LMX9830SM National Semiconductor, LMX9830SM Datasheet - Page 30

• Manufacturer Part Number: LMX9830SM
• Manufacturer: National Semiconductor

Specifications of LMX9830SM

• Lead Free Status / Rohs Status: Not Compliant

www.national.com
12.0 Low Power Modes
The LMX9830 supports different Low Power Modes to reduce
power in different operating situations. The modular structure
of the LMX9830 allows the firmware to power down unused
modules.
The Low power modes have influence on:
•
•
12.1 POWER MODES
The following LMX9830 power modes, which depend on the
activity level of the UART transport layer and the radio activity
are defined:
UART transport layer
– enabling or disabling the interface
Bluetooth Baseband activity
– firmware disables LLC and Radio if possible
Power
Mode
PM0
PM1
PM2
PM3
PM4
PM5
FIGURE 13. Transition between different Hardware Power Modes
Activity
UART
OFF
OFF
OFF
ON
ON
ON
TABLE 23. Power Mode Activity
OFF
OFF
Scanning
Scanning
SPP Link
SPP Link
30
The radio activity level mainly depends on application re-
quirements and is defined by standard bluetooth operations
like inquiry/page scanning or an active link.
A remote device establishing or disconnecting a link may also
indirectly change the radio activity level.
The UART transport layer by default is enabled on device
power up. In order to disable the transport layer the command
“Disable Transport Layer” is used. Thus only the Host side
command interface can disable the transport layer. Enabling
the transport layer is controlled by the HW Wakeup signalling.
This can be done from either the Host or the LMX9830. See
also “LMX9830 Software User’s Guide” for detailed informa-
tion on timing and implementation requirements.
Activity
Radio
none
Main Clock
Main Clock / 32.768 kHz
Main Clock
Main Clock
Main Clock
Reference
Clock
20180021