HT45F23 datasheet(80/152 Pages) HOLTEK

80 / 152 page

A/D Transfer Function

As the devices contain a 12-bit A/D converter, its full-scale converted digitised value is equal to FFFH.

Since the full-scale analog input value is equal to the VDD or VREF voltage, this gives a single bit analog

input value of VDD or VREF divided by 4096.

1 LSB= (VDD or 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

´ (VDD or VREF) ¸ 4096

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

value 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

digitised value will change at a point 1.5 LSB below the VDD or VREF level.

Rev. 1.20

September 15, 2011

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

t A D C

A / D c o n v e r s i o n t i m e

0 0 0 1 1 B

0 0 0 1 0 B

S T A R T

E O C B

A C S 2 ~ A C S 0

P o w e r - o n

R e s e t

E n d o f A / D

c o n v e r s i o n

1 : D e f i n e p o r t c o n f i g u r a t i o n

2 : S e l e c t a n a l o g c h a n n e l

S t a r t o f A / D

c o n v e r s i o n

R e s e t A / D

c o n v e r t e r

A / D s a m p l i n g t i m e

t A D S

0 0 0 0 0 B

S t a r t o f A / D

c o n v e r s i o n

R e s e t A / D

c o n v e r t e r

0 0 0 0 1 B

S t a r t o f A / D

c o n v e r s i o n

R e s e t A / D

c o n v e r t e r

E n d o f A / D

c o n v e r s i o n

A / D s a m p l i n g t i m e

t A D S

o f f

o n

t O N 2 S T

t A D C

A / D c o n v e r s i o n t i m e

o f f

A D O N B

A D C M o d u l e

O N

A/D Conversion Timing

F F E H

(

)

A / D C o n v e r s i o n

R e s u l t

F F F H

F F D H

0 3 H

0 2 H

0 1 H

0 . 5 L S B

4 0 9 3 4 0 9 4 4 0 9 5 4 0 9 6

A n a l o g I n p u t V o l t a g e

1 . 5 L S B

V D D o r V R E F

4 0 9 6

Ideal A/D Transfer Function

HT45F23 датащи(PDF) 80 Page - Holtek Semiconductor Inc

HT45F23 датащи(HTML) 80 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL