sx1441 Semtech Corporation, sx1441 Datasheet - Page 15

• Manufacturer Part Number: sx1441
• Description: Bluetooth V1.2 Soc For Voice And Data Applications With Dsp Capabilities
• Manufacturer: Semtech Corporation

Personal Area Network
VDD_M should be decoupled with a capacitor C
external capacitor C
connected to an external capacitor C
VREF is connected to an external capacitor C
3.3.5 Regulators Specifications, External Components
Note : Values above are specified across temperature range and for VDD_M > 2.2V unless otherwise specified
Capacitors should be added to decouple VDD_PA, VDD_DIG, VDD_ANA, VDDIO, and VDDIO_DIG, as a common
practice.
3.3.6 Battery End-Of-Life (EOL)
The battery end-of-life circuit structure is described in Figure 8. A voltage is created by drawing a constant current
I
of the register RegPmgtEol is directly the output of the comparator. The EolOk is set to “1” whenever the voltage
at VDDBAT is higher or equal to the threshold voltage V
given by the Equation 1. For cThe start up time of the end-of-life circuit is T
on VDDBAT is T
© Semtech 2006
eol
Symbol
C
C
C
C
from the pin VDDBAT through the internal resistor R, and is compared with a voltage reference. The bit EolOk
VREGD
VREGA
VREF
VDD_M
Symbol
V
V
I
I
REGA
REGD
REGD
REGA
EOLres
Analog regulated output
voltage
Digital regulated output
voltage
Output current on VREGA
Output current on VREGD
VREGD
.
Description
to insure the stability and the performance of the voltage regulator. VREGA has to be
V
EOLThresho
Equation 1 - Threshold voltage of the EOL comparator
VDDBAT
Table 8 - On-chip voltage regulators specifications
ld
VREGA
Table 9 - Typical external components
Figure 8 - Battery end-of-life structure
=
V
EOLref
to insure the stability and the performance of the voltage regulator.
I
VREF
eol
V1
1.62
Min
1.62
VDD_M
. VDD_PA can be connected to VREGD.
+
V
EOLstep
for best performances. VREGD has to be connected to an
15
Value
4.7 uF
1 uF
1 uF
1 uF
Typ
1.8
EOLThreshold
1.8
⋅
0.7V
∑
i
=
4
0
2
i
⋅
. This threshold voltage of the comparator is
EolThresho
Max
1.98
1.98
10
50
EolOk
EOLstart
V
Unit
mA
mA
V
ld
SX1441 – Bluetooth® 1.2 SoC
. The response time to a change
] [
i
I_load=1mA
I_load=50mA
Recommended max. load
Recommended max. load
Comments
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