CC2544 Datasheet, PDF (7/30 Pages) Texas Instruments – System-on-Chip for 2.4-GHz USB Applications

CC2544
www.ti.com
SWRS103D – JUNE 2011 – REVISED MAY 2012
32-MHz CRYSTAL OSCILLATOR
Measured on Texas Instruments CC2544EM reference design with T_A = 25°C, VDD = 3.3 V, VBUS tied to 5 V, unless
otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Crystal frequency
32
MHz
Crystal frequency accuracy
requirement
2-Mbps data rate
–60
60
ppm
Equivalent series resistance
6
60
Ω
Crystal shunt capacitance
1
7
pF
Crystal load capacitance
10
16
pF
Start-up time
0.25
ms
The crystal oscillator must be in power down for a guard
Power-down guard time
time before it is used again. This requirement is valid for
all modes of operation. The need for power-down guard
3
ms
time can vary with crystal type and load.
32-kHz RC OSCILLATOR
Measured on Texas Instruments CC2544EM reference design with T_A = 25°C, VDD = 3.3 V, VBUS tied to 5 V, unless
otherwise noted.
PARAMETER
Calibrated frequency⁽¹⁾
TEST CONDITIONS
MIN
TYP
MAX
32.753
UNIT
kHz
Frequency accuracy after calibration
Temperature coefficient⁽²⁾
Supply-voltage coefficient⁽³⁾
Calibration time⁽⁴⁾
±0.2%
0.4
3
2
%/ºC
%/V
ms
(1) The calibrated 32-kHz RC oscillator frequency is the 32-MHz XTAL frequency divided by 977.
(2) Frequency drift when temperature changes after calibration
(3) Frequency drift when supply voltage changes after calibration
(4) The 32-kHz RC oscillator is calibrated when a switch from the 16-MHz RC oscillator to the 32-MHz crystal oscillator is performed, while
SLEEPCMD.OSC32K_CALDIS is set to 0.
16-MHz RC OSCILLATOR
Measured on Texas Instruments CC2544EM reference design with T_A = 25°C, VDD = 3.3 V, VBUS tied to 5 V, unless
otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Calibrated frequency
16
MHz
Uncalibrated frequency accuracy
Frequency accuracy after calibration⁽¹⁾
±18%
±0.6%
Start-up time
10
µs
Initial calibration time
50
µs
(1) The calibrated 16-MHz RC oscillator frequency is the 32-MHz XTAL frequency divided by 2.
Copyright © 2011–2012, Texas Instruments Incorporated
Product Folder Link(s): CC2544
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