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Document MAX31328.

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@ -23,7 +23,7 @@ Please also see the [official examples](https://github.com/micropython/micropyth
2.1 [ESP32](./README.md#21-esp32) Pinout and notes on the reference board 2.1 [ESP32](./README.md#21-esp32) Pinout and notes on the reference board
2.2 [SSD1306](./README.md#22-ssd1306) Write large fonts to the SSD1306. 2.2 [SSD1306](./README.md#22-ssd1306) Write large fonts to the SSD1306.
2.3 [Pyboard D](./README.md#23-pyboard-d) Some information remains absent or hard to find in the docs. 2.3 [Pyboard D](./README.md#23-pyboard-d) Some information remains absent or hard to find in the docs.
2.4 [DS3231 precision RTC](./README.md#24-ds3231-precision-rtc) Use cheap hardware to calibrate Pyboard RTC. 2.4 [DS3231 MAX31328 precision RTC](./README.md#24-ds3231-max31328-precision-rtc) Use cheap hardware to calibrate Pyboard RTC.
3. [Essays](./README.md#3-essays) General thoughts. 3. [Essays](./README.md#3-essays) General thoughts.
3.1 [Resilient](./README.md#31-resilient) A guide to writing resilient WiFi code 3.1 [Resilient](./README.md#31-resilient) A guide to writing resilient WiFi code
3.2 [Serialisation](./README.md#32-serialisation) Review of MicroPython's five serialisation libraries 3.2 [Serialisation](./README.md#32-serialisation) Review of MicroPython's five serialisation libraries
@ -125,12 +125,15 @@ be found as part of [this repository](https://github.com/peterhinch/micropython-
Assorted [information](./pyboard_d/README.md) not yet in the official docs or Assorted [information](./pyboard_d/README.md) not yet in the official docs or
hard to find. hard to find.
## 2.4 DS3231 precision RTC ## 2.4 DS3231 MAX31328 precision RTC
This is a low cost precision battery backed real time clock (RTC) accurate to This is a low cost precision battery backed real time clock (RTC) accurate to
+-2 minutes/year. Two drivers are provided, one portable across platforms and +-2 minutes/year. Two drivers are provided, one portable across platforms and
one which is Pyboard specific. one which is Pyboard specific.
This driver also supports the MAX31328 which is a 100% compatible chip from the
same manufacturer.
The Pyboard-specific driver provides a facility to calibrate the Pyboard's RTC The Pyboard-specific driver provides a facility to calibrate the Pyboard's RTC
from the DS3231. Calibration to high precision may be achieved in five minutes. from the DS3231. Calibration to high precision may be achieved in five minutes.