Data Sheet

Preliminary Specification Number : SP-ZZ1PJ-331-K
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Preliminary & Confidential
< Specification may be changed by Murata without notice >
Murata(China) Investment Co., Ltd.
11. External low–power 32.768 kHz clock
The 32 kHz clock is used in low-power modes such as IEEE power-save and sleep. It serves as a timer
to determine when to wake up to receive beacons in various power-save schemes and to maintain
basic logic operations when in sleep.
Type1PJ module does not require an external 32 kHz clock. By default, Type1PJ module utilizes its
internal 200 kHz clock shared with the WLAN and BT subsystem.
If the end application has a more accurate 32 kHz clock, then it can be supplied externally via the
LF_CLK_IN pin. The LF_CLK_IN pin must be grounded when using the default internal clock mode. If
an external 32 kHz clock is used, the requirements are: