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Bluetooth Low Energy Current Consumption Measurements

www.cypress.com

Document No. 002-14934 Rev. *C

2

1.2

Acronyms and Abbreviations

In most cases, acronyms and abbreviations are defined on first use.

For a comprehensive list of acronyms and other terms used in Cypress documents, go to:

http://www.cypress.com/glossary

1.3

References

The references in this section may be used in conjunction with this document.

Note: 

Cypress provides customer access to technical documentation and software through its Cypress Developer 

Community and Downloads & Support site (see 

Overview

).

For Cypress documents, replace the “xx” in the document number with the largest number available in the reposi-
tory to ensure that you have the most current version of the document.

2

IoT Resources

Cypress provides a wealth of data at 

http://www.cypress.com/internet-things-iot

 

to help you to select the right IoT

device for your design, and quickly and effectively integrate the device into your design. Cypress provides cus-
tomer access to a wide range of information, including technical documentation, schematic diagrams, product bill
of materials, PCB layout information, and software updates. Customers can acquire technical documentation and
software from the Cypress Support Community website (

http://community.cypress.com/

).

3

Overview

The Bluetooth Low Energy (BLE) technology is a global standard for very low-power wireless technology. The BLE
devices can operate from coin cell batteries for applications that use low data rates. BLE devices can communi-
cate wirelessly to dual mode Bluetooth-enabled devices. The connections are designed to be robust, short range,
and low cost. The BLE-enabled devices are used in the area of fitness, advertising, medical, security, and home
entertainment.

4

Comparing Bluetooth Low Energy to Bluetooth 2.x/3.x

The similarities between the Bluetooth and the BLE technology allow a Bluetooth transceiver to have dual-mode
operation. Bluetooth and BLE technology can coexist in one device. For example, a BLE radio can use the follow-
ing items from an existing Bluetooth radio:

■

Radio architecture

■

Host controller interface (HCI) logical and physical transports

■

Logical link control and adaptation protocol (L2CAP)

The BLE technology differs from Bluetooth in the following areas:

■

Discovery and connection procedures are handled differently when it comes to lowering total power consump-
tion.

■

BLE is limited to only one packet type.

■

Connections are entered and always exited in sniff-like mode. 

■

Transmit and receive operations are governed by interframe spacing as opposed to being slot oriented. 

■

Profiles are thinner than standard Bluetooth and are structured around client/server architecture. 

■

BLE devices have lower duty cycles and only three advertising channels to lower connection time. The shorter 
enable and connection times result in lowering total power consumption. 

Document (or Item) Name

Broadcom 

Document Number

Cypress 

Document Number

Source

Cypress Items

Cypress Bluetooth/WLAN Motherboard For 

Cypress Bluetooth and Wireless LAN 

Applications Testing, BCM9UMB Hardware 

User Manual

9UMB-HWUM100-R 

–

Cypress Developer Community

 

 

Содержание AN214934

Страница 1: ...THIS SPEC IS OBSOLETE Spec No 002 14934 Spec Title AN214934 BLUETOOTH LOW ENERGY CURRENT CONSUMPTION MEASUREMENTS Replaced by NONE ...

Страница 2: ...and designers who are using the CYW4330 device in their design This document assumes that a user knows how to download firmware to the CYW4330 device If the CYW4330 device has already been integrated onto a platform the proper configuration files need to be loaded and the proper commands for BLE are generated by the host processor If an evaluation board is being used this can be accomplished by us...

Страница 3: ...plications that use low data rates BLE devices can communi cate wirelessly to dual mode Bluetooth enabled devices The connections are designed to be robust short range and low cost The BLE enabled devices are used in the area of fitness advertising medical security and home entertainment 4 Comparing Bluetooth Low Energy to Bluetooth 2 x 3 x The similarities between the Bluetooth and the BLE techno...

Страница 4: ...measure both without hav ing to use multiple pieces of equipment such as a scope and multimeter BLE is mostly in sleep mode with a very short active period 5 1 System Requirements The system requirements are listed below Host system requirements A personal computer running Microsoft Windows operating system is required to use BlueTool Cypress recommends running Windows XP however other versions of...

Страница 5: ...ev C 4 5 2 Test Equipment Settings Agilent N6705A with N6761A precision power module is used Settings for the N6761A are Range 0 1A Current limit 0 1A Sampling rate 0 04 ms Mode Data logger mode is used to capture current consumption Figure 1 Board Configuration for the BLE Current Consumption ...

Страница 6: ...www cypress com Document No 002 14934 Rev C 5 5 3 Daughterboard Settings The McLaren daughterboard has to be configured prior to taking the measurements Remove L10 and R30 on the topside of the board refer to Figure 2 Figure 2 CYW4330 McLaren Daughterboard ...

Страница 7: ... Energy Current Consumption Measurements www cypress com Document No 002 14934 Rev C 6 Remove R23 on the bottomside of the board refer to Figure 3 Figure 3 R23 on the Bottomside of the CYW4330 McLaren Daughterboard ...

Страница 8: ... exter nal power supply powers the rest of the BCM9UMB Connect power analyzer to EXT2 and GND Plug in power to the BCM9UMB as normal and enable the power to the daughterboard from the power analyzer The voltage from the power analyzer should be 3 3V Refer to 5 2 Test Equipment Settings for the power analyzer settings Use the analyzer Data Logger mode to measure the current consumption Equivalent e...

