Renesas RL78 Series User Manual page 635

RL78/G1D
(7) PLL
Based on the RF base clock, this generates the carrier frequency (2.4-GHz band) to be used in transmission and
reception, and supplies 4-phase signals which are each shifted by 90 degrees to MIX and single-ended and single-
phase signals to PA.
(8) PA
This power amplifier (PA) is a circuit located as the output stage of the transmission analog circuit unit. It amplifies
the electric power of the carriers (carrier waves) sent from the PLL and outputs them to the antenna. The output
power is Typ. +0 dBm (50-Ω load) in a 2.4-GHz band. The electric power of the GFSK modulated signals from the
PLL is amplified.
15.3.7 Power management block
The power management block consists of a DC-DC converter and a regulator.
(1) DC-DC converter
Equipped with a switching regulator that generates from the power supply (1.8 to 3.6 V) a stabilized power supply
for the internal power source.
Using or not using the DC-DC converter is selectable. Using the DC-DC converter allows power-saving operation.
Not using the DC-DC converter allows low-voltage operation (1.6 V) and reduces the cost of systems by reducing
the number of external components.
(2) Regulator
Six regulators generate stabilized power supply voltages for the digital circuits, ADC, oscillator, PLL, VCO, and RF
analog circuits from the external power supply (1.6 to 3.6 V).
15.3.8 Wakeup block
The wakeup block consists of a sleep timer and a power/reset control circuit.
(1) Sleep timer
This timer counts the periods of sleep in DEEP_SLEEP and SLEEP_RF mode in cycles of the RF slow clock.
(2) Power/reset control
Operation of the DC-DC converter and the 32-MHz oscillating circuit is stopped in DEEP_SLEEP mode. This circuit
controls the supply of power to the DC-DC converter and 32-MHz oscillating circuit and resetting of the baseband
unit when waking up from DEEP_SLEEP mode.
Operation of the DC-DC converter and the 32-MHz oscillating circuit is not stopped in SLEEP_RF mode. There is
thus no need to re-supply power to the DC-DC converter and 32-MHz oscillating circuit nor to reset the baseband
unit when waking up from SLEEP_RF mode.
R01UH0515EJ0120 Rev.1.20
Dec 16, 2016
CHAPTER 15 RF TRANSCEIVER
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