Datasheet
TPS659110, TPS659112, TPS659113, TPS659116
SWCS049L –JUNE 2010–REVISED MARCH 2014
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8.5 Dynamic Voltage Frequency Scaling And Adaptive Voltage Scaling Operation
Dynamic voltage frequency scaling (DVFS) operation: A supply voltage value corresponding to a targeted
frequency of the digital core supplied is programmed in VDD1_OP_REG or VDD2_OP_REG registers.
The slew rate of the voltage supply reaching a new VDD1_OP_REG or VDD2_OP_REG programmed value is
limited to 12.5 mV/µs, fixed value.
Adaptative voltage scaling (AVS) operation: A supply voltage value corresponding to a supply voltage adjustment
is programmed in VDD1_SR_REG or VDD2_SR_REG registers. The supply voltage is then intended to be tuned
by the digital core supplied, based its performance self-evaluation. The slew rate of VDD1 or VDD2 voltage
supply reaching a new programmed value is programmable though the VDD1_REG or VDD2_REG register,
respectively.
A serial control interface (optional mode for EN1 and EN2 pins) can be dedicated to voltage scaling applications,
to give dedicated access to the VDD1_OP_REG, VDD1_SR_REG and VDD2_OP_REG, VDD2_SR_REG
registers.
A general-purpose serial control interface (CTL-I
2
C) also gives access to these registers, if the
SR_CTL_I2C_SEL control bit is set to 1 in the DEVCTRL_REG register (default inactive).
Both control interfaces are compliant with HS-I
2
C specification (100 Kbps, 400 Kbps, or 3.4 Mbps).
8.6 32-kHz RTC Clock
The TPS65911 device can provide a 32-kHz clock to the platform through the CLK32KOUT output, when a
crystal is connected.
Alternatively, the device can accept a square-wave 32-kHz clock signal applied to OSC32IN input (OSC32KOUT
kept floating) and gate the clock to CLK32OUT. This clock must be present for any state of the EPC except the
NO SUPPLY state. The TPS65911 device also has an 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 configuration setting for the CK32K_CTRL bit.
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 the DEVCTRL_REG register.
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