TI CC2531F256RHAR

CC2531
www.ti.com ........................................................................................................................................................................................ SWRS086 – SEPTEMBER 2009
A USB Enabled System-On-Chip Solution for 2.4-GHz IEEE 802.15.4 and ZigBee
Applications
FEATURES
1
• RF/Layout
– 2.4-GHz IEEE 802.15.4 Compliant RF
Transceiver
– Excellent Receiver Sensitivity and
Robustness to Interference
– Programmable Output Power Up to 4.5 dBm
– Few External Components
– Only a Single Crystal Needed for Mesh
Network Systems
– 6-mm × 6-mm QFN40 Package
– Suitable for Systems Targeting Compliance
With Worldwide Radio-Frequency
Regulations: ETSI EN 300 328 and EN 300
440 (Europe), FCC CFR47 Part 15 (US) and
ARIB STD-T-66 (Japan)
• USB
– USB 2.0 Certified Full Speed Device (12
Mbps)
– 5 Highly Flexible Endpoints
– 1-KB dedicated FIFO
– DMA access to FIFO
– No 48-MHz Crystal Required
• Low Power
– Active Mode RX (CPU Idle): 24 mA
– Active Mode TX at 1 dBm (CPU Idle): 29 mA
– Power Mode 1 (4 µs Wake-Up): 0.2 mA
– Power Mode 2 (Sleep Timer Running): 1 µA
– Power Mode 3 (External Interrupts): 0.4 µA
– Wide Supply-Voltage Range (2 V–3.6 V)
• Microcontroller
– High-Performance and Low-Power 8051
Microcontroller Core With Code Prefetch
– 256-KB In-System-Programmable Flash
– 8-KB RAM With Retention in All Power
Modes
– Hardware Debug Support
•
234
•
Peripherals
– Powerful Five-Channel DMA
– IEEE 802.15.4 MAC Timer, General-Purpose
Timers (One 16-Bit, Two 8-Bit)
– IR Generation Circuitry
– 32-kHz Sleep Timer With Capture
– CSMA/CA Hardware Support
– Accurate Digital RSSI/LQI Support
– Battery Monitor and Temperature Sensor
– 12-Bit ADC With Eight Channels and
Configurable Resolution
– AES Security Coprocessor
– Two Powerful USARTs With Support for
Several Serial Protocols
– 21 General-Purpose I/O Pins
(19 × 4 mA, 2 × 20 mA)
– Watchdog Timer
Development Tools
– CC2531 Development Kit
– Certified CC2531 USB Dongle Reference
Design
– SmartRF™ Software
– Packet Sniffer
– IAR Embedded Workbench™ Available
APPLICATIONS
•
•
•
•
•
•
•
•
•
•
USB Upgradable 2.4-GHz IEEE 802.15.4
Systems
RF4CE Remote Control Target for TV or STB
PC Peripherals
ZigBee Systems
Home/Building Automation
Lighting Systems
Industrial Control and Monitoring
Low-Power Wireless Sensor Networks
Consumer Electronics
Health Care
1
2
3
4
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
SmartRF, Z-Stack, RemoTI are trademarks of Texas Instruments.
IAR Embedded Workbench is a trademark of IAR Systems AB.
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated
CC2531
SWRS086 – SEPTEMBER 2009 ........................................................................................................................................................................................ www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
DESCRIPTION
The CC2531 is a USB enabled true system-on-chip (SoC) solution for IEEE 802.15.4, Zigbee and RF4CE
applications. It enables USB dongles or USB upgradable network nodes to be built with low total bill-of-material
costs. The CC2531 combines the performance of a leading RF transceiver with an industry-standard enhanced
8051 MCU, in-system programmable flash memory, 8-KB RAM, and many other powerful features. The CC2531
has various operating modes, making it suited for systems where ultralow power consumption is required. Short
transition times between operating modes further ensure low energy consumption. Source code for USB HID and
CDC libraries and examples are downloadable from the CC2531 product page on www.ti.com.
Combined with the industry-leading and golden-unit-status ZigBee protocol stack (Z-Stack™) from Texas
Instruments, the CC2531 provides a robust and complete ZigBee USB dongle or firmware upgradable network
node.
Combined with the golden-unit-status RemoTI™ stack from Texas Instruments, the CC2531 provides a robust
ZigBee RF4CE remote-control target for USB dongle or TV/STB implementations.
DIGITAL
VDD (2 V–3.6 V)
RESET
WATCHDOG
TIMER
ON-CHIP VOLTAGE
REGULATOR
32-MHz
CRYSTAL OSC
HIGH-SPEED
RC-OSC
POWER ON RESET
BROWN OUT
32.768-kHz
CRYSTAL OSC
32-kHz
RC-OSC
SLEEP TIMER
DEBUG
INTERFACE
CLOCK MUX and
CALIBRATION
SLEEP MODE CONTROLLER
1-KB USB FIFO
USB
DMA
8051 CPU
CORE
DCOUPL
ANALOG
MIXED
RESET_N
XOSC_Q2
XOSC_Q1
P2_4
P2_3
DP
DM
USB PHY
P2_2
P2_1
256-KB FLASH
P2_0
MEMORY
ARBITRATOR
P1_6
P1_5
P1_4
P1_3
P1_2
P1_1
P1_0
I/O CONTROLLER
P1_7
8-KB SRAM
IRQ CTRL
ADC
AUDIO/DC
8 CHANNELS
AES
ENCRYPTION
AND
DECRYPTION
FLASH WRITE
RADIO REGISTERS
CSMA/CA STROBE
PROCESSOR
P0_7
P0_5
USART 1
RADIO DATA INTERFACE
P0_4
P0_3
P0_2
USART 2
DEMODULATOR
AGC
MODULATOR
P0_1
P0_0
TIMER 1 (16-Bit)
TIMER 3 (8-Bit)
RECEIVE
CHAIN
TIMER 4 (8-Bit)
FREQUENCY
SYNTHESIZER
TIMER 2
(IEEE 802.15.4 MAC TIMER)
RF_P
FIFO and FRAME CONTROL
P0_6
TRANSMIT
CHAIN
RF_N
B0300-02
2
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CC2531
www.ti.com ........................................................................................................................................................................................ SWRS086 – SEPTEMBER 2009
ABSOLUTE MAXIMUM RATINGS (1)
MIN
Supply voltage
All supply pins must have the same voltage
MAX
–0.3
3.9
V
–0.3
VDD + 0.3,
≤ 3.9
V
10
dBm
–40
125
°C
All pads, according to human-body model, JEDEC STD 22, method
A114
2
kV
According to charged-device model, JEDEC STD 22, method C101
500
V
Voltage on any digital pin
Input RF level
Storage temperature range
ESD (2)
(1)
(2)
UNIT
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating
Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
CAUTION: ESD sensitive device. Precaution should be used when handling the device in order to prevent permanent damage.
