HT45F0057 datasheet(49/88 Pages) HOLTEK

49 / 88 page

Rev. 1.00

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Rev. 1.00

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HT45F0057

Induction Cooker Flash MCU

HT45F0057

Induction Cooker Flash MCU

tADS

A/D sampling time

START

Powe�-on

Reset

A/D �onve�sion time

Reset A/D

�onve�sion

1. Define po�t �onfigu�ation

�. Sele�t analog �hannel

E�CB

A/D sampling time

tADS

PCR9~

PCR1

000000000000B

000000001111B

000000000111B

000000000000B

ACS3~

ACS0

0000B

0010B

0000B

0001B

don’t �a�e

Sta�t of A/D

�onve�sion

Reset A/D

�onve�sion

Sta�t of A/D

�onve�sion

Sta�t of A/D

�onve�sion

End of A/D

�onve�sion

End of A/D

�onve�sion

Reset A/D

�onve�sion

A/D �onve�sion time

End of A/D

�onve�sion

A/D �onve�sion time

tADC

Note: A/D �lo�k must �e fSYS/�� fSYS/8 o� fSYS/3�

tADCS=4tADCK

tADC=16tADCK

Minimum one inst�u�tion �y�le needed� Maximum ten inst�u�tion �y�les allowed.

A/D Conversion Timing

Programming Considerations

When programming, the special attention must be given to the PCR9~PCR1 bits in the PCRH and

PCRL registers. If these bits are all cleared to zero, no external pins will be selected for use as A/D

input pins allowing the pins to be used as normal I/O pins. If the A/D converter is not used, the

internal A/D circuitry should be power down. This may be an important consideration in power

sensitive applications.

A/D Transfer Function

As the device contains a 12-bit A/D converter, its full-scale converted digitised value is equal to

3FFH. Since the full-scale analog input value is equal to the actual A/D converter reference voltage,

VREF, this gives a single bit analog input value of VREF divided by 4096.

1 LSB = VREF ÷ 4096

The A/D Converter input voltage value can be calculated using the following equation:

A/D input voltage = A/D output digital value × VREF ÷ 4096

The diagram shows the ideal transfer function between the analog input value and the digitised

output alue for the A/D converter. Except for the digitised zero value, the subsequent digitised values

will change at a point 0.5 LSB below where they would change without the offset, and the last full

scale digitized value will change at a point 1.5 LSB below the VREF level.

HT45F0057 Datasheet(PDF) 49 Page - Holtek Semiconductor Inc

HT45F0057 Datasheet(HTML) 49 Page - Holtek Semiconductor Inc

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