HT45F43 datasheet(103/152 Pages) HOLTEK

103 / 152 page

Operational Amplifier Functions

The OPAs are connected together internally in a specific way and the output of OPAs can also be

connected to the internal comparators as shown in the block diagram. Each of the OPAs has its own

control register, with the name OPA1C0, OPA1C1, OPA2C0, OPA2C1 and OPA2C2 which are used to

control the enable/disable function, the calibration procedure and the programmable gain function of

OPA2.

Each of the internal OPAs in the HT45F23 allows for a common mode adjustment method of its input

offset voltage.

The calibration steps are as following:

1. Set A1OFM=1 to setup the offset cancellation mode, here S3C is closed.

2. Set A1RS to select which input pin is to be used as the reference voltage - S1C or S2C is closed

3. Adjust A1OF0~A1OF4 until the output status changes

4. Set A1OFM=0to restore the normal OPA mode

5. Repeat the same procedure from steps 1 to 4 for OPA2

OPA1 Switch Control

The following diagram and table illustrate the OPA1 switch control setting and the corresponding

connections. Note that some switch control selections will force some switches to be controlled by

hardware automatically.

For example:

· The S7C is closed when A1O2CIN=1 and the S7C is opened when A1O2CIN =0.

· The A1PS=1 will force A1PSEL1,0=(00), i.e. S10C,S9C,S8C will be opened.

· When the A1EN=0, S6C switch are opened by hardware, then the related I/O pins can be used as the

other functions.

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

Rev. 1.20

103

September 15, 2011

A 1 R S

A 1 O F M

S 1 C

O N

O F F

O N

S 2 C

O N

O F F

S 3 C

O F F

O N

A 1 O P

A 1 P

A 1 O F 0 ~ A 1 O F 4

A 1 E N

S 1 C

S 2 C

S 3 C

A 1 N

A 1 E

" X " : d o n ' t c a r e

Note:

S1C, S2C and S3C are for HT45F23 only.

A1PS=1 will force A1PSEL1, 0=(0,0), i.e. S10C, S9C, S8C will bw opened.

HT45F43 Datasheet(PDF) 103 Page - Holtek Semiconductor Inc

HT45F43 Datasheet(HTML) 103 Page - Holtek Semiconductor Inc

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