HT45F43 datasheet(99/152 Pages) HOLTEK

99 / 152 page

The following block diagram illustrates the functional structure for LDO and divided resister.

Operational Amplifiers

There are two fully integrated Operational Amplifiers in the device, OPA1 and OPA2. These OPAs can

be used for signal amplification according to specific user requirements. The OPAs can be disabled or

enabled entirely under software control using internal registers. With specific control registers, some

OPA related applications can be more flexible and easier to be implemented, such as Unit Gain Buffer,

Non-Inverting Amplifier, Inverting Amplifier and various kinds of filters, etc. In addition, the

HT45F23 provides the calibration function to adjust the OPA offset.

Operational Amplifier Registers

The internal Operational Amplifiers are fully under the control of internal registers, OPA1C0,

OPA1C1, OPA2C0, OPA2C1 and OPA2C2. These registers control enable/disable function, input path

selection, gain control, polarity and calibration function.

OPA1C0 Register

- HT45F23

Bit

76543210

Name

A1OP

A1OFM

A1RS

A1OF4

A1OF3

A1OF2

A1OF1

A1OF0

R/W

POR

00010000

Bit 7

A1OP: Operational amplifier output; positive logic. This bit is read only.

Bit 6

A1OFM: Operational amplifier mode or input offset voltage cancellation mode

0: operational amplifier mode

1: input offset voltage cancellation mode

Bit 5

A1RS: Operational amplifier input offset voltage cancellation reference selection bit

0: select A1N as the reference input

1: select A1P as the reference input

Bit 4~0

A1OF4~A1OF0: Operational amplifier input offset voltage cancellation control bits

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

Rev. 1.20

September 15, 2011

HT45F43 датащи(PDF) 99 Page - Holtek Semiconductor Inc

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