RECOMMENDED OPERATING CONDITIONS
MIN
MAX
UNIT
–40
125
°C
2
3.6
V
Operating ambient temperature range, TA
Operating supply voltage
ELECTRICAL CHARACTERISTICS
Measured on Texas Instruments CC2530 EM reference design with TA = 25°C and VDD = 3 V, unless otherwise noted.
Boldface limits apply over the entire operating range, TA = –40°C to 125°C, VDD = 2 V to 3.6 V, and fc = 2394 MHz to
2507 MHz.
PARAMETER
Icore
Core current consumption
TEST CONDITIONS
MIN
3.4
32-MHz XOSC running. No radio or peripherals active.
Medium CPU activity: normal flash access (1), no RAM access
6.5
mA
8.9
mA
32-MHz XOSC running, radio in RX mode, –50-dBm input
power, no peripherals active, CPU idle
20.5
32-MHz XOSC running, radio in RX mode at -100-dBm input
power (waiting for signal), no peripherals active, CPU idle
24.3
32-MHz XOSC running, radio in TX mode, 1-dBm output
power, no peripherals active, CPU idle
28.7
32-MHz XOSC running, radio in TX mode, 4.5-dBm output
power, no peripherals active, CPU idle
33.5
39.6
mA
0.2
0.3
mA
Power mode 2. Digital regulator off; 16-MHz RCOSC and
32-MHz crystal oscillator off; 32.768-kHz XOSC, POR, and
sleep timer active; RAM and register retention
1
2
µA
Power mode 3. Digital regulator off; no clocks; POR active;
RAM and register retention
0.4
1
µA
Power mode 1. Digital regulator on; 16-MHz RCOSC and
32-MHz crystal oscillator off; 32.768-kHz XOSC, POR, BOD
and sleep timer active; RAM and register retention
(1)
TYP MAX UNIT
Digital regulator on. 16-MHz RCOSC running. No radio,
crystals, or peripherals active.
Medium CPU activity: normal flash access (1), no RAM access
mA
29.6
mA
mA
Normal flash access means that the code used exceeds the cache storage, so cache misses happen frequently.
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CC2531
SWRS086 – SEPTEMBER 2009 ........................................................................................................................................................................................ www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Measured on Texas Instruments CC2530 EM reference design with TA = 25°C and VDD = 3 V, unless otherwise noted.
Boldface limits apply over the entire operating range, TA = –40°C to 125°C, VDD = 2 V to 3.6 V, and fc = 2394 MHz to
2507 MHz.
PARAMETER
TEST CONDITIONS
MIN
TYP MAX UNIT
Peripheral Current Consumption (Adds to core current Icore for each peripheral unit activated)
Iperi
Timer 1
Timer running, 32-MHz XOSC used
90
µA
Timer 2
Timer running, 32-MHz XOSC used
90
µA
Timer 3
Timer running, 32-MHz XOSC used
60
µA
Timer 4
Timer running, 32-MHz XOSC used
70
µA
Sleep timer
Including 32.753-kHz RCOSC
0.6
µA
USB
Measured on CC2531 Dongle reference design, 48 MHz clock
running, USB enabled
0.1
mA
ADC
When converting
Flash
1.2
mA
Erase
1
mA
Burst write peak current
6
mA
GENERAL CHARACTERISTICS
Measured on Texas Instruments CC2530 EM reference design with TA = 25°C and VDD = 3 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
WAKE-UP AND TIMING
Power mode 1 → active
Digital regulator on, 16-MHz RCOSC and 32-MHz crystal
oscillator off. Start-up of 16-MHz RCOSC
4
µs
Power mode 2 or 3 → active
Digital regulator off, 16-MHz RCOSC and 32-MHz crystal
oscillator off. Start-up of regulator and 16-MHz RCOSC
0.1
ms
Initially running on 16-MHz RCOSC, with 32-MHz XOSC
OFF
0.5
ms
Active → TX or RX
With 32-MHz XOSC initially on
RX/TX and TX/RX turnaround
USB PLL startup time
With 32-MHz XOSC initially on
192
µs
192
µs
µs
32
RADIO PART
RF frequency range
Programmable in 1-MHz steps, 5 MHz between channels
for compliance with [1]
Radio baud rate
As defined by [1]
250
Radio chip rate
As defined by [1]
2
4
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2394
2507
MHz
kbps
MChip/s
Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): CC2531
CC2531
www.ti.com ........................................................................................................................................................................................ SWRS086 – SEPTEMBER 2009
RF RECEIVE SECTION
Measured on Texas Instruments CC2530 EM reference design with TA = 25°C, VDD = 3 V, and fc = 2440 MHz, unless
otherwise noted.
Bold limits apply over the entire operating range, TA = –40°C to 125°C, VDD = 2 V to 3.6 V, and fc = 2394 MHz to 2507 MHz.
PARAMETER
TEST CONDITIONS
MIN
PER = 1%, as specified by [1]
Receiver sensitivity
TYP MAX
–97
[1] requires –85 dBm
–92
–88
UNIT
dBm
Saturation (maximum input level)
PER = 1%, as specified by [1]
[1] requires –20 dBm
10
dBm
Adjacent-channel rejection, 5-MHz
channel spacing
Wanted signal –82 dBm, adjacent modulated channel at
5 MHz, PER = 1 %, as specified by [1].
[1] requires 0 dB
49
dB
Adjacent-channel rejection, –5-MHz
channel spacing
Wanted signal –82 dBm, adjacent modulated channel at
–5 MHz, PER = 1 %, as specified by [1].
[1] requires 0 dB
49
dB
Alternate-channel rejection, 10-MHz
channel spacing
Wanted signal –82 dBm, adjacent modulated channel at
10 MHz, PER = 1%, as specified by [1]
[1] requires 30 dB
57
dB
Alternate-channel rejection, –10-MHz
channel spacing
Wanted signal –82 dBm, adjacent modulated channel at
–10 MHz, PER = 1 %, as specified by [1]
[1] requires 30 dB
57
dB
57
57
dB
–3
dB
Channel rejection
Wanted signal at –82 dBm. Undesired signal is an IEEE
802.15.4 modulated channel, stepped through all channels
from 2405 to 2480 MHz. Signal level for PER = 1%.
≥ 20 MHz
≤ –20 MHz
Wanted signal at –82 dBm. Undesired signal is 802.15.4
modulated at the same frequency as the desired signal. Signal
level for PER = 1%.
