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| 型号： | CBC5300-24C |
| 厂商： | Cymbet Corporation |
| 文件页数： | 8/11页 |
| 文件大小： | 0K |
| 描述： | ENERCHIP EH CBC5300 MODULE |
| 产品目录绘图： | CBC5300-24C Module |
| 特色产品： | EnerChip? EH Energy Harvesting Module EnerChip? EH Solar Energy Harvesting Evaluation Kit |
| 标准包装： | 16 |
| 系列： | EnerChip™ EH |
| 模块/板类型： | 能量收集模块 |
| 适用于相关产品： | 薄膜充电式固态电池 |
| 产品目录页面： | 709 (CN2011-ZH PDF) |
| 相关产品： | 859-1009-6-ND - IC BATT SOLID ST ENERCHIP 16QFN 859-1009-1-ND - IC BATT SOLID ST ENERCHIP 16QFN 859-1009-2-ND - IC BATT SOLID ST ENERCHIP 16QFN 859-1005-5-ND - IC BATT SOLID ST ENERCHIP 16QFN |
| 其它名称： | 859-1000-5 |
Preliminary
EnerChip EH CBC5300
System Level Considerations when Using a Low Power Energy Harvester
The CBC5300 is capable of supplying 10s to 100s of μW of continuous power to the load. Most applications
operating with radios and microcontrollers typically need 10s to 100s of mW of power under peak load
conditions. The disparity between what is available and what is needed can be made up by limiting the
amount of time the load is powered and waiting sufficient time for the energy harvester to replenish the energy
storage device before the subsequent operation commences. In typical remote RF sensor applications, the
‘on’ time will be on the order of 5-20ms, with an ‘off’ time of several seconds to several hours depending on
the application and available energy source. The duty cycle is an important consideration when designing a
wireless system.
While it is relatively straightforward to calculate a power budget and design a system to work within the
constraints of the power and energy available, it is easy to overlook the power required to initialize the system
to a known state and to complete the radio link with the host system or peer nodes in a mesh network. The
initialization phase can sometimes take two to three times the power needed for steady state operation.
Ideally, the hardware should be in a low power state when the system power-on reset is in its active state. If
this is not possible, the microcontroller should place the hardware in a low power state as soon as possible.
After this is done, the microcontroller should be put into a sleep state long enough for the energy harvester
to replenish the energy storage device. If the power budget is not exceeded during this phase, the system
can continue with its initialization. Next, the main initialization of the system, radio links, analog circuits, and
so forth, can begin. Care should be taken to ensure that the time the system is on during this phase does
not exceed the power budget. Several sleep cycles might be needed to ‘stairstep’ the system up to its main
operational state. The Cymbet CBC5300 energy harvester module has a handshake line CHARGE to indicate
to the microcontroller when energy is available. Another way to know whether energy is available is to have the
microcontroller monitor the voltage on its power bus using one its internal A/D converters.
Circuit Recommendations to Save Power
In most system power budgets, the peak power required is not as critical as the length of time the power
is required. Careful selection of the message protocol for the RF link can have a significant impact on the
overall power budget. In many cases, using higher power analog circuits that can be turned on, settle quickly,
and be turned off can decrease the overall energy consumed. Microcontroller clock frequency can also have
a significant impact on the power budget. In some applications it might be advantageous to use a higher
microcontroller clock frequency to reduce the time the microcontroller and peripheral circuits are active. Avoid
using circuits that bias microcontroller digital inputs to mid-level voltages; this can cause significant amounts
of parasitic currents to flow. Use 10MΩ to 22MΩ pull-up/down resistors where possible. However, be aware
that high circuit impedances coupled with parasitic capacitance can make for a slow rise/fall time that can
place the voltage on the microcontroller inputs at mid-levels, resulting in parasitic current flow. One solution to
the problem is to enable the internal pull-up/down resistor of the microcontroller input to force the input to a
known state, then disable the resistor when it’s time to check the state of the line. If using the microcontroller’s
internal pull-up/down resistors on the inputs to bias push-button switches in a polled system, leave the pull-up/
down resistor disabled and enable the resistor only while checking the state of the input port. Alternatively, in
an interrupt-driven system, disable the pull-up/down resistor within the first few instructions in the interrupt
service routine. Enable the pull-up/down resistor only after checking that the switch has been opened.
Microcontroller pull-up/down resistors are typically less than 100kΩ and will present a relatively large load
on the system if left on continuously while a switch is being pressed, for example, or if held for any significant
length of time. For even greater reduction in power, use external pull-up/down resistors in the 10MΩ to 22MΩ
range. Bias the external resistor not with the power rail but with a microcontroller port. The same algorithm
used for internal pull-up/down resistors can then be used to save power. The CHARGE line on the CBC5300 has
a 10MΩ pull-up resistor with a very slow rise time. Use an internal microcontroller pull-down resistor to force
the CHARGE line low all of the time and then disable the pull-down resistor to check the state of the line. This
will keep the CHARGE line from biasing the input at mid level for long periods of time which could case large
parasitic currents to flow.
DS-72-06 Rev06
?2009 Cymbet Corporation ? Tel: +1-763-633-1780 ? www.cymbet.com
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| CBC-702 | 制造商:American Electronic Components Inc 功能描述:MERCURY RELAYS |
| CBC-707 | 制造商:American Electronic Components Inc 功能描述:MERCURY RELAYS |
| CBC-719 | 制造商:American Electronic Components / DURAKOOL 功能描述:MERCURY RELAY, 12VDC, 100A, SPDT; Coil Voltage VDC Nom:12V; Contact Current Max:100A; Coil Resistance:27ohm; Contact Configuration:SPDT; Relay Mounting:(Not Available) |
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| CBC-8 | 功能描述:断路器 CIRCUIT BREAKER RoHS:否 制造商:Phoenix Contact 产品:Device Circuit Breakers 产品类型:Thermomagnetic 电流额定值:2 A 电压额定值 AC:240 V, 277 V 电压额定值 DC:50 V 极数:1 Pole 执行器类型:Slide 电路功能:Trip Free 系列:CB TM1 工作温度范围:- 30 C to + 60 C 照明:No |
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