Transcript Components of LPW Devices - Renesas e

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ID A16C: Outfitting Embedded Devices with
Low Power Wireless Communications
Design considerations for adding wireless
communications to low power embedded devices
Talon Communications
Shimon Gersten
CTO
14 October 2010
Version: 1.0
Renesas Technology and Solution Portfolio
Microcontrollers
& Microprocessors
#1 Market share
worldwide *
ASIC, ASSP
& Memory
Advanced and
proven technologies
Solutions
for
Innovation
Analog and
Power Devices
#1 Market share
in low-voltage
MOSFET**
* MCU: 31% revenue
basis from Gartner
"Semiconductor
Applications Worldwide
Annual Market Share:
Database" 25
March 2010
** Power MOSFET: 17.1%
on unit basis from
Marketing Eye 2009
(17.1% on unit basis).
2
Renesas Technology and Solution Portfolio
Microcontrollers
& Microprocessors
#1 Market share
worldwide *
Solutions
for
Innovation
ASIC, ASSP
& Memory
Advanced and
proven technologies
Analog and
Power Devices
#1 Market share
in low-voltage
MOSFET**
* MCU: 31% revenue
basis from Gartner
"Semiconductor
Applications Worldwide
Annual Market Share:
Database" 25
March 2010
** Power MOSFET: 17.1%
on unit basis from
Marketing Eye 2009
(17.1% on unit basis).
3
Microcontroller and Microprocessor Line-up
Superscalar, MMU, Multimedia
High Performance CPU, Low Power
High Performance CPU, FPU, DSC
 Up to 1200 DMIPS, 45, 65 & 90nm process
 Video and audio processing on Linux
 Server, Industrial & Automotive
 Up to 500 DMIPS, 150 & 90nm process
 600uA/MHz, 1.5 uA standby
 Medical, Automotive & Industrial
 Up to 165 DMIPS, 90nm process
 500uA/MHz, 2.5 uA standby
 Ethernet, CAN, USB, Motor Control, TFT Display
 Legacy Cores
 Next-generation migration to RX
General Purpose
 Up to 10 DMIPS, 130nm process
 350 uA/MHz, 1uA standby
 Capacitive touch
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Ultra Low Power
Embedded Security
 Up to 25 DMIPS, 150nm process  Up to 25 DMIPS, 180, 90nm process
 190 uA/MHz, 0.3uA standby
 1mA/MHz, 100uA standby
 Application-specific integration  Crypto engine, Hardware security
Definitions
 ISM – Instrumentation, Scientific & Medical bands. The
2.4GHz band is international.
 LPW – Low Power Wireless. The ISM transmitted power
allowed by various countries.
 MAC – Media Access Control
 RF – Radio Frequency
 RTOS – Real Time Operating System
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Sections
 Components of LPW devices
 Wireless protocols
 Wireless demand on software
 Wireless demands on power
 Major selection criteria
 Q&A
6
Components of LPW Battery Powered Devices – Typical







