SX1441EVK Semtech, SX1441EVK Datasheet - Page 13

• Manufacturer Part Number: SX1441EVK
• Description: KIT DEV FOR SX1441
• Manufacturer: Semtech
• Series: EasyBlue™r
• Type: Bluetoothr

Specifications of SX1441EVK

• For Use With/related Products: SX1441
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Contents: -
• Other names: SX1441DVK; SX1441DVK

Personal Area Network
3.3.3 Modes of Operation
The power management unit’s role is to generate regulated voltages for both internal and the external components
such as the non-volatile serial memory and the radio chip. It includes a controller to switch on/off all voltage
regulators when needed in order to reduce power consumption. Three modes of operation are defined (see Figure
6):
© Semtech 2006
Pos
7
6:5
4
3:2
1
0
Pos
7
6
5
4:0
•
•
•
OFF mode: all internal power supplies are shut down. Power consumption is very low, typically a few
micro-amps.
ON mode: all blocks except the CODEC are powered. The application is running and a Bluetooth
connection may be active. The chip enters this state when the WAKEUP input is set high (see Figure 5),
and leaves this mode under software control, when requested by the application. In the ON mode, the pin
VREGD outputs 1.8V and the pin VREGA is floating.
AUDIO mode: all blocks are powered. It is entered upon request from the application. In the AUDIO mode,
the pins VREGA and VREGD output 1.8V.
RegPmgtVregd
WakeUp
-
VregdStatus
TuneVregd
VregdLock
-
RegPmgtEol
EolOk
-
EnableEol
EolThreshold
WAKEUP
OFF
(for ex. Timeout or button)
r
r/w
r
r
rw
w
r
r/w
r
r
rw
rw
Software control
WAKEUP pin
Figure 6 - SX1441 power management modes
Figure 5 - WAKEUP timing diagram
Table 6 - RegPmgtVregd register
t
wakeup
Reset
0
00
1
00
1
0
Reset
x
0
0
00000
Table 7 - RegPmgtEol register
ON
13
Function
value of the wakeup pin
reserved
1 = VREGD voltage regulator switched on
0 = VREGD voltage regulator switched off
adjust VREGD value
1 = lock VREGD voltage regulator
0 = shut down VREGD voltage regulator
reserved
Function
0 = VDDBAT pin voltage < EolThreshold
1 = VDDBAT pin voltage ≥ EolThreshold
reserved
1 = battery end-of-life switched on
0 = battery end-of-life switched off
adjust battery end-of-life comparator threshold
(ex. SCO link activated)
(for ex. SCO link closed)
Software control
Software control
AUDIO
SX1441 – Bluetooth® 1.2 SoC
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Data Sheet