|Item model number||SL018|
|Item Weight||1.58 ounces|
|Product Dimensions||1.18 x 4.72 x 3.94 inches|
|Item Dimensions L x W x H||1.18 x 4.72 x 3.94 inches|
BanKhok Holdding DS3231 AT24C32 IIC Module Precision Real Time Clock Memory Module with a Temperature-Compensated Crystal Oscillator For Arduino
We don't know when or if this item will be back in stock.
- Make sure this fits by entering your model number.
- DS3231 is a low-cost, high-precision I2C real-time clock (RTC) with integrated temperature-compensated crystal oscillator (TCXO) and crystal. The integrated crystal oscillator improves the long-term accuracy of the device and reduces the number of components in the production line.
- The module contains a battery input, which can maintain accurate timing when the main power is disconnected. RTC saves seconds, minutes, hours, day, date, month, and year information. Months less than 31 days will automatically adjust the end of the month, including corrections for leap years. The working format of the clock can be 24 hours or a 12-hour format with / AM / PM indication.
- Provide two configurable calendar alarms and a configurable square wave output. The address and data are transferred serially through the I2C bidirectional bus.
- Precise, temperature-compensated voltage reference and comparator circuits are used to monitor VCC status, detect power failures, provide reset output, and automatically switch to backup power when necessary. In addition, the / RST monitor pin can be used as a manual input to generate a μP reset.
- A very accurate digital temperature sensor is integrated inside, which can be accessed through the I2C * interface (just like time).
Customers who viewed this item also viewed
What other items do customers buy after viewing this item?
Customers who bought this item also bought
Have a question?
Find answers in product info, Q&As, reviews
Your question may be answered by sellers, manufacturers, or customers who purchased this item, who are all part of the Amazon community.
Please make sure that you are posting in the form of a question.
Please enter a question.
Specification:Size: 38 x 22 x 14mmWeight: 8gTemperature accuracy: 3 CMaximum transmission speed: 400KHz (working voltage of 5V) Feature:Low-cost, accurate I2C real-time clock (RTC) module with a temperature-compensated crystal oscillator (TCXO) improving long-term accuracyPrecise temperature sensor, through the I2C interface for accessRechargeable battery LIR2032, maintaining accurate timekeeping without main powerAutomatically adjusted including corrections for leap yearCalendar alarm clock with two programmable square-wave outputGenerating seconds, minutes, hours, day, month and year timing till 2100Cascaded with other IIC device, 24C32 addresses can be shorted A0/A1/A2 modify default address is 0x57Rechargeable battery LIR2032, preventing the system from power failure Wiring instructions (with Arduino uno r3 for example):SCL?A5SDA?A4VCC?5VGND?GND Package included:1x DS3231 AT24C32 IIC module
There was a problem filtering reviews right now. Please try again later.
Depending on the vendor or their source, they’re shipped either with:
1. A primary (non-rechargeable) 3V Lithium coin cell (CR2032)
2. A rechargeable 3.6V Li-Ion coin cell (LIR2032)
In all cases, the module has a charging circuit that continuously charges (or tries to) whatever coin cell is installed.
In the case of the CR2032, that’s problematic, as charging a primary Lithium battery may lead to catastrophic failure.
In the case of the LIR2032, it’s under a continuous & unregulated charging current. also problematic.
What I do:
If I get a LIR2032, I replace it with a CR2032, which should last several years in standby.
In either case, I always remove (desolder) the charging circuit’s surface-mount resistor,
marked “201” (ie. 200 Ohms), located right above the silkscreened “SCL”, thus disabling charging.
You can also cut the trace coming down from the resistor if you don’t have a soldering iron.
Google “ZS-042” for more info from many sources regarding this issue.
Apart from that fairly serious design flaw,
I’ve found the Dallas Maxim DS3231 chip to hold time amazingly precisely, thanks to its internal temperature-compensated crystal.
As a side effect, you can retrieve its ambient temperature from its registers.
The added Atmel AT24C32 on the module provides 4K Bytes of EEPROM, perfect if you need a little additional storage.
Tested at both 5V and 3.3V with no difference.
BTW, these came with rechargeable batteries.
I also have to mention, I have another DS3231 which works just fine. It's not the chip, but other components that are messing with the accuracy.
EDIT: Upon buying a different DS3231 (from a different seller), which was also the M variety, I have reached the conclusion that my modual was faulty. It was getting an error of about 2 minutes behind every day, which is well in excess of what even the worst case DS3231M should do. So yeah. Don't buy from this seller.
Otherwise, this module works fine.