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User’s Manual 233
16.7 Sleepy Mode Current Consumption
In sleepy mode the unit operates from the 32.768 kHz clock, which may be divided down
to as slow as 2.048 kHz. The current consumption is given by:
I
total
(µA) = 0.32 × V × f + 0.23 × V
c
× f + 5 × V
c
where f is in kHz, V is the operating voltage, and V
c
= V × [(V/2) - 0.7].
Leakage, the standby current of the reset generator, the current consumption of the oscilla-
tor and the real-time clock, and the current consumption of memories must be added to the
sleepy mode current consumption. Generally the self-timed chip select mode is used to
reduce memory current consumption.