Datasheet

78K0/Kx2-L CHAPTER 13 OPERATIONAL AMPLIFIERS

R01UH0028EJ0400 Rev.4.00 434

Sep 27, 2010

CHAPTER 13 OPERATIONAL AMPLIFIERS

78K0/KY2-L

(

PD78F055x)

78K0/KA2-L

(

PD78F056x)

78K0/KB2-L

(

PD78F057x)

78K0/KC2-L

(

PD78F058x)

Item

16 Pins 20, 25, 32 Pins 30 Pins 40, 44, 48 Pins

Operational amplifier

(products with operational

amplifier only)

1 ch (operational amplifier 0) 2 ch (operational amplifiers 0 and 1)

13.1 Function of Operational Amplifier

Operational amplifiers 0 and 1 are mounted onto products with operational amplifier of the 78K0/Kx2-L microcontrollers.

The operational amplifiers 0 and 1 have the following modes.

• Single AMP mode (operational amplifiers 0 and 1)

Operational amplifiers 0 and 1 both have two input pins (the AMPn- pin and the AMPn+ pin) and one output pin (the

AMPnOUT pin), and can be used as single-power supply amplifiers that can be externally connected.

The amplified voltage can be used as an analog input of the A/D converter, because the AMPnOUT pin is

alternatively used with analog input pin of the A/D converter.

• PGA (Programmable gain amplifier) mode (operational amplifier 0 only)

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.

Remark Products with operational amplifier of the 78K0/KY2-L and 78K0/KA2-L: n = 0

Products with operational amplifier of the 78K0/KB2-L and 78K0/KC2-L: n = 0, 1