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R4 is the pullup resistor for the SNOOZE pin, therefore, the device operates
in normal mode. Applying a logic low level to the SNOOZE input, programs the
device in snooze mode.
Note:
When the device is in snooze mode, be aware that the LBI and SNOOZE re-
sistors (R1, R2, and R4) draw more current than the device itself. For mea-
suring the low quiescent current in this mode, these three resistors must be
removed.
For operation with the internal oscillator, connect the SNOOZE signal to either
the input voltage (like on the EVM) or a logic high level respectively, or to a low-
level for operation in snooze mode. The device can also be synchronized with
an external oscillator signal. For synchronization to an external oscillator sig-
nal, the SNOOZE pin must be connected to this signal. When the internal logic
detects an external clock signal, the device is synchronized to this clock and
the internal clock is turned off. For the appropriate frequency and levels,
please refer to the TPS6021x data sheet (literature number SLVS296).
Schematic of the EVM
Physical Data and Setup of the EVM
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