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TPS65921 Datasheet(PDF) 39 Page - Texas Instruments

Part # TPS65921
Description  TPS65921 Power Management and USB Single Chip
PDF  70 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

TPS65921 Datasheet(HTML) 39 Page - Texas Instruments

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HFCLKOUT
32
KCLKOUT
HFCLKIN
OR
OR
32 kHz
SWCS048-011
32
KXIN
32
KXOUT
Device
OR
TPS65921
www.ti.com
SWCS048G – MARCH 2010 – REVISED SEPTEMBER 2014
5.2
Clock System
Figure 5-2 shows the TPS65921 clock overview.
Figure 5-2. TPS65921 Clock Overview
The TPS65921 accepts two sources of high-stability clock signals:
•
32KXIN/32KXOUT: on-board 32-kHz crystal oscillator (optionally, an external 32-kHz input clock can
be provided)
•
HFCLKIN: an external high-frequency clock (19.2, 26, or 38.4 MHz)
The TPS65921 has the capability to provide:
•
32KCLKOUT digital output clock
•
HFCLKOUT digital output clock with the same frequency as HFCLKIN input clock
5.3
32-kHz Oscillator
It is possible to use the 32-kHz input clock with either an external crystal or clock source. There are four
configuration, one with the external crystal and three without.
•
An external 32.768-kHz crystal connected on the 32KXIN / 32KXOUT balls. This configuration is
available for the master mode only.
•
A square- or sine-wave input can be applied to the 32KXIN pin with amplitude of 1.85 or 1.8 V. The
32KXOUT pin can be driven to a dc value of the square- or sine-wave amplitude divided by 2. This
configuration is recommended if a large load is applied on the 32KXOUT pin.
•
A square- or sine-wave input can be applied to the 32KXIN pin with amplitude of 1.85 or 1.8 V. The
32KXOUT pin can be left floating. This configuration is used if no charge is applied on the 32KXOUT
pin.
•
The oscillator is in bypass mode and a square-wave input can be applied to the 32KXIN pin with
amplitude of 1.8 V. The 32KXOUT pin can be left floating. This configuration is used if the oscillator is
in bypass mode (default configuration in Slave mode).
Figure 5-3 shows the block diagram for the 32.768-kHz clock output.
Copyright © 2010–2014, Texas Instruments Incorporated
Detailed Description
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Product Folder Links: TPS65921



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