-
P2110B 915 MHz RF Powerharvester
2016/12
© 2016www.powercastco.com
DESCRIPTION The Powercast P2110B Powerharvesteran RF energy
harvesting device that converts RF to DC. Housed in a compact
package, the P2110B receiver provides RF energy harvesting and
power management for battery-free, micro-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 P2110Bthe
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
P211and obtain other data from the component for improving overall
system operation. FEATURES High conversion efficiency Converts
low-level RF signals enabling
long range applications Regulated voltage output up to 5. 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 Externally resettable for microprocessor
control Industrial temperature range RoHS compliant
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 |
erharvester® Receiver
© 2016 Powercast Corporation, All rights reserved.
www.powercastco.com / [email protected]
Powerharvester is an RF energy harvesting device that
converts
Housed in a compact SMD receiver provides RF
energy harvesting and power management power devices. The
converts RF energy to DC and stores it in a capacitor. When a
charge threshold on
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
A microprocessor can be used to optimize the power usage from
the P2110B and obtain other data from the component for improving
overall system operation.
level RF signals enabling
Regulated voltage output up to 5.5V
signal strength indicator No external RF components required –
Internally matched to 50 ohms
dBm input power microprocessor
Industrial temperature range
APPLICATIONS Battery-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
PIN CONFIGURATION
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
8,432,062 | 8,461,817 | 8,621,245
TOP VIEW
+1 (412) 455-5800 P a g e 1
free wireless sensors
FUNCTIONAL BLOCK DIAGRAM
PIN CONFIGURATION
Powercast products and technology are covered by one or more of
the following patents and other patents pending: 7,898,105 |
7,925,308 | 8,159,090 | 8,380,255
TOP VIEW
-
P2110B 915 MHz RF Powerharvester® Receiver
2016/12
© 2016 Powercast Corporation, All rights reserved.
www.powercastco.com / [email protected]
+1 (412) 455-5800 P a g e 2
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
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 Label Function 1 NC No Connection. 2 GND RF Ground. Connect
to analog ground plane. 3 RFIN
RF Input. Connect to 50Ω antenna through a 50Ω transmission
line. Add a DC block if antenna is a DC short.
4 GND RF Ground. Connect to analog ground plane. 5 DSET Digital
Input. Set to enable measurement of harvested power. If this
function is not desired leave NC. 6 INT Digital Output.
Indicates that voltage is present at VOUT. 7 RESET Digital Input.
Set to disable VOUT. If this function is not desired leave NC.
8 VCAP Connect to an external capacitor for energy storage. 9 NC
No Connection.
10 VSET Output Voltage Adjustment. Sets the output voltage by
connecting a resistor to VOUT or GND. Leave NC for 3.3V.
11 GND DC Ground. Connect to analog ground plane. 12 VOUT DC
Output. Connect to external device. The output is preset to 3.3V
but
can be adjusted with an external resistor. 13 DOUT Analog
Output. Provides an analog voltage level corresponding to the
harvested power. 14 NC No Connection.
Exceeding the absolute maximum ratings may cause permanent
damage to the device.
-
P2110B 915 MHz RF Powerharvester® Receiver
2016/12
© 2016 Powercast Corporation, All rights reserved.
www.powercastco.com / [email protected]
+1 (412) 455-5800 P a g e 3
SPECIFICATIONS TA = 25°C, RFIN = 915MHz unless otherwise
noted.
Parameter Symbol Condition Min Typ Max Unit RF
Characteristics1
Input Power Frequency
RFIN
-12 902
10
928
dBm MHz
DC Characteristics Output Voltage Output Current VCAP Maximum
VCAP Minimum Signal Strength Boost Efficiency Maximum INT
Current
VOUT IOUT VMAX VMIN DOUT
RFIN = 0dBm IOUT = 20mA
2.0
3.3
1.25 1.02 275 85 0.1
5.5 50
V
mA V V
mV %
mA Digital Characteristics RESET Input High DSET Input High INT
Output High
1.8 VMIN
1
VMAX
V V V
Timing Characteristics DSET Delay RESET Delay RESET Pulse
Width
20
50 6.6
s s ns
1See typical performance graphs for operation at other
frequencies or power levels.
