DESCRIPTION

Raspberry Pi 40-pin <b>RTC-SHIM</b> mini-HAT.<br/>
Features:
<ul>
<li>DS3231 RTC chip</li>
<li>double footprint for larger and smaller versions of the chip</li>
<li>CR1220 3V battery</li>
<li>locked Pi headers</li>
<li>double set of Pi headers (for inside and outside mount)</li>
<li>I2C0/I2C1 bus selection</li>
<li>can be used as SHIM (no headers) or HAT (with headers)</li>
<li>optional external notebook BIOS battery connector</li>
</ul>

Raspberry Pi <b>RTC-mini-flip-SHIM</b> micro-HAT.<br/>
Features:
<ul>
<li>DS3231 RTC chip</li>
<li>double footprint for larger and smaller versions of the chip</li>
<li>CR1220 3V battery</li>
<li>locked Pi headers</li>
<li>double mount on Pi headers (for inside and outside mount)</li>
<li>very small size</li>
<li>fits on 26- and 40-pin Pi headers</li>
<li>optional external notebook BIOS battery connector (both side mount possible)</li>
</ul>

Raspberry Pi zero 40-pin <b>RTC-zero-SHIM</b> mini-HAT.<br/>
Features:
<ul>
<li>DS3231 RTC chip</li>
<li>double footprint for larger and smaller versions of the chip</li>
<li>CR2032/CR1220 3V battery</li>
<li>locked Pi headers</li>
<li>Pi zero board style</li>
<li>I2C0/I2C1 bus selection</li>
<li>can be used as SHIM (no headers) or HAT (with headers)</li>
<li>optional external notebook BIOS battery connector</li>
</ul>