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Square Wave/Output Driver. When enabled, the SQWE bit set to 1, the SQW/OUT pin
outputs one of four square -wave frequencies (1Hz, 4kHz, 8kHz, 32kHz). The SQW/OUT
pin is open drain and requires an external pullup resistor. SQW/OUT operates with either VCC
or V BAT applied. The pullup voltage can be up to 5.5V regardless of the voltage on VCC
. If not used, this pin can be left floating.
Thanks. I will use a pullup register then.Correct.... open drain!