P2110B
915 MHz RF Powerharvester
erharvester® Receiver
DESCRIPTION
APPLICATIONS
The Powercast P2110B Powerharvester
Powerharvester is
an RF energy harvesting device that converts
RF to DC. Housed in a compact SMD
package, the P2110B receiver provides RF
energy harvesting and power management
for battery-free, micro-power
power devices. The
P2110B converts RF energy to DC and stores
it in a capacitor. When a charge threshold on
the capacitor is achieved, the P2110B boosts
the voltage to the set output voltage level
and enables the voltage output. When the
charge on the capacitor declines to the low
voltage threshold the voltage output is
turned off. A microprocessor can be used to
optimize the power usage from the P211
P2110B
and obtain other data from the component
for improving overall system operation.
Battery-free
free wireless sensors
- Industrial Monitoring
- Smart Grid
- Defense
- Building automation
- Oil & Gas
Battery recharging
-Coin cells
-Thin-film cells
Low power electronics
FUNCTIONAL BLOCK DIAGRAM
FEATURES
High conversion efficiency
Converts low-level
level RF signals enabling
long range applications
Regulated voltage output up to 5.
5.5V
Up to 50mA output current
Received signal strength indicator
No external RF components required –
Internally matched to 50 ohms
Wide RF operating range
Operation down to -12 dBm input power
Externally resettable for microprocessor
control
Industrial temperature range
RoHS compliant
PIN CONFIGURATION
TOP VIEW
Powercast products and technology are covered by one or more of the following patents and other patents pending:
6,289,237 | 6,615,074 | 6,856,291 | 7,027,311 | 7,057,514 | 7,639,994 | 7,643,312 | 7,812,771 | 7,844,306 | 7,868,482 | 7,898,105 | 7,925,308 | 8,159,090 | 8,380,255
8,432,062 | 8,461,817 | 8,621,245
2016/12
© 2016 Powercast Corporation, All rights reserved.
www.powercastco.com / contact@powercastco.com
+1 (412) 455-5800
Page 1
P2110B
915 MHz RF Powerharvester® Receiver
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Parameter
Rating
Unit
RF Input Power
23
dBm
RFIN to GND
0
V
DSET to GND
6
V
RESET to GND
6
V
VCAP to GND
2.3
V
VOUT to GND
6
V
VOUT Current
100
mA
Operating Temperature Range
-40 to 85
°C
Storage Temperature Range
-40 to 140
°C
Exceeding the
absolute maximum
ratings may cause
permanent
damage to the
device.
ESD CAUTION
This is an ESD (electrostatic discharge) sensitive device. Proper ESD
precautions should be taken to avoid degradation or damage to the
component.
PIN FUNCTIONAL DESCRIPTIONS
Pin
1
2
3
Label
NC
GND
RFIN
4
5
GND
DSET
6
7
INT
RESET
8
9
10
VCAP
NC
VSET
11
12
GND
VOUT
13
DOUT
14
NC
2016/12
Function
No Connection.
RF Ground. Connect to analog ground plane.
RF Input. Connect to 50Ω antenna through a 50Ω transmission line. Add
a DC block if antenna is a DC short.
RF Ground. Connect to analog ground plane.
Digital Input. Set to enable measurement of harvested power. If this
function is not desired leave NC.
Digital Output. Indicates that voltage is present at VOUT.
Digital Input. Set to disable VOUT. If this function is not desired leave NC.
Connect to an external capacitor for energy storage.
No Connection.
Output Voltage Adjustment. Sets the output voltage by connecting a
resistor to VOUT or GND. Leave NC for 3.3V.
DC Ground. Connect to analog ground plane.
DC Output. Connect to external device. The output is preset to 3.3V but
can be adjusted with an external resistor.
Analog Output. Provides an analog voltage level corresponding to the
harvested power.
No Connection.
