Detection Of Disconnection From The Resolver Sensor; Power-Up Sequences And Reset Operation - Renesas RAA3064002GFP User Manual

RAA3064002GFP/RAA3064003GFP
4.2

Detection of Disconnection from the Resolver Sensor

Connection of this IC to a resolver sensor can be detected by monitoring the levels of the internal signals. The selected
internal signal can be output through the MNTOUT pin to an A/D converter of the host MCU for detection of the signal
level.
For details on the detection of disconnection from the resolver sensor, see the application note Guide to Selecting
Peripheral Components for Use with the Resolver-to-Digital Converters (R03AN0012EJ).
4.3

Power-up Sequences and Reset Operation

This IC has three pairs of power supply pins: those for the analog circuits (AVDD and AVSS), for the constant-current
excitation circuit (EVDD and EVSS), and for the digital circuits (IOVDD and IOVSS). Connect them to a single power
source. Power to these pins should be turned on or off at the same time. The sequence following the release of the reset
signal varies with the type of reset. For the types of reset, see section 2.3.4, Control Block. Figure 4.5 shows the
sequence of the reset operation when power is turned on, and figure 4.6 shows the sequence of a reset while power is
being supplied. In the case of a reset by the signal on the RESET# pin, assertion should be over the time specified in the
electrical characteristics. The internal circuits of this IC are in the power-saving state following release from the reset
state. After release from the reset state, wait for the time required for the internal circuits to become stable, and release
this IC from the power-saving state by setting the internal power-saving control registers. Wait for another 30 ms before
using this IC.
Figure 4.7 shows the sequence of a reset on detection of the voltage falling to or below the specified level. This type of
reset is triggered on detection of an excessive drop in the power supply voltage. See section 5, Electrical Characteristics
for the voltage level that triggers a reset. Release from the reset state depends on the power supply voltage rising to the
required level. The internal circuits of this IC will also be in the power-saving state following release from this type of
reset. After release from the reset state, wait for the time required for the internal circuits to become stable, and release
this IC from the power-saving state by setting the internal power-saving control registers. Wait for another 30 ms before
using this IC.
Figure 4.8 shows the sequence of a software reset. A software reset is triggered by writing 1 to the SWRST register.
Release from the reset state is initiated by writing 0 to the SWRST register. After release from the reset, release this IC
from the power-saving state, and then wait for another 30 ms before using it.
R03UZ0002EJ0120 Rev.1.20
Apr 05, 2021
4. Operation
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