Datasheet

Biasing
and
amplitude
control
32 kHz to
digital block
VRTC
OSC32KOUTOSC32KIN
SWCS046-013
REFGND
Q
Coscin
Coscout
TPS65910 , TPS65910A , TPS65910A3 , TPS659101
TPS659102 , TPS659103 , TPS659104 , TPS659105
TPS659106, TPS659107, TPS659108, TPS659109
SWCS046U –MARCH 2010–REVISED JUNE 2014 www.ti.com
6.4 32-kHz RTC Clock
The TPS65910 device can provide a 32-kHz clock to the platform through the CLK32KOUT output, the
source of this 32-kHz clock can be:
• 32-kHz crystal connected from OSC32IN to OSC32KOUT pins
• A square-wave 32-kHz clock signal applied to OSC32IN input (OSC32KOUT kept floating).
• Internal 32-kHz RC oscillator, to reduce the BOM, if an accurate clock is not needed by the system.
Default selection of a 32-kHz RC oscillator versus 32-kHz crystal oscillator or external square-wave 32-
kHz clock depends on the Boot mode or device version (EEPROM programming):
• BOOT1 = 0, BOOT0 = 1: quartz oscillator or external square wave 32-kHz clock default
• BOOT1 = 0, BOOT0 = 0: 32-kHz RC oscillator default
Switching from the 32-kHz RC oscillator to the 32-kHz crystal oscillator or external square-wave 32-kHz
clock can also be programmed though DEVCTRL_REG register, taking benefit of the shorter turn-on time
of the internal RC oscillator.
Switching from the 32-kHz crystal oscillator or external square-wave clock to the RC oscillator is not
supported.
Figure 6-3. Crystal Oscillator 32-kHz Clock
52 Detailed Description Copyright © 2010–2014, Texas Instruments Incorporated
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Product Folder Links: TPS65910 TPS65910A TPS65910A3 TPS659101 TPS659102 TPS659103 TPS659104
TPS659105 TPS659106 TPS659107 TPS659108 TPS659109