Co-channel rejection
Blocking/desensitization
5 MHz from band edge
10 MHz from band edge
20 MHz from band edge
50 MHz from band edge
–5 MHz from band edge
–10 MHz from band edge
–20 MHz from band edge
–50 MHz from band edge
Wanted signal 3 dB above the sensitivity level, CW jammer,
PER = 1%. Measured according to EN 300 440 class 2.
Spurious emission. Only largest spurious
Conducted measurement with a 50-Ω single-ended load.
emission stated within each band.
Suitable for systems targeting compliance with EN 300 328,
30 MHz–1000 MHz
EN 300 440, FCC CFR47 Part 15 and ARIB STD-T-66.
1 GHz–12.75 GHz
Frequency error tolerance (1)
Symbol rate error tolerance
(2)
Sensitivity impact of USB operation
(1)
(2)
–33
–33
–32
–31
–35
–35
–34
–34
≤80
–57
dBm
dBm
[1] requires minimum 80 ppm
±150
ppm
[1] requires minimum 80 ppm
±1000
ppm
Measured on CC2531 Dongle reference design with CDC bulk
transfer to PC at maximum speed.
0.5
dB
Difference between center frequency of the received RF signal and local oscillator frequency.
Difference between incoming symbol rate and the internally generated symbol rate
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CC2531
SWRS086 – SEPTEMBER 2009 ........................................................................................................................................................................................ www.ti.com
RF TRANSMIT SECTION
Measured on Texas Instruments CC2530 EM reference design with TA = 25°C, VDD = 3 V and fc = 2440 MHz, unless
otherwise noted.
Boldface limits apply over the entire operating range, TA = –40°C to 125°C, VDD = 2 V to 3.6 V and fc = 2394 MHz to 2507
MHz.
PARAMETER
Nominal output power
TEST CONDITIONS
MIN
Delivered to a single-ended 50-Ω load through a balun using
maximum-recommended output-power setting
0
[1] requires minimum –3 dBm
Max recommended output power setting (1)
Measured conducted
according to stated
regulations. Only largest
spurious emission stated
within each band.
25 MHz–1000 MHz (outside restricted bands)
25 MHz–2400 MHz (within FCC restricted bands)
25 MHz–1000 MHz (within ETSI restricted bands)
1800–1900 MHz (ETSI restricted band)
5150–5300 MHz (ETSI restricted band)
At 2 × fc and 3 × fc (FCC restricted band)
At 2 × fc and 3 × fc (ETSI EN 300-440 and EN 300-328) (2)
1 GHz–12.75 GHz (outside restricted bands)
At 2483.5 MHz and above (FCC restricted band)
fc= 2480 MHz (3)
–60
–60
–60
–57
–55
–42
–31
–53
Error vector magnitude (EVM)
Optimum load impedance
Differential impedance as seen from the RF port (RF_P and RF_N)
towards the antenna
6
8
UNIT
dBm
dB
dBm
–42
Measured as defined by [1] using maximum-recommended
output-power setting
[1] requires maximum 35%.
(3)
MAX
10
32
Spurious emissions
(2)
4.5
–8
Programmable output power
range
(1)
TYP
2%
69 + j29
Ω
Texas Instruments CC2530 EM reference design is suitable for systems targeting compliance with EN 300 328, EN 300 440, FCC
CFR47 Part 15 and ARIB STD-T-66.
Margins for passing conducted requirements at the third harmonic can be improved by using a simple band-pass filter connected
between matching network and RF connector (1.8 pF in parallel with 1.6 nH); this filter must be connected to a good RF ground.
Margins for passing FCC requirements at 2483.5 MHz and above when transmitting at 2480 MHz can be improved by using a lower
output-power setting or having less than 100% duty cycle.
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CC2531
www.ti.com ........................................................................................................................................................................................ SWRS086 – SEPTEMBER 2009
32-MHz CRYSTAL OSCILLATOR
Measured on Texas Instruments CC2530 EM reference design with TA = 25°C and VDD = 3 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
Crystal frequency
TYP
MAX
32
Crystal frequency accuracy
requirement (1)
UNIT
MHz
–40
40
ppm
ESR
Equivalent series resistance
6
60
Ω
C0
Crystal shunt capacitance
1
7
pF
CL
Crystal load capacitance
10
Start-up time
Power-down guard time
(1)
16
0.3
The crystal oscillator must be in power down for a
guard time before it is used again. This
requirement is valid for all modes of operation. The
need for power-down guard time can vary with
crystal type and load.
pF
ms
3
ms
Including aging and temperature dependency, as specified by [1]
32.768-kHz CRYSTAL OSCILLATOR
Measured on Texas Instruments CC2530 EM reference design with TA = 25°C and VDD = 3 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
Crystal frequency
TYP
MAX
32.768
Crystal frequency accuracy
requirement (1)
–40
UNIT
kHz
40
ppm
130
Ω
ESR
Equivalent series resistance
40
C0
Crystal shunt capacitance
0.9
2
pF
CL
Crystal load capacitance
12
16
pF
Start-up time
0.4
(1)
s
Including aging and temperature dependency, as specified by [1]
32-kHz RC OSCILLATOR
Measured on Texas Instruments CC2530 EM reference design with TA = 25°C and VDD = 3 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
Calibrated frequency (1)
32.753
Frequency accuracy after calibration
±0.2%
Temperature coefficient (2)
Supply-voltage coefficient
(3)
Calibration time (4)
(1)
(2)
(3)
(4)
MAX
UNIT
kHz
0.4
%/°C
3
%/V
2
ms
The calibrated 32-kHz RC oscillator frequency is the 32-MHz XTAL frequency divided by 977.
Frequency drift when temperature changes after calibration
Frequency drift when supply voltage changes after calibration
When the 32-kHz RC oscillator is enabled, it is calibrated when a switch from the 16-MHz RC oscillator to the 32-MHz crystal oscillator
is performed while SLEEPCMD.OSC32K_CALDIS is 0.
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CC2531
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16-MHz RC OSCILLATOR
Measured on Texas Instruments CC2530 EM reference design with TA = 25°C and VDD = 3 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
Frequency (1)
MAX
Uncalibrated frequency accuracy
±18%
Calibrated frequency accuracy
±0.6%
MHz
±1%
Start-up time
µs
10
Initial calibration time (2)
(1)
(2)
UNIT
16
µs
50
The calibrated 16-MHz RC oscillator frequency is the 32-MHz XTAL frequency divided by 2.
When the 16-MHz RC oscillator is enabled, it is calibrated when a switch from the 16-MHz RC oscillator to the 32-MHz crystal oscillator
is performed while SLEEPCMD.OSC_PD is set to 0.
