diff --git a/README.md b/README.md index dbf69f1..ccfd228 100644 --- a/README.md +++ b/README.md @@ -41,16 +41,18 @@ This driver allows you to: This driver is compatible with the DS3231 and DS3232 I2C devices and the DS3234 SPI device. -### DS3231 -The DS3231 is a low-cost, extremely accurate I2C real-time clock (RTC) with -an integrated temperature-compensated crystal oscillator (TCXO) and crystal. +These devices are low-cost temperature-compensated crystal oscillator (TCXO) +with a very accurate, temperature-compensated, integrated real-time clock +(RTC) including 236/256 bytes of battery-backed SRAM, depending on the model. -The device incorporates a battery input, and maintains accurate timekeeping -when main power to the device is interrupted. The integration of the -crystal resonator enhances the long-term accuracy of the device as well as +### DS3231 and DS3232 details + +The devices incorporate a battery input, and maintain accurate timekeeping +when main power to the devices is interrupted. The integration of the +crystal resonator enhances the long-term accuracy of the devices as well as reduces the piece-part count in a manufacturing line. -The DS3231 is available in commercial and industrial temperature ranges, -and is offered in a 16-pin, 300-mil SO package. +The devices are available in commercial and industrial temperature ranges, +and are offered in a 16-pin, 300-mil SO package. The RTC maintains seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for @@ -66,36 +68,7 @@ reset output, and to automatically switch to the backup supply when necessary. Additionally, the RST pin is monitored as a pushbutton input for generating a μP reset. -### DS3232 -The DS3232 is a low-cost temperature-compensated crystal oscillator (TCXO) -with a very accurate, temperature-compensated, integrated real-time clock -(RTC) and 236 bytes of battery-backed SRAM. - -Additionally, the DS3232 incorporates a battery input and maintains -accurate timekeeping when main power to the device is interrupted. The -integration of the crystal resonator enhances the long-term accuracy of the -device as well as reduces the piece-part count in a manufacturing line. -The DS3232 is available in commercial and industrial temperature ranges, -and is offered in an industry-standard 20-pin, 300-mil SO package. - -The RTC maintains seconds, minutes, hours, day, date, month, and year -information. The date at the end of the month is automatically adjusted for -months with fewer than 31 days, including corrections for leap year. The -clock operates in either the 24-hour or 12-hour format with an AM/PM -indicator. Two programmable time-of-day alarms and a programmable -square-wave output are provided. Address and data are transferred serially -through an I2C bidirectional bus. - -A precision temperature-compensated voltage reference and comparator -circuit monitors the status of VCC to detect power failures, to provide a -reset output, and to automatically switch to the backup supply when -necessary. Additionally, the RST pin is monitored as a pushbutton input for -generating a μP reset. - -### DS3234 -The DS3234 is a low-cost, extremely accurate SPI bus real-time clock (RTC) -with an integrated temperature-compensated crystal oscillator (TCXO) and -crystal. +### DS3234 details The DS3234 incorporates a precision, temperature-compensated voltage reference and comparator circuit to monitor VCC. When VCC drops below the