Antenna
RF matching
Radio
MAC HW
MCU
Power control
Battery
Antenna
RF matching
& filtering
IC: Transciever
+ MAC
Xtal
System Processor
Power control
Battery
Typical LPW device
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User IF
LED, LCD, keys
Components of LPW Devices
 Printed Antenna
 External Antennas
8
Components of LPW Battery Powered Devices
 Embedded antennas
 Rechargeable battery
9
Components of LPW Devices
 RF module with Radio IF
Antenna
RF matching
& filtering
Discrete Power
amplifier
Discrete LNA
Discrete Switch
Transceiver
MAC
RF and MAC discrete
System Processor
Custom device
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Xtal
Components of LPW Devices
 Network Processor RF module
Antenna
 Complete RF solution
RF matching
& filtering
LNA
 API IF to MCU
Power amplifier
Switch
Transciever
Xtal
MAC
MCU
Network Processor
System Processor
Custom device
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Xtal
Components of LPW Devices
 RF module with integrated
ICs for radio, Power amp
and LNA, and matching.
Antenna
RF matching
& filtering
 Radio IF to MCU
IC: Power amplifier
+ LNA
IC: Transceiver
+ MAC
RF and MAC integrated
System Processor
Custom device
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Xtal
Components of LPW Devices
 Antennas
 Internal
 Wire
 Printed
 Chip
 External
 Omni directional
 Directional
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Wireless Protocols – ISM bands
 IEEE 802.11 – WiFi
 Bluetooth – new LE
 Zigbee – new SE 2.0 (6lowPAN)
 802.15.4
 ANT
 Proprietary
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Wireless Protocols – Decision Making
 Performance
 Interoperability
 Network Topology
 Energy consumption
 Time to market
 Cost
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Wireless Protocols – Decision Making
 Performance
 Throughput – amount of payload per time
 Latency – time it takes for a specific data item to arrive.
 Reliability – odds of all data arriving up corrupted
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Wireless Protocols – Decision Making
 Interoperability
 Wifi –
MAC [.11a, .11b, .11g, .11n]
Ethernet IEEE 802.3
 Bluetooth – profiles [headset, printer, HID …]
 BLE – profiles [healthcare, sports]
 ZigBee – profiles [HA, Smart Energy, health …]
 ANT+ - profiles [heartbeat, bicycle, scale …]
 Proprietary – No Interop
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Wireless Protocols – Decision Making
 Network Topology
 Point to point
 Star – Hub point to many points
 Peer to peer – Communicating pairs
 Mesh - Any point, of many, to any
- Networks nodes serve as routers
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Wireless Demand on Software
 Sleep modes
 Run-time efficiency
 Co-existence with MAC
 Share common resources
 Power management
19
Wireless Demand on Software
 Share common resources
 RTOS
 Interrupts
 Timers
 RAM
 Code space
 Peripherals
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Wireless Demand on Power
 Receiver ON time
 Transmitter power
 Bit rate
 Error rate
 Overhead
 Wakeup time
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Major Selection Criteria
 Wireless protocol
 Level of RF integration
 Power source
 Enclosure
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Major Selection Criteria
 Wireless protocol
This is usually the first criteria to apply.
The selection of wireless protocol may affect:







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Processor class [32,16 or 8 bit]
RAM size
Code size
Interoperability
Power requirements
Device cost
Time to market
Major Selection Criteria
 Level of RF integration
This is both business and engineering criteria.
The selection of fully integrated module vs. custom
implementation depends on:







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Performance requirements
Power limitation
Projected volume
Product maturity
Available expertise
Time to market
Produce life and support
RF Module Risk
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Major Selection Criteria
TI
TI
Atmel
Nordic
CC2400
CC2500
ATR24
06
nRF24
L01
cost @ 10K [$]
3.60 @
100
2.00 @
100
3.00 @
3K
2.00
max rate [Mbps]
1
0.5
1.152
2
max channels
84
168
95
126
RX at rate current [mA]
24
17
57
12.3
TX @ 0 dBm current [mA]
19
21.6
42
11.3
sleep current [microA]
1.5
0.4
1
0.9
 Level of RF integration –
radio selection example:
22
standby current [microA]
RX sensitivity @ max rate
[-dBm]
87
Modulation
83
93
82
MSK
GFSK
GFSK
0.25
1.5
sleep to up [mS]
0.13
standby to up [mS]
6.5
SPI max rate [Mbps]
carrier detection
yes
yes
RSSI
yes
yes
10
yes
yes
yes
auto ACK
no
auto retry
crystal [+/-PPM], [MHz]
26
8
20,16
40,26
yes
10,13.8
24
60,16
Major Selection Criteria
 Power source
This is both usability and engineering criteria.
The selection of power source depends on:
 Power requirements [mains, battery, harvested …]
 Use case [no user access, available charger …]
 Device dimensions [4 x 30 x 40mm]
 Device weight [10 grams]
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Q&A
28
© 2010 Renesas Electronics America Inc.
All rights reserved.
Thank You!
29
© 2010 Renesas Electronics America Inc.
All rights reserved.
www.taloncom.com