RSSI/CCA CHARACTERISTICS
Measured on Texas Instruments CC2530 EM reference design with TA = 25°C and VDD = 3 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
RSSI range
TYP
MAX
UNIT
100
dB
Absolute uncalibrated RSSI/CCA accuracy
±4
dB
RSSI/CCA offset (1)
73
dB
1
dB
Step size (LSB value)
(1)
Real RSSI = Register value – offset
FREQEST CHARACTERISTICS
Measured on Texas Instruments CC2530 EM reference design with TA = 25°C and VDD = 3 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
FREQEST range
TYP
MAX
UNIT
±250
kHz
FREQEST accuracy
±40
kHz
FREQEST offset (1)
20
kHz
Step size (LSB value)
7.8
kHz
(1)
Real FREQEST = Register value – offset
FREQUENCY SYNTHESIZER CHARACTERISTICS
Measured on Texas Instruments CC2530 EM reference design with TA = 25°C, VDD = 3 V and fc = 2440 MHz, unless
otherwise noted.
PARAMETER
Phase noise, unmodulated carrier
TEST CONDITIONS
MIN
TYP
At ±1-MHz offset from carrier
–110
At ±2-MHz offset from carrier
–117
At ±5-MHz offset from carrier
–122
MAX
UNIT
dBc/Hz
ANALOG TEMPERATURE SENSOR
Measured on Texas Instruments CC2530 EM reference design with TA = 25°C and VDD = 3 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
Output at 25°C
Initial accuracy without calibration
Accuracy using 1-point calibration (entire
temperature range)
4.5
Measured using integrated ADC using
internal bandgap voltage reference and
maximum resolution
Current consumption when enabled (ADC
current not included)
8
TYP
1480
Temperature coefficient
Voltage coefficient
MIN
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1
MAX
UNIT
12-bit ADC
/1°C
/0.1 V
±10
°C
±5
°C
0.5
mA
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CC2531
www.ti.com ........................................................................................................................................................................................ SWRS086 – SEPTEMBER 2009
ADC CHARACTERISTICS
TA = 25°C and VDD = 3 V, unless otherwise noted.
PARAMETER
ENOB (1)
MIN
TYP MAX
Input voltage
VDD is voltage on AVDD5 pin
0
VDD
V
External reference voltage
VDD is voltage on AVDD5 pin
0
VDD
V
External reference voltage differential
VDD is voltage on AVDD5 pin
0
Input resistance, signal
Using 4-MHz clock speed
197
kΩ
Full-scale signal (1)
Peak-to-peak, defines 0 dBFS
2.97
V
Effective number of bits
Single-ended input, 7-bit setting
5.7
Single-ended input, 9-bit setting
7.5
Single-ended input, 10-bit setting
9.3
Single-ended input, 12-bit setting
10.8
Differential input, 7-bit setting
Differential input, 9-bit setting
8.3
Differential input, 10-bit setting
10.0
11.5
Single-ended input, 12-bit setting, –6 dBFS
–75.
2
Differential input, 12-bit setting, –6 dBFS
–86.
6
Single-ended input, 12-bit setting
70.2
Differential input, 12-bit setting
79.3
Single-ended input, 12-bit setting, –6 dBFS
78.8
Differential input, 12-bit setting, –6 dBFS
88.9
Common-mode rejection ratio
Differential input, 12-bit setting, 1-kHz sine (0
dBFS), limited by ADC resolution
>84
dB
Crosstalk
Single-ended input, 12-bit setting, 1-kHz sine (0
dBFS), limited by ADC resolution
>84
dB
Offset
Midscale
–3
mV
0.68
%
Gain error
DNL (1)
Differential nonlinearity
INL (1)
Integral nonlinearity
(1)
Signal-to-noise-and-distortion
Conversion time
12-bit setting, mean
12-bit setting, maximum
12-bit setting, mean
0.05
0.9
4.6
12-bit setting, maximum
13.3
Single-ended input, 7-bit setting
35.4
Single-ended input, 9-bit setting
46.8
Single-ended input, 10-bit setting
57.5
Single-ended input, 12-bit setting
66.6
Differential input, 7-bit setting
40.7
Differential input, 9-bit setting
51.6
Differential input, 10-bit setting
61.8
Differential input, 12-bit setting
70.8
7-bit setting
20
9-bit setting
36
10-bit setting
68
12-bit setting
132
Power consumption
Internal reference voltage
(1)
bits
0–20
Signal to nonharmonic ratio (1)
SINAD
(–THD+N)
6.5
V
7-bit setting, both single and differential
Total harmonic distortion
CMRR
VDD
UNIT
Differential input, 12-bit setting
Useful power bandwidth
THD (1)
TEST CONDITIONS
kHz
dB
dB
LSB
LSB
dB
µs
1.2
mA
1.15
V
Measured with 300-Hz sine-wave input and VDD as reference.
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ADC CHARACTERISTICS (continued)
TA = 25°C and VDD = 3 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP MAX
Internal reference VDD coefficient
4
Internal reference temperature coefficient
UNIT
mV/V
0.4
mV/10°C
CONTROL INPUT AC CHARACTERISTICS
TA = –40°C to 125°C, VDD = 2 V to 3.6 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
32
MHz
System clock, fSYSCLK
tSYSCLK = 1/fSYSCLK
The undivided system clock is 32 MHz when crystal oscillator is used.
The undivided system clock is 16 MHz when calibrated 16-MHz RC
oscillator is used.
16
RESET_N low duration
See item 1, Figure 1. This is the shortest pulse that is recognized as
a complete reset pin request. Note that shorter pulses may be
recognized but might not lead to complete reset of all modules within
the chip.
1
µs
Interrupt pulse duration
See item 2, Figure 1.This is the shortest pulse that is recognized as
an interrupt request.
20
ns
RESET_N
1
2
Px.n
T0299-01
Figure 1. Control Input AC Characteristics
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SPI AC CHARACTERISTICS
TA = –40°C to 125°C, VDD = 2 V to 3.6 V, unless otherwise noted.
