Datasheet

X1 X2
CONCERTO DEVICE
CRYSTAL
X1 X2
CONCERTO DEVICE
X1 X2
CONCERTO DEVICE
3.3V
OUTVDD
GND
CLK
R
D
C
L2
C
L1
RESONATOR
3.3V OSCILLATOR
NC
v
ssosc
XCLKIN
CONCERTO DEVICE
3.3V
OUTVDD
GND
CLK
3.3V OSCILLATOR
v
ssosc
v
ssosc
NC
F28M36P63C, F28M36P53C, F28M36H53C, F28M36H53B, F28M36H33C, F28M36H33B
www.ti.com SPRS825C –OCTOBER 2012–REVISED FEBRUARY 2014
3.10 Input Clocks and PLLs
Concerto devices have multiple input clock pins from which all internal clocks and the output clock are
derived. Figure 3-7 shows the recommended methods of connecting crystals, resonators, and oscillators
to pins X1/X2 and XCLKIN.
Figure 3-7. Connecting Input Clocks to a Concerto Device
3.10.1 Internal Oscillator (Zero-Pin)
Each Concerto device contains a zero-pin internal oscillator. This oscillator outputs two fixed-frequency
clocks: 10MHZCLK and 32KHZCLK. These clocks are not configurable by the user and should not be
used to clock the device during normal operation. They are used inside the Master Subsystem to
implement low-power modes. The 10MHZCLK is also used by the Missing Clock Detect circuit.
Copyright © 2012–2014, Texas Instruments Incorporated Device Overview 45
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