Data Sheet

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11
3.3. PCB Layout Guidelines
3.4. External LPO Input Circuit
An external source may optionally supply the slow clock to the LPO pin when using PN: BLE60/BLE63.
This clock is already supplied on the module with PN: BLE60/BLE63_LP, and no additional circuitry is
needed. The source must be a digital signal in the range of 0.1V to Vcc. The accuracy of the slow clock
frequency must be 32.768 KHz ±100 ppm.
3.4.1. Low power circuit requirements
Module part number
Low power usage
External LPO circuit required
BLE60/BLE63
No
Not required
BLE60/BLE63
Yes
Required
BLE60/BLE63_LP
Yes or no
Not required