PARAMETER
t1
TEST CONDITIONS
MIN
TYP
MAX
UNIT
SCK period
Master, Rx and Tx
SCK duty cycle
Master
t2
SSN low to SCK
Master
63
t3
SCK to SSN high
Master
63
t4
MO early out
Master, load = 10 pF
t7
MO late out
Master, load 10 = pF
t6
MI setup
Master
90
ns
t5
MI hold
Master
10
ns
t1
SCK period
Slave, Rx and Tx
SCK duty cycle
Slave
t2
SSN low to SCK
Slave
63
ns
t3
SCK to SSN high
Slave
63
ns
t6
MO setup
Slave
35
ns
t5
MO hold
Slave
10
t5
MI late out
Slave, load = 10 pF
Operating frequency
250
ns
50%
ns
ns
7
ns
10
ns
250
ns
50%
ns
95
Master, Tx only
8
Master, Rx and Tx
4
Slave, Rx only
8
Slave, Rx and Tx
4
ns
MHz
t1
SCK
t3
t2
SSN
MO
(Master Out,
Slave In)
t7
t4
MI
(Master In,
Slave Out)
t5
t6
T0439-01
Figure 2. SPI AC Characteristics
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DEBUG INTERFACE AC CHARACTERISTICS
TA = –40°C to 125°C, VDD = 2 V to 3.6 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
12
MHz
fclk_dbg
Debug clock frequency (see Figure 3)
t1
Allowed high pulse on clock (see Figure 3)
35
ns
t2
Allowed low pulse on clock (see Figure 3)
35
ns
t3
EXT_RESET_N low to first falling edge on
debug clock (see Figure 4)
167
ns
t4
Falling edge on clock to EXT_RESET_N high
(see Figure 4)
83
ns
t5
EXT_RESET_N high to first debug command
(see Figure 4)
83
ns
t6
Debug data setup (see Figure 5)
2
ns
t7
Debug data hold (see Figure 5)
4
t8
Clock-to-data delay (see Figure 5)
Load = 10 pF
ns
30
ns
Time
DEBUG_ CLK
P2_2
t1
t2
1/fclk_dbg
T0436-01
Figure 3. Debug Clock – Basic Timing
Time
DEBUG_ CLK
P2_2
RESET_N
t3
t4
t5
T0437-01
Figure 4. Data Setup and Hold Timing
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Time
DEBUG_ CLK
P2_2
DEBUG_DATA
(to CC2531)
P2_1
DEBUG_DATA
(from CC2531)
P2_1
t6
t8
t7
T0438-01
Figure 5. Debug Enable Timing
TIMER INPUTS AC CHARACTERISTICS
TA = –40°C to 125°C, VDD = 2 V to 3.6 V, unless otherwise noted.
PARAMETER
Input capture pulse duration
TEST CONDITIONS
MIN
Synchronizers determine the shortest input pulse that can be
recognized. The synchronizers operate at the current system
clock rate (16 or 32 MHz).
TYP
MAX
UNIT
tSYSCLK
1.5
DC CHARACTERISTICS
TA = 25°C, VDD = 3 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
Logic-0 input voltage
Logic-1 input voltage
MAX
UNIT
0.5
V
2.5
V
Logic-0 input current
Input equals 0 V
–50
50
nA
Logic-1 input current
Input equals VDD
–50
50
nA
I/O-pin pullup and pulldown resistors
20
Logic-0 output voltage, 4-mA pins
Output load 4 mA
Logic-1 output voltage, 4-mA pins
Output load 4 mA
Logic-0 output voltage, 20-mA pins
Output load 20 mA
Logic-1 output voltage, 20-mA pins
Output load 20 mA
kΩ
0.5
2.4
V
V
0.5
2.4
V
V
USB INTERFACE DC CHARACTERISTICS
TA = 25°C, VDD = 3.0 V to 3.6 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
USB pad voltage output high
VDD 3.6 V, 4 mA load
3.4
V
USB pad voltage output low
VDD 3.6 V, 4 mA load
0.2
V
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DEVICE INFORMATION
DVDD1
P1_6
P1_7
P2_0
P2_1
P2_2
P2_3/XOSC32K_Q2
P2_4/XOSC32K_Q1
40
39
38
37
36
35
34
33
32
AVDD6
DCOUPL
RHA PACKAGE
(TOP VIEW)
31
30
RBIAS
2
29
AVDD4
1
USB_P
USB_N
3
28
AVDD1
DVDD_USB
4
27
AVDD2
P1_5
5
26
RF_N
P1_4
6
25
RF_P
P1_3
7
24
AVDD3
P1_2
8
23
XOSC_Q2
9
DGND_USB
22
XOSC_Q1
14
15
16
17
18
19
P0_4
P0_3
P0_2
P0_1
P0_0
21
20
AVDD5
RESET_N
13
P0_5
12
P0_6
10
11
P0_7
DVDD2
P1_0
P1_1
GND
Ground Pad
NOTE: The exposed ground pad must be connected to a solid ground plane, as this is the ground connection for the chip.
Pin Descriptions
PIN NAME
PIN
PIN TYPE
DESCRIPTION
AVDD1
28
Power (analog)
2-V–3.6-V analog power-supply connection
AVDD2
27
Power (analog)
2-V–3.6-V analog power-supply connection
AVDD3
24
Power (analog)
2-V–3.6-V analog power-supply connection
AVDD4
29
Power (analog)
2-V–3.6-V analog power-supply connection
AVDD5
21
Power (analog)
2-V–3.6-V analog power-supply connection
AVDD6
31
Power (analog)
2-V–3.6-V analog power-supply connection
DCOUPL
40
Power (digital)
1.8-V digital power-supply decoupling. Do not use for supplying external circuits.
DVDD1
39
Power (digital)
2-V–3.6-V digital power-supply connection
DVDD2
10
Power (digital)
2-V–3.6-V digital power-supply connection
GND
—
Ground
The ground pad must be connected to a solid ground plane.
DGND_USB
1
Ground (USB
Pads)
USB Ground
USB_P
2
USB I/O
USB Differential Data Plus (D+)
USB_N
3
USB I/O
USB Differential Data Minus (D-)
DVDD_USB
4
Power (USB
Pads)
3.3V USB power supply connection
P0_0
19
Digital I/O
Port 0.0
P0_1
18
Digital I/O
Port 0.1
P0_2
17
Digital I/O
Port 0.2
14
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Pin Descriptions (continued)
PIN NAME
PIN
PIN TYPE
DESCRIPTION
P0_3
16
Digital I/O
Port 0.3
P0_4
15
Digital I/O
Port 0.4
P0_5
14
Digital I/O
Port 0.5
P0_6
13
Digital I/O
Port 0.6
P0_7
12
Digital I/O
Port 0.7
P1_0
11
Digital I/O
Port 1.0 – 20-mA drive capability
P1_1
9
Digital I/O
Port 1.1 – 20-mA drive capability
P1_2
8
Digital I/O
Port 1.2
P1_3
7
Digital I/O
Port 1.3
P1_4
6
Digital I/O
Port 1.4
P1_5
5
Digital I/O
Port 1.5
P1_6
38
Digital I/O
Port 1.6
P1_7
37
Digital I/O
Port 1.7
P2_0
36
Digital I/O
Port 2.0
P2_1
35
Digital I/O
Port 2.1
P2_2
34
Digital I/O
Port 2.2
P2_3/
XOSC32K_Q2
33
Digital I/O,
Analog I/O
Port 2.3/32.768 kHz XOSC
P2_4/
XOSC32K_Q1
32
Digital I/O,
Analog I/O
Port 2.4/32.768 kHz XOSC
RBIAS
30
Analog I/O
External precision bias resistor for reference current
RESET_N
20
Digital input
Reset, active-low
RF_N
26
RF I/O
Negative RF input signal to LNA during RX
Negative RF output signal from PA during TX
RF I/O
Positive RF input signal to LNA during RX
Positive RF output signal from PA during TX
RF_P
25
XOSC_Q1
22
Analog I/O
32-MHz crystal oscillator pin 1 or external-clock input
XOSC_Q2
23
Analog I/O
32-MHz crystal oscillator pin 2
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CIRCUIT DESCRIPTION
VDD (2.0 - 3.6 V)
ON-CHIP VOLTAGE
REGULATOR
RESET_N
RESET
XOSC_Q2
SLEEP TIMER
CLOCK MUX &
CALIBRATION
32.768 kHz
CRYSTAL OSC
P2_4
P2_3
P2_2
POWER MGT. CONTROLLER
1 KB
FIFO SRAM
DEBUG
INTERFACE
P2_1
POWER ON RESET
BROWN OUT
WATCHDOG TIMER
32 MHz
CRYSTAL OSC
XOSC_Q1
DCOUPL
HIGH SPEED
RC-OSC
32 kHz
RC-OSC
USB
USB PHY
DP
DM
P2_0
8 KB
SRAM
P1_7
8051 CPU
CORE
P1_6
P1_5
MEMORY
ARBITER
P1_4
256 KB FLASH
P1_3
P1_2
DMA
P1_1
P1_0
P0_4
P0_3
P0_2
P0_1
P0_0
12-bit !"
