mfr4200 Freescale Semiconductor, Inc, mfr4200 Datasheet - Page 210

• Manufacturer Part Number: mfr4200
• Description: Flexray Communication Controllers
• Manufacturer: Freescale Semiconductor, Inc

Dual Output Voltage Regulator (VREG3V3V2)
4.2.3
Signals V
logic. These signals are connected to device pins to allow external decoupling capacitors (100 nF...220 nF,
X7R ceramic).
In shutdown mode an external supply at V
4.2.4
Signals V
oscillator. These signals are connected to device pins to allow external decoupling capacitors (100 nF...220
nF, X7R ceramic).
In shutdown mode an external supply at V
4.2.5
This optional signal is used to shutdown VREG3V3V2. In that case V
be provided externally. shutdown mode is entered with V
VREG3V3V2 is in reduced-power mode.
For the connectivity of V
4.3
Block VREG3V3V2 is a voltage regulator as depicted in
the regulator core (REG), a power-on reset module (POR) and a low-voltage reset module (LVR). There
is also the regulator control block (CTRL) which manages the operating modes of VREG3V3V2.
4.3.1
VREG3V3V2, respectively its regulator core has two parallel, independent regulation loops (REG1 and
REG2) that differ only in the amount of current that can be sourced to the connected loads. Therefore, only
REG1 providing the supply at V
The regulator is a linear series regulator with a bandgap reference in its full-performance mode and a
voltage clamp in reduced-power mode. All load currents flow from input V
reference circuits are connected to V
4.3.2
In full-performance mode, a fraction of the output voltage (V
fed to an operational amplifier. The amplified input voltage difference controls the gate of an output driver.
210
DDOSC
DD
Functional Description
V
V
V
REG — Regulator Core
Full-performance Mode
/V
DD
DDOSC
REGEN
Switching from FPM or RPM to shutdown of VREG3V3V2 and vice versa
is not supported while the CC is powered.
SS
/V
, V
are the primary outputs of VREG3V3V2 that provide the power supply for the core
SSOSC
SS
, V
— Optional Regulator Enable
— Regulator Output1 (Core Logic)
REGEN
are the secondary outputs of VREG3V3V2 that provide the power supply for the
SSOSC
DD
see device overview chapter.
— Regulator Output2 (OSC)
/V
DDA
SS
MFR4200 Data Sheet, Rev. 0
is explained. The principle is also valid for REG2.
and V
DD
DDOSC
/V
SSA
SS
NOTE
/V
can replace the voltage regulator.
.
SSOSC
Figure
REGEN
can replace the voltage regulator.
DD
4-1. The regulator functional elements are
) and the bandgap reference voltage are
being low. If V
DD
/V
SS
DDR
and V
REGEN
to V
DDOSC
Freescale Semiconductor
SS
is high, the
or V
/V
SSOSC
SSOSC
, the
must