CC2564C Datasheet, PDF (15/52 Pages) Texas Instruments – CC2564C Dual-Mode Bluetooth Controller

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CC2564C
SWRS199A – APRIL 2016 – REVISED NOVEMBER 2016
5.8.2 Clock Specifications
5.8.2.1 Slow Clock Requirements
An external source must supply the slow clock and connect to the SLOW_CLK_IN pin (for example, the
host or external crystal oscillator). The source must be a digital signal in the range of 0 to 1.8 V. The
accuracy of the slow-clock frequency must be 32.768 kHz ±250 ppm for Bluetooth use (as specified in the
Bluetooth specification). The external slow clock must be stable within 64 slow-clock cycles (2 ms)
following the release of nSHUTD.
space
t_r and t_f
V_IH
V_IL
CHARACTERISTICS
Input slow-clock frequency
Input slow-clock accuracy
(Initial + temp + aging)
Input transition time t_r and t_f
(10% to 90%)
Frequency input duty cycle
Slow-clock input voltage limits
Input impedance
Input capacitance
CONDITION
Bluetooth
Square wave,
DC-coupled
MIN
TYP
32768
15%
0.65 × VDD_IO
0
1
50%
MAX
±250
UNIT
Hz
ppm
200
ns
85%
VDD_IO
0.35 × VDD_IO
5
V peak
V peak
MΩ
pF
5.8.2.2 External Fast Clock Crystal Requirements and Operation
space
CHARACTERISTICS
f_in
Supported crystal frequencies
Frequency accuracy
(Initial + temperature + aging)
Crystal oscillator negative resistance
CONDITION
26 MHz, external capacitance = 8 pF
I_osc = 0.5 mA
26 MHz, external capacitance = 20 pF
I_osc = 2.2 mA
MIN
TYP
MAX UNIT
26, 38.4
MHz
±20 ppm
650
940
Ω
490
710
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Specifications
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