ADC
AES
ENCRYPTION
&
DECRYPTION
RADIO REGISTERS
CSMA/CA STROBE PROCESSOR
RADIO DATA INTERFACE
DEMODULATOR
&
AGC
MODULATOR
USART 0
TIMER 1 (16-bit)
TIMER 2
(IEEE 802.15.4 MAC TIMER)
RECEIVE
TIMER 3 (8-bit)
FREQUENCY
SYNTHESIZER
USART 1
FIFO AND FRAME CONTROL
P0_5
FLASH CTRL
SYNTH
P0_6
I/O CONTROLLER
P0_7
IRQ
CTRL
TRANSMIT
TIMER 4 (8-bit)
DIGITAL
RF_P RF_N
ANALOG
MIXED
Figure 6. CC2531 Block Diagram
A block diagram of the CC2531 is shown in Figure 6. The modules can be roughly divided into one of three
categories: CPU- and memory-related modules; modules related to peripherals, clocks, and power management;
and radio-related modules. In the following subsections, a short description of each module that appears in
Figure 6 is given.
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For more details about the modules and their usage, see the corresponding chapters in the CC253x User's
Guide (SWRU191).
CPU and Memory
The 8051 CPU core used in the CC253x device family is a single-cycle 8051-compatible core. It has three
different memory-access buses (SFR, DATA and CODE/XDATA) with single-cycle access to SFR, DATA, and
the main SRAM. It also includes a debug interface and an 18-input extended interrupt unit.
The interrupt controller services a total of 18 interrupt sources, divided into six interrupt groups, each of which
is associated with one of four interrupt priorities. Any interrupt service request is serviced also when the device is
in idle mode by going back to active mode. Some interrupts can also wake up the device from sleep mode
(power modes 1–3).
The memory arbiter is at the heart of the system, as it connects the CPU and DMA controller with the physical
memories and all peripherals through the SFR bus. The memory arbiter has four memory access points, access
of which can map to one of three physical memories: an 8-KB SRAM, flash memory, and XREG/SFR registers. It
is responsible for performing arbitration and sequencing between simultaneous memory accesses to the same
physical memory.
The 8-KB SRAM maps to the DATA memory space and to parts of the XDATA memory spaces. The 8-KB
SRAM is an ultralow-power SRAM that retains its contents even when the digital part is powered off (power
modes 2 and 3). This is an important feature for low-power applications.
The 256 KB flash block provides in-circuit programmable non-volatile program memory for the device, and
maps into the CODE and XDATA memory spaces. In addition to holding program code and constants, the
non-volatile memory allows the application to save data that must be preserved such that it is available after
restarting the device. Using this feature one can, e.g., use saved network-specific data to avoid the need for a full
start-up and network find-and-join process .
Clocks and Power Management
The digital core and peripherals are powered by a 1.8-V low-dropout voltage regulator. It provides power
management functionality that enables low power operation for long battery life using different power modes.
Five different reset sources exist to reset the device.
Peripherals
The CC2531 includes many different peripherals that allow the application designer to develop advanced
applications.
The debug interface implements a proprietary two-wire serial interface that is used for in-circuit debugging.
Through this debug interface, it is possible to perform an erasure of the entire flash memory, control which
oscillators are enabled, stop and start execution of the user program, execute supplied instructions on the 8051
core, set code breakpoints, and single-step through instructions in the code. Using these techniques, it is
possible to perform in-circuit debugging and external flash programming elegantly.
The device contains flash memory for storage of program code. The flash memory is programmable from the
user software and through the debug interface. The flash controller handles writing and erasing the embedded
flash memory. The flash controller allows page-wise erasure and 4-bytewise programming.
The I/O controller is responsible for all general-purpose I/O pins. The CPU can configure whether peripheral
modules control certain pins or whether they are under software control, and if so, whether each pin is configured
as an input or output and if a pullup or pulldown resistor in the pad is connected. CPU interrupts can be enabled
on each pin individually. Each peripheral that connects to the I/O pins can choose between two different I/O pin
locations to ensure flexibility in various applications.
A versatile five-channel DMA controller is available in the system, accesses memory using the XDATA memory
space, and thus has access to all physical memories. Each channel (trigger, priority, transfer mode, addressing
mode, source and destination pointers, and transfer count) is configured with DMA descriptors anywhere in
memory. Many of the hardware peripherals (AES core, flash controller, USARTs, timers, ADC interface) achieve
highly efficient operation by using the DMA controller for data transfers between SFR or XREG addresses and
flash/SRAM.
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Timer 1 is a 16-bit timer with timer/counter/PWM functionality. It has a programmable prescaler, a 16-bit period
value, and five individually programmable counter/capture channels, each with a 16-bit compare value. Each of
the counter/capture channels can be used as a PWM output or to capture the timing of edges on input signals. It
can also be configured in IR Generation Mode where it counts Timer 3 periods and the output is ANDed with
the output of Timer 3 to generate modulated consumer IR signals with minimal CPU interaction.
