Datasheet

78K0/Ix2 CHAPTER 12 OPERATIONAL AMPLIFIER
R01UH0010EJ0500 Rev.5.00 400
Feb 28, 2012
CHAPTER 12 OPERATIONAL AMPLIFIER
78K0/IY2 78K0/IA2 78K0/IB2 Item
16 Pins 20 Pins 30 Pins 32 Pins
Operational amplifier (products with
operational amplifier only)
1 ch (PGA mode
only)
1 ch (Single AMP mode and PGA mode)
12.1 Function of Operational Amplifier
Operational amplifier is mounted onto products with operational amplifier of the 78K0/Ix2 microcontrollers. The
operational amplifier has the following modes.
 Single AMP mode
Note
Operational amplifier has two input pins (the AMP- pin and the AMP+ pin) and one output pin (the AMPOUT pin), and
can be used as single-power supply amplifier that can be externally connected.
The amplified voltage can be used as an analog input of the A/D converter, because the AMPOUT pin is alternatively
used with analog input pin of the A/D converter.
Note Products with operational amplifier of the 78K0/IA2, 78K0/IB2 only.
 PGA (Programmable gain amplifier) mode
In this mode, the analog voltage input from the PGAIN pin is amplified within the microcontroller. The gain can be
selected from four types (4, 8, 16, 32).
The amplified voltage can be used as an analog input of the A/D converter.