HT45F43 datasheet(110/152 Pages) HOLTEK

110 / 152 page

Comparator Functions

Theses two comparators can operate together with the OPAs or standalone as shown in the main

functional blocks of the OPAs and Comparators.

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

input offset voltage.

The calibration steps are as following:

1. Set C1OFM=1 to setup the offset cancellation mode, here S3A is closed.

2. Set C1RS to select which input pin is to be used as the reference voltage - S1A or S2A is closed

3. Adjust C1OF0~C1OF4 until the output status changes

4. Set C1OFM=0to restore the normal comparator mode

5. Repeat the same procedure from steps 1 to 4 for comparator 2

The following diagram and table illustrate the comparators 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:

· When the CMP1 in calibration mode, i.e. C1OFM =1, then the SW1, SW3 will be forced to close.

The CNPSEL and C1NSEL bits will be set

²1² by hardware, and these two bits will be read out as

²1². After the offset voltage calibration , the CNPSEL and C1NSEL will be back to its original value.

· When the CMP2 in calibration mode, i.e. C2OFM =1, then the SW1, SW2 will be forced to close.

The CNPSEL and C2PSEL bits will be set

²1² by hardware, and these two bits will be read out as

²1². After the offset voltage calibration, the CNPSEL and C2PSEL will be back to its original value.

· If the CNPSEL=1, the A1O2CIN and A2O2CIN will be forced to

²0², i.e. If the SWI is closed, and

that will force S7C and S10D to open.

· If the CNPSEL=0 and the A1O2CIN=1, the A2O2CIN will be forced to

²0², i.e. If the S7C is closed,

and that will force S10D to open.

Rev. 1.20

110

September 15, 2011

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

I O 1 / C 1 N

C 1 O U T E N

I O 5 / C 1 O U T

C M P 1

I O 2 / C N P

C M P 1 O P

C 1 R S

C 1 O F M

S 1 A

O N

O F F

O N

S 2 A

O N

O F F

S 3 A

O F F

O N

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

S 2 A

S 1 A

S 3 A

N o t e : S 1 A , S 2 A a n d S 3 A a r e f o r H T 4 5 F 2 3 o n l y .

HT45F43 Datasheet(PDF) 110 Page - Holtek Semiconductor Inc

HT45F43 Datasheet(HTML) 110 Page - Holtek Semiconductor Inc

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