The MAC timer (Timer 2) is specially designed for supporting an IEEE 802.15.4 MAC or other time-slotted
protocol in software. The timer has a configurable timer period and an 8-bit overflow counter that can be used to
keep track of the number of periods that have transpired. A 16-bit capture register is also used to record the
exact time at which a start-of-frame delimiter is received/transmitted or the exact time at which transmission
ends, as well as a 16-bit output compare register that can produce various command strobes (start RX, start TX,
etc.) at specific times to the radio modules.
Timer 3 and Timer 4 are 8-bit timers with timer/counter/PWM functionality. They have a programmable
prescaler, an 8-bit period value, and one programmable counter channel with an 8-bit compare value. Each of
the counter channels can be used as a PWM output.
The sleep timer is an ultralow-power timer that counts 32-kHz crystal oscillator or 32-kHz RC oscillator periods.
The sleep timer runs continuously in all operating modes except power mode 3. Typical applications of this timer
are as a real-time counter or as a wake-up timer to get out of power mode 1 or 2.
The ADC supports 7 to 12 bits of resolution in a 30 kHz to 4 kHz bandwidth, respectively. DC and audio
conversions with up to eight input channels (Port 0) are possible. The inputs can be selected as single-ended or
differential. The reference voltage can be internal, AVDD, or a single-ended or differential external signal. The
ADC also has a temperature-sensor input channel. The ADC can automate the process of periodic sampling or
conversion over a sequence of channels.
The random-number generator uses a 16-bit LFSR to generate pseudorandom numbers, which can be read by
the CPU or used directly by the command strobe processor. The random numbers can, e.g., be used to generate
random keys used for security.
The AES encryption/decryption core allows the user to encrypt and decrypt data using the AES algorithm with
128-bit keys. The core is able to support the AES operations required by IEEE 802.15.4 MAC security, the
ZigBee network layer, and the application layer.
A built-in watchdog timer allows the CC2531 to reset itself in case the firmware hangs. When enabled by
software, the watchdog timer must be cleared periodically; otherwise, it resets the device when it times out. It can
alternatively be configured for use as a general 32-kHz timer.
USART 0 and USART 1 are each configurable as either a SPI master/slave or a UART. They provide double
buffering on both RX and TX and hardware flow control and are thus well suited to high-throughput full-duplex
applications. Each has its own high-precision baud-rate generator, thus leaving the ordinary timers free for other
uses.
The USB device operates at Full-Speed, 12 Mbps transfer rate. The controller has 5 bi-directional endpoints in
addition to control endpoint 0. The endpoints support Bulk, Interrupt, and Isochronous operation for
implementation of a wide range of applications. The 1024 bytes of dedicated, flexible FIFO memory combined
with DMA access ensures that a minimum of CPU involvement is needed for USB communication.
Radio
The CC2531 features an IEEE 802.15.4-compliant radio transceiver. The RF core controls the analog radio
modules. In addition, it provides an interface between the MCU and the radio which makes it possible to issue
commands, read status, and automate and sequence radio events. The radio also includes a packet-filtering and
address-recognition module.
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TYPICAL CHARACTERISTICS
RX CURRENT (–100 dBm INPUT)
vs
TEMPERATURE
TX CURRENT (TXPOWER = 0xF5)
vs
TEMPERATURE
36
28
27
26
TX Current − mA
RX Current − mA
35
25
24
34
33
23
22
−40
0
40
80
32
−40
120
0
40
80
T − Temperature − °C
G002
Figure 7.
Figure 8.
RX CURRENT (–100 dBm INPUT)
vs
SUPPLY VOLTAGE
TX CURRENT (TXPOWER = 0xF5)
vs
SUPPLY VOLTAGE
26.0
34.4
25.5
34.2
TX Current − mA
RX Current − mA
G001
25.0
24.5
24.0
2.0
120
T − Temperature − °C
34.0
33.8
2.4
2.8
3.2
VCC − Supply Voltage − V
3.6
33.6
2.0
G003
Figure 9.
2.4
2.8
3.2
VCC − Supply Voltage − V
3.6
G004
Figure 10.
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TYPICAL CHARACTERISTICS (continued)
INTERFERER REJECTION (802.15.4 INTERFERER)
vs
INTERFERER FREQUENCY (CARRIER AT –82 dBm, 2440
MHz)
75
OUTPUT POWER (TXPOWER = 0xF5)
vs
FREQUENCY
6.0
50
Interferer Rejection − dB
PO − Output Power − dBm
5.5
5.0
4.5
25
0
4.0
3.5
2394
2414
2434
2454
2474
−25
2400
2494
f − Frequency − MHz
2420
2440
2460
2480
Interferer Frequency − MHz
G005
G006
Figure 11.
Figure 12.
SENSITIVITY
vs
TEMPERATURE
OUTPUT POWER (TXPOWER = 0xF5)
vs
TEMPERATURE
8
−92
−93
PO − Output Power − dBm
6
Sensitivity − dBm
−94
−95
−96
−97
4
2
0
−98
−99
−40
0
40
80
120
−2
−40
T − Temperature − °C
0
40
G007
Figure 13.
20
80
120
T − Temperature − °C
G008
Figure 14.
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TYPICAL CHARACTERISTICS (continued)
OUTPUT POWER (TXPOWER = 0xF5)
vs
SUPPLY VOLTAGE
SENSITIVITY
vs
SUPPLY VOLTAGE
5.0
−94
−95
Sensitivity − dBm
PO − Output Power − dBm
4.8
4.6
4.4
−96
−97
−98
4.2
−99
4.0
2.0
2.4
2.8
3.2
VCC − Supply Voltage − V
−100
2.0
3.6
2.4
2.8
3.2
VCC − Supply Voltage − V
G009
Figure 15.
3.6
G010
Figure 16.
Table 1. Recommended Output Power Settings (1)
(1)
TXPOWER Register Setting
Typical Output Power (dBm)
Typical Current Consumption (mA)
0xF5
4.5
34
0xE5
2.5
31
0xD5
1
29
0xC5
–0.5
28
0xB5
–1.5
27
0xA5
–3
27
0x95
–4
26
0x85
–6
26
0x75
–8
25
0x65
–10
25
0x55
–12
25
0x45
–14
25
0x35
–16
25
0x25
–18
24
0x15
–20
24
0x05
–22
23
0x05 and TXCTRL = 0x09
–28
23
Measured on Texas Instruments CC2530 EM reference design with TA = 25°C, VDD = 3 V and fc = 2440 MHz, unless otherwise noted.
