User's Manual

DFZM-TS2xx
Data Sheet Sheet 13 of 37 AUG 22, 2013
Proprietary Information and Specifications are Subject to Change
3-3.Power Management
Different operating modes, or power modes, are used to allow low-power operation. Ultralow-power operation is
obtained by turning off the power supply to modules to avoid static (leakage) power consumption and also by
using clock gating and turning off oscillators to reduce dynamic power consumption.
The five various operating modes (power modes) are called active mode, idle mode, PM1, PM2, and PM3
(PM1/PM2/PM3 are also referred to as sleep modes). Active mode is the normal operating mode, whereas PM3
has the lowest power consumption. The impact of the different power modes on system operation is shown in
Table 3-2, together with voltage regulator and oscillator options.
Power Mode High-Frequency Oscillator Low-Frequency Oscillator Vlotage Regulator (Digital)
Configuration A: 32MHz XOSC
B: 16MHz RCOSC
C: 32KHz XOSC
D: 32KHz RCOSC
Active/idle mode A or B C or D ON
PM1 OFF ON ON
PM2 OFF ON OFF
PM2 OFF OFF OFF
Table 3-2: DFZM-TS2xx Power Management
Active mode: The fully functional mode of operation where the CPU, peripherals, and RF transceiver are active.
The voltage regulator to the digital core is on, and either the 16MHz RC oscillator or the 32MHz crystal oscillator
or both is running. Either the 32KHz RCOSC or the 32KHz XOSC is running.
Idle mode: Identical to active mode, except that the CPU core stops operating (is idle). All other peripherals
function normally, and any enabled interrupt wakes up the CPU core (to transition back from idle mode to active
mode).
PM1: The voltage regulator to the digital part is on. Neither the 32MHz XOSC nor the 16MHZ RCOSC is
running. Either the 32KHz RCOSC or 32KHz XOSC is running. When PM1 is entered, a power-down sequence
is run.
PM1 is used when the expected time until a wakeup event is relatively short (less than 3 ms), because PM1 uses a
fast power-down/up sequence.