Страница 9: ...e and both switch positions need to be changed See Figure 6 for schematic and switch logic J28 1 can be used to measure the state of BT_WAKE Figure 5 Bluetooth GPIO Controls Table 3 Bluetooth GPIO Debug Settings for the SW4 DIP Switch Signal Configuration IO Drive BT_GPIO_0 Pole 1 Pole 2 High ON OFF Low OFF ON Float no connect OFF OFF BT_GPIO_1 Pole 3 Pole 4 High ON OFF Low OFF ON Float no connect...

Страница 10: ...Bluetooth Low Energy Current Consumption Measurements www cypress com Document No 002 14934 Rev C 9 Figure 6 Switch Location of SW4 ...

Страница 11: ...d for collecting current consumption measurements This section provides steps for loading the configuration file Follow these steps to load the configuration file after the CYW4330 McLaren daughterboard is powered up 1 Launch the Cypress BlueTool software 2 Enter CNTL 0 to open the log window 3 Enter CNTL 1 to open the HCI Control Window 4 Select the port connected to the BCM9UMB and click OK Typi...

Страница 12: ...th Low Energy Current Consumption Measurements www cypress com Document No 002 14934 Rev C 11 5 Click Reset and the log window should display success 6 Select the 0 Vendor specific Commands 0 key from the list ...

Страница 13: ...Bluetooth Low Energy Current Consumption Measurements www cypress com Document No 002 14934 Rev C 12 7 Select the Download Minidriver from the list and enter CNTL 9 ...

Страница 14: ...advertising and scan mode Note Contact your local Cypress technical representative for BlueTool support and to download the configuration file refer to 5 5 Loading the Configuration File needed for the following sections 6 1 Advertising Mode The BLE technology broadcasts connection packets in the advertising mode For example a temperature sensor broadcasts at certain intervals when temperature dat...

Страница 15: ...et_Sleepmode_Param window select UART from the Sleep_Mode list Ensure that the BT_WAKE_Active_Mode is set to Active Low and click OK 5 In the HCI Control window select 7 8 LE Controller Commands 8 key from the list 6 Select LE_Set_Advertising_Data from the menu Set the Advertising_Data parameter with any 4 bytes ...

Страница 16: ...asurements www cypress com Document No 002 14934 Rev C 15 7 Select LE_Set_Advertising_Parameters from the menu 8 Set the LE_Set_Advertising_Parameters by selecting both the Advertising_Interval_Min and Advertising_In terval_Max to 4096 click OK ...

Страница 17: ...mption will be approximately 4 mA To put the device in Sleep mode toggle position 1 and 2 of the SW4 refer to Figure 6 and Table 3 to set BT_WAKE to high The results from the N6705A DC power analyzer are shown below The average current consumption for the advertising mode is 162 μA with 4 bytes of data It is measured over 2 56 seconds advertising interval The actual current consumption is approxim...

Страница 18: ...ent No 002 14934 Rev C 17 11 Switch the BT_WAKE to low by toggling position 1 and 2 of the SW4 refer to Figure on page 8 and Table 3 for BT_WAKE control 12 Select LE_Set_Advertise_Enable from the menu In the Advertising_Enable window select Advertising is disabled and click OK ...

Страница 19: ...ample of a non connected mode 1 Launch the Cypress BlueTool software 2 From the Transport menu select HCI Control or enter CNTL 1 3 In the HCI Control window select 0 Vendor specific Commands 0 key from the list 4 Select Set_Sleepmode_Param from the menu 5 In the Set_Sleepmode_Param window select UART from the Sleep_Mode list Ensure that the BT_WAKE_Active_Mode is set to Active Low and click OK ...

Страница 20: ...w select 7 8 LE Controller Commands 8 key from the list 7 Select LE_Set_Scan_Parameters from the menu Set the scan parameters as below and click OK LE_Scan_type Passive Scanning LE_Scan_Interval 2048 LE_Scan_Window 18 8 Select LE_Set_Scan_Enable from the menu In the LE_Scan_Enable window select Scanning is enabled and click OK ...

Страница 21: ...eep mode toggle position 1 and 2 of the SW4 refer to Figure 6 and Table 3 to set BT_WAKE to high The results from the N6705A DC power analyzer are shown below The average current consumption for the scan mode is 341 μA It is measured over 1 28 seconds scan interval Again there is 20 μA of current leakage in the front end module U2 The corrected current con sumption should be approximately 321 μA ...

Страница 22: ... com Document No 002 14934 Rev C 21 10 Switch the BT_WAKE to low by toggling position 1 and 2 of the SW4 refer to Figure 6 and Table 3 for BT_WAKE control 11 Select LE_Set_Scan_Enable from the menu In the LE_Scan_Enable window select Scanning is disabled and click OK ...

Страница 23: ...nts Document Number 002 14934 Rev ECN No Orig of Change Submission Date Description of Change 05 12 2011 4330 AN400 R Initial release A 5480516 UTSV 11 22 2016 Updated Introduction on page 1 Added Cypress Part Numbering Scheme on page 1 Updated to Cypress template B 5881153 AESATMP8 09 12 2017 Updated Cypress Logo and Copyright C 6580019 JPCH 05 23 2019 Obsolete document Completing Sunset Review ...

Страница 24: ...functionality and safety of any appli cation made of this information and any resulting product Cypress products are not designed intended or authorized for use as critical components in systems designed or intended for the operation of weapons weapons systems nuclear installations life support devices or systems other medical devices or systems including resuscitation equipment and surgical impla...

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