Data Sheet
Table Of Contents
- 1 Description
- 2 RoHS compliance
- 3 Applications
- 4 Software architecture
- 5 Hardware specifications
- 6 Hardware block diagram
- 7 Hardware design
- 8 Regulatory compliance
- 9 Ordering information
- 10 Revision history
Hardware design SPBT2632C2A
20/27 Doc ID 022833 Rev 4
7.6 External LPO input circuit
An optional low power oscillator input may be added to allow Deep sleep and Sniff modes.
● LPO parameters:
– Frequency: 32.768 kHz
– Tolerance: 150 ppm
– Voltage levels
–Low: 0.5 V
– High: 1.8 V
– Input capacitance: 2.5 pF maximum
● Configurations:
– Use two configuration variables: UseExtLPO and AllowSniff.
Figure 11. External LPO circuit
Table 9. System configuration variables
Variable Name Default Description
Var37 UseExtLPO True
True when a 32.768 kHz low power oscillator is present, and false
if not present
Var43 AllowSniff True Enables Sniff mode.
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