Opamp Function Descriptions - NXP Semiconductors MC9S08SU16 Reference Manual

winding's common neutral connection. The virtual neutral reference signal is generated
by selectively communicating signals received from each motor winding to a virtual
neutral circuit node.
Phase detection comparator is used to compare the virtual neutral and phase voltage
input. Its output is connected to a window/filter circuit which provides window
comparing and digital filter function.

25.7.2 OpAMP function descriptions

This section describes on-chip analog amplifies and over-limit protection comparators.
25.7.2.1 OpAMP diagram
The following figure shows the block diagram for the OpAMP.
To PWM FAULT2
To ADCA5 & ADCB5
To PWM FAULT3
To ADCA6 & ADCB6
NXP Semiconductors
VDDX
6Bit
DAC0
Logic 1
WINDOW
/SAMPLE
LIMT0CMP
LIMIT0[COUT]
Window and
Filter Control
VDDX
6Bit
DAC1
Logic 1
WINDOW
/SAMPLE
LIMT1CMP
LIMIT1[COUT]
Window and
Filter Control
Figure 25-3. OpAMP diagram
MC9S08SU16 Reference Manual, Rev. 5, 4/2017
Chapter 25 Gate Drive Unit (GDU)
VREFH VDDX
BIASSEL
VBIAS
R
D
VBIAS/2
BUF0
R
D
R
R
F
N
(128KΩ)
(6.4KΩ)
AMP0
R
N
(6.4KΩ)
R
F
VREFH VDDX (128KΩ)
BIASSEL
VBIAS
R
D
VBIAS/2
BUF1
R
D
R
R
F
N
(128KΩ)
(6.4KΩ)
AMP1
R
N
(6.4KΩ)
R
F
(128KΩ)
R0
AMP0P
R0
AMP0M
R1
AMP1P
R1
AMP1M
463