TIMING DIAGRAM
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P2110B 915 MHz RF Powerharvester® Receiver
2016/12
© 2016 Powercast Corporation, All rights reserved.
www.powercastco.com / [email protected]
+1 (412) 455-5800 P a g e 4
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
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.
-
P2110B 915 MHz RF Powerharvester® Receiver
2016/12
© 2016 Powercast Corporation, All rights reserved.
www.powercastco.com / [email protected]
+1 (412) 455-5800 P a g e 5
If the RSSI functionality is not used, DOUT and DSET should be
left unconnected. DSET is 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 TX91501-3W-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. 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.
If the RESET functionality is not used, RESET should be left
unconnected. RESET in internally pulled down 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. 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.
=1 ( − 1.21)
(3.32 − )
-
P2110B 915 MHz RF Powerharvester® Receiver
2016/12
© 2016 Powercast Corporation, All rights reserved.
www.powercastco.com / [email protected]
+1 (412) 455-5800 P a g e 6
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 Thickness
(H) Trace Width
(S) Spacing
(W) FR4
(εr = 4.2) 62 50 9
FR4 (εr = 4.2)
31 50 20
*All dimensions are in mils.
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.
-
P2110B 915 MHz RF Powerharvester
2016/12
© 2016www.powercastco.com
TYPICAL PERFORMANCE GRAPHS
Powerharvester Efficiency vs. RFIN (dBm)
Powerharvester Efficiency vs. Frequency
erharvester® Receiver
© 2016 Powercast Corporation, All rights reserved.
www.powercastco.com / [email protected]
PERFORMANCE GRAPHS TA = 25°C, VOUT = 3.3V, VCAP = 1.2V, unless
otherwise noted
Powerharvester Efficiency
Powerharvester Efficiency
Powerharvester Efficiency
vs. RFIN (mW)
Powerharvester Efficiency vs. Frequency
+1 (412) 455-5800 P a g e 7
= 1.2V, unless otherwise noted
Powerharvester Efficiency (mW)
Powerharvester Efficiency vs. Frequency
-
P2110B 915 MHz RF Powerharvester® Receiver
2016/12
© 2016 Powercast Corporation, All rights reserved.
www.powercastco.com / [email protected]
+1 (412) 455-5800 P a g e 8
TYPICAL PERFORMANCE GRAPHS TA = 25°C, VOUT = 3.3V, VCAP = 1.2V,
unless otherwise noted
Received Signal Strength Indicator vs. RFIN (dBm)
Initial CAP Charge Time to First Activation vs. RFIN (dBm)
Received Signal Strength Indicator
vs. RFIN (mW)
Initial CAP Charge Time to First Activation vs. RFIN (mW)
-
P2110B 915 MHz RF Powerharvester® Receiver
2016/12
© 2016 Powercast Corporation, All rights reserved.
www.powercastco.com / [email protected]
+1 (412) 455-5800 P a g e 9
Mechanical Specifications
-
P2110B 915 MHz RF Powerharvester® Receiver
2016/12
© 2016 Powercast Corporation, All rights reserved.
www.powercastco.com / [email protected]
+1 (412) 455-5800 P a g e 10
P2110 MODULE SERIES
MODULE STATUS FUNCTIONAL DIFFERENCES
P2110 End-of-life N/A P2110B Replaced P2110 Increased RF-to-DC
conversion
efficiency VSET resistor values modified
-
P2110B 915 MHz RF Powerharvester® Receiver
2016/12
© 2016 Powercast Corporation, All rights reserved.
www.powercastco.com / [email protected]
+1 (412) 455-5800 P a g e 11
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.
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