© 2016 Powercast Corporation, All rights reserved.
www.powercastco.com / contact@powercastco.com
+1 (412) 455-5800
Page 2
P2110B
915 MHz RF Powerharvester® Receiver
SPECIFICATIONS
TA = 25°C, RFIN = 915MHz unless otherwise noted.
Parameter
Symbol
Condition
1
RF Characteristics
Input Power
RFIN
Frequency
DC Characteristics
Output Voltage
VOUT
Output Current
IOUT
VCAP Maximum
VMAX
VCAP Minimum
VMIN
Signal Strength
DOUT
RFIN = 0dBm
Boost Efficiency
IOUT = 20mA
Maximum INT Current
Digital Characteristics
RESET Input High
DSET Input High
INT Output High
Timing Characteristics
DSET Delay
RESET Delay
RESET Pulse Width
1
Min
Typ
-12
902
2.0
3.3
Max
Unit
10
928
dBm
MHz
5.5
50
V
mA
V
V
mV
%
mA
1.25
1.02
275
85
0.1
1
1.8
VMIN
VMAX
50
6.6
20
V
V
V
s
s
ns
See typical performance graphs for operation at other frequencies or power levels.
TIMING DIAGRAM
2016/12
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www.powercastco.com / contact@powercastco.com
+1 (412) 455-5800
Page 3
P2110B
915 MHz RF Powerharvester® Receiver
FUNCTIONAL DESCRIPTION
RF INPUT (RFIN)
The RF input is an unbalanced input from
the antenna. Any standard or custom
50antenna may be used with the
receiver. The P2110B has been optimized
for operation in the 902-928MHz band but
will operate outside this band with reduced
efficiency. Contact Powercast for custom
frequency requirements.
The RF input must be isolated from ground.
For antennas that are a DC short, a high-Q
DC blocking capacitor should be added in
series with the antenna.
STORAGE CAPACITOR SELECTION (VCAP)
The P2110B requires an external storage
capacitor connected at VCAP. The value of
the capacitor will determine the amount of
energy available from the VOUT pin. The
capacitor should have a leakage current as
small as possible. It is recommended that
the leakage current of the capacitor be less
than 1μA at 1.2V. The capacitor ESR should
be 200mor less.
Smaller capacitors will charge more quickly
but will result in shorter operation cycles.
Larger capacitors will charge more slowly,
but will provide for longer operation cycles.
The minimum required capacitor value can
be estimated using the following equation.
= 15
Where,
- Output voltage
- Average output current
- On-time of the output voltage
2016/12
When using the RESET function, the size of
the capacitor is less important. A larger
capacitor can be used to facilitate
intermittent functions that require more
energy. The RESET will control the amount
of energy removed from the capacitor
during operation which will minimize the
required recharge time. It should be noted
that when RESET is used, a larger capacitor
will not affect charge time during operation,
but it will require more time to initially
charge from a completely discharged state.
The voltage on the VCAP pin under normal
operation will vary between approximately
1.25V and 1.02V. If the harvested energy
becomes too large, the voltage on the
capacitor will be internally clamped to
protect low voltage supercapacitors.
Clamping will begin at approximately 1.8V
and will limit the voltage to less than 2.3V
at the maximum rated input power.
RSSI OPERATION (DOUT, DSET)
The RSSI functionality allows the sampling
of the received signal to provide an
indication of the amount of energy being
harvested. When DSET is driven high the
harvested DC power will be directed to an
internal
sense
resistor,
and
the
corresponding voltage will be provided to
the DOUT pin. The voltage on the DOUT pin can
be read after a 50μs settling time.
When the RSSI functionality is being used,
the harvested DC power is not being stored.
© 2016 Powercast Corporation, All rights reserved.
www.powercastco.com / contact@powercastco.com
+1 (412) 455-5800
Page 4
P2110B
915 MHz RF Powerharvester® Receiver
If the RSSI functionality is not used, DOUT
and DSET should be left unconnected. DSET is
internally pulled down.
