CC2538_15 Datasheet, PDF (15/33 Pages) Texas Instruments – Powerful Wireless Microcontroller System-On-Chip

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CC2538
SWRS096D – DECEMBER 2012 – REVISED APRIL 2015
5.11 16-MHz RC Oscillator
Measured on TI's CC2538 EM reference design with T_A = 25°C and V_DD = 3 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN TYP
Frequency ⁽¹⁾
16
MAX UNIT
MHz
Uncalibrated frequency accuracy
±18%
Calibrated frequency accuracy
±0.6% ±1%
Start-up time
Initial calibration time⁽²⁾
10 µs
50
µs
(1) The calibrated 16-MHz RC oscillator frequency is the 32-MHz xtal frequency divided by 2.
(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.
5.12 RSSI/CCA Characteristics
Measured on TI's CC2538 EM reference design with T_A = 25°C and V_DD = 3 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN TYP
RSSI range
100
Absolute uncalibrated RSSI/CCA
accuracy
±4
RSSI/CCA offset⁽¹⁾
73
Step size (LSB value)
1
(1) Real RSSI = Register value – offset
MAX
UNIT
dB
dB
dB
dB
5.13 FREQEST Characteristics
Measured on TI's CC2538 EM reference design with T_A = 25°C and V_DD = 3 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN TYP
FREQEST range
±250
FREQEST accuracy
±10
FREQEST offset⁽¹⁾
15
Step size (LSB value)
7.8
(1) Real FREQEST = Register value – offset
MAX
UNIT
kHz
kHz
kHz
kHz
5.14 Frequency Synthesizer Characteristics
Measured on TI's CC2538 EM reference design with T_A = 25°C, V_DD = 3 V and f_c = 2440 MHz, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
At ±1-MHz offset from carrier
–111
Phase noise, unmodulated carrier At ±2-MHz offset from carrier
–119
dBc/Hz
At ±5-MHz offset from carrier
–126
5.15 Analog Temperature Sensor
Measured on TI's CC2538 EM reference design with T_A = 25°C and V_DD = 3 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN TYP
Output at 25°C
1422
Temperature coefficient
4.2
Voltage coefficient
1
Measured using integrated ADC, using
Initial accuracy without calibration
internal band-gap voltage reference and
±10
Accuracy using 1-point calibration (entire
temperature range)
maximum resolution
±5
Current consumption when enabled (ADC
current not included)
0.3
MAX
UNIT
12-bit ADC
/1°C
/0.1 V
°C
°C
mA
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Specifications
15