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APPLICATION INFORMATION
Few external components are required for the operation of the CC2531. A typical application circuit is shown in
Figure 17. For a complete USB certified reference design, see the CC2531 product page on www.ti.com. Typical
values and description of external components are shown in Table 2. The USB_P and USB_N pins need series
resistors R21 and R31 for impedance matching and the D+ line must have a pull-up resistor, R32. The series
resistors should match the 90 Ω ±15% characteristic impedance of the USB bus. Notice that the pull-up resistor
and the DVDD_USB must be connected to a voltage source between 3 and 3.6 V (typically 3.3 V). The voltage
source should be derived from or controlled by the VBUS power supply provided by the USB cable. In this way,
the pull-up resistor does not provide current to the D+ line when VBUS is removed. The pull-up resistor may be
connected directly between VBUS and the D+ line. As an alternative, if the CC2531 firmware needs the ability to
disconnect from the USB bus, a GPIO on the CC2531 can be used to control the pull-up resistor.
2.0V - 3.6V power supply
3.3V power supply
Optional 32kHz crystal
C331
XTAL
C401
D+
2 USB_P
C41
D-
A VDD6 31
P2_3/XOS C32K _Q2 33
P 2_1 35
P 2_2 34
P 2_0 36
P 1_6 38
P 1_7 37
1 DGND_USB
R31
P2_4/XOS C32K _Q1 32
R32
DVDD1 39
DCOUPL 40
C321
C254
RF_N 26
6 P1_4
C261
RF_P 25
DIE ATTACH PAD :
7 P1_3
XOSC_Q1 22
18 P 0_1
19 P 0_0
17 P 0_2
16 P 0_3
15 P 0_4
14 P 0_5
13 P 0_6
10 DVDD2_
20 RES ET_N
XOSC_Q2 23
9 P1 1
12 P 0_7
L261
AVDD 3 24
8 P1_2
11 P 1_0
C252
AVDD 2 27
CC2531
5 P1_5
C21
C251
AVDD 1 28
4 DVDD_USB
C31
Antenna
(50 Ohm)
L252
AVDD 4 29
3 USB_N
R21
R301
RBIAS 30
C262
C253
C255
AVDD 5 21
XTAL
C221
C231
Power supply decoupling capacitors are not shown. Digital I / O not connected.
Figure 17. CC2531 Application Circuit
22
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CC2531
www.ti.com ........................................................................................................................................................................................ SWRS086 – SEPTEMBER 2009
Table 2. Overview of External Components (Excluding Supply Decoupling
Capacitors)
Component
Description
Value
C251
Part of the RF matching network
18 pF
C261
Part of the RF matching network
18 pF
L252
Part of the RF matching network
2 nH
L261
Part of the RF matching network
2 nH
C262
Part of the RF matching network
1 pF
C252
Part of the RF matching network
1 pF
C253
Part of the RF matching network
2.2 pF
C331
32kHz xtal loading capacitor
15 pF
C321
32kHz xtal loading capacitor
15 pF
C231
32MHz xtal loading capacitor
27 pF
C221
32MHz xtal loading capacitor
27 pF
C401
Decoupling capacitor for the internal digital regulator
R301
Resistor used for internal biasing
56 kΩ
C41
Decoupling capacitor for USB pad power supply
10 pF
C21
USB D- decoupling
47 pF
C31
USB D+ decoupling
47 pF
R21
USB D- series resistor
33 Ω
R31
USB D+ series resistor
R32
USB D+ pull-up resistor to signal Full Speed Device
1 µF
33 Ω
1.5 kΩ
Input/Output Matching
When using an unbalanced antenna such as a monopole, a balun should be used to optimize performance. The
balun can be implemented using low-cost discrete inductors and capacitors. The recommended balun shown
consists of C262, L261, C252, and L252.
If a balanced antenna such as a folded dipole is used, the balun can be omitted.
Crystal
An external 32-MHz crystal, XTAL1, with two loading capacitors (C221 and C231) is used for the 32-MHz crystal
oscillator. See the 32-MHz Crystal Oscillator section for details. The load capacitance seen by the 32-MHz
crystal is given by:
1
+ Cparasitic
CL =
1
1
+
C221 C231
(1)
XTAL2 is an optional 32.768-kHz crystal, with two loading capacitors (C321 and C331) used for the 32.768-kHz
crystal oscillator. The 32.768-kHz crystal oscillator is used in applications where both low sleep-current
consumption and accurate wake-up times are needed. The load capacitance seen by the 32.768-kHz crystal is
given by:
1
+ Cparasitic
CL =
1
1
+
C321 C331
(2)
A series resistor may be used to comply with the ESR requirement.
On-Chip 1.8-V Voltage-Regulator Decoupling
The 1.8-V on-chip voltage regulator supplies the 1.8-V digital logic. This regulator requires a decoupling capacitor
(C401) for stable operation.
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CC2531
SWRS086 – SEPTEMBER 2009 ........................................................................................................................................................................................ www.ti.com
Power-Supply Decoupling and Filtering
Proper power-supply decoupling must be used for optimum performance. The placement and size of the
decoupling capacitors and the power supply filtering are important to achieve the best performance in an
application. TI provides a recommended compact reference design for the user to follow.
References
1. IEEE Std. 802.15.4-2006: Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specifications
for Low-Rate Wireless Personal Area Networks (LR-WPANs)
http://standards.ieee.org/getieee802/download/802.15.4-2006.pdf
2. CC253x User's Guide – CC253x System-on-Chip Solution for 2.4 GHz IEEE 802.15.4 and ZigBee
Applications (SWRU191)
3. Universal Serial Bus Revision 2.0 Specification http://www.usb.org/developers/docs/usb_20_052709.zip
Additional Information
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Texas Instruments’ Low-Power RF Web site has all the latest products, application and design notes, FAQ
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Join at: www.ti.com/lprf-forum.
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www.ti.com ........................................................................................................................................................................................ SWRS086 – SEPTEMBER 2009
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PACKAGE OPTION ADDENDUM
www.ti.com
5-Oct-2009
PACKAGING INFORMATION
Orderable Device
Status (1)
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
CC2531F256RHAR
ACTIVE
QFN
RHA
40
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-3-260C-168 HR
CC2531F256RHAT
ACTIVE
QFN
RHA
40
250
CU NIPDAU
Level-3-260C-168 HR
Green (RoHS &
no Sb/Br)
Lead/Ball Finish
MSL Peak Temp (3)
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
Addendum-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
1-Oct-2009
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
B0
(mm)
K0
(mm)
P1
(mm)
W
Pin1
(mm) Quadrant
CC2531F256RHAR
QFN
RHA
40
2500
330.0
16.4
6.3
6.3
1.5
12.0
16.0
Q2
CC2531F256RHAT
QFN
RHA
40
250
330.0
16.4
6.3
6.3
1.5
12.0
16.0
Q2
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
1-Oct-2009
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
CC2531F256RHAR
QFN
RHA
40
2500
333.2
345.9
28.6
CC2531F256RHAT
QFN
RHA
40
250
333.2
345.9
28.6
Pack Materials-Page 2
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