If the RESET functionality is not used, RESET
should be left unconnected. RESET in
internally pulled down
DATA RETRIEVAL (DOUT, DSET)
Using DOUT and DSET it is possible to collect
data from the RF transmitter that is
supplying power to the P2110B.
As
discussed above, with DSET high, DOUT will
provide a voltage across R3 that can be read
by an ADC. However, the voltage on DOUT
will also follow the power level of the RF
field as the power level changes. If the RF
field is being provided by a transmitter that
is also communicating by modulating its
amplitude, such as the Powercast TX915013W-ID Powercaster® transmitter, the data
can be read by the P2110B. The voltage
level will need gained up using operation
amplifiers and supplied to a device that can
read the data pattern supplied by the
transmitter.
INTERRUPT (INT)
The interrupt function provides a digital
indication that voltage (or current) is
present at the VOUT pin. INT can be used in
more sophisticated systems that contain
other storage elements and can be used as
an external interrupt to bring a device such
as microcontroller out of a deep sleep
mode. The digital high level of the INT pin
will be between VMIN and VMAX. The INT pin
can provide a maximum of 0.1mA of
current.
RESET
The RESET function allows the voltage from
VOUT to be turned off before the storage
capacitor reaches the lower threshold, VMIN,
thereby saving energy and improving the
recharge time back to the activation
threshold, VMAX. The RESET function can be
implemented by a microcontroller. When
the function of the microcontroller is
completed, driving RESET high will disable
the voltage from VOUT. Care should be taken
to ensure that the microcontroller,
especially during power-on, does not
inadvertently drive RESET high. This will
immediately shutdown the output voltage.
2016/12
If the INT functionality is not used, INT
should be left unconnected.
SETTING THE OUTPUT VOLTAGE (VOUT)
The DC output voltage from the P2110 is
preset to 3.3V. However, it can be adjusted
by adding an external resistor to increase or
decrease the output voltage using the
following equations. ( = 10 )
To decrease the output voltage, place a
resistor calculated by the following
equation from VSET to VOUT. The voltage
can be set to a minimum of 2.0V.
=
© 2016 Powercast Corporation, All rights reserved.
www.powercastco.com / contact@powercastco.com
1
(
− 1.21)
(3.32 −
)
+1 (412) 455-5800
Page 5
P2110B
915 MHz RF Powerharvester® Receiver
To increase the output voltage, place a
resistor calculated by the following
equation from VSET to GND. The voltage
can be set to a maximum of 5.5V.
=
(
1.21
− 3.32)
LAYOUT CONSIDERATIONS
The RFIN feed line should be designed as a
50Ω trace and should be as short as
possible to minimize feed line losses. The
following table provides recommended
dimensions for 50Ω feed lines (CPWG) for
different circuit board configurations.
PCB Side View
Material
FR4
(εr = 4.2)
FR4
(εr = 4.2)
Thickness
(H)
62
Trace Width
(S)
50
Spacing
(W)
9
31
50
20
The GND pins on each side of the RFIN pin
should be connected to the PCB ground
plane through a via located next to the pads
under the receiver.
When setting the output voltage, the
resistor connected to the VSET pin should
be as close as possible to the pin. No
external capacitance should be added to
this pin.
The DOUT pin can contain low-level analog
voltage signals. If a long trace is connected
to this pin, additional filtering capacitance
next to the A/D converter may be required.
Additional capacitance on this pin will
increase the DSET delay time.
The trace from VCAP to the storage
capacitor should be as short as possible and
have a width of greater than 20mils to
minimize the series resistance of the trace.
*All dimensions are in mils.
