RTCC) is highly integrated with nonvolatile memory and advanced features including a battery switchover circuit for backup power, a timestamp to log power failures and digital trimming for accuracy. It can use a low-cost 32.768 kHz crystal or other clock source and the chip operates over a supply […]