HT45RM03 datasheet(33/54 Pages) HOLTEK

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Application Circuits

Application Circuits 1

The following table shows the C1, C2 and R1 values corresponding to the different crystal values. (For reference only)

Crystal or Resonator

C1, C2

8MHz Crystal

0pF

5.3k

8MHz Resonator

10pF

6.3k

4MHz Crystal

0pF

13k

4MHz Resonator

10pF

12k

3.58MHz Crystal

0pF

15k

3.58MHz Resonator

25pF

10k

2MHz Crystal

25pF

10k

2MHz Resonator

25pF

12k

1MHz Crystal

35pF

15k

480kHz Resonator

300pF, 100pF

9.1k

455kHz Resonator

300pF

10k

429kHz Resonator

300pF

10k

400kHz Resonator

300pF

10k

The function of the resistor R1 is to ensure that the oscillator will switch off should low voltage conditions occur.

Such a low voltage, as mentioned here, is one which is less than the lowest value of the MCU operating volt-

age. Note however that if the LVR is enabled then R1 can be removed.

Note:

The resistance and capacitance for reset circuit should be designed in such a way as to ensure that the VDD is

stable and remains within a valid operating voltage range before bringing RES high.

²*² Make the length of the wiring, which is connected to the RES pin as short as possible, to avoid noise

interference.

HT45RM03

Rev. 1.10

February 16, 2007

R C S y s t e m O s c i l l a t o r

2 4 k W < R O S C < 1 M W

V D D

R O S C

f S Y S / 4

O S C 1

O S C 2

4 7 0 p F

O S C 1

O S C 2

R 1

C 1

C 2

C r y s t a l S y s t e m O s c i l l a t o r

F o r t h e v a l u e s ,

s e e t a b l e b e l o w

O S C C i r c u i t

H T 4 5 R M 0 3

P B 0 / A N 0 ~ P B 1 / A N 1

P B 4 / A N 4 ~ P B 6 / A N 6

P C 0 ~ P C 5

P A 7 / I N T 1

P A 2 / C V I N N

P A 1 / C V I N P

P A 3 / C O U T

P B 7 / A N 7 / T M R 0 / T M R 1

P B 2 / A N 2 / O P O U T

P A 0 / O P I N P

P D 0 / P F D

O S C 1

O S C 2

O S C

C i r c u i t

R E S

0 . 1 m F *

1 0 0 k W

V D D

V S S

0 . 1 m F

V D D

0 . 0 1 m F *

1 0 k W

S e e R i g h t S i d e

M O S F E T

D r i v e r

B L D C

P A 4 / I N T 0 A

P A 5 / I N T 0 B

P A 6 / I N T 0 C

P B 3 / A N 3 / O P I N N

H A L L S e n s o r I n p u t

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