2016/12
© 2016 Powercast Corporation, All rights reserved.
www.powercastco.com / contact@powercastco.com
+1 (412) 455-5800
Page 6
P2110B
915 MHz RF Powerharvester
erharvester® Receiver
TYPICAL PERFORMANCE GRAPHS
2016/12
TA = 25°C, VOUT = 3.3V, VCAP = 1.2V, unless otherwise noted
Powerharvester Efficiency
vs. RFIN (dBm)
Powerharvester Efficiency
vs. RFIN (mW)
Powerharvester Efficiency
vs. Frequency
Powerharvester Efficiency
vs. Frequency
© 2016 Powercast Corporation, All rights reserved.
www.powercastco.com / contact@powercastco.com
+1 (412) 455-5800
Page 7
P2110B
915 MHz RF Powerharvester® Receiver
TYPICAL PERFORMANCE GRAPHS
TA = 25°C, VOUT = 3.3V, VCAP = 1.2V, unless otherwise noted
Received Signal Strength Indicator
vs. RFIN (dBm)
Received Signal Strength Indicator
vs. RFIN (mW)
Initial CAP Charge Time to First
Activation vs. RFIN (dBm)
Initial CAP Charge Time to First
Activation vs. RFIN (mW)
2016/12
© 2016 Powercast Corporation, All rights reserved.
www.powercastco.com / contact@powercastco.com
+1 (412) 455-5800
Page 8
P2110B
915 MHz RF Powerharvester® Receiver
Mechanical Specifications
2016/12
© 2016 Powercast Corporation, All rights reserved.
www.powercastco.com / contact@powercastco.com
+1 (412) 455-5800
Page 9
P2110B
915 MHz RF Powerharvester® Receiver
P2110 MODULE SERIES
MODULE
P2110
P2110B
2016/12
STATUS
End-of-life
Replaced P2110
FUNCTIONAL DIFFERENCES
N/A
Increased RF-to-DC conversion
efficiency
VSET resistor values modified
© 2016 Powercast Corporation, All rights reserved.
www.powercastco.com / contact@powercastco.com
+1 (412) 455-5800
P a g e 10
P2110B
915 MHz RF Powerharvester® Receiver
IMPORTANT NOTICE
Information furnished by Powercast Corporation (Powercast) is believed to be accurate and
reliable. However, no responsibility is assumed by Powercast for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications are subject to change without notice.
No license is granted by implication or otherwise under any patent or patent rights of
Powercast. Trademarks and registered trademarks are the property of their respective owners.
POWERCAST PRODUCTS (INCLUDING HARDWARE AND/OR SOFTWARE) ARE NOT DESIGNED OR
INTENDED TO BE FAIL-SAFE, FAULT TOLERANT OR FOR USE IN ANY APPLICATION THAT COULD
LEAD TO DEATH, PERSONAL INJURY OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE
(INDIVIDUALLY AND COLLECTIVELY, “CRITICAL APPLICATIONS”), SUCH AS LIFE-SUPPORT OR
SAFETY DEVICES OR SYSTEMS, CLASS III MEDICAL DEVICES, NUCLEAR FACILITIES, APPLICATIONS
THAT AFFECT CONTROL OF A VEHICLE OR AIRCRAFT, APPLICATIONS RELATED TO THE
DEPLOYMENT OF AIRBAGS, OR ANY OTHER CRITICAL APPLICATIONS. CUSTOMER AGREES, PRIOR
TO USING OR DISTRIBUTING ANY SYSTEMS THAT INCORPORATE POWERCAST PRODUCTS, TO
THOROUGHLY TEST THE SAME FOR SAFETY PURPOSES. CUSTOMER ASSUMES THE SOLE RISK
AND LIABILITY OF ANY USE OF POWERCAST PRODUCTS IN CRITICAL APPLICATIONS, SUBJECT
ONLY TO APPLICABLE LAWS AND REGULATIONS GOVERNING LIMITATIONS ON PRODUCT
LIABILITY.
Powercast warrants its products in accordance with Powercast’s standard warranty available at
www.powercastco.com.
2016/12
© 2016 Powercast Corporation, All rights reserved.
www.powercastco.com / contact@powercastco.com
+1 (412) 